CN115940653A - Valley bottom locking control method of flyback switching power supply and related charger and device - Google Patents

Valley bottom locking control method of flyback switching power supply and related charger and device Download PDF

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Publication number
CN115940653A
CN115940653A CN202211471529.2A CN202211471529A CN115940653A CN 115940653 A CN115940653 A CN 115940653A CN 202211471529 A CN202211471529 A CN 202211471529A CN 115940653 A CN115940653 A CN 115940653A
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valley
peak current
pin
signal
input end
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CN202211471529.2A
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朱况
陈伟
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Shenzhen Injoinic Technology Co Ltd
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Shenzhen Injoinic Technology Co Ltd
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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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

Abstract

The embodiment of the application provides a valley bottom locking control method of a flyback switching power supply, a related charger and a related device, wherein the control device comprises a valley bottom detection module, a valley bottom number counting module, a peak current control module and a PWM (pulse width modulation) logic module; the valley bottom detection module detects valley bottoms in the working process of the converter, the valley bottom number counting module compares and counts peak current reference signals to obtain reference valley numbers, the peak current control module obtains the peak current reference signals according to the feedback voltage and the reference valley numbers, specifically, after the reference valley numbers are changed, the corresponding relation between the peak current reference signals and the feedback voltage is adjusted, and the PWM logic module generates PWM pulses for driving the main power switch tube. According to the embodiment of the application, the valley locking function of the converter is realized, so that the working power of the converter at the valley switching point is approximately equal, and the dynamic performance of the converter is improved.

Description

Valley bottom locking control method of flyback switching power supply and related charger and device
Technical Field
The application relates to the technical field of electronics, in particular to a valley bottom locking control method of a flyback switching power supply, a related charger and a related device.
Background
The flyback switching power supply is also called as a flyback converter, a switching tube of the flyback switching power supply has larger parasitic capacitance, and when the working voltage of the switching tube is higher, the converter has larger switching loss. Therefore, in order to improve the operating efficiency of the converter, the flyback converter generally turns on the resonant valley in the DCM mode, where the voltage across the drain and the source of the switching tube is the minimum, and the switching loss of the switching tube is also reduced to the minimum, and the flyback converter operating in this mode is called a quasi-resonant (QR) flyback converter.
In practical applications, the operating frequency of the switching power supply operating in the QR mode is inversely proportional to the load, and therefore, the prior art generally uses a maximum frequency clamp to limit the operating frequency range of the switching power supply. However, when the number of the converter valley bottoms changes, the relationship between the peak current reference signal and the feedback voltage does not change, so that the peak current reference signal of the converter at the working point of valley bottom number switching does not change, but the working frequency changes suddenly, so that the output power of the converter changes suddenly, and the dynamic performance of the system is influenced; meanwhile, the working power of the flyback converter is discontinuous, the converter jumps between two or even a plurality of valleys, the working frequency of the converter fluctuates greatly, the EMI performance of a system is affected, and audible noise is generated. Therefore, how to implement the valley locking function of the flyback converter is urgently needed to be solved.
Disclosure of Invention
The embodiment of the application provides a valley bottom locking control method of a flyback switching power supply, a related charger and a related device, which can realize the valley bottom locking function of a flyback converter.
In a first aspect, an embodiment of the present application provides a valley locking control device for a flyback switching power supply, where the control device includes: the peak current control module is also connected with the valley bottom number counting module, the valley bottom detection module is connected with a first pin of the control device, the PWM logic module is connected with a second pin and a third pin of the control device, and the peak current control module is connected with a fourth pin of the control device;
the valley bottom detection module is used for detecting the valley bottom in the working process of the converter;
the valley bottom number counting module is used for comparing and counting the peak current reference signals to obtain the reference valley number when the main power switch tube is switched on;
the peak current control module is configured to obtain a peak current reference signal when the main power switching tube is turned off according to a feedback voltage and the reference valley number, specifically, after the reference valley number is changed, adjust a corresponding relationship between the peak current reference signal and the feedback voltage, where the peak current reference signal decreases by an offset when the reference valley number decreases, or the peak current reference signal increases by an offset when the reference valley number increases;
the PWM logic module is used for generating PWM pulses for driving the main power switch tube according to valley signals, the reference valley number, the peak current reference signal and pin voltage signals of the third pin.
In a second aspect, an embodiment of the present application provides a valley lock control method for a flyback switching power supply, which is applied to the valley lock control device for the flyback switching power supply described in the first aspect, and the method includes:
the valley bottom detection module detects valley bottoms in the working process of the converter;
the valley bottom number counting module compares and counts the peak current reference signals to obtain a reference valley value number when the main power switch tube is switched on;
the peak current control module obtains a peak current reference signal when the main power switch tube is turned off according to the feedback voltage and the reference valley number, specifically, after the reference valley number is changed, the peak current reference signal is adjusted to correspond to the feedback voltage, and when the reference valley number is decreased, the peak current reference signal is decreased by an offset, or when the reference valley number is increased, the peak current reference signal is increased by an offset;
the PWM logic module is used for generating PWM pulses for driving the main power switch tube according to valley signals, the reference valley number, the peak current reference signal and pin voltage signals of the third pin.
In a third aspect, embodiments of the present application provide a charger including the control device as described in the first aspect.
The embodiment of the application has the following beneficial effects:
it can be seen that, in the valley bottom locking control method and the related device of the flyback switching power supply described in the embodiment of the present application, the valley bottom detection module detects the valley bottom in the working process of the converter; the valley bottom number counting module compares and counts the peak current reference signals to obtain the reference valley value number when the main power switch tube is switched on; the peak current control module obtains a peak current reference signal when the main power switch tube is turned off according to the feedback voltage and the reference valley number, specifically, after the reference valley number is changed, the corresponding relation between the peak current reference signal and the feedback voltage is adjusted, the peak current reference signal is decreased by an offset when the reference valley number is decreased, or the peak current reference signal is increased by an offset when the reference valley number is increased, and the PWM logic module is used for generating a PWM pulse for driving the main power switch tube according to the valley signal, the reference valley number, the peak current reference signal and a pin voltage signal of the third pin. Therefore, the embodiment of the application not only enables the transmission power between adjacent valley bottoms of the converter to be overlapped to achieve the purpose of locking the valley, but also enables the output power of the converter not to fluctuate violently when the valley bottoms are switched, and improves the dynamic performance of the system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic operating frequency diagram of a frequency clamp control method in the related art according to an embodiment of the present application;
fig. 2 is a graph of a relationship between a peak current signal and a feedback voltage signal in a frequency clamp control method according to an embodiment of the present application;
fig. 3 is a schematic diagram of operating power of a frequency clamp control method in the related art according to an embodiment of the present application;
fig. 4 is a schematic diagram of a valley-locked control device of a flyback switching power supply according to an embodiment of the present disclosure;
fig. 5 is a schematic circuit diagram of another flyback switching power supply system provided in the embodiment of the present application;
fig. 6 is a schematic circuit diagram of another flyback switching power supply system provided in the embodiment of the present application;
fig. 7 is a schematic structural diagram of a valley bottom counting module according to an embodiment of the present disclosure;
FIG. 8 is a graph of a valley number signal versus a feedback voltage signal provided by an embodiment of the present application;
FIG. 9 is a schematic diagram of a peak current control module according to an embodiment of the present disclosure;
FIG. 10 is a graph of a peak current signal versus a feedback voltage signal provided by an embodiment of the present application;
FIG. 11 is a schematic structural diagram of a PWM logic module according to an embodiment of the present disclosure;
FIG. 12 is a schematic diagram of operating power provided by an embodiment of the present application;
fig. 13 is a schematic flowchart of a valley locking control method of a flyback switching power supply according to an embodiment of the present application.
Detailed Description
In order to better understand the technical solutions of the present application, the following description is given for clarity and completeness in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step on the basis of the description of the embodiments of the present application belong to the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, software, product, or apparatus that comprises a list of steps or elements is not limited to those listed but may include other steps or elements not listed or inherent to such process, method, product, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The embodiments of the present application will be described with reference to the drawings, in which a dot at the intersection of intersecting wires indicates that the wires are connected, and a dot-free intersection indicates that the wires are not connected.
In order to better understand the scheme of the embodiments of the present application, the following first introduces the related terms and concepts that may be involved in the embodiments of the present application.
In the related art, in order to solve the above problems,fig. 1 is a schematic diagram of an operating frequency of a conventional frequency clamp control method, fig. 2 is a graph of a relationship between a peak current reference signal and a feedback voltage signal of the conventional control method, and fig. 3 is a schematic diagram of an operating power of the conventional frequency clamp control method. The specific reasons are as follows: if the load is in steady state, the load power is just at the power interruption point, such as P in FIG. 3 1 And at the corresponding power point, the working power of the converter at the first valley bottom is greater than the load power, and the working power of the converter at the second valley bottom is less than the load power, so that the converter can be repeatedly switched under two working states of the first valley bottom and the second valley bottom to enable the output average power to be equal to the load power.
To solve the drawbacks of the related art, please refer to fig. 4, where fig. 4 is a schematic structural diagram of a valley-locked control device of a flyback switching power supply according to an embodiment of the present application, the control device includes: the peak current control module is also connected with the valley bottom number counting module, the valley bottom detection module is connected with a first pin VS of the control device, the PWM logic module is connected with a second pin VG and a third pin CS of the control device, and the peak current control module is connected with a fourth pin FB of the control device;
the valley bottom detection module is used for detecting valley bottoms in the working process of the converter;
the valley bottom number counting module is used for comparing and counting the peak current reference signals to obtain the reference valley number when the main power switch tube is switched on;
the peak current control module is configured to obtain a peak current reference signal when the main power switching tube is turned off according to a feedback voltage and the reference valley number, specifically, after the reference valley number is changed, adjust a corresponding relationship between the peak current reference signal and the feedback voltage, where the peak current reference signal decreases by an offset when the reference valley number decreases, or the peak current reference signal increases by an offset when the reference valley number increases;
and the PWM logic module is used for generating PWM pulses for driving the main power switch tube according to valley bottom signals, the reference valley value number, the peak current reference signals and pin voltage signals of the third pin.
In a specific implementation, the control device may include a valley bottom detection module, a valley bottom number counting module, a peak current control module, and a PWM logic module. The peak current control module obtains a peak current reference signal when the main power switch tube is turned off according to feedback voltage and the reference valley number, specifically, after the reference valley number is changed, the corresponding relation between the peak current reference signal and feedback voltage is adjusted, the peak current reference signal is reduced by an offset when the reference valley number is reduced, or the peak current reference signal is increased by an offset when the reference valley number is increased, and the PWM logic module generates PWM pulses for driving the main power switch tube according to the valley signal, the reference valley number, the peak current reference signal and a CS pin voltage signal.
The comparison value of the peak current reference signal, namely the valley adding reference voltage and the valley reducing reference voltage, is set to have larger hysteresis so that the power between two adjacent valley bottoms is superposed to realize the valley bottom locking of the converter; the increased or decreased offset should make the operating powers of the converters at the valley bottom number switching points approximately equal, that is, the difference between the operating powers of the two is smaller than a preset threshold, the preset threshold may be preset or default to the system, the preset threshold may be close to 0, for example, the preset threshold is 0.1, and for example, the preset threshold is 0.01, that is, the operating power difference between the two is ensured to be as small as possible, so as to improve the dynamic performance of the converter.
In this embodiment of the application, the valley bottom number counting module may include a selector, select corresponding valley adding and valley reducing reference voltages according to the reference valley number through the selector, input the reference voltage into the comparator, compare the peak current reference signal with the valley adding and valley reducing reference voltages, count the comparison result after the switching tube is turned on, and obtain the reference valley number when the main power switching tube is turned on in the next period after counting.
In specific implementation, the converter counts the valley after the main power switch tube is turned off, and the switch tube is turned on only when the counted valley is equal to the reference valley.
Optionally, the first pin VS is used for connecting a converter, the converter includes an auxiliary winding, a primary winding, and a secondary winding, one end of the auxiliary winding is connected to the first pin VS, and the other end is grounded; one end of the primary winding is connected with an external power supply, and the other end of the primary winding is connected with the first end of the main power switch tube Q1; one end of the secondary winding is connected with one end of the diode, and the other end of the secondary winding is grounded; the other end of the diode D1 is connected with the fourth pin FB through a feedback and isolation module;
the PWM logic module is connected with a second end of the main power switch tube Q1 through the second pin VG, and is connected with a third end of the main power switch tube Q1 through the third pin CS and a sampling resistor R sense And is grounded.
As shown in fig. 5, the first pin VS is used for connecting a converter, the converter includes an auxiliary winding, a primary winding, and a secondary winding, one end of the auxiliary winding is connected to the first pin VS, and the other end is grounded; one end of the primary winding is connected with an external power supply, and the other end of the primary winding is connected with the first end of the main power switch tube Q1; one end of the secondary winding is connected with one end of the diode D1, and the other end of the diode D1 is grounded; the other end of the diode D1 is connected with a fourth pin FB through a feedback and isolation module; the PWM logic module is connected with the second end of the main power switch tube Q1 through a second pin VG, and is connected with the third end of the main power switch tube Q1 through a third pin CS and passes through a sampling resistor R sense And is grounded.
In a specific implementation, the current magnitude may be sampled by sampling a voltage of a resistor.
Wherein, one end of the primary winding can also pass through a capacitor (C) in ) The output end of the diode D1 can also pass through a capacitor (C) by being grounded o ) And (4) grounding.
Optionally, the first pin VS is used for connecting the converter, and the converter includes an auxiliary winding, a primary winding, and a secondary winding;
one end of the auxiliary winding is connected with the first pin VS, and the other end of the auxiliary winding is grounded; one end of the primary winding is connected with an external power supply, and the other end of the primary winding is connected with the MOS integrated system; one end of the secondary winding is connected with one end of the diode D1, and the other end of the diode D1 is grounded; the other end of the diode is connected with the fourth pin FB through a feedback and isolation module;
the PWM logic module is connected with the MOS integrated system through the second pin VG and the third pin CS, and the MOS integrated system comprises a main power switch tube.
In a specific implementation, as shown in fig. 6, the first pin VS is used for connecting a converter, and the converter includes an auxiliary winding, a primary winding, and a secondary winding; one end of the auxiliary winding is connected with the first pin VS, and the other end of the auxiliary winding is grounded; one end of the primary winding is connected with an external power supply (V) in ) And the other end is connected with an MOS integrated System (Mosfet System); one end of the secondary winding is connected with one end of the diode D1, and the other end of the diode D1 is grounded; the other end of the diode is connected with a fourth pin FB through a feedback and isolation module; the PWM logic module is connected with an MOS integrated system through a second pin VG and a third pin CS, and the MOS integrated system comprises a main power switch tube.
Wherein, one end of the primary winding can also pass through a capacitor (C) in ) The output end of the diode D1 can also pass through a capacitor (C) by being grounded o ) And (4) grounding.
In specific implementation, the MOS can be integrated into a small system, i.e., a MOS integrated system, and the system can directly output a voltage signal reflecting the magnitude of current without adding a sampling resistor.
In the embodiment of the application, after the peak current reference signals are compared and counted, the reference valley value number when the main power switch tube is switched on is obtained, the peak current reference signal when the main power switch tube is switched off is obtained according to the feedback voltage and the reference valley value number, namely, the relation between the peak current reference signal and the feedback voltage is adjusted under the condition of different reference valley value numbers, so that the transmission power between adjacent valley bottoms of the converter is overlapped, the valley locking purpose is achieved, the output power of the converter cannot fluctuate violently when the valley bottoms are switched, and the dynamic performance of a system is improved.
Optionally, the Valley bottom detecting module is configured to sample a pin voltage of the first pin VS, detect a Valley bottom of the converter during a working process, generate a Valley bottom signal Valley, and transmit the generated Valley bottom signal Valley to the PWM logic module;
the valley bottom number counting module is used for counting the peak current reference signal V cs_ref After comparison and counting, obtaining a reference Valley number Valley _ N when the main power switch tube is switched on, and transmitting the reference Valley number Valley _ N to the peak current control module and the PWM logic module;
the peak current control module is used for controlling the peak current according to the feedback voltage signal V of the fourth pin FB FB And the reference Valley number Valley _ N is used for obtaining the peak current reference signal V when the main power switch tube is turned off cs_ref Specifically, after the reference Valley number Valley _ N is changed, the corresponding relationship between the peak current reference signal and the feedback voltage is adjusted, and when the reference Valley number Valley _ N is decreased, the peak current reference V is determined cs_ref The signal is decreased by an offset, or the peak current reference signal V is increased when the reference Valley number Valley _ N is increased cs_ref Adding an offset to the peak current reference signal V cs_ref Transmitting the number to the valley bottom counting module and the PWM logic module;
the PWM logic module is used for receiving the Valley signal, the reference Valley number Valley _ N when the main power switch tube is switched on, and the peak current reference signal V cs_ref And a pin voltage signal V of the third pin CS cs Generating PWM pulses for driving the main power switch tube, specifically: when the number of the bottom signals is equal to the reference valley value number, the PWM logic module outputs a high level; when the pin voltage signal is greater than the peak current reference signal, the PWM logic module outputs a low level, and a PWM pulse signal is output through the second pin.
In a specific implementation, the valley bottom number counting module is used for counting a peak current reference signal V cs_ref And after comparison and counting, obtaining a reference Valley number Valley _ N when the main power switch tube is switched on, and transmitting the reference Valley number Valley _ N to the peak current control module and the PWM logic module. The peak current control module is used for controlling the peak current according to a feedback voltage signal V of the FB pin FB And the reference Valley number Valley _ N obtains a peak current reference signal V when the main power switch tube is turned off cs_ref Specifically, after the number of reference valleys is changed, the corresponding relationship between the peak current reference signal and the feedback voltage is adjusted, when the number of reference valleys is decreased, the peak current reference signal is decreased by an offset or when the number of reference valleys is increased, the peak current reference signal is increased by an offset, and the peak current reference signal V is adjusted cs_ref And transmitting the number to a valley bottom counting module and a PWM logic module.
The PWM logic module is used for receiving Valley signal Valley, reference Valley number Valley _ N when the main power switch tube is switched on and peak current reference signal V cs_ref And CS Pin Voltage Signal V cs Generating a PWM pulse for driving a main power switch tube, specifically, when the number of the counted valley bottom signals is equal to the reference valley value number, outputting a high level by a PWM logic module; when the voltage signal of the CS pin is larger than the peak current reference signal, the PWM logic module outputs low level, and the PWM pulse signal is output through the VG pin.
Optionally, the valley bottom number counting module includes a first selector, a second selector, a first comparator, a second comparator, an exclusive or gate, and a counter;
the data input end of the first selector is respectively connected with P valley reference voltages, the data input end of the second selector is respectively connected with P valley reference voltages, and P is an integer greater than 1;
the reference valley number is connected to the data selection ends of the first selector and the second selector, the data output ends of the first selector and the second selector are respectively connected to the positive input end of the first comparator and the negative input end of the second comparator, the peak current reference signal is connected to the negative input end of the first comparator and the positive input end of the second comparator, the output end of the first comparator is connected to one input end of the exclusive-or gate and the Add end of the counter, the output end of the second comparator is connected to the other input end of the exclusive-or gate and the Sub end of the counter, the output end of the exclusive-or gate is connected to the enable end of the counter, the clock input end of the counter is connected to the main power switch tube turn-on signal, and the output end of the counter outputs the reference valley number.
The selector selects corresponding valley adding and valley reducing reference voltages according to the reference valley number, the reference voltages are input into the comparator, the peak current reference signals are compared with the valley adding and valley reducing reference voltages to obtain peak current reference signal comparison values, namely comparison results, the comparison results are counted after the main power switch tube is switched on, and the reference valley number when the main power switch tube is switched on in the next period is obtained after the comparison results are counted.
In a specific implementation, as shown in fig. 7, the valley bottom number counting module may include a first selector, a second selector, a first comparator, a second comparator, an exclusive or gate, and a counter. The data input end of the first selector is respectively connected with Valley adding reference voltages a, B, C, D and E, the data input end of the second selector is respectively connected with Valley reducing reference voltages A, B, C, D and E, a reference Valley number Valley _ N is connected with the data selection ends of the first selector and the second selector, the data output ends of the first selector and the second selector are respectively connected with the positive input end of the first comparator and the negative input end of the second comparator, and a peak current reference signal V cs_ref The negative input end of the first comparator is connected with the positive input end of the second comparator, the output end of the first comparator is connected with one input end of the exclusive-OR gate and the Add end of the counter, and the output end of the second comparator is connected with the exclusive-OR gateThe output end of the exclusive-or gate is connected with an enable end EN of the counter, the clock input end of the counter is connected with a main power switch tube opening signal (Drive _ on), and the output end of the counter outputs a reference Valley number (Valley _ N).
In the specific implementation, as shown in fig. 8, it can be seen that the specific working process of the valley bottom number counting module is as follows: the selector selects corresponding valley-adding and valley-reducing reference voltages according to the reference valley number, inputs the reference voltages into the comparator, and outputs a peak current reference signal V cs_ref And comparing with Valley adding and Valley reducing reference voltages, counting comparison results after the main power switch tube is switched on, and obtaining the reference Valley value number Valley _ N when the main power switch tube is switched on in the next period after counting.
Optionally, the peak current control module includes a third selector and a subtractor; the data input end of the third selector is respectively connected with Q reference signals, and Q is an integer greater than 1;
the data selection end of the third selector is connected with the reference valley value number, the output end of the third selector is connected with the negative input end of the subtracter, and the third selector selects the corresponding reference signal according to the reference valley value number and outputs the selected reference signal to the negative input end of the subtracter; the feedback voltage signal is connected with the positive input end of the subtracter and the subtracter outputs the peak current reference signal through a preset proportion link.
As shown in fig. 9, the peak current control module includes a third selector, a subtractor, and a proportional element; the data input ends of the third selectors are respectively connected with the reference signal V ref1 、V ref2 、V ref3 、V ref4 、V ref5 And V ref6 The data selection end of the selector is connected with a reference Valley number Valley _ N, the output end of the selector is connected with the negative input end of the subtracter, and the selector selects a corresponding reference signal according to the reference Valley number Valley _ N and outputs the selected reference signal to the negative input end of the subtracter; feedback voltage signal V FB The positive input end of the subtracter and the output end of the subtracter are connected with a proportion link (1/K) v ) Is inputtedThe output end of the end-to-end proportional link outputs a peak current reference signal V cs_ref 。
In a specific implementation, as shown in fig. 10, the peak current control module specifically works as follows: the selector selects a corresponding reference signal according to the reference Valley number Valley _ N, and a peak current reference signal V can be obtained according to the selected reference signal and a preset proportionality coefficient cs_ref Thus, after the reference valley number is changed, the corresponding relation between the peak current reference signal and the feedback voltage, V, can be adjusted cs_ref Can be obtained by the following formula:
Figure BDA0003958664900000071
wherein V ref A reference voltage selected for the selector.
Optionally, the PWM logic module includes a digital counter, a digital comparator, an and gate, a third comparator, an R/S flip-flop, and a single pulse flip-flop;
the data input end of the digital counter is connected with the valley bottom signal, the reset input end of the digital counter is connected with the main power switch tube opening signal, the digital counter counts the valley bottom quantity of the current period according to the valley bottom signal, and the digital counter is reset when the main power switch tube is opened;
the first input end of the digital comparator is connected with the output end of the digital counter;
the second input end of the digital comparator is connected with the valley bottom number signal, and the digital comparator outputs high level when the first input end is larger than or equal to the second input end; the first input end of the AND gate is connected with the valley bottom signal, and the second input end of the AND gate is connected with the output end of the digital comparator; a positive input end of the third comparator is connected with the pin voltage signal of the third pin, and a negative input end of the third comparator is connected with the peak current reference signal; the set end of the R/S trigger is connected with the output end of the AND gate, and the reset end of the R/S trigger is connected with the output end of the third comparator; the output end of the R/S trigger outputs a driving signal and is connected with the input end of the single pulse trigger, the output end of the single pulse trigger outputs a main power switch tube turn-on signal, when a pin voltage signal of the third pin is larger than the peak current reference signal, the third comparator outputs a high level, the R/S trigger is reset, the driving signal is changed into a low level, when the digital comparator outputs a high level and the valley bottom signal is also a high level, the AND gate outputs a high level, the R/S trigger is set, and the driving signal is changed into a high level.
As shown in fig. 11, the PWM logic module includes a digital counter, a digital comparator, an and gate, a third comparator, an R/S flip-flop, and a single pulse flip-flop; the data input end of the digital counter is connected with a Valley bottom signal Valley, the reset input end of the digital counter is connected with a switching tube on signal Drive _ on, the digital counter counts the Valley bottom number of the current period according to the Valley bottom signal, and the digital counter is reset when the switching tube is on; a first input end of the digital comparator is connected with an output end of the digital counter, a second input end of the digital comparator is connected with the Valley bottom quantity signal Valley _ N, and the digital comparator outputs high level when the first input end is larger than or equal to the second input end; the first input end of the AND gate is connected with the Valley bottom signal Valley, and the second input end of the AND gate is connected with the output end of the digital comparator; the positive input end of the third comparator is connected with a CS pin voltage signal V cs The negative input end of the third comparator is connected with the peak current reference signal V cs_ref (ii) a The output end of the single-pulse trigger outputs a switching tube on signal Drive _ on, and a voltage signal V at a CS pin cs Greater than peak current reference signal V cs_ref When the third comparator outputs a high level, the R/S flip-flop is reset, the Drive signal Drive becomes a low level, and when the digital comparator outputs a high level and the Valley signal Valley is also a high level, the and gate outputs a high level, the R/S flip-flop is set, and the Drive signal Drive becomes a high level.
In specific implementation, the specific working process of the PWM logic module is as follows: the digital counter counts the Valley bottom number of the current period according to the Valley bottom signal, the digital counter is reset when the switch tube is switched on, the digital comparator outputs high level when the Valley bottom number Count _ N counted by the digital counter is more than or equal to the reference Valley value number Valley _ N, and the voltage signal V is output at the CS pin cs Greater than peak current reference signal V cs_ref When the third comparator outputs a high level, the R/S flip-flop is reset, the driving signal Drive becomes a low level, when the digital comparator outputs a high level and the Valley signal Valley is also a high level, the and gate outputs a high level, the R/S flip-flop is set, and the driving signal Drive becomes a high level.
Optionally, the voltage signal of the third pin is a voltage signal reflecting the current of the power loop, and the voltage signal is obtained by sampling voltages at two ends of an external sampling resistor, or is obtained by directly sampling a voltage signal reflecting the current of the power loop.
In specific implementation, in the circuits shown in fig. 5 and 6, after the switching tube is turned on, the current flowing through the switching tube gradually rises, and the current is the power loop current, and the third pin CS samples the current.
Further, as shown in fig. 12, compared with the control method in the related art, the reference valley number when the converter is turned on is obtained by comparing and counting the peak current reference signals, and the comparison value of the peak current reference signals, i.e., the valley-adding reference voltage and the valley-subtracting reference voltage, can be set to have a larger hysteresis, so that the power between two adjacent valley bottoms is overlapped, and thus the valley bottom locking can be realized; meanwhile, after the reference valley number is changed, the relation between the peak current reference signal and the feedback voltage is adjusted, specifically, when the reference valley number is reduced, the peak current reference signal is reduced by an offset or when the reference valley number is increased, the peak current reference signal is increased by an offset, so that the working power of the converter at the valley bottom number switching point is approximately equal, and the dynamic performance of the converter is improved.
In the embodiment of the application, after the peak current reference signals are compared and counted, the reference valley value number when the main power switch tube is switched on is obtained; the corresponding relation between the peak current reference signal and the feedback voltage can be adjusted after the reference valley number is changed, specifically, when the reference valley number is reduced, the peak current reference signal is reduced by an offset or when the reference valley number is increased, the peak current reference signal is increased by an offset, namely, the relation between the peak current reference signal and the feedback voltage is adjusted under the condition of different reference valley numbers, so that the transmission power between adjacent valley bottoms of the converter is overlapped, the valley locking purpose is achieved, the output power of the converter is not severely fluctuated when the valley bottoms are switched, and the dynamic performance of a system is improved.
Please refer to fig. 13, fig. 13 is a schematic flow chart of a valley bottom locking control method of a flyback switching power supply according to an embodiment of the present application, which is applied to the valley bottom locking control device of the flyback switching power supply according to the embodiment of the present application, and includes the following steps:
s1, the valley bottom detection module detects valley bottoms in the working process of the converter;
s2, comparing and counting the peak current reference signals by the valley bottom number counting module to obtain a reference valley number when the main power switch tube is switched on;
s3, the peak current control module obtains a peak current reference signal when the main power switch tube is turned off according to the feedback voltage and the reference valley number, specifically, after the reference valley number is changed, the corresponding relation between the peak current reference signal and the feedback voltage is adjusted, when the reference valley number is reduced, the peak current reference signal is reduced by an offset, or when the reference valley number is increased, the peak current reference signal is increased by an offset;
and S4, the PWM logic module is used for generating PWM pulses for driving the main power switch tube according to valley signals, the reference valley number, the peak current reference signal and the pin voltage signal of the third pin.
For the detailed description of the steps S1 to S4, reference may be made to the corresponding description above, which is not described herein again.
In the embodiment of the present application, a charger may also be provided, which includes the above control device, and the valley bottom locking is realized through the control device, so that the maximum operating frequency of the switching power supply is limited, and the stability of the charger is ensured.
The foregoing is illustrative of embodiments of the present application and it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the embodiments of the present application and are intended to be within the scope of the present application.

Claims (10)

1. A valley locking control device of a flyback switching power supply, the control device comprising: the peak current control circuit is also connected with the valley bottom number counting circuit, the valley bottom detection circuit is connected with a first pin of the control device, the PWM logic circuit is connected with a second pin and a third pin of the control device, and the peak current control circuit is connected with a fourth pin of the control device;
wherein the content of the first and second substances,
the valley bottom detection circuit is used for detecting the valley bottom in the working process of the converter;
the valley bottom number counting circuit is used for comparing and counting the peak current reference signals to obtain the reference valley number when the main power switch tube is switched on;
the peak current control circuit is configured to obtain a peak current reference signal when the main power switching tube is turned off according to the feedback voltage and the reference valley number, and specifically includes: after the reference valley number is changed, adjusting the corresponding relation between the peak current reference signal and the feedback voltage, wherein when the reference valley number is reduced, the peak current reference signal is reduced by an offset, or when the reference valley number is increased, the peak current reference signal is increased by an offset;
and the PWM logic circuit is used for generating PWM pulses for driving the main power switch tube according to valley bottom signals, the reference valley value number, the peak current reference signals and pin voltage signals of the third pin.
2. The apparatus of claim 1, wherein the first pin is configured to connect to the converter, the converter comprises an auxiliary winding, a primary winding, and a secondary winding, one end of the auxiliary winding is connected to the first pin, and the other end of the auxiliary winding is connected to ground; one end of the primary winding is connected with an external power supply, and the other end of the primary winding is connected with the first end of the main power switching tube; one end of the secondary winding is connected with one end of the diode, and the other end of the diode is grounded; the other end of the diode is connected with the fourth pin through a feedback and isolation circuit;
the PWM logic circuit is connected with the second end of the main power switch tube through the second pin, and the PWM logic circuit is connected with the third end of the main power switch tube through the third pin and is grounded through the sampling resistor.
3. The apparatus of claim 1, wherein the first pin is configured to connect to the converter, the converter comprising an auxiliary winding, a primary winding, and a secondary winding;
one end of the auxiliary winding is connected with the first pin, and the other end of the auxiliary winding is grounded; one end of the primary winding is connected with an external power supply, and the other end of the primary winding is connected with the MOS integrated system; one end of the secondary winding is connected with one end of the diode, and the other end of the secondary winding is grounded; the other end of the diode is connected with the fourth pin through a feedback and isolation circuit;
the PWM logic circuit is connected with the MOS integrated system through the second pin and the third pin, and the MOS integrated system comprises a main power switch tube.
4. The apparatus according to any one of claims 1 to 3,
the valley bottom detection circuit is used for sampling the pin voltage of the first pin, detecting the valley bottom of the converter in the working process, generating a valley bottom signal and transmitting the generated valley bottom signal to the PWM logic circuit;
the valley bottom number counting circuit is used for comparing and counting the peak current reference signals to obtain the reference valley number when the main power switch tube is switched on, and transmitting the reference valley number to the peak current control circuit and the PWM logic circuit;
the peak current control circuit is configured to obtain a peak current reference signal when the main power switching tube is turned off according to a feedback voltage signal of the fourth pin and the reference valley number, specifically, after the reference valley number is changed, adjust a corresponding relationship between the peak current reference signal and the feedback voltage, where the peak current reference signal decreases by an offset when the reference valley number decreases, or the peak current reference signal increases by an offset when the reference valley number increases, and transmit the peak current reference signal to the valley bottom number counting circuit and the PWM logic circuit;
the PWM logic circuit is configured to generate a PWM pulse for driving the main power switch tube according to the valley signal, the reference valley number when the main power switch tube is turned on, the peak current reference signal, and the pin voltage signal of the third pin, and specifically includes: when the number of the bottom signals is counted to be equal to the reference valley value number, the PWM logic circuit outputs a high level; when the pin voltage signal is greater than the peak current reference signal, the PWM logic circuit outputs a low level, and a PWM pulse signal is output through the second pin.
5. The apparatus of claim 4, wherein the valley number counting circuit comprises a first selector, a second selector, a first comparator, a second comparator, an exclusive OR gate, and a counter;
the data input end of the first selector is respectively connected with P valley adding reference voltages, the data input end of the second selector is respectively connected with P valley subtracting reference voltages, and P is an integer greater than 1;
the reference valley number is connected to the data selection ends of the first selector and the second selector, the data output ends of the first selector and the second selector are respectively connected to the positive input end of the first comparator and the negative input end of the second comparator, the peak current reference signal is connected to the negative input end of the first comparator and the positive input end of the second comparator, the output end of the first comparator is connected to one input end of the exclusive-or gate and the Add end of the counter, the output end of the second comparator is connected to the other input end of the exclusive-or gate and the Sub end of the counter, the output end of the exclusive-or gate is connected to the enable end of the counter, the clock input end of the counter is connected to the turn-on signal of the main power switch tube, and the output end of the counter outputs the reference valley number.
6. The apparatus of claim 4, wherein the peak current control circuit comprises a third selector, a subtractor; the data input end of the third selector is respectively connected with Q reference signals, and Q is an integer greater than 1;
the data selection end of the third selector is connected with the reference valley value number, the output end of the third selector is connected with the negative input end of the subtracter, and the third selector selects the corresponding reference signal according to the reference valley value number and outputs the selected reference signal to the negative input end of the subtracter; the feedback voltage signal is connected with the positive input end of the subtracter and the subtracter outputs the peak current reference signal through a preset proportion link.
7. The apparatus of claim 4, wherein the PWM logic circuit comprises a digital counter, a digital comparator, an AND gate, a third comparator, an R/S flip-flop, and a one-pulse flip-flop;
the data input end of the digital counter is connected with the valley bottom signal, the reset input end of the digital counter is connected with a switching-on signal of the main power switch tube, the digital counter counts the valley bottom quantity of the current period according to the valley bottom signal, and the digital counter is reset when the main power switch tube is switched on;
the first input end of the digital comparator is connected with the output end of the digital counter;
the second input end of the digital comparator is connected with the reference valley value number, and the digital comparator outputs high level when the first input end is greater than or equal to the second input end; the first input end of the AND gate is connected with the valley bottom signal, and the second input end of the AND gate is connected with the output end of the digital comparator; the positive input end of the third comparator is connected with the pin voltage signal of the third pin, and the negative input end of the third comparator is connected with the peak current reference signal; the set end of the R/S trigger is connected with the output end of the AND gate, and the reset end of the R/S trigger is connected with the output end of the third comparator; the output end of the R/S trigger outputs a driving signal and is connected with the input end of the single pulse trigger, the output end of the single pulse trigger outputs a main power switch tube turn-on signal, when a pin voltage signal of the third pin is larger than the peak current reference signal, the third comparator outputs a high level, the R/S trigger is reset, the driving signal is changed into a low level, when the digital comparator outputs a high level and the valley bottom signal is also a high level, the AND gate outputs a high level, the R/S trigger is set, and the driving signal is changed into a high level.
8. The apparatus of claim 4, wherein the pin voltage signal of the third pin comprises a voltage signal reflecting the current level of the power loop, and the voltage signal is obtained by sampling a voltage across an external sampling resistor or directly sampling the voltage signal reflecting the current level of the power loop.
9. A valley lock control method for a flyback switching power supply, applied to the apparatus as claimed in any one of claims 1 to 8, the method comprising:
the valley bottom detection circuit detects the valley bottom of the converter in the working process;
the valley bottom number counting circuit compares and counts the peak current reference signals to obtain the reference valley value number when the main power switch tube is switched on;
the peak current control circuit obtains a peak current reference signal when the main power switch tube is turned off according to a feedback voltage and the reference valley number, specifically, after the reference valley number is changed, the corresponding relation between the peak current reference signal and the feedback voltage is adjusted, when the reference valley number is reduced, the peak current reference signal is reduced by an offset, or when the reference valley number is increased, the peak current reference signal is increased by an offset;
and the PWM logic circuit is used for generating PWM pulses for driving the main power switch tube according to valley bottom signals, the reference valley value number, the peak current reference signals and pin voltage signals of the third pin.
10. A charger, characterized in that it comprises a control device according to any one of claims 1-8.
CN202211471529.2A 2022-08-19 2022-08-19 Valley bottom locking control method of flyback switching power supply and related charger and device Pending CN115940653A (en)

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