CN114553011A - Flyback power supply and charger - Google Patents
Flyback power supply and charger Download PDFInfo
- Publication number
- CN114553011A CN114553011A CN202210448549.1A CN202210448549A CN114553011A CN 114553011 A CN114553011 A CN 114553011A CN 202210448549 A CN202210448549 A CN 202210448549A CN 114553011 A CN114553011 A CN 114553011A
- Authority
- CN
- China
- Prior art keywords
- control circuit
- pin
- power supply
- transformer
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 29
- 230000008054 signal transmission Effects 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 5
- 230000004044 response Effects 0.000 abstract description 8
- 230000000875 corresponding effect Effects 0.000 description 22
- 238000010586 diagram Methods 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000003071 parasitic effect Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the application discloses flyback power supply and charger, flyback power supply includes: the power supply comprises a primary control circuit, a secondary control circuit, a switching tube, a rectifier bridge and a transformer, wherein the rectifier bridge is connected with a first input end of the transformer and is used for being connected with an external power supply; the second input end of the transformer is connected with the switching tube, the first output end of the transformer is grounded, and the second output end of the transformer is connected with the first pin of the secondary control circuit; a first pin and a second pin of the primary control circuit are connected with the switching tube, and a third pin of the primary control circuit is connected with a second pin of the secondary control circuit through a first capacitor; and the third pin of the secondary control circuit is grounded. By adopting the embodiment of the application, the dynamic response of the circuit can be improved, so that the external device and the corresponding loss thereof are reduced, and the timeliness of primary and secondary disconnection protection is improved.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a flyback power supply and a charger.
Background
Currently, electronic devices (such as mobile phones) can be charged by using a USB charger, which converts commercial power into a charging voltage required by the electronic devices based on a switching power supply technology, and a circuit topology adopted in the electronic devices is a flyback power supply (flyback converter). In conventional applications, a control circuit is required for both the primary and the secondary, which performs related signal processing and control respectively, and realizes the normal operation of the whole circuit based on the cooperation of the two. An optical coupling circuit is generally adopted to realize the transmission of a secondary-to-primary feedback signal and ensure the isolation between two stages.
In practical application, due to the fact that the delay of optical coupling transmission and parasitic parallel capacitance affect the bandwidth and stability of the circuit to a certain extent, extra design cost and working loss are increased due to more external devices. Furthermore, the primary control circuit requires additional protection measures to avoid malfunctioning of the circuit when the optocoupler is damaged. Therefore, how to improve the dynamic response of the circuit to reduce the external device and the corresponding loss thereof, and improve the timeliness of the primary and secondary disconnection protection is urgently needed to be solved.
Disclosure of Invention
The embodiment of the application provides a flyback power supply and a charger, which can realize the dynamic response of a circuit, reduce an external device and the corresponding loss thereof, and improve the timeliness of primary and secondary disconnection protection.
In a first aspect, an embodiment of the present application provides a flyback power supply, including: a primary control circuit, a secondary control circuit, a switching tube, a rectifier bridge and a transformer, wherein,
the rectifier bridge is connected with a first input end of the transformer and is used for being connected with an external power supply;
the second input end of the transformer is connected with the switching tube, the first output end of the transformer is grounded, and the second output end of the transformer is connected with the first pin of the secondary control circuit;
a first pin and a second pin of the primary control circuit are connected with the switching tube, and a third pin of the primary control circuit is connected with a second pin of the secondary control circuit through a first capacitor; and the third pin of the secondary control circuit is grounded.
In a second aspect, embodiments of the present application provide a charger including a flyback power supply as described in the first aspect.
The embodiment of the application has the following beneficial effects:
it can be seen that the flyback power supply and the charger described in the embodiments of the present application, wherein the flyback power supply includes: the device comprises a primary control circuit, a secondary control circuit, a switching tube, a rectifier bridge and a transformer, wherein the rectifier bridge is connected with a first input end of the transformer and is used for being connected with an external power supply; the second input end of the transformer is connected with the switching tube, the first output end of the transformer is grounded, and the second output end of the transformer is connected with the first pin of the secondary control circuit; a first pin and a second pin of the primary control circuit are connected with a switching tube, and a third pin of the primary control circuit is connected with a second pin of the secondary control circuit through a first capacitor; the third pin of the secondary control circuit is grounded, so that the dynamic response of the circuit can be improved, the external device and the corresponding loss of the external device are reduced, and the timeliness of primary and secondary disconnection protection is improved.
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 structural diagram of a flyback power supply provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of another flyback power supply provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of a transformer according to an embodiment of the present application;
fig. 4 is a schematic structural diagram between a primary control circuit and a secondary control circuit provided in an embodiment of the present application;
FIG. 5 is a schematic waveform diagram of the present application in normal operation;
fig. 6 is a schematic diagram of another disconnection protection waveform provided in the embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, 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 following describes embodiments of the present application in detail.
Referring to fig. 1 in the related art, fig. 1 is a flyback power supply in the related art, and it can be seen that an input voltage V is formed by an alternating current (AC input) passing through a rectifier bridge 4in. The primary control circuit 1 generates a corresponding PWM control signal based on a current sampling signal on a pin CS and a feedback signal on a pin PFBAnd the switch tube 3 is driven to act through a pin gate. With the action of the switch tube 3, the transformer 5 will input VinFrom the primary winding to the secondary winding. The secondary control circuit 2 obtains the output voltage information V through a pinoAnd combined with an external compensation circuit to generate a corresponding feedback signal. Wherein the feedback signal is transmitted from the secondary to the primary through the optocoupler circuit 6.
Because the optical coupling circuit has larger parasitic capacitance, an extra low-frequency pole is formed, the bandwidth of the whole circuit is influenced, and the difficulty of control design is increased. And certain delay exists in the transmission of the signals, so that the final control effect and stability are further influenced. Meanwhile, when the optical coupler works normally, the resistance R required by the optical coupler and the secondary isb1、Rb2And a primary pull-up resistor RFBEtc. all continue to produce additional losses, reducing the efficiency of the circuit. And more external devices will also increase the corresponding circuit cost. In addition, when the primary and secondary disconnection is caused by the damage of the optical coupler, the primary control circuit needs a corresponding overvoltage protection circuit to avoid the abnormal work of the circuit, but the protection mode needs the output voltage to rise to overvoltage, and the protection mode is deficient in timeliness.
In the related art, the circuit control effect is influenced by the parasitic capacitance of the optical coupler and the transmission delay, extra loss and design cost are increased by more external devices (mainly referring to some electronic components adaptive to the optical coupler), and the protection during disconnection of the primary and secondary is lack of timeliness.
In order to solve the above-mentioned defects, please refer to fig. 2, fig. 2 is a schematic structural diagram of a flyback power supply provided in the embodiment of the present application, and as shown in the drawing, in the embodiment of the present application, a primary and secondary control manner of the flyback power supply is provided, which is intended to improve a loop control effect, reduce an external device and a corresponding loss thereof, and improve timeliness of primary and secondary disconnection protection, specifically as follows:
the flyback power supply includes: a primary control circuit 1, a secondary control circuit 2, a switching tube 3, a rectifier bridge 4 and a transformer 5, wherein,
the rectifier bridge 4 is connected with a first input end of the transformer 5, and the rectifier bridge 4 is used for being connected with an external power supply;
a second input end of the transformer 5 is connected with the switching tube 3, a first output end of the transformer 5 is grounded, and a second output end of the transformer 5 is connected with a first pin Vo of the secondary control circuit 2;
the first pin gate and the second pin CS of the primary control circuit 1 are connected with the switch tube 3, and the third pin PFB of the primary control circuit 1 passes through the first capacitor CFBA second pin SFB connected to the secondary control circuit 2; the third pin of the secondary control circuit 2 is grounded.
To better illustrate the ports of the transformer, the transformer 5 comprises a first input, a second input, a first output and a second output, as shown in fig. 3.
It can be seen that the flyback power supply described in the embodiment of the present application, wherein the flyback power supply includes: the power supply comprises a primary control circuit, a secondary control circuit, a switching tube, a rectifier bridge and a transformer, wherein the rectifier bridge is connected with a first input end of the transformer and is used for being connected with an external power supply; the second input end of the transformer is connected with the switching tube, the first output end of the transformer is grounded, and the second output end of the transformer is connected with the first pin of the secondary control circuit; a first pin and a second pin of the primary control circuit are connected with a switching tube, and a third pin of the primary control circuit is connected with a second pin of the secondary control circuit through a first capacitor; the third pin of the secondary control circuit is grounded, so that the dynamic response of the circuit can be improved, the external device and the corresponding loss of the external device are reduced, and the timeliness of primary and secondary disconnection protection is improved.
In a specific implementation, as shown in fig. 2, fig. 2 shows a primary and secondary control mode of a flyback power supply proposed by the present application. The secondary control circuit 2 samples the output voltage based on the first pin Vo and transmits the compensation signal to the primary control circuit 1 through the second pin SFB. The primary control circuit 1 receives the compensation signal through the third pin PFB, and generates a PWM signal through an internal circuit to control the switching tube 3 to operate.
Alternatively, as shown in fig. 4, the primary control circuit 1 includes: PWM control circuit 10, pulse Receiver (RX) 7, and first pull-down resistor Rp；
The PWM control circuit 10 is connected to the pulse receiver 7 to receive the signal V from the pulse receiver 7COMPP(ii) a The PWM control circuit 10 is used for receiving the voltage signal V input from the second pin CS of the primary control circuit 1CSAnd the PWM control circuit 10 is configured to output a signal to the outside through a first pin gate of the primary control circuit 1;
the primary control circuit is also connected with a second capacitor CYThe third pin of the secondary control circuit 2 is connected, and the pulse receiver 7 is connected to the third pin PFB of the primary control circuit 1.
Optionally, as shown in fig. 4, the secondary control circuit 2 includes: a compensation circuit 11 and a pulse generator (TX) 8; the compensation circuit 11 is connected with the pulse generator 8;
the pulse generator 8 is connected with a second pin SFB of the secondary control circuit 2; and the second pull-down resistor RSAnd (4) grounding.
Optionally, as shown in fig. 4, the compensation circuit 11 includes: comparator gm, first resistor RzAnd a third capacitance Cz；
The output terminal of the comparator gm is connected to the pulse generator 8, and the output terminal of the comparator gm is connected to the first resistor R in sequencezAnd said third capacitance CzGrounding;
the first input (+) of the comparator gm is used for inputting a reference voltage VrefThe second input (-) of the comparator gm is connected to the first pin of the secondary control circuit.
Optionally, the first pull-down resistor RpAnd the second pull-down resistor RSThrough a first capacitor CFBAnd said second capacitance CYThe connection is made.
Optionally, as shown in fig. 4, the first pull-down resistor RpThe second pull-down resistor RSAnd the first capacitor CFBAnd a second capacitor CYForming a feedback signal transmission circuit 9;
the secondary controlThe control circuit 2 is used for sampling a signal Vo and the reference voltage V through the compensation circuit 11 based on voltagerefAnd by said first resistance RzAnd said third capacitance CzThe formed pull-down compensation circuit forms a secondary compensation voltage, and the secondary compensation voltage generates a pulse signal through the pulse generator 8;
the feedback signal transmission circuit 9 is used for feeding back the pulse signal to the primary control circuit 1;
the primary control circuit 1 is configured to receive the pulse signal through the pulse receiver 7, process the pulse signal to obtain a corresponding compensation signal, and generate a corresponding driving signal based on the compensation signal through the PWM control circuit 10 to drive the switching tube 3 to perform a corresponding switching operation.
In a specific implementation, as shown in fig. 4, fig. 4 is a partial schematic diagram of a feedback signal transmission circuit from the pin SFB to the pin PFB. The feedback signal transmission circuit 9 may mainly include a Y capacitor C connected between the pins SFB and PFBFBA Y capacitor C connected between the primary ground and the secondary groundYPin PFB pull-down first pull-down resistor RpPin SFB pull-down second pull-down resistor Rs. In normal operation, the compensation circuit 11 in the secondary control circuit 2 is based on the voltage sampling signal VoAnd a reference voltage VrefAnd a pull-down compensation circuit forms the secondary compensation voltage VCOMPS. Secondary compensation voltage VCOMPSGenerating a corresponding pulse signal S via a pulse generator TX 8fbWidth and V of pulse signalCOMPSAnd (4) correlating. After passing through the feedback signal transmission circuit 9, the corresponding pulse signal V can be detected at the pin PFBfbDetected and processed by a pulse receiver RX 7 in the primary control circuit 1 to generate a corresponding compensation signal VCOMPP. The PWM control circuit 10 then bases on this signal and other related signals (e.g., V)CS) Generating a PWM control signal to drive the switching tube 3 to act.
Optionally, the switch tube 3 passes through a second resistor RCSAnd is grounded.
In the embodiment of the application, a flyback converter is providedThe primary and secondary control modes of the source, the circuit can mainly comprise a primary control circuit, a secondary control circuit and a feedback signal transmission circuit. The primary control circuit receives the feedback pulse signal and generates a power switch control signal; the secondary control circuit generates a feedback pulse signal according to the output signal; the feedback pulse signal is transmitted from the secondary to the primary by the feedback signal transmission circuit. Feedback signal transmission circuit Y capacitor CFB、CYFirst pull-down resistor RpA second pull-down resistor RsAnd (4) forming. Of course, the feedback signal transmission circuit may also include, but is not limited to, a Y capacitor, and may also be in the form of a pulse transformer, a digital optical coupler, and the like. Wherein, Y capacitor CFBY capacitor C connected between primary and secondary signal receiving and transmitting terminalsYConnected between the primary ground and the secondary ground. First pull-down resistor RpA second pull-down resistor RsRespectively at the primary receiving end and the secondary transmitting end.
In one embodiment, the feedback pulse width represents the compensation signal, but is not limited to the pulse width, and may be in the form of pulse level, pulse number, and the like.
Optionally, as shown in fig. 2, the second output terminal of the transformer 5 is connected to the fourth capacitor C through the first diode D1outSaid fourth capacitor CoutThe other end of the first and second electrodes is grounded; the second output terminal of the transformer 5 is further connected to the first pin Vo of the secondary control circuit 2.
Optionally, the second output terminal of the transformer 5 is connected to the first pin of the secondary control circuit through a variable resistor.
Wherein the variable resistor can also be replaced by two different resistors, for example, the two resistors can be a resistor RLResistance RHAnd the voltage division function is realized through the two resistors.
Optionally, the first input end of the transformer 5 passes through a fifth capacitor CinAnd (4) grounding.
Further, specifically, as shown in fig. 5, fig. 5 is VCOMPSTo VCOMPPAnd (5) a waveform schematic diagram. Wherein, TwIs a pulse signal, the pulse signal and a secondaryCompensation signal VCOMPSAnd (4) correlating. It can be seen that VCOMPSHigh then TwLarge, otherwise, then VCOMPSLow then TwIs small. The pulse signal may be used to characterize the compensation signal, the pulse signal may carry pulse parameters, the pulse parameters may include at least one of: pulse width, pulse level, number of pulses, etc., without limitation.
Wherein, TsCan represent a pulse period, as shown in fig. 5, with the switching tube 3 off, the detection VCOMPSAnd generates a corresponding SfbPulse signal of so that TsRelated to the switching frequency (PWM frequency); of course, pulses can also be generated at other moments by acquiring secondary correlated voltage and current signals; t issOr a fixed period.
Further, at SfbAfter generation, the corresponding pulse signal V can be detected at the pin PFB of the primary control circuitfb. As illustrated in the figure, the pulse receiver RX 7 in the primary control circuit receives and detects VfbPulse width of (3), generating a corresponding VCOMPPAnd remain until a new VCOMPPAnd (4) generating. T ismIndicating the time for the pulse receiver to detect the generation of the pulse and the time delay. Obtaining V Primary as illustrated in the figureCOMPPThen, the current signal V obtained by sampling is combined withcsIn combination, the switching tube 3 is controlled.
In the aspect of loop compensation, due to the fact that the influence of the time delay and parasitic capacitance of a traditional optical coupling circuit is avoided, compensation design is simpler, the circuit is integrated in a secondary control circuit more easily, and external devices are further reduced. And the whole circuit can have more margins on the design of system bandwidth, and the dynamic response of the circuit is optimized.
Of course, in terms of loss, the reduction of the operating loss is as high as 7 and 8mW compared with the conventional scheme due to the reduction of the feedback circuit device and the smaller level and pulse width of the feedback pulse signal.
Further, in terms of primary and secondary disconnection protection, as shown in fig. 6, it can be seen from the waveform diagram that the factor C isFBWhen the primary and secondary disconnection is caused by the broken feedback signal transmission circuit and the broken circuit, the primary is at time TPIf the secondary feedback pulse is not detected, the protection signal EN can be directly enabled. Compared with the scheme in the related technology, the protection speed is greatly improved.
The embodiment of the application provides a fly-back power supply's primary, secondary control mode, this method is owing to do not adopt the opto-coupler circuit, and then, need not consider opto-coupler circuit and corresponding external device in circuit design, and then, design cost and working loss have been reduced, in addition, the time delay and the parasitic parallel capacitance that need not care the opto-coupler transmission all influence the bandwidth and the stability of circuit to a certain extent, and then, can promote the dynamic response of circuit, reduce external device and its corresponding loss, promote the timeliness of primary, secondary disconnected antithetical couplet protection.
In addition, the embodiment of the application also provides a charger, and the charger can comprise the flyback power supply described above. Certainly, this charger is owing to including above-mentioned flyback power supply, this charger is owing to do not adopt the opto-coupler circuit, and then, need not consider opto-coupler circuit and corresponding external device in circuit design, and then, design cost and working loss have been reduced, in addition, the time delay and the parasitic parallel capacitance that need not care about the opto-coupler transmission all influence the bandwidth and the stability of circuit to a certain extent, and then, can promote the dynamic response of circuit, reduce external device and corresponding loss, promote the ageing nature of just, the secondary protection of linking absolutely.
The foregoing is an implementation of the embodiments of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the embodiments of the present application, and these modifications and decorations are also regarded as the protection scope of the present application.
Claims (10)
1. A flyback power supply, comprising: a primary control circuit, a secondary control circuit, a switching tube, a rectifier bridge and a transformer, wherein,
the rectifier bridge is connected with a first input end of the transformer and is used for being connected with an external power supply;
the second input end of the transformer is connected with the switching tube, the first output end of the transformer is grounded, and the second output end of the transformer is connected with the first pin of the secondary control circuit;
a first pin and a second pin of the primary control circuit are connected with the switching tube, and a third pin of the primary control circuit is connected with a second pin of the secondary control circuit through a first capacitor; and the third pin of the secondary control circuit is grounded.
2. The flyback power supply of claim 1 wherein the primary control circuit comprises: the Pulse Width Modulation (PWM) control circuit, the pulse receiver and the first pull-down resistor;
the PWM control circuit is connected with the pulse receiver to receive signals transmitted by the pulse receiver; the PWM control circuit is used for receiving a voltage signal input by a second pin of the primary control circuit, and the PWM control circuit is used for outputting a signal outwards through a first pin of the primary control circuit;
the primary control circuit is also connected with a third pin of the secondary control circuit through a second capacitor, and the pulse receiver is connected with the third pin of the primary control circuit.
3. The flyback power supply of claim 2, wherein the secondary control circuit comprises: the compensation circuit, the pulse generator and the second pull-down resistor; the compensation circuit is connected with the pulse generator;
the pulse generator is connected with a second pin of the secondary control circuit; and the pulse generator is grounded through the second pull-down resistor.
4. The flyback power supply of claim 3, wherein the compensation circuit comprises: a comparator, a first resistor and a third capacitor;
the output end of the comparator is connected with the pulse generator, and the output end of the comparator is grounded by being sequentially connected with the first resistor and the third capacitor;
the first input end of the comparator is used for inputting reference voltage, and the second input end of the comparator is connected with the first pin of the secondary control circuit.
5. The flyback power supply of claim 4, wherein the first pull-down resistor is connected to the second pull-down resistor via the first capacitor and the second capacitor.
6. The flyback power supply of claim 5, wherein the first pull-down resistor, the second pull-down resistor, and the first capacitor and the second capacitor form a feedback signal transmission circuit;
the secondary control circuit is used for forming a secondary compensation voltage through the compensation circuit based on a voltage sampling signal, the reference voltage and a pull-down compensation circuit formed by the first resistor and the third capacitor, and then generating a pulse signal through the pulse generator by the secondary compensation voltage;
the feedback signal transmission circuit is used for feeding back the pulse signal to the primary control circuit;
the primary control circuit is used for receiving the pulse signal through the pulse receiver, processing the pulse signal to obtain a corresponding compensation signal, and generating a corresponding driving signal based on the compensation signal through the PWM control circuit so as to drive the switching tube to perform corresponding switching operation.
7. The flyback power supply of any of claims 1-6, wherein the second output of the transformer is connected to one end of a fourth capacitor through a first diode, the other end of the fourth capacitor being connected to ground; the second output end of the transformer is also connected with the first pin of the secondary control circuit.
8. The flyback power supply of any of claims 1-6, wherein the second output of the transformer is coupled to the first pin of the secondary control circuit via a variable resistor.
9. The flyback power supply of any of claims 1-6, wherein the second pin of the primary control circuit is coupled to ground through a second resistor.
10. A charger, characterized in that it comprises a flyback power supply as claimed in any of claims 1-9.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211050778.4A CN116995931A (en) | 2022-04-24 | 2022-04-24 | Flyback power supply and related charger |
| CN202210448549.1A CN114553011B (en) | 2022-04-24 | 2022-04-24 | Flyback power supply and charger |
| PCT/CN2023/087759 WO2023207588A1 (en) | 2022-04-24 | 2023-04-12 | Flyback power supply and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210448549.1A CN114553011B (en) | 2022-04-24 | 2022-04-24 | Flyback power supply and charger |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211050778.4A Division CN116995931A (en) | 2022-04-24 | 2022-04-24 | Flyback power supply and related charger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114553011A true CN114553011A (en) | 2022-05-27 |
| CN114553011B CN114553011B (en) | 2022-07-26 |
Family
ID=81667220
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211050778.4A Pending CN116995931A (en) | 2022-04-24 | 2022-04-24 | Flyback power supply and related charger |
| CN202210448549.1A Active CN114553011B (en) | 2022-04-24 | 2022-04-24 | Flyback power supply and charger |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211050778.4A Pending CN116995931A (en) | 2022-04-24 | 2022-04-24 | Flyback power supply and related charger |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN116995931A (en) |
| WO (1) | WO2023207588A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023207588A1 (en) * | 2022-04-24 | 2023-11-02 | 深圳英集芯科技股份有限公司 | Flyback power supply and charger |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090109711A1 (en) * | 2007-10-26 | 2009-04-30 | Ta-Ching Hsu | Three-pin integrated synchronous rectifier and a flyback synchronous rectifying circuit |
| CN101588131A (en) * | 2009-06-11 | 2009-11-25 | 浙江大学 | Isolated form instead swashs the former limit feedback closed-loop control circuit of current transformer |
| CN107592007A (en) * | 2017-09-21 | 2018-01-16 | 深圳市华星光电技术有限公司 | Inverse-excitation type switch power-supply circuit |
| US20180375437A1 (en) * | 2017-03-31 | 2018-12-27 | Astec International Limited | Switched-Mode Power Supplies Having Burst Mode Operation For Reduced Power Consumption |
| CN112311244A (en) * | 2020-11-05 | 2021-02-02 | 无锡硅动力微电子股份有限公司 | Power conversion control circuit containing integrated high-voltage capacitor isolation communication |
| CN214014114U (en) * | 2020-09-17 | 2021-08-20 | 中国电子科技集团公司第四十三研究所 | Secondary control isolated DC/DC converter circuit topological structure |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6563718B1 (en) * | 2001-12-06 | 2003-05-13 | Koninklijke Philips Electronics N.V. | Capacitively coupled power converter |
| CN106411136A (en) * | 2016-08-25 | 2017-02-15 | 浙江大学 | High-voltage capacitance coupling based control chip of isolated type power converter |
| CN116995931A (en) * | 2022-04-24 | 2023-11-03 | 深圳英集芯科技股份有限公司 | Flyback power supply and related charger |
-
2022
- 2022-04-24 CN CN202211050778.4A patent/CN116995931A/en active Pending
- 2022-04-24 CN CN202210448549.1A patent/CN114553011B/en active Active
-
2023
- 2023-04-12 WO PCT/CN2023/087759 patent/WO2023207588A1/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090109711A1 (en) * | 2007-10-26 | 2009-04-30 | Ta-Ching Hsu | Three-pin integrated synchronous rectifier and a flyback synchronous rectifying circuit |
| CN101588131A (en) * | 2009-06-11 | 2009-11-25 | 浙江大学 | Isolated form instead swashs the former limit feedback closed-loop control circuit of current transformer |
| US20180375437A1 (en) * | 2017-03-31 | 2018-12-27 | Astec International Limited | Switched-Mode Power Supplies Having Burst Mode Operation For Reduced Power Consumption |
| CN107592007A (en) * | 2017-09-21 | 2018-01-16 | 深圳市华星光电技术有限公司 | Inverse-excitation type switch power-supply circuit |
| CN214014114U (en) * | 2020-09-17 | 2021-08-20 | 中国电子科技集团公司第四十三研究所 | Secondary control isolated DC/DC converter circuit topological structure |
| CN112311244A (en) * | 2020-11-05 | 2021-02-02 | 无锡硅动力微电子股份有限公司 | Power conversion control circuit containing integrated high-voltage capacitor isolation communication |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023207588A1 (en) * | 2022-04-24 | 2023-11-02 | 深圳英集芯科技股份有限公司 | Flyback power supply and charger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114553011B (en) | 2022-07-26 |
| CN116995931A (en) | 2023-11-03 |
| WO2023207588A1 (en) | 2023-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10230303B2 (en) | Isolated switching power converter with data communication between primary and secondary sides | |
| CN106341053B (en) | Flyback-based power conversion device | |
| CN105680694B (en) | System and method for switched-mode power supply | |
| US8854842B2 (en) | Digital communication link between secondary side and primary side of switching power converter | |
| US9954455B2 (en) | Constant on time COT control in isolated converter | |
| TW200947179A (en) | Control circuit and method for a flyback power converter | |
| US10270353B2 (en) | Constant on-time (COT) control in isolated converter | |
| US20220376629A1 (en) | Flyback converter and control method thereof | |
| CN114553011B (en) | Flyback power supply and charger | |
| US9929671B2 (en) | Power converter in powered device of power-over-ethernet system and control method thereof | |
| US20220115911A1 (en) | Wireless power transmitting terminal and control method | |
| CN114759809A (en) | Switching power supply and method for use in a switching power supply | |
| CN203660911U (en) | Flyback AC-DC converter | |
| EP3278439B1 (en) | Constant on-time (cot) control in isolated converter | |
| TWI693779B (en) | Switch mode power converter using Hall effect sensor and its method | |
| CN109962621A (en) | Power supply change-over device | |
| TW202341607A (en) | Switching power supply and method for use in switching power supply | |
| US10666155B1 (en) | Synchronous rectification device and method thereof | |
| CN110943622B (en) | Power control circuit, pulse signal detection circuit and pulse signal detection method | |
| JP2017163518A (en) | Pulse isolator employing piezoelectric transformer | |
| KR101979627B1 (en) | Data transfer system inside the converter and the method thereof | |
| CN105576945A (en) | Isolation power supply control device, power supply switching device, and isolation power supply control method thereof | |
| CN218771789U (en) | Magnetic coupling isolation circuit for switching power converter and switching power converter | |
| CN106357100A (en) | Switching power supply capable of increasing response frequency | |
| JP2018007135A (en) | Signal transfer circuit and instrumentation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |