CN110611434A - Flyback switching power supply and feedback unit thereof, feedback unit chip and manufacturing method thereof - Google Patents
Flyback switching power supply and feedback unit thereof, feedback unit chip and manufacturing method thereof Download PDFInfo
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- CN110611434A CN110611434A CN201911020078.9A CN201911020078A CN110611434A CN 110611434 A CN110611434 A CN 110611434A CN 201911020078 A CN201911020078 A CN 201911020078A CN 110611434 A CN110611434 A CN 110611434A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a flyback switching power supply and a feedback unit thereof, a feedback unit chip and a manufacturing method thereof, wherein the flyback switching power supply comprises an alternating current input end, a transformer primary winding, a transformer secondary winding, a primary switching tube, a direct current output end and a feedback unit; the feedback unit comprises a differential pressure frequency conversion circuit, a capacitor C1, a capacitor C2, a frequency discrimination circuit and a control circuit; the voltage difference frequency conversion circuit comprises a voltage comparison circuit and a voltage-controlled oscillator, wherein the input end of the voltage comparison circuit is connected with the secondary side voltage, the positive electrode and the negative electrode of the output end of the voltage-controlled oscillator are respectively connected with the input end of the frequency discrimination circuit through a capacitor C1 and a capacitor C2, the output end of the frequency discrimination circuit is connected with the input end of the control circuit, and the control circuit is used for outputting a feedback control signal to control the primary side switching tube according to the signal output by the frequency discrimination circuit. The invention reduces the volume of the flyback switching power supply, improves the integration level and reduces the manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of circuit structures, and particularly relates to a flyback switching power supply, a feedback unit of the flyback switching power supply, a feedback unit chip and a manufacturing method of the feedback unit chip.
Background
Compared with the traditional power supply, the flyback switching power supply has the characteristics of simple structure, good stability and low cost, so that the flyback switching power supply is gradually applied to various products such as mobile phone chargers and power adapters.
The flyback switching power supply makes the output voltage approach the target voltage by negative feedback regulation. In the negative feedback link, the voltage at the low-voltage side is collected and then compared with the comparison voltage, and the difference signal obtained by comparison is transmitted to the control chip at the high-voltage side to control the duty ratio of the switch so as to regulate the output voltage. In this in-process, need keep apart between high-pressure side and the low pressure side, the common use opto-coupler of prior art keeps apart, but the opto-coupler is an independent device, can't integrate in the chip, consequently leads to flyback switching power supply's volume to reduce again hardly, and the integrated level is high inadequately.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problem that the size of a flyback switching power supply is difficult to reduce due to the fact that an optical coupler is used for isolation in the prior art, the invention provides a flyback switching power supply and a feedback unit thereof.
The invention also aims to provide a feedback unit chip of the flyback switching power supply and a manufacturing method thereof.
The technical scheme is as follows: a feedback unit of a flyback switching power supply comprises a voltage difference frequency conversion circuit, a capacitor C1, a capacitor C2, a frequency discrimination circuit and a control circuit; the voltage difference frequency conversion circuit comprises a voltage comparison circuit and a voltage-controlled oscillator, the voltage comparison circuit comprises a signal input end and a target voltage setting end, the target voltage setting end is used for inputting a target voltage signal, the signal input end is connected with a secondary side of a transformer of the flyback switching power supply, the output end of the voltage comparison circuit is connected with the input end of the voltage-controlled oscillator, the positive pole and the negative pole of the output end of the voltage-controlled oscillator are respectively connected with the input end of the frequency discrimination circuit through a capacitor C1 and a capacitor C2, the output end of the frequency discrimination circuit is connected with the input end of the control circuit, the control circuit is used for outputting a feedback control signal according to the signal output by the frequency discrimination circuit, and the feedback.
Further, the voltage comparison circuit further comprises a target voltage setting module, wherein the target voltage setting end is connected with the target voltage setting module, and the target voltage setting module is used for setting corresponding target voltage according to fixed conditions or external signals.
Further, the target voltage setting module comprises a USB PD module or a QC module, and the target voltage is set through a USB PD protocol or a DQ protocol.
Further, the frequency discrimination circuit comprises a differential conversion single amplifier, a monostable trigger and a charge pump, wherein the differential conversion single amplifier is used for converting differential signals transmitted by a capacitor C1 and a capacitor C2 into single-ended signals, the single-ended signals are input from an input end of the monostable trigger, an output end of the monostable trigger is connected with the charge pump, and the output of the charge pump is an output signal of the frequency discrimination circuit.
Further, the differential single-amplifier comprises a bias current source, a first P-type MOS transistor, a second P-type MOS transistor, a first N-type MOS transistor and a second N-type MOS transistor, wherein the gates of the first P-type MOS transistor and the second P-type MOS transistor are respectively connected with a capacitor C1 and a capacitor C2; the source electrodes of the first P-type MOS tube and the second P-type MOS tube are connected with a bias current source; the drain electrode of the first P-type MOS tube is connected with the drain electrode of the first N-type MOS tube, the drain electrode of the second P-type MOS tube is connected with the drain electrode of the second N-type MOS tube, and the source electrode of the first N-type MOS tube and the source electrode of the second N-type MOS tube are both connected with a power supply; the grid electrode of the first N-type MOS tube is connected with the grid electrode of the second N-type MOS tube, the grid electrode of the first N-type MOS tube is connected with the drain electrode, and the grid electrode output of the second N-type MOS tube is a single-ended signal.
A flyback switching power supply adopting a feedback unit of the flyback switching power supply comprises an alternating current input end, a primary winding of a transformer, a secondary winding of the transformer, a primary switching tube, a direct current output end and the feedback unit, wherein the alternating current input end is connected with the primary winding of the transformer; the primary side switching tube is connected in series with the primary side winding of the transformer and is used for controlling the on-off of the primary side winding of the transformer; the direct current output end is connected with the secondary winding of the transformer; the feedback unit is connected with the direct current output end and used for collecting the voltage of the direct current output end and controlling the on-off of the primary side switching tube.
A feedback unit chip of a flyback switching power supply at least comprises a first die and a second die which are sealed, a frequency discrimination circuit, a capacitor C1 and a capacitor C2 are integrated in the first die, and a differential pressure frequency conversion circuit is integrated in the second die; the positive input end and the negative input end of the frequency discrimination circuit are respectively connected with one end of a capacitor C1 and one end of a capacitor C2, the other ends of the capacitor C1 and the capacitor C2 are connected with a pressure welding point of a first bare chip, the output end of the differential pressure frequency conversion circuit is connected with a pressure welding point of a second bare chip, and the pressure welding point of the first bare chip and the pressure welding point of the second bare chip are connected through at least two in-chip leads.
The control circuit and the primary side switch tube are integrated in the third die, and the third die is connected with the first die through an on-chip lead.
Further, a control circuit is integrated in the first die, and the control circuit is connected with the frequency discrimination circuit.
The chip further comprises a primary side switch tube, the first bare chip and the second bare chip are sealed in the chip together, and the primary side switch tube is connected with the first bare chip through an inner lead of the chip; or the primary side switching tube is also integrated in the first die.
A manufacturing method of a feedback unit chip of a flyback switching power supply comprises the following steps:
(a1) manufacturing a first bare chip, wherein the first bare chip comprises a frequency discrimination circuit, a capacitor C1 and a capacitor C2; manufacturing a second die, wherein the second die comprises a differential pressure frequency conversion circuit;
(b1) connecting the pressure welding points of the first bare chip and the second bare chip by using an inner chip lead;
(c1) and the first die and the second die are encapsulated into a chip.
Further, in the step (a1), the capacitors C1 and C2 are formed by using an ultra-thick interlayer isolation process.
Further, the first die in step (a1) further includes a control circuit and a primary side switching tube.
Further, the first die in step (a1) further includes control circuitry; step (c1) further comprises: and the primary side switch tube, the first bare chip and the second bare chip are packaged into a chip.
Has the advantages that: compared with the prior art, the flyback switching power supply and the feedback unit thereof have the advantages that the feedback unit replaces an optical coupler with the capacitor, the voltage signal collected by the output end is converted into the frequency signal, the frequency signal is transmitted through the capacitor, and then the frequency signal is converted into the voltage or current signal, so that the transmission of the feedback signal is realized, the capacitor can play an isolation role, and can be integrated in a chip together with other circuits, so that the integration level of the flyback switching power supply is improved, the size is reduced, and the cost is reduced.
Compared with the prior art, the feedback power supply chip of the flyback switching power supply and the manufacturing method thereof provided by the invention have the advantages that the feedback unit can be integrated by only one chip or two chips finally, and a capacitor device is not required to be additionally added, so that the volume of a product is greatly reduced, the manufacturing steps are reduced, the manufacturing speed is increased, and the production and manufacturing cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a flyback switching power supply;
FIG. 2 is a schematic structural diagram of a feedback unit;
FIG. 3 is a circuit schematic of a differential to single amplifier;
fig. 4 is a schematic diagram of an internal structure of a feedback unit chip according to a first embodiment;
fig. 5 is a schematic diagram of an internal structure of a feedback unit chip according to a second embodiment.
Detailed Description
The invention is further explained below with reference to the figures and the specific embodiments.
The first embodiment is as follows:
as shown in fig. 1, a flyback switching power supply includes an ac input terminal 101, a primary winding 102 of a transformer, a secondary winding 103 of the transformer, a primary switching tube 105, a dc output terminal 104, and a feedback unit 106, where the ac input terminal 101 is connected to the primary winding 102 of the transformer; the primary side switching tube 105 is connected in series with the primary side winding 102 of the transformer and is used for controlling the on-off of the primary side winding 102 of the transformer; the direct current output end 104 is connected with the secondary winding 103 of the transformer; the feedback unit 106 is connected to the dc output terminal 104, and is configured to collect a voltage at the dc output terminal 104 and drive the primary side switching tube 105 to be turned on.
The feedback unit 106 includes a differential frequency conversion circuit 110, a capacitor C1, a capacitor C2, a frequency discriminator 108 and a control circuit 109; the voltage difference frequency conversion circuit comprises a voltage comparison circuit and a voltage-controlled oscillator 107, the voltage comparison circuit comprises a signal input end and a target voltage setting end, the target voltage setting end is used for inputting a target voltage signal, the target voltage setting end is connected with a target voltage setting module, the target voltage setting module comprises a USB PD module or a QC module, the target voltage setting is completed through a USB PD protocol or a QC protocol, the corresponding target voltage is set according to the external signal, and other communication modules or even self-defined communication protocol modules can be used for acquiring the external signal, according to actual needs, the corresponding target voltage can be automatically set according to fixed conditions through the target voltage setting module, or the target voltage is directly input from the target voltage setting end, or a certain target voltage value is fixedly set at the target voltage setting end; the signal input end is connected with a secondary winding 103 of a transformer of the flyback switching power supply, the output end of the voltage comparison circuit is connected with the input end of the voltage-controlled oscillator, and the voltage comparison circuit is used for comparing the secondary voltage of the flyback switching power supply with a target voltage to obtain a voltage difference. The positive and negative electrodes of the output end of the voltage-controlled oscillator 107 are respectively connected with the input end of the frequency discrimination circuit 108 through a capacitor C1 and a capacitor C2, because the positive and negative signals output by the voltage-controlled oscillator 107 are reverse signals, two capacitors are needed, and each wire is connected with one capacitor, so that the transmission of frequency signals is realized; the output end of the frequency discrimination circuit 108 is connected to the input end of the control circuit 109, the control circuit 109 is configured to output a feedback control signal according to a signal output by the frequency discrimination circuit 108 to control the on/off of the primary side switching tube 105, and the frequency discrimination circuit 108 may output a voltage signal or a current signal according to actual conditions.
The feedback unit 106 continuously adjusts the conduction duty ratio of the primary side switching tube according to the comparison between the acquired voltage of the secondary side output end of the transformer and the target voltage, so that the voltage of the output end tends to the target voltage. However, since the transformer has a high voltage on one side and a low voltage on the other side, the voltage signal cannot be directly transmitted and must be isolated. In the embodiment, a differential voltage signal required by feedback is converted into a frequency signal through the voltage-controlled oscillator, and the frequency signal is transmitted through the capacitor C1 and the capacitor C2, where the capacitor C1 and the capacitor C2 not only play a role of transmitting the feedback signal, but also play an isolation role of isolating a low-voltage side from a high-voltage side, the capacitor C1 and the capacitor C2 transmit the frequency signal to the high-voltage side, and the frequency signal is converted into a voltage or current signal through the frequency discrimination circuit 108.
As shown in fig. 2, the frequency discrimination circuit 108 includes a differential single amplifier, a monostable flip-flop, and a charge pump, where the differential single amplifier is used to convert the differential signal transmitted by the capacitors C1 and C2 into a single-ended signal, the single-ended signal is input from an input terminal of the monostable flip-flop, an output terminal of the monostable flip-flop is connected to the charge pump, an output of the charge pump is an output signal of the frequency discrimination circuit 108, the frequency discrimination circuit 108 in this embodiment outputs a voltage signal, and if a current signal needs to be output to the control circuit 109, a voltage-current conversion circuit is added behind the charge pump. The frequency discriminator circuit 108 may also be implemented with other circuits that convert frequency into a voltage or current signal, and may function in the same way.
The differential single-stage amplifier Is configured to convert a differential signal into a single-ended signal, and as shown in fig. 3, the differential single-stage amplifier includes a bias current source Is, a first P-type MOS transistor M1, a second P-type MOS transistor M2, a first N-type MOS transistor M3, and a second N-type MOS transistor M4, where gates of the first P-type MOS transistor M1 and the second P-type MOS transistor M2 are respectively connected to a capacitor C1 and a capacitor C2; the sources of the first P-type MOS transistor M1 and the second P-type MOS transistor M2 are both connected with a bias current source Is; the drain electrode of the first P-type MOS tube M1 is connected with the drain electrode of the first N-type MOS tube M3, the drain electrode of the second P-type MOS tube M2 is connected with the drain electrode of the second N-type MOS tube M4, and the source electrode of the first N-type MOS tube M3 and the source electrode of the second N-type MOS tube M4 are both connected with a power supply; the grid electrode of the first N-type MOS tube M3 is connected with the grid electrode of the second N-type MOS tube M4, the grid electrode of the first N-type MOS tube M3 is connected with the drain electrode, and the grid electrode output of the second N-type MOS tube M4 is a single-ended signal.
The single-ended signal passes through the monostable trigger, and the monostable trigger output controls the charge pump to charge and discharge the capacitor, and when the charge and discharge on the capacitor keep balance, the voltage keeps stable.
In the practical production and manufacture of the flyback switching power supply chip, in order to reduce the product volume and reduce the cost as much as possible, the capacitor C1 and the capacitor C2 need to be integrated with other circuits, and because the voltage resistance of the common integrated capacitor is not high enough, the embodiment is realized by adopting an ultra-thick interlayer isolation process of upper and lower electrode plates, and the high voltage resistance of the capacitor is ensured. In addition, in consideration of cost and area, the capacitance values of the capacitor C1 and the capacitor C2 are usually very small, much smaller than 10pf, which results in that the signal on the capacitor must be very weak and interfered, and in consideration of performance requirements, the capacitor C1, the capacitor C2 and the frequency discriminator circuit are integrated on a single die during the manufacturing process of the chip.
The feedback unit chip of the flyback switching power supply, as shown in fig. 4, includes at least a first die 201 and a second die 202, the frequency discriminator circuit 108, the capacitor C1, and the capacitor C2 are integrated in the first die 201, and the differential-pressure frequency converter circuit 110 is integrated in the second die 202. The control circuit part is separately sealed into a chip, and the chip is connected with the chip through an external lead of the chip when in use. The positive input end and the negative input end of the frequency discrimination circuit 108 are respectively connected with one end of a capacitor C1 and one end of a capacitor C2, the other ends of the capacitor C1 and the capacitor C2 are connected with a pressure welding point of a first bare chip, the output end of the differential pressure frequency conversion circuit 110 is connected with a pressure welding point of a second bare chip, the pressure welding point of the first bare chip is connected with the pressure welding point of the second bare chip through an in-chip lead 203, and the first bare chip 201 is connected with the second bare chip 202 through at least two in-chip leads. In addition, the first die 201 and the second die 202 need to be isolated from each other, so that the isolation function of the high-voltage side and the low-voltage side can be achieved.
In addition, when the control circuit 109 is separately packaged into a chip, it may be integrated with the primary side switching tube 105 of the flyback switching power supply, or may not be integrated with the primary side switching tube 105.
The manufacturing method of the feedback unit chip of the flyback switching power supply comprises the following steps:
(a1) manufacturing a first bare chip, wherein the first bare chip comprises a frequency discrimination circuit, a capacitor C1 and a capacitor C2, and the capacitor C1 and the capacitor C2 are manufactured by adopting an ultra-thick interlayer isolation process; manufacturing a second die, wherein the second die comprises a differential pressure frequency conversion circuit;
(b1) connecting the pressure welding points of the first bare chip and the second bare chip by using an inner chip lead;
(c1) and the first die and the second die are encapsulated into a chip.
Example two:
embodiment two is the same as embodiment one except that the control circuit 109 is also integrated in the first die. The primary side switch tube 105 may be integrated with the control circuit in the first die, or may be packaged together with the first die and the second die into a chip.
As shown in fig. 5, the control circuit 109 and the frequency discriminator circuit 108, the capacitor C1, and the capacitor C2 are integrated together on the first die 301, and are encapsulated in a chip with the second die 302. When the control circuit 109 is integrated in the first die 301, the output terminal of the frequency discriminator 108 is connected to the input terminal of the control circuit 109, and the control circuit 109 is configured to receive the voltage signal output by the frequency discriminator 108 and output the feedback control signal.
The manufacturing method of the feedback unit chip of the flyback switching power supply comprises the following steps:
(a2) manufacturing a first bare chip, wherein the first bare chip comprises a control circuit, a frequency discrimination circuit, a capacitor C1 and a capacitor C2, and the capacitor C1 and the capacitor C2 are manufactured by adopting an ultra-thick interlayer isolation process; manufacturing a second die, wherein the second die comprises a differential pressure frequency conversion circuit;
(b2) connecting the pressure welding points of the first bare chip and the second bare chip by using an inner chip lead;
(c2) and the first die and the second die are encapsulated into a chip.
The primary side switch tube may be integrated with the control circuit in the first die in step (a2), or the evolution switch, the first die, and the second die may be packaged into a chip in step (c 2).
Claims (14)
1. A feedback unit of a flyback switching power supply is characterized by comprising a voltage difference frequency conversion circuit, a capacitor C1, a capacitor C2, a frequency discrimination circuit and a control circuit; the voltage difference frequency conversion circuit comprises a voltage comparison circuit and a voltage-controlled oscillator, the voltage comparison circuit comprises a signal input end and a target voltage setting end, the target voltage setting end is used for inputting a target voltage signal, the signal input end is connected with a secondary side of a transformer of the flyback switching power supply, the output end of the voltage comparison circuit is connected with the input end of the voltage-controlled oscillator, the positive pole and the negative pole of the output end of the voltage-controlled oscillator are respectively connected with the input end of the frequency discrimination circuit through a capacitor C1 and a capacitor C2, the output end of the frequency discrimination circuit is connected with the input end of the control circuit, the control circuit is used for outputting a feedback control signal according to the signal output by the frequency discrimination circuit, and the feedback.
2. The feedback unit of the flyback switching power supply of claim 1, wherein the voltage comparison circuit further comprises a target voltage setting module, the target voltage setting terminal is connected to the target voltage setting module, and the target voltage setting module is configured to set a corresponding target voltage according to a fixed condition or an external signal.
3. The feedback unit of the flyback switching power supply of claim 2, wherein the target voltage setting module comprises a USB PD module or a QC module, and the setting of the target voltage is implemented by a USB PD protocol or a QC protocol.
4. The feedback unit of the flyback switching power supply as claimed in claim 1, wherein the frequency discriminator circuit comprises a differential single amplifier, a monostable flip-flop and a charge pump, the differential single amplifier is configured to convert the differential signal transmitted by the capacitor C1 and the capacitor C2 into a single-ended signal, the single-ended signal is input from an input terminal of the monostable flip-flop, an output terminal of the monostable flip-flop is connected to the charge pump, and an output of the charge pump is an output signal of the frequency discriminator circuit.
5. The feedback unit of the flyback switching power supply of claim 4, wherein the differential single amplifier comprises a bias current source, a first P-type MOS transistor, a second P-type MOS transistor, a first N-type MOS transistor, and a second N-type MOS transistor, and gates of the first P-type MOS transistor and the second P-type MOS transistor are respectively connected to a capacitor C1 and a capacitor C2; the source electrodes of the first P-type MOS tube and the second P-type MOS tube are connected with a bias current source; the drain electrode of the first P-type MOS tube is connected with the drain electrode of the first N-type MOS tube, the drain electrode of the second P-type MOS tube is connected with the drain electrode of the second N-type MOS tube, and the source electrode of the first N-type MOS tube and the source electrode of the second N-type MOS tube are both connected with a power supply; the grid electrode of the first N-type MOS tube is connected with the grid electrode of the second N-type MOS tube, the grid electrode of the first N-type MOS tube is connected with the drain electrode, and the grid electrode output of the second N-type MOS tube is a single-ended signal.
6. A flyback switching power supply adopting the feedback unit of the flyback switching power supply as in any one of claims 1 to 5, comprising an AC input terminal, a primary winding of the transformer, a secondary winding of the transformer, a primary switching tube, a DC output terminal and the feedback unit, wherein the AC input terminal is connected with the primary winding of the transformer; the primary side switching tube is connected in series with the primary side winding of the transformer and is used for controlling the on-off of the primary side winding of the transformer; the direct current output end is connected with the secondary winding of the transformer; the feedback unit is connected with the direct current output end and used for collecting the voltage of the direct current output end and controlling the on-off of the primary side switching tube.
7. A feedback unit chip of a flyback switching power supply is characterized by at least comprising a first die and a second die which are sealed, a frequency discrimination circuit, a capacitor C1 and a capacitor C2 are integrated in the first die, and a differential pressure frequency conversion circuit is integrated in the second die; the positive input end and the negative input end of the frequency discrimination circuit are respectively connected with one end of a capacitor C1 and one end of a capacitor C2, the other ends of the capacitor C1 and the capacitor C2 are connected with a pressure welding point of a first bare chip, the output end of the differential pressure frequency conversion circuit is connected with a pressure welding point of a second bare chip, and the pressure welding point of the first bare chip and the pressure welding point of the second bare chip are connected through at least two in-chip leads.
8. The feedback unit chip of the flyback switching power supply of claim 7, further comprising a third die, wherein the control circuit and the primary switch tube are integrated in the third die, and the third die is connected to the first die through an on-chip lead.
9. The feedback unit chip of the flyback switching power supply as claimed in claim 7, wherein the first die further has a control circuit integrated therein, and the control circuit is connected to the frequency discriminator circuit.
10. The feedback unit chip of the flyback switching power supply of claim 9, further comprising a primary side switching tube, wherein the primary side switching tube is encapsulated in the chip together with the first die and the second die, and the primary side switching tube is connected to the first die through an on-chip lead; or the primary side switching tube is also integrated in the first die.
11. A method for manufacturing a feedback unit chip of a flyback switching power supply as claimed in claim 7, comprising the steps of:
(a1) manufacturing a first bare chip, wherein the first bare chip comprises a frequency discrimination circuit, a capacitor C1 and a capacitor C2; manufacturing a second die, wherein the second die comprises a differential pressure frequency conversion circuit;
(b1) connecting the pressure welding points of the first bare chip and the second bare chip by using an inner chip lead;
(c1) and the first die and the second die are encapsulated into a chip.
12. The method as claimed in claim 11, wherein in the step (a1), the capacitors C1 and C2 are formed by an ultra-thick interlayer isolation process.
13. The method as claimed in claim 11 or 12, wherein the first die in step (a1) further includes a control circuit and a primary side switching tube.
14. The method of claim 11 or 12, wherein the first die in step (a1) further comprises a control circuit; step (c1) further comprises: and the primary side switch tube, the first bare chip and the second bare chip are packaged into a chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911020078.9A CN110611434B (en) | 2019-10-24 | 2019-10-24 | Flyback switching power supply and feedback unit thereof, feedback unit chip and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911020078.9A CN110611434B (en) | 2019-10-24 | 2019-10-24 | Flyback switching power supply and feedback unit thereof, feedback unit chip and manufacturing method thereof |
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| CN110611434B CN110611434B (en) | 2021-08-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765396A (en) * | 2021-09-03 | 2021-12-07 | 广西中科蓝谷半导体科技有限公司 | High-integration ACDC switching power supply chip |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599972A (en) * | 2001-12-06 | 2005-03-23 | 皇家飞利浦电子股份有限公司 | A power converter |
| CN109905031A (en) * | 2017-12-07 | 2019-06-18 | 硅谷实验室公司 | Isolated power transmitting device with integrated transformer and voltage controller |
-
2019
- 2019-10-24 CN CN201911020078.9A patent/CN110611434B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599972A (en) * | 2001-12-06 | 2005-03-23 | 皇家飞利浦电子股份有限公司 | A power converter |
| CN109905031A (en) * | 2017-12-07 | 2019-06-18 | 硅谷实验室公司 | Isolated power transmitting device with integrated transformer and voltage controller |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765396A (en) * | 2021-09-03 | 2021-12-07 | 广西中科蓝谷半导体科技有限公司 | High-integration ACDC switching power supply chip |
| CN113765396B (en) * | 2021-09-03 | 2023-08-25 | 广西中科蓝谷半导体科技有限公司 | High-integration ACDC switching power supply chip |
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| CN110611434B (en) | 2021-08-03 |
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