CN216672862U - Power supply conversion system and control chip thereof - Google Patents
Power supply conversion system and control chip thereof Download PDFInfo
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- CN216672862U CN216672862U CN202122750155.5U CN202122750155U CN216672862U CN 216672862 U CN216672862 U CN 216672862U CN 202122750155 U CN202122750155 U CN 202122750155U CN 216672862 U CN216672862 U CN 216672862U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a power supply conversion system and a control chip thereof. The power conversion system comprises a power device, a primary winding and an auxiliary winding, the control chip is provided with a first pin for being externally coupled with the auxiliary winding, and the control chip comprises: the power supply circuit comprises a switch and an inductor, and is provided with a power supply input end and a power supply output end, wherein the power supply input end is coupled with the first pin, and the power supply output end provides power supply voltage; and the control circuit is provided with a power supply end and a control output end, wherein the power supply end is coupled with the power supply output end of the power supply circuit and used for supplying power for the control circuit, and the control output end is coupled with the control end of the power device. The control chip provided by the utility model can expand the output voltage of the power supply conversion system and reduce the volume of the system.
Description
Technical Field
The present invention relates to the field of electronics, and in particular, but not exclusively, to a control chip for a power conversion system.
Background
Power converters are indispensable components in electronic systems. As is well known, power converters include two main types, namely, a linear converter and a switching power converter, and can be divided into two types, namely, an isolated type and a non-isolated type in terms of conversion mode. In the case of a switching power supply, the isolated converter is widely applied, because the isolated converter can protect a load from being impacted and damaged by high voltage of an input bus, and the isolated converter has wide application in telecommunication wireless networks, automobiles and medical equipment. Among various topologies of the isolated Converter, the Flyback Converter (Flyback Converter) has a simple circuit structure, isolated output and low cost, and occupies a high proportion in the application of terminal equipment. The isolated power conversion system is used in the power adapter of the USB-PD quick-charging protocol due to the advantages. In general, during a start-up phase of a flyback converter system, a starting resistor or a high-voltage starting Junction Field Effect Transistor (JFET) built in a chip is generally used to take power from a bus for supplying power to a circuit in a power controller. After the start is finished, the auxiliary winding continuously supplies power to the power controller chip. The voltage of the auxiliary winding is limited by the variation of the output voltage, resulting in a variation of the supply voltage of the flyback conversion system. However, in the PD fast charging situation, the output voltage required by the load provided by the power conversion system has a large variation range, for example, for PD3.0, the output voltage varies from 3V to 21V, which requires a large variation in the operating range of the power supply voltage. When the supply voltage is high, the loss of the supply circuit inside the chip is also large. Meanwhile, miniaturization is also an important index for a PD-quick charging power supply conversion system.
In view of the above, there is a need to provide a new structure or control method to solve at least some of the above problems.
SUMMERY OF THE UTILITY MODEL
At least the problem or problems in the background art are solved by the present invention, which provides a control chip for a power conversion system.
According to an aspect of the utility model, a control chip for power conversion system is proposed, wherein power conversion system includes power device, primary winding and auxiliary winding, and control chip has first pin and is used for external auxiliary winding that is coupled, and its characterized in that, control chip includes: the power supply circuit comprises a switch and an inductor, and is provided with a power supply input end and a power supply output end, wherein the power supply input end is coupled with the first pin, and the power supply output end provides power supply voltage; and the control circuit is provided with a power supply end and a control output end, wherein the power supply end is coupled with the power supply output end of the power supply circuit and used for supplying power to the control circuit, and the control output end is coupled with the control end of the power device.
In one embodiment, the power supply circuit comprises a voltage boost circuit, the voltage boost circuit comprises a switch, an inductor and a rectifier tube, wherein a first end of the inductor is coupled to a power supply input end of the power supply circuit, a second end of the inductor is coupled to a first end of the switch and a first end of the rectifier tube, a second end of the switch is grounded, and a second end of the rectifier tube is coupled to a power supply output end of the power supply circuit.
In one embodiment, a power supply circuit includes: the boost circuit comprises a switch, an inductor and a rectifying tube, wherein the first end of the inductor is coupled with the power supply input end of the power supply circuit, the second end of the inductor is coupled with the first end of the switch and the first end of the rectifying tube, and the second end of the switch is grounded; a linear circuit including a linear device; and a selection circuit coupled to the boost circuit and the linear circuit, the selection circuit controlling the switch and the linear device based on the supply voltage.
In one embodiment, the control chip is an electronic package.
In one embodiment, the control chip further has a second pin, wherein the first pin is internally coupled to the first end of the inductor, externally coupled to the first end of the diode and the first end of the first capacitor, the second end of the diode is coupled to the first end of the auxiliary winding, and the second end of the first capacitor and the second end of the auxiliary winding are grounded; the second pin is internally coupled with the power supply output end and externally coupled with the first end of the second capacitor, and the second end of the second capacitor is grounded.
According to another aspect of the utility model, a control chip is proposed, include: the power supply circuit is provided with a power supply input end and a power supply output end and comprises a switch and an inductor; and the control circuit is provided with a power supply end and a control output end, the power supply end of the control circuit is coupled with the power supply output end of the power supply circuit, and the control output end of the control circuit is coupled with the control end of the power device and used for providing a control signal for controlling the power device.
In one embodiment, wherein the power supply circuit comprises: the boost circuit comprises a switch, an inductor and a rectifying tube, wherein the first end of the inductor is coupled with the power supply input end of the power supply circuit, the second end of the inductor is coupled with the first end of the switch and the first end of the rectifying tube, the second end of the switch is grounded, and the second end of the rectifying tube is coupled with the power supply output end of the power supply circuit; the linear circuit comprises a linear device, wherein the linear device is provided with a first end, a second end and a control end, the first end of the linear device is coupled with the power supply input end of the power supply circuit or the second end of the inductor, and the second end of the linear device is coupled with the power supply output end of the power supply circuit; and the selection circuit is provided with an input end and two enabling output ends, wherein the input end of the selection circuit is coupled with the power supply output end of the power supply circuit, the two enabling output ends of the selection circuit are respectively coupled with the booster circuit and the linear circuit, and the selection circuit enables the switch circuit or the linear circuit based on the power supply voltage provided by the power supply output end.
In one embodiment, a power supply circuit includes: the boost circuit comprises a switch, an inductor and a rectifying tube, wherein the first end of the inductor is coupled with the power supply input end of the power supply circuit, the second end of the inductor is coupled with the first end of the switch and the first end of the rectifying tube, the second end of the switch is grounded, and the second end of the rectifying tube is coupled with the power supply output end of the power supply circuit; the linear circuit comprises a linear device, wherein the linear device is provided with a first end, a second end and a control end, the first end of the linear device is coupled with the power supply input end of the power supply circuit, and the second end of the linear device is coupled with the power supply output end of the power supply circuit; and the selection circuit is coupled with the power supply input end of the power supply circuit, the booster circuit and the linear circuit, and enables the switch circuit or the linear circuit based on the power supply input voltage of the power supply input end.
In one embodiment, the control chip is provided with a first pin and a second pin, wherein the first pin is externally used for coupling a first capacitor and is coupled with an auxiliary winding through a first diode, and internally coupled with an inductor; the second pin is externally used for being coupled with the second capacitor and providing power supply voltage, and is internally coupled with a power supply output end of the power supply circuit and a power supply end of the control circuit.
According to another aspect of the present invention, a power conversion system is provided, wherein the power conversion system includes a power device, a primary winding, an auxiliary winding, and a control chip as described in any of the above embodiments.
In one embodiment, the power conversion system has a flyback voltage conversion structure.
The control chip and the power supply conversion system provided by the utility model can supply power to the control circuit in the chip in a larger output voltage range, and have fewer peripheral circuits and smaller volume.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model.
FIG. 1 shows a schematic diagram of a power conversion system according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of the internal structure of the control chip 20 according to an embodiment of the present invention;
fig. 3 shows an internal structure diagram of the control chip 30 according to another embodiment of the present invention.
Detailed Description
For a further understanding of the utility model, reference will now be made to the preferred embodiments of the utility model by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the utility model, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. Combinations of different embodiments, and substitutions of features from different embodiments, or similar prior art means may be substituted for or substituted for features of the embodiments shown and described.
The term "coupled" or "connected" in this specification includes both direct and indirect connections. An indirect connection is a connection made through an intermediary, such as a conductor, where the electrically conductive medium may contain parasitic inductance or parasitic capacitance, or through an intermediary circuit or component as described in embodiments herein; indirect connections may also include connections through other active or passive devices that perform the same or similar function, such as connections through switches, signal amplification circuits, follower circuits, and so on. "plurality" or "plurality" means two or more.
Fig. 1 shows a schematic diagram of a power conversion system according to an embodiment of the utility model. In the illustrated embodiment, the power conversion system is an isolated power conversion system, and includes a primary circuit and a secondary circuit, which are isolated by a transformer, wherein the primary circuit has a primary winding Lp and a power device Q1. The secondary circuit has a secondary winding Ls and a rectifier Do. Based on the control of the power device Q1, the power conversion system converts an input voltage Vin input to the primary circuit into an output voltage Vout at the output of the secondary circuit, for driving the load. In one embodiment, the output voltage Vout is a voltage source satisfying the USB-PD fast charge protocol, and the power conversion system is used in a PD fast charge power adapter. The power conversion system further comprises an auxiliary winding La, a first capacitor C1, a second capacitor C2, a diode D1 and a control chip 10 for controlling the power device Q1, wherein the control chip 10 has a first pin VDDH, a second pin VDDL, a third pin Gate and a fourth pin CS. Wherein the first terminal of the auxiliary winding La is coupled to the anode of the first diode D1, the second terminal of the auxiliary winding La is grounded, the cathode of the diode D1 is coupled to the first terminal of the first capacitor C1 and the first pin VDDH of the control chip 10 and internally connects the power supply input terminal 11 of the power supply circuit 101 of the control chip 10, and the second terminal of the first capacitor C1 is grounded. The first capacitor C1 is used to provide the power supply input voltage to the control chip 10 through the first pin VDDH. The second capacitor C2 is coupled to the second pin VDDL and provides a supply voltage at the second pin VDDL. The control chip 10 includes a power supply circuit 101 and a control circuit 102. The power supply circuit 101 includes a switch K and an inductor K, i.e., the switch K and the inductor L are fabricated inside the control chip 10. The control chip 10 may be fabricated based on electronic packaging technology. The supply circuit 101 has a supply input 11 and a supply output 12, wherein the supply input 11 of the supply circuit 101 is coupled to a first supply pin VDDH for coupling to the auxiliary winding La, and the supply output 12 of the supply circuit 101 is coupled to a second supply pin VDDL for providing a supply voltage. Preferably, the power supply circuit 101 comprises a Boost (Boost) circuit including an inductor L coupled to the first pin VDDH, a switch K coupled to the inductor L, and a rectifier coupling the inductor L and the switch K, an output terminal of the Boost circuit being coupled to the second capacitor C2 for providing the power supply voltage at the second pin VDDL. In other embodiments, the power supply circuit 101 may also include a Buck-boost (Buck-boost) circuit or other types of switching circuits. The control circuit 102 has a supply terminal 13 and a control output terminal 14, wherein the supply terminal 13 of the control circuit 102 is coupled to the supply output terminal 12 of the supply circuit, that is, the second pin VDDL is used for enabling the supply circuit 101 to supply power to the control circuit 102, and the control output terminal 14 of the control circuit 102 is coupled to the control terminal of the power device Q1 through the third pin Gate for providing a control signal for controlling the power device Q1 to regulate the output voltage Vout. In one embodiment, the control chip 10 is an electronic package, encapsulating the control circuit 102 die and the inductor L inside. In one embodiment, the control chip 10 includes a first chip, a second chip and an inductor L, wherein the first chip has the control circuit 102 fabricated therein, and the second chip has the switch K fabricated therein.
The illustrated power conversion system has a Flyback (Flyback) voltage conversion structure, and in other embodiments, the power conversion system may also adopt other topologies, such as a forward voltage converter, a Buck-type voltage converter, and the like, for example, an auxiliary winding obtains an auxiliary voltage source through inductive coupling of a transformer and a Buck circuit.
In the illustrated embodiment, the first capacitor C1 and the diode D1 are not disposed in the control chip 10, the first pin VDDH of the control chip 10 is externally coupled to the cathode of the diode D1 and the first end of the first capacitor C1, the second end of the first capacitor is grounded, the anode of the diode D1 is coupled to the first end of the auxiliary winding La, and the second end of the auxiliary winding La is grounded. In another embodiment, the first capacitor C1 and the diode D1 are fabricated inside the control chip 10, and the first pin VDDH of the control chip 10 can be directly coupled to the auxiliary winding La.
In the illustrated embodiment, the second capacitor C2 is a peripheral device and is coupled to the control chip 10 through a second pin VDDL. In another embodiment, the second capacitor C2 is fabricated inside the control chip 10, and the control chip 10 may not have the second pin VDDL for supplying the power supply voltage.
In the illustrated embodiment, the control chip 10 has a third pin Gate externally coupled to the control terminal of the power device Q1, and a fourth pin CS inputting a current sampling signal into the control circuit 102. In another embodiment, the power device Q1 is disposed inside the control chip 10, and the third pin is directly coupled to the second end of the primary winding Lp, wherein the first end of the primary winding Lp receives the input voltage Vin.
The power supply circuit can effectively increase or control the power supply voltage VDDH, so that the power supply system can provide enough driving voltage for the control circuit when the PD quick charging adapter with lower output voltage Vout or larger output voltage Vout change is needed. Meanwhile, the inductor is arranged in the control chip in a built-in mode, peripheral devices are reduced, the system has high density and high integration degree, and the power supply conversion system is miniaturized.
Fig. 2 is a schematic diagram illustrating an internal structure of the control chip 20 according to an embodiment of the present invention. The control chip 20 includes a power supply circuit 201 and a control circuit 202. The power supply circuit 201 includes a Boost circuit, which includes an inductor L, a switch K, and a second rectifier D2. Wherein a first terminal of the inductor L is coupled to the power input terminal 21 of the power supply circuit 201 and is coupled to the auxiliary winding La via a diode D1 via a first pin VDDH. The second terminal of the inductor L is coupled to the first terminal of the switch K and the first terminal of the rectifier D2, the second terminal of the switch K is grounded, and the second terminal of the rectifier D2 is coupled to the power supply output terminal 22 of the power supply circuit 201 and is coupled to the second capacitor C2 via the second pin VDDL of the control chip 20 to provide the power supply voltage source for the control circuit 202.
Fig. 3 shows an internal structure diagram of the control chip 30 according to another embodiment of the present invention. The power supply circuit 301 in the control chip 30 includes a Boost (Boost) circuit 31, a linear circuit 32, and a selection circuit 33. The Boost circuit 31 includes an inductor L, a switch K, and a second rectifier D2. The first terminal of the inductor L is coupled to the power input terminal of the power supply circuit 301 and is coupled to the auxiliary winding La through the diode D1 via the first pin VDDH. The second terminal of the inductor L is coupled to the first terminal of the switch K and the first terminal of the rectifier D2, the second terminal of the switch K is grounded, and the second terminal of the rectifier D2 provides the output voltage of the Boost circuit 31. The linear circuit 32 includes a linear device LN, and a first end of the linear device LN is coupled to the first pin VDDH or a second end of the inductor L1. In another embodiment, the first terminal of the linear device LN is coupled to the second terminal of the inductance L. A second terminal of the linear device LN provides the output voltage of the linear circuit 32. In the illustrated embodiment, the output terminal of the Boost circuit 31 and the output terminal of the linear circuit 32 are both directly coupled to the power supply output terminal of the power supply circuit 301, i.e., coupled to a second pin VDDL, wherein the second pin VDDL is externally coupled to a second capacitor C2 for providing the power supply voltage source VDD for the control circuit 302. The selection circuit 33 has two enable output terminals EN1 and EN2 for coupling the enable terminal of the Boost circuit 31 and the enable terminal of the linear circuit 32, respectively, and the selection circuit 33 selects the enable Boost circuit 31 or the linear circuit 32 based on the supply voltage VDD of the supply output terminal of the supply circuit 301 or the supply input voltage Vin of the supply input terminal of the supply circuit 301. In another embodiment, the selection circuit includes two switch tubes respectively coupled between the output terminal of the voltage boosting circuit 31 and the second pin VDDL and between the output terminal of the linear circuit 32 and the second pin VDDL. The selection circuit 33 couples the output voltage of the Boost circuit 31 or the linear circuit 32 to the second pin VDDL by controlling the conduction of the two switching tubes.
When the output voltage of the power conversion system is low, the power supply input voltage Vin is also low, and at this time, the selection switch boosting circuit 31 works to make the power supply voltage VDD higher than the power supply input voltage Vin, and supplies power to the control circuit after boosting. When the output voltage is higher, the power supply input voltage Vin is also higher, and at this time, the selection linear circuit 32 works to make the power supply voltage VDD lower than the power supply input voltage Vin, and supplies power to the control circuit after voltage reduction. Therefore, no matter how the output voltage changes, the power supply voltage can be limited in a reasonable range, and the output range of the output voltage under the occasions of PD quick charging protocol and the like can be expanded.
The description and applications of the utility model herein are illustrative and are not intended to limit the scope of the utility model to the embodiments described above. The descriptions related to the effects or advantages in the specification may not be reflected in practical experimental examples due to uncertainty of specific condition parameters or influence of other factors, and the descriptions related to the effects or advantages are not used for limiting the scope of the utility model. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the utility model.
Claims (11)
1. A control chip for a power conversion system, wherein the power conversion system comprises a power device, a primary winding and an auxiliary winding, the control chip has a first pin for externally coupling the auxiliary winding, and the control chip comprises:
the power supply circuit comprises a switch and an inductor, and is provided with a power supply input end and a power supply output end, wherein the power supply input end is coupled with the first pin, and the power supply output end provides power supply voltage; and
and the control circuit is provided with a power supply end and a control output end, wherein the power supply end is coupled with the power supply output end of the power supply circuit and used for supplying power to the control circuit, and the control output end is coupled with the control end of the power device.
2. The control chip of claim 1, wherein the power supply circuit comprises a boost circuit, the boost circuit comprising a switch, an inductor, and a rectifier, wherein a first terminal of the inductor is coupled to the power input of the power supply circuit, a second terminal of the inductor is coupled to the first terminal of the switch and the first terminal of the rectifier, a second terminal of the switch is coupled to ground, and a second terminal of the rectifier is coupled to the power output of the power supply circuit.
3. The control chip of claim 1, wherein the power supply circuit comprises:
the boost circuit comprises a switch, an inductor and a rectifying tube, wherein the first end of the inductor is coupled with the power supply input end of the power supply circuit, the second end of the inductor is coupled with the first end of the switch and the first end of the rectifying tube, and the second end of the switch is grounded;
a linear circuit including a linear device; and
and the selection circuit is coupled with the booster circuit and the linear circuit and controls the switch and the linear device based on the supply voltage.
4. The control chip of claim 1, wherein the control chip is an electronic package.
5. The control chip according to any one of claims 1 to 3, wherein the control chip further has a second pin, wherein the first pin is internally coupled to a first terminal of the inductor and externally coupled to a first terminal of the diode and a first terminal of the first capacitor, a second terminal of the diode is coupled to a first terminal of the auxiliary winding, and a second terminal of the first capacitor and a second terminal of the auxiliary winding are grounded; the second pin is internally coupled with the power supply output end and externally coupled with the first end of the second capacitor, and the second end of the second capacitor is grounded.
6. A control chip, comprising:
the power supply circuit is provided with a power supply input end and a power supply output end and comprises a switch and an inductor; and
the control circuit is provided with a power supply end and a control output end, the power supply end of the control circuit is coupled with the power supply output end of the power supply circuit, and the control output end of the control circuit is coupled with the control end of the power device and used for providing a control signal for controlling the power device.
7. The control chip of claim 6, wherein the power supply circuit comprises:
the boost circuit comprises a switch, an inductor and a rectifying tube, wherein the first end of the inductor is coupled with the power supply input end of the power supply circuit, the second end of the inductor is coupled with the first end of the switch and the first end of the rectifying tube, the second end of the switch is grounded, and the second end of the rectifying tube is coupled with the power supply output end of the power supply circuit;
the linear circuit comprises a linear device, wherein the linear device is provided with a first end, a second end and a control end, the first end of the linear device is coupled with the power supply input end of the power supply circuit or the second end of the inductor, and the second end of the linear device is coupled with the power supply output end of the power supply circuit; and
the selection circuit is provided with an input end and two enabling output ends, wherein the input end of the selection circuit is coupled with the power supply output end of the power supply circuit, the two enabling output ends of the selection circuit are respectively coupled with the booster circuit and the linear circuit, and the selection circuit enables the switch circuit or the linear circuit based on the power supply voltage provided by the power supply output end.
8. The control chip of claim 6, wherein the power supply circuit comprises:
the boost circuit comprises a switch, an inductor and a rectifying tube, wherein the first end of the inductor is coupled with the power supply input end of the power supply circuit, the second end of the inductor is coupled with the first end of the switch and the first end of the rectifying tube, the second end of the switch is grounded, and the second end of the rectifying tube is coupled with the power supply output end of the power supply circuit;
the linear circuit comprises a linear device, wherein the linear device is provided with a first end, a second end and a control end, the first end of the linear device is coupled with the power supply input end of the power supply circuit or the second end of the inductor, and the second end of the linear device is coupled with the power supply output end of the power supply circuit; and
and the selection circuit is coupled with the power supply input end of the power supply circuit, the booster circuit and the linear circuit, and enables the switch circuit or the linear circuit based on the power supply input voltage of the power supply input end.
9. The control chip of claim 6, wherein the control chip has a first pin and a second pin, wherein the first pin is externally coupled to a first capacitor and coupled to the auxiliary winding through a first diode, and internally coupled to an inductor; the second pin is externally used for being coupled with the second capacitor and providing power supply voltage, and is internally coupled with a power supply output end of the power supply circuit and a power supply end of the control circuit.
10. A power conversion system comprising a power device, a primary winding, an auxiliary winding, and a control chip according to any one of claims 1 to 4 or a control chip according to any one of claims 6 to 9.
11. The power conversion system of claim 10, wherein the power conversion system has a flyback voltage conversion architecture.
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| CN202122750155.5U CN216672862U (en) | 2021-11-09 | 2021-11-09 | Power supply conversion system and control chip thereof |
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| CN202122750155.5U CN216672862U (en) | 2021-11-09 | 2021-11-09 | Power supply conversion system and control chip thereof |
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