CN221150004U - Package structure and power conversion circuit - Google Patents
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- CN221150004U CN221150004U CN202322441278.XU CN202322441278U CN221150004U CN 221150004 U CN221150004 U CN 221150004U CN 202322441278 U CN202322441278 U CN 202322441278U CN 221150004 U CN221150004 U CN 221150004U
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Abstract
A package structure and a power conversion circuit, the package structure comprising: insulating plastic package, electromagnetic coupler and lead frame; the lead frame extends to the outside of the insulating plastic package to form a plurality of mutually independent pins which are not electrically connected with each other; any one of the plurality of pins extends out of the first base island towards the inside of the lead frame; the electromagnetic coupler is mounted on the first base island. By adopting the scheme, the circuit area occupied by devices required for realizing electric isolation transmission can be reduced, and the feedback bandwidth and the transient response of the power conversion circuit are not influenced.
Description
Technical Field
The present utility model relates to the field of power technologies, and in particular, to a packaging structure and a power conversion circuit.
Background
Currently, in isolated power conversion circuits, transformers are typically used to achieve electrical isolation between the input and output and power transfer. Typically, the primary power switching device controls the output side (i.e., the secondary winding) on the input side (i.e., the primary winding) of the transformer.
To construct a feedback control loop, an electrical signal (current or voltage) on the output side of the transformer is sampled and the main power switching device is controlled using the electrical signal on the output side as a control signal. To achieve electrical isolation of the power conversion circuit, it is also necessary to conduct an electrically isolated transmission of the feedback loop.
In the prior art, opto-coupler isolation devices are typically added to the feedback loop to achieve electrically isolated transmission. The feedback loop also comprises a sampling compensation circuit matched with the optocoupler isolation device, and occupies a larger circuit area. In addition, the response speed of the optical coupling isolation device is low, and the optical attenuation of the optical coupling isolation device also causes the change of loop characteristics, so that the feedback bandwidth and the transient response of the power conversion circuit are further deteriorated.
Disclosure of utility model
The utility model aims to provide a packaging structure, an electromagnetic coupler and a power conversion circuit, which can reduce the circuit area occupied by devices required by realizing electric isolation transmission and can not influence the feedback bandwidth and transient response of the power conversion circuit.
In a first aspect, an embodiment of the present utility model provides a package structure, including: insulating plastic package, electromagnetic coupler and lead frame; the lead frame extends to the outside of the insulating plastic package to form a plurality of mutually independent pins which are not electrically connected with each other; any one of the plurality of pins extends out of the first base island towards the inside of the lead frame; the electromagnetic coupler is mounted on the first base island.
In the utility model, the pins of the lead frame extend to the inside of the lead frame to form the base island, and the electromagnetic coupler is mounted on the base island, so that the electromagnetic coupler is packaged in the packaging structure. Compared with the traditional optocoupler isolation mode, the packaging structure provided by the utility model needs to be additionally provided with an additional compensation circuit, and the packaging structure does not need to be additionally provided with a peripheral circuit, so that the circuit area occupied by the electromagnetic coupler can be reduced, and the cost is reduced.
Optionally, the electromagnetic coupler is a die of a semiconductor device.
Optionally, the electromagnetic coupler includes a plurality of ports, and the corresponding ports are electrically connected with corresponding pins in the lead frame, and generate a response signal in response to a control signal output by the secondary side controller, and output the response signal to the primary side controller; the response signal is obtained by electromagnetic induction based on the control signal.
Optionally, the electromagnetic coupler includes a plurality of ports, and the corresponding ports are electrically connected with corresponding pins in the lead frame, and generate a response signal in response to a control signal output by the secondary side controller, and output the response signal to the primary side controller; the response signal is obtained by electromagnetic induction based on the control signal.
The electromagnetic coupler is used for converting the control signal into the response signal, and a peripheral circuit is not required to be additionally arranged, so that the circuit area occupied by devices required for realizing electric isolation transmission can be effectively reduced, and the feedback bandwidth and the transient response of the power conversion circuit are not influenced.
Optionally, the plurality of pins include a signal input pin, a signal output pin, a first ground pin, and a second ground pin; the signal input pin is coupled with the secondary side controller and inputs the control signal; the signal output pin is coupled with the primary side controller and outputs the response signal; the first grounding pin is commonly grounded with the grounding pin of the secondary side controller, and the second grounding pin is commonly grounded with the grounding pin of the primary side controller.
Optionally, the electromagnetic coupler includes a first port, a second port, a third port, and a fourth port; the first port of the electromagnetic coupler is coupled with the signal input pin, the second port of the electromagnetic coupler is coupled with the first grounding pin, the third port of the electromagnetic coupler is coupled with the signal output pin, and the fourth port of the electromagnetic coupler is coupled with the second grounding pin.
Optionally, the package structure further includes: any one of a plurality of pins different from the pins from which the first base island extends inward extends toward the inside of the lead frame, and the secondary side controller is mounted on the second base island.
In the utility model, the secondary side controller and the electromagnetic coupler are integrated in the packaging structure, so that the occupied circuit area can be further reduced.
Optionally, the plurality of pins include a feedback pin, a signal output pin, a first power pin, a first ground pin, and a second ground pin; the signal output pin is coupled with the primary side controller and outputs the response signal; the feedback pin inputs the sampling voltage of the output voltage of the secondary winding, and the first power supply pin inputs the output voltage of the secondary winding; the first port of the secondary side controller is coupled with the feedback pin, the second port of the secondary side controller is coupled with the first power pin, the third port of the secondary side controller is coupled with the first grounding pin, and the fourth port of the secondary side controller is coupled with the first port of the electromagnetic coupler; the second port of the electromagnetic coupler is coupled with the first grounding pin, the third port of the electromagnetic coupler is coupled with the signal output pin, and the fourth port of the electromagnetic coupler is coupled with the second grounding pin.
Optionally, the package structure further includes: any one of a plurality of pins different from the pins from which the first base island extends inward extends toward the inside of the lead frame, and a third base island on which the primary side controller is mounted.
In the utility model, the primary side controller and the electromagnetic coupler are integrated in the packaging structure, so that the occupied circuit area can be further reduced.
Optionally, the lead frame includes a signal input pin, an output pin, a second power pin, a first ground pin, and a second ground pin; the signal input pin is coupled with the secondary side controller and inputs the control signal; the output pin is coupled with the control end of a main power switch device in the power conversion circuit; the second power supply pin inputs the input voltage of the primary winding; the first port of the primary side controller is coupled with the second grounding pin, the second port of the primary side controller is coupled with the third port of the electromagnetic coupler, the third port of the primary side controller is coupled with the second power pin, and the fourth port of the primary side controller is coupled with the output pin; the first port of the electromagnetic coupler is coupled with the signal input pin, the second port of the electromagnetic coupler is coupled with the first grounding pin, and the fourth port of the electromagnetic coupler is coupled with the second grounding pin.
Optionally, any two different pins of the plurality of pins different from the pins extending inwards from the first base island extend respectively to the inside of the lead frame to form a second base island and a third base island, and the secondary side controller is mounted on the second base island; the primary side controller is mounted on the third base island.
Optionally, the lead frame includes a feedback pin, an output pin, a first power pin, a second power pin, a first ground pin, and a second ground pin; the feedback pin inputs the sampling voltage of the output voltage of the secondary winding, the output pin is coupled with the control end of a main power switch device in the power conversion circuit, the first power pin inputs the output voltage of the secondary winding, and the second power pin inputs the input voltage of the primary winding; the first port of the secondary side controller is coupled with the feedback pin, the second port of the secondary side controller is coupled with the first power pin, the third port of the secondary side controller is coupled with the first grounding pin, and the fourth port of the secondary side controller is coupled with the first port of the electromagnetic coupler; the second port of the primary side controller is coupled with the second grounding pin, the first port of the primary side controller is coupled with the third port of the electromagnetic coupler, the third port of the primary side controller is coupled with the second power pin, and the fourth port of the primary side controller is coupled with the output pin; the second port of the electromagnetic coupler is coupled with the first ground pin, and the fourth port of the electromagnetic coupler is coupled with the second ground pin.
In the utility model, the primary side controller, the secondary side controller and the electromagnetic coupler are integrated in the packaging structure, so that the integration level of the device is improved, and meanwhile, the occupied circuit area is greatly reduced.
Optionally, the electromagnetic coupler includes: the device comprises a substrate, an insulating medium layer, a passivation layer, a first coil and a second coil; the first coil and the second coil are isolated from each other and magnetically coupled to form a communication link; the first terminal of the first coil is a first port of the electromagnetic coupler, and the second terminal of the first coil is a second port of the electromagnetic coupler; the first terminal of the second coil is a third port of the electromagnetic coupler, and the second terminal of the second coil is a fourth port of the electromagnetic coupler; the substrate is provided with the insulating medium layer, the insulating medium layer is provided with the passivation layer, and the first coil and the second coil are mutually isolated through the insulating medium layer.
In the utility model, the first coil and the second coil of the electromagnetic coupler are mutually isolated through the insulating medium layer, and the signal transmission is realized based on the principle of electromagnetic induction.
Optionally, the second coil further includes a third terminal; the third terminal is led out from the middle winding part of the second coil; the second terminal of the second coil or the third terminal of the second coil replaces the second terminal of the second coil as the fourth port of the electromagnetic coupler.
In the utility model, the electromagnetic coupler is provided with the third terminal at the middle position of the coil, and the number of coils of magnetic coupling is changed by changing pin connection, so that the electromagnetic coupler can be compatible with control circuits with different accuracies.
Optionally, the first coil is in a spiral shape, and the second coil is in a spiral shape.
Optionally, the first coil and the second coil are each formed by a layer of spiral coils.
Optionally, the first coil and the second coil are both disposed in the insulating medium layer, the first coil is disposed in a first portion of the insulating medium layer, the second coil is disposed in a third portion of the insulating medium layer, and the first portion, the second portion, the third portion and the fourth portion of the insulating medium layer are sequentially included between the passivation layer and the substrate; the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the same or different portions of the insulating medium layer, the first terminal of the first coil and the second terminal of the first coil are located near the edge of the insulating medium layer, the first terminal of the second coil and the second terminal of the second coil are located near the other edge of the insulating medium layer, and the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the middle of the insulating medium layer.
Optionally, the first coil is formed of a multi-layer spiral coil.
Optionally, different layers of spiral coils of the first coil are respectively arranged in a first part of the insulating medium layer and a third part of the insulating medium layer, the second coil is arranged in a fifth part of the insulating medium layer, and the first part, the second part, the third part, the fourth part, the fifth part and the sixth part of the insulating medium layer are sequentially arranged between the passivation layer and the substrate; the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the same or different portions of the insulating medium layer, the first terminal of the first coil and the second terminal of the first coil are located near the edge of the insulating medium layer, the first terminal of the second coil and the second terminal of the second coil are located near the other edge of the insulating medium layer, and the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the insulating medium layer at intervals; the central position of the first layer spiral coil of the first coil is connected with the central position of the second layer spiral coil of the first coil in the insulating medium layer.
According to the utility model, the first coil is arranged as a plurality of layers of spiral coils, the center point of the first coil is wound out through the added layer of spiral coils, so that the terminal is conveniently led out, and the condition that the center points of the two coils are directly led out from the terminal due to insufficient distance between the first coil and the second coil is avoided.
Optionally, the first coil and the second coil form a nested structure.
Optionally, the first coil, the first terminal of the first coil, the second coil, the first terminal of the second coil, and the second terminal of the second coil are all disposed in the insulating medium layer; the first terminal of the first coil and the first terminal of the second coil are arranged at the center position in the insulating medium layer at intervals, the second terminal of the first coil is arranged at a position close to the edge of the insulating medium layer, and the second terminal of the second coil is arranged at a position close to the other edge of the insulating medium layer.
In the utility model, the first coil and the second coil are arranged in a nested structure, so that the thickness of the electromagnetic coupler is reduced, the space is saved, the cost is saved, and the installation is convenient.
In a second aspect, an embodiment of the present utility model provides an electromagnetic coupler, including: the device comprises a substrate, an insulating medium layer, a passivation layer, a first coil and a second coil, wherein the first coil and the second coil are isolated from each other and are magnetically coupled to form a communication link; the first terminal of the first coil is a first port of the electromagnetic coupler, and the second terminal of the first coil is a second port of the electromagnetic coupler; the first terminal of the second coil is a third port of the electromagnetic coupler, and the second terminal of the second coil is a fourth port of the electromagnetic coupler; the substrate is provided with the insulating medium layer, the insulating medium layer is provided with the passivation layer, and the first coil and the second coil are mutually isolated through the insulating medium layer.
In the utility model, the first coil and the second coil of the electromagnetic coupler are mutually isolated through the insulating medium layer, and the signal transmission is realized based on the principle of electromagnetic induction. The electromagnetic coupler has the advantages of simple structure, lower cost, high withstand voltage and better stability.
Optionally, the second coil further includes a third terminal; the third terminal is led out from the middle winding part of the second coil; the second terminal of the second coil or the third terminal of the second coil replaces the second terminal of the second coil as the fourth port of the electromagnetic coupler.
In the utility model, the electromagnetic coupler is provided with the third terminal at the middle position of the third coil, and the number of coils of magnetic coupling is changed by changing pin connection, so that the electromagnetic coupler can be compatible with control circuits with different precision.
Optionally, the first coil is in a spiral shape, and the second coil is in a spiral shape.
Optionally, the first coil and the second coil are each formed by a layer of spiral coils.
Optionally, the first coil and the second coil are both disposed in the insulating medium layer, the first coil is disposed in a first portion of the insulating medium layer, the second coil is disposed in a third portion of the insulating medium layer, and the first portion, the second portion, the third portion and the fourth portion of the insulating medium layer are sequentially disposed between the passivation layer and the substrate; the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the same or different portions of the insulating medium layer, the first terminal of the first coil and the second terminal of the first coil are located at an edge of the insulating medium layer, the first terminal of the second coil and the second terminal of the second coil are located at another edge of the insulating medium layer, and the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the insulating medium layer at intervals.
Optionally, the first coil is formed of a multi-layer spiral coil.
Optionally, different layers of spiral coils of the first coil are respectively arranged in a first part of the insulating medium layer and a third part of the insulating medium layer, the second coil is arranged in a fifth part of the insulating medium layer, and the first part, the second part, the third part, the fourth part, the fifth part and the sixth part of the insulating medium layer are sequentially arranged between the passivation layer and the substrate; the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the same or different portions of the insulating medium layer, the first terminal of the first coil and the second terminal of the first coil are located at an edge of the insulating medium layer, the first terminal of the second coil and the second terminal of the second coil are located at another edge of the insulating medium layer, and the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the insulating medium layer at intervals; the central position of the first layer spiral coil of the first coil is connected with the central position of the second layer spiral coil of the first coil in the insulating medium layer.
According to the utility model, the first coil is arranged as a plurality of layers of spiral coils, the center point of the first coil is wound out through the added layer of spiral coils, so that the terminal is conveniently led out, and the condition that the center points of the two coils are directly led out from the terminal due to insufficient distance between the first coil and the second coil is avoided.
Optionally, the first coil and the second coil form a nested structure.
Optionally, the first coil, the first terminal of the first coil, the second coil, the first terminal of the second coil, and the second terminal of the second coil are all disposed in the insulating medium layer; the first terminal of the first coil and the first terminal of the second coil are arranged at the center position in the insulating medium layer at intervals, the second terminal of the first coil is arranged at the edge of the insulating medium layer, and the second terminal of the second coil is arranged at the other edge of the insulating medium layer.
In the utility model, the first coil and the second coil are arranged in a nested structure, so that the thickness of the electromagnetic coupler is reduced, the space is saved, the cost is saved, and the installation is convenient.
In a third aspect, an embodiment of the present utility model further provides a power conversion circuit, including: rectifier bridge, primary winding, primary side controller, secondary winding, secondary side controller, main power switching device and electromagnetic coupler, wherein: the input end of the rectifier bridge inputs alternating current, the output end of the rectifier bridge outputs direct current corresponding to the alternating current, and the rectifier bridge is suitable for rectifying the input alternating current into direct current; the primary winding is coupled with the output end of the rectifier bridge at a first end and coupled with the first end of the main power switch device at a second end; the primary side controller is coupled with the output end of the rectifier bridge at the power end, the input end of the primary side controller is coupled with the output end of the electromagnetic coupler, and the output end of the primary side controller is coupled with the control end of the main power switch device; the first end of the secondary winding is coupled with the power end of the secondary controller, and the second end of the secondary winding is grounded; the input end of the secondary side controller is coupled with the first end of the secondary side winding, and the output end of the secondary side controller is coupled with the input end of the electromagnetic coupler; the second end of the main power switch device is grounded; the lead frame of the electromagnetic coupler extends to the outside of the insulating plastic package to form a plurality of mutually independent pins which are not electrically connected with each other; a first lead of the plurality of leads extends out of a first base island towards the inside of the lead frame; the electromagnetic coupler is mounted on the first base island.
In a fourth aspect, the present utility model further provides another power conversion circuit, including any one of the above-mentioned package structures.
In a fifth aspect, an embodiment of the present utility model further provides a power conversion circuit, including any one of the electromagnetic couplers described above.
Drawings
Fig. 1 is a circuit configuration diagram of a conventional power conversion circuit;
Fig. 2 is a circuit configuration diagram of a power conversion circuit in an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a package structure according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of another package structure in an embodiment of the utility model;
FIG. 5 is a schematic diagram of yet another package structure in accordance with an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a package structure of another electromagnetic coupler according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of an electromagnetic coupler according to an embodiment of the present utility model;
FIG. 8 is a schematic diagram of another electromagnetic coupler in an embodiment of the utility model;
FIG. 9 is a schematic diagram of another package structure in an embodiment of the utility model;
FIG. 10 is a schematic diagram of current waveforms of a first coil and a second coil according to an embodiment of the present utility model;
FIG. 11 is a schematic diagram of current waveforms of the first coil and the second coil according to another embodiment of the present utility model;
FIG. 12 is a top view of an electromagnetic coupler in an embodiment of the utility model;
FIG. 13 is a schematic cross-sectional view of A-A of the electromagnetic coupler provided in FIG. 12;
FIG. 14 is a side view of another electromagnetic coupler in an embodiment of the utility model;
FIG. 15 is a top view of the electromagnetic coupler provided in FIG. 14;
FIG. 16 is a schematic B-B cross-sectional view of the electromagnetic coupler provided in FIG. 14;
FIG. 17 is a front view of yet another electromagnetic coupler in an embodiment of the utility model;
Fig. 18 is a C-C cross-sectional schematic view of the electromagnetic coupler provided in fig. 17.
Detailed Description
In the prior art, opto-coupler isolation devices are typically added to the feedback loop to achieve electrically isolated transmission. In the feedback loop, a sampling compensation circuit matched with the optical coupling isolation device is also included. Referring to fig. 1, a circuit configuration diagram of a conventional power conversion circuit is shown.
In fig. 1, a sampling compensation circuit 11 is connected to an output end of a secondary winding, samples an electrical signal (current or voltage) of the output end of the secondary winding, and converts the collected electrical signal into a control signal through logic control and inputs the control signal to an optocoupler isolation device 12. The optocoupler isolation device 12 outputs the received control signal to the primary side controller 13, and the primary side controller 13 controls the main power switching device M1.
As can be seen, in the existing power conversion circuit using the optocoupler isolation device 12, the sampling compensation circuit 11 is additionally arranged, and the optocoupler isolation device 12 and the sampling compensation circuit 11 occupy a larger circuit area. In addition, the response speed of the optocoupler isolation device 12 is slow, and the optical attenuation of the optocoupler isolation device 12 also causes the loop characteristic to change, so that the feedback bandwidth and the transient response of the power conversion circuit are degraded.
In the embodiment of the utility model, an electromagnetic coupler is arranged between the secondary side controller and the primary side controller. The electromagnetic coupler converts a control signal output by the secondary side controller into a corresponding response signal based on electromagnetic induction, and outputs the response signal to the primary side controller, so that the primary side controller controls the main power switch device based on the response signal. Because only the electromagnetic coupler is needed, and the electromagnetic coupler does not need to be additionally provided with a sampling compensation circuit, the circuit area occupied by devices required for realizing electric isolation transmission can be effectively reduced, and the feedback bandwidth and the transient response of the power conversion circuit are not influenced.
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Referring to fig. 2, a circuit configuration diagram of a power conversion circuit in an embodiment of the present utility model is shown. The power conversion circuit may include a primary winding, a primary controller, a secondary winding, a secondary controller, and an electromagnetic coupler. Specifically, the specific structures and the working flows of the primary winding, the primary controller, the secondary winding and the secondary controller can refer to the prior art, and the embodiment will not be further described.
In the embodiment of the present utility model, as shown in fig. 2, an electromagnetic coupler 22 is coupled between a primary side controller 23 and a secondary side controller 21. The electromagnetic coupler 22 may receive the control signal output from the secondary side controller 21, convert the control signal into a response signal, and output the response signal to the primary side controller 23. The primary side controller 23 controls the main power switching device M1 based on the received response signal.
In an embodiment of the present utility model, the electromagnetic coupler 22 may include: insulating plastic package, lead frame and electromagnetic coupler.
In a specific implementation, the lead frame may include a plurality of pins, where the pins are independent of each other and are not electrically connected. A portion of the pins of the leadframe may be coupled to a secondary side controller 21 of the power conversion circuit and another portion of the pins of the leadframe may be coupled to a primary side controller 23 of the power conversion circuit.
In a specific implementation, the plurality of pins of the lead frame may be obtained by stamping. Or a plurality of pins of the lead frame can be obtained by etching. It will be appreciated that there may be other ways to obtain multiple pins of the leadframe, not by way of example.
For any pin of the lead frame, part of the pin is encapsulated inside the insulating plastic package, and the other part of the pin is encapsulated outside the insulating plastic package. The pin portion encapsulated inside the insulating plastic package may be simply referred to as an internal pin, and the pin portion encapsulated outside the insulating plastic package may be simply referred to as an external pin.
The electromagnetic coupler may include a plurality of ports, and the number of ports of the electromagnetic coupler may be not less than the number of pins of the lead frame. For any pin, there is at least one electromagnetic coupler port coupled thereto; for any port of the electromagnetic coupler, there is at most one pin coupled thereto.
Specifically, the ports of the electromagnetic coupler may be connected to the internal pins of the corresponding pins through bonding materials, thereby achieving electrical connection with the corresponding pins. The bonding material can be a conductive material, and specifically can be copper wires, aluminum wires, gold wires and the like.
In some embodiments, the leadframe may be a single island leadframe. The island may be an extension of a certain pin of the lead frame into the lead frame. The electromagnetic coupler may be mounted on the base island, such as using an insulating glue, or otherwise mounted on the base island.
In other embodiments, the submount may also be independent of the leads in the leadframe, and the electromagnetic coupler may be mounted on the submount to connect with the internal leads of the corresponding leads via the bonding material, thereby making electrical connection with the corresponding leads.
In an embodiment of the present utility model, the lead frame may include a signal input pin, a signal output pin, a first ground pin, and a second ground pin, wherein: the signal input pin can be coupled with the secondary side controller and is used for inputting a control signal; the signal output pin can be coupled with the primary side controller and output a response signal; the first grounding pin is commonly grounded with the grounding pin of the secondary side controller, and the second grounding pin is commonly grounded with the grounding pin of the primary side controller.
In some embodiments, the leadframe may include one signal input pin, one signal output pin, one first ground pin, and one second ground pin.
It is understood that the number of the signal input pins, the signal output pins, the first ground pins, the second ground pins, and the like may not be limited to one but may be two or more.
In an embodiment of the present utility model, the electromagnetic coupler may be packaged in a package structure.
The embodiment of the utility model provides a packaging structure, which comprises: insulating plastic envelope, electromagnetic coupler and lead frame, wherein:
A lead frame extending to the outside of the insulating plastic package a plurality of mutually independent pins which are not electrically connected with each other;
Any one of the plurality of pins extends out of the first base island towards the inside of the lead frame;
an electromagnetic coupler is mounted on the first base island.
In implementations, the electromagnetic coupler may be a die of a semiconductor device.
In implementations, the electromagnetic coupler may include a plurality of ports, with corresponding ports having electrical connections with corresponding pins in the leadframe. The electromagnetic coupler may generate a response signal in response to the control signal output from the secondary side controller and output the response signal to the primary side controller.
Specifically, the electromagnetic coupler may convert the control signal output from the secondary side controller into a response signal based on the principle of electromagnetic induction.
In a specific implementation, the plurality of pins may include a signal input pin, a signal output pin, a first ground pin, and a second ground pin, wherein: the signal input pin can be coupled with the secondary side controller and is used for inputting a control signal; the signal output pin can be coupled with the primary side controller and output a response signal; the first ground pin may be common to the ground pin of the secondary side controller and the second ground pin may be common to the ground pin of the primary side controller.
Corresponding to the pins, the electromagnetic coupler may comprise four ports, wherein: the first port of the electromagnetic coupler is coupled with the signal input pin, the second port of the electromagnetic coupler is coupled with the first grounding pin, the third port of the electromagnetic coupler is coupled with the signal output pin, and the fourth port of the electromagnetic coupler is coupled with the second grounding pin.
The following describes the package structure provided in the embodiment of the present utility model in detail.
Referring to fig. 3, a schematic diagram of a package structure in an embodiment of the present utility model is provided.
In fig. 3, the lead frame includes four pins, i.e., pin 1, pin 2, pin 3 and pin 4, and the pin 2 extends out of the first base island toward the inside of the lead frame. The electromagnetic coupler 33 is mounted on the first base island, and the electromagnetic coupler 33 is packaged in the insulating plastic package 31. The electromagnetic coupler 33 includes four ports: a first port (hereinafter referred to as port 1), a second port (hereinafter referred to as port 2), a third port (hereinafter referred to as port 3), and a fourth port (hereinafter referred to as port 4).
The part of the pin 1 located inside the insulating plastic package 31 is provided with a welding spot, and the port 1 of the electromagnetic coupler 33 is electrically connected with the welding spot of the pin 1 through bonding materials. The part of the pin 2 located inside the insulating plastic package 31 is provided with a welding spot, and the port 2 of the electromagnetic coupler 33 is electrically connected with the welding spot of the pin 2 through bonding materials. The part of the pin 3 located inside the insulating plastic package 31 is provided with a welding spot, and the port 3 of the electromagnetic coupler 33 is electrically connected with the welding spot of the pin 3 through bonding materials. The part of the pin 4 located inside the insulating plastic package 31 is provided with a welding spot, and the port 4 of the electromagnetic coupler 33 is electrically connected with the welding spot of the pin 4 through bonding materials.
In a specific implementation, the secondary side controller and the electromagnetic coupler can be mutually independent, and the primary side controller and the electromagnetic coupler can also be mutually independent. That is, the secondary side controller, the electromagnetic coupler and the primary side controller may be three mutually independent devices, and occupy a certain circuit area on a circuit board where the power conversion circuit is located.
If the secondary side controller and the electromagnetic coupler are independently arranged, a larger circuit area is required to place the secondary side controller and the electromagnetic coupler respectively. In addition, the secondary side controller generally includes a signal output pin (a pin for outputting a control signal, which is connected to a signal input pin of the electromagnetic coupler), a feedback pin, and a ground pin, a power supply pin, and the electromagnetic coupler includes a signal input pin, a signal output pin (for outputting a signal corresponding to the control signal to the primary side controller), a first ground pin, and a second ground pin. Therefore, the total number of pins of the secondary side controller and the electromagnetic coupler is at least 8, the pins are more, and the pins also occupy larger circuit area.
In the embodiment of the utility model, in order to reduce the total number of pins and the circuit area of the secondary side controller and the electromagnetic coupler, the secondary side controller can be packaged in a packaging structure.
In a specific implementation, the package structure may employ a dual-island leadframe, i.e., the leadframe of the package structure includes two islands. For convenience of distinguishing, the two base islands are a first base island and a second base island respectively, the electromagnetic coupler is arranged on the first base island, and the secondary side controller is arranged on the second base island.
Specifically, a first island extends from one lead in the lead frame to the inside of the lead frame, and a second island extends from the other lead in the lead frame to the inside of the lead frame. The pins corresponding to the first base island are different from the pins corresponding to the second base island.
When the package structure includes the electromagnetic coupler and the secondary side controller, the lead frame of the package structure may include a feedback pin, a signal output pin, a first ground pin, a second ground pin, and a first power pin.
In a specific implementation, the secondary side controller may obtain the sampling voltage on the feedback pin, and further generate a corresponding control signal according to the sampling voltage. The first supply pin may be used to provide a first supply voltage for the secondary controller, which may be the output voltage VDD of the secondary winding.
Referring to fig. 4, a schematic diagram of another package structure in an embodiment of the present utility model is provided.
In fig. 4, a first ground pin (GND) of the package structure extends out of the first land toward the inside of the lead frame, and the electromagnetic coupler 33 is mounted on the first land. The feedback pin (FB) extends out of the second island to the interior of the leadframe, and the secondary side controller 34 is mounted on the second island.
The first port (port 1) of the secondary side controller 34 is coupled to the feedback pin (FB), the second port (port 2) of the secondary side controller 34 is coupled to the first power pin (VDD), the third port (port 3) of the secondary side controller 34 is coupled to the first ground pin (GND), and the fourth port (port 4) of the secondary side controller 34 is coupled to the first port (port 1) of the electromagnetic coupler 33.
The first port (port 1) of the electromagnetic coupler 33 is coupled to the fourth port (port 4) of the secondary side controller 34, the second port (port 2) of the electromagnetic coupler 33 is coupled to the first ground pin (GND), the third port (port 3) of the electromagnetic coupler 33 is coupled to the signal output pin (RE), and the fourth port (port 4) of the electromagnetic coupler 33 is coupled to the second ground Pin (PGND).
By integrating the electromagnetic coupler, the secondary side controller in the package structure, the package structure may include only one feedback pin, one signal output pin, one first ground pin, one second ground pin, and one first power pin. That is, the package structure may include only 5 pins, so that the circuit area occupied by the pins can be effectively reduced. In addition, as the secondary side controller and the electromagnetic coupler are packaged in the packaging structure, the integration level of the device is improved, and meanwhile, the circuit area can be further reduced.
In the embodiment of the utility model, the primary side controller can also be packaged in a packaging structure for reducing the circuit area.
In a specific implementation, the package structure may employ a dual-island leadframe, i.e., the leadframe of the package structure includes two islands. For convenience of distinguishing, the two base islands are a first base island and a second base island respectively, the electromagnetic coupler is arranged on the first base island, and the primary side controller is arranged on the third base island.
Specifically, a first island extends from one of the leads to the inside of the lead frame, and a third island extends from the other of the leads to the inside of the lead frame. The pins corresponding to the first base island are different from the pins corresponding to the third base island.
When the package structure includes the electromagnetic coupler and the primary side controller, the lead frame of the package structure may include an output pin, a signal input pin, a first ground pin, a second ground pin, and a second power pin.
In particular implementations, the output pin may be used to output a control signal to the main power switching device M1 in the primary winding to control the operating state of the main power switching device M1. The second power supply pin may be used to provide a power supply voltage for the primary side controller, which may be the output voltage of the primary side winding.
Referring to fig. 5, a schematic diagram of still another package structure in an embodiment of the present utility model is provided.
In fig. 5, a second ground Pin (PGND) extends toward the inside of the lead frame by a first land, and the electromagnetic coupler 33 is mounted on the first land. A second power supply pin (VCC) extends into the lead frame beyond a third island on which the primary side controller 35 is mounted.
In a specific implementation, the first port (port 1) of the primary side controller 35 is coupled to the second ground Pin (PGND), the second port (port 2) of the primary side controller 35 is coupled to the third port (port 3) of the electromagnetic coupler 33, the third port (port 3) of the primary side controller 35 is coupled to the second power pin (VCC), and the fourth port (port 4) of the primary side controller 35 is coupled to the output pin (OUT).
A first port (port 1) of the electromagnetic coupler 33 is coupled to the signal input pin (TR), a second port (port 2) of the electromagnetic coupler 33 is coupled to the first ground pin (GND), a third port (port 3) of the electromagnetic coupler 33 is coupled to the second port (port 2) of the primary side controller 35, and a fourth port (port 4) of the electromagnetic coupler 33 is coupled to the second ground Pin (PGND).
The electromagnetic coupler and the primary side controller are integrated in a packaging structure, and the packaging structure can only comprise one output pin, one signal input pin, one first grounding pin, one second grounding pin and one second power supply pin. That is, the package structure may include only 5 pins, so that the circuit area occupied by the pins can be effectively reduced. In addition, as the primary side controller and the electromagnetic coupler are packaged in the packaging structure, the integration level of the device is improved, and meanwhile, the circuit area can be further reduced.
In the embodiment of the utility model, in order to reduce the circuit area, the primary side controller and the secondary side controller can be packaged in a packaging structure.
In a specific implementation, the package structure may employ a three-island leadframe, i.e., the leadframe includes three islands. In order to facilitate distinguishing, the three base islands are a first base island, a second base island and a third base island respectively, the electromagnetic coupler is arranged on the first base island, the secondary side controller is arranged on the second base island, and the primary side controller is arranged on the third base island.
Specifically, a first land extends from one of the leads to the inside of the lead frame, a second land extends from the other of the leads to the inside of the lead frame, and a third land extends from the other of the leads to the inside of the lead frame. The pins corresponding to the first base island, the pins corresponding to the second base island and the pins corresponding to the third base island are different.
When the package structure includes an electromagnetic coupler, a primary side controller, and a secondary side controller, the lead frame of the package structure may include a feedback pin, an output pin, a first ground pin, a second ground pin, a first power pin, and a second power pin.
Referring to fig. 6, a schematic diagram of a package structure of still another electromagnetic coupler in an embodiment of the present utility model is given.
In fig. 6, the first ground pin (GND) extends toward the inside of the lead frame by a first land on which the electromagnetic coupler 33 is mounted. The feedback pin (FB) extends out of the second island to the interior of the leadframe, and the secondary side controller 34 is mounted on the second island. The second ground lead (PGND) extends into the lead frame beyond a third island on which the primary side controller 35 is mounted.
A first port (port 1) of the secondary side controller 34 is coupled to a feedback pin (FB) that inputs a sampled voltage of the output voltage of the secondary side winding; the second port (port 2) of the secondary side controller 34 is coupled to the first power supply pin (VDD), the third port (port 3) of the secondary side controller 34 is coupled to the first ground pin (GND), and the fourth port (port 4) of the secondary side controller 34 is coupled to the first port (port 1) of the electromagnetic coupler 33. The first power pin inputs the output voltage of the secondary winding.
The first port (port 1) of the primary side controller 35 is coupled to the third port (port 3) of the electromagnetic coupler 33, the second port (port 2) of the primary side controller 35 is coupled to the second ground Pin (PGND), the third port (port 3) of the primary side controller 35 is coupled to the second power pin (VCC), and the fourth port (port 4) of the primary side controller 35 is coupled to the output pin (OUT). The output pin (OUT) is coupled to a control terminal of a main power switching device in the power conversion circuit. The second power pin inputs the input voltage of the primary winding.
The first port (port 1) of the electromagnetic coupler 33 is coupled to the fourth port (port 4) of the secondary side controller 34, the second port (port 2) of the electromagnetic coupler 33 is coupled to the first ground pin (GND), the third port (port 3) of the electromagnetic coupler 33 is coupled to the first port (port 1) of the primary side controller 35, and the fourth port (port 4) of the electromagnetic coupler 33 is coupled to the second ground Pin (PGND).
The electromagnetic coupler, the primary side controller and the secondary side controller are packaged in a packaging structure, and the packaging structure can only comprise a feedback pin, an output pin, a first grounding pin, a second grounding pin, a first power supply pin and a second power supply pin. That is, the package structure obtained by integrating the electromagnetic coupler, the primary side controller and the secondary side controller can only comprise 6 pins, so that occupied circuit area can be effectively reduced, and the integration level of the device is improved.
In a specific implementation, the electromagnetic coupler may be a die of a semiconductor device. When the primary side controller is packaged in a package structure, the primary side controller may also be a die of a semiconductor device. Accordingly, when the secondary side controller is packaged in a package structure, the secondary side controller may also be a die of the semiconductor device. The electromagnetic coupler provided in the above-described embodiment of the present utility model will be described in detail.
In a specific implementation, the electromagnetic coupler may include a substrate, an insulating dielectric layer, a passivation layer, a first coil, and a second coil, wherein:
The first coil and the second coil are isolated from each other and form a communication link in a magnetic coupling manner;
The first terminal of the first coil is a first port of the electromagnetic coupler, and the second terminal of the first coil and a second port of the electromagnetic coupler;
The first terminal of the second coil is a third port of the electromagnetic coupler, and the second terminal of the second coil is a fourth port of the electromagnetic coupler;
An insulating medium layer is arranged on the substrate, a passivation layer is arranged on the insulating medium layer, and the first coil and the second coil are mutually isolated through the insulating medium layer.
In a specific implementation, the first coil and the second coil may be conductive coils, and the conductive coils may be metal coils such as copper coils and aluminum coils, or coils formed by other conductive materials.
In a specific implementation, the control signal generated by the secondary side controller is input to the first port of the electromagnetic coupler, so the control signal is input to the first coil of the electromagnetic coupler. According to the near-field electromagnetic induction principle, when an electric signal exists on the first coil, the second coil correspondingly generates an electric signal, and the electric signal generated on the second coil outputs a response signal through the signal output pin. Thus, the control signal generated by the secondary side controller is output to the primary side controller by means of electromagnetic induction.
According to the near-field electromagnetic induction principle, when an electric signal exists on the first coil, the second coil correspondingly generates an electric signal, and the electric signal generated on the second coil is output to the second port of the primary side controller. The primary side controller processes the electric signal generated on the second coil to obtain a response signal corresponding to the control signal, and outputs the response signal to the main power switch device M1 through the output pin. Thus, the control signal generated by the secondary side controller is output to the primary side controller through an electromagnetic induction mode.
In the embodiment of the utility model, the first coil and the second coil can be formed by a layer of spiral coil.
Referring to fig. 7, a schematic structural diagram of an electromagnetic coupler in an embodiment of the present utility model is given. The first coil 41 includes a terminal 1 (i.e., a first terminal of the first coil) and a terminal 2 (i.e., a second terminal of the first coil), and the second coil 42 may include a terminal 3 (i.e., a first terminal of the second coil) and a terminal 4 (i.e., a second terminal of the second coil).
In a specific implementation, the second coil may further include a third terminal, and the third terminal may be led out from a middle winding portion of the second coil. The second terminal of the second coil or the third terminal of the second coil is a fourth port of the electromagnetic coupler.
In some embodiments, the third terminal of the second coil may be located at a middle portion of the second coil, substantially equivalent to dividing the second coil into two smaller turns of the coil by the third terminal. The number of turns between the first terminal of the second coil and the third terminal of the second coil may not be equal to the number of turns between the third terminal of the second coil and the second terminal of the second coil. According to the electromagnetic coupler, the third terminal is added in the second coil, and different-precision control circuits can be compatible by changing pin connection.
Referring to fig. 8, a schematic structural diagram of another electromagnetic coupler in an embodiment of the present utility model is given. The first coil 41 includes a terminal 1 (i.e., a first terminal of the first coil) and a terminal 2 (i.e., a second terminal of the first coil), and the second coil 42 may include a terminal 3 (i.e., a first terminal of the second coil), a terminal 4 (i.e., a second terminal of the second coil), and a terminal 5 (i.e., a third terminal of the second coil).
In the embodiment of the present utility model, two terminals may be selected from the three terminals of the second coil 42 as the third port and the fourth port of the electromagnetic coupler according to specific application requirements.
In some embodiments, the first terminal of the second coil is selected as the third port of the electromagnetic coupler and the second terminal of the second coil is selected as the fourth port of the electromagnetic coupler. In other embodiments, the first terminal of the second coil is selected as the third port of the electromagnetic coupler and the third terminal of the second coil is selected as the fourth port of the electromagnetic coupler. In still other embodiments, the second terminal of the second coil is selected as the third port of the electromagnetic coupler and the third terminal of the second coil is selected as the fourth port of the electromagnetic coupler.
Referring to fig. 9, a schematic diagram of another package structure in an embodiment of the present utility model is provided. Referring to fig. 9, in the electromagnetic coupler 33, the terminal 1 is a first terminal of a first coil (i.e., a first port of the electromagnetic coupler 33), the terminal 2 is a second terminal of a second coil (i.e., a second port of the electromagnetic coupler 33), and the terminal 4 is a second terminal of the second coil (i.e., a fourth port of the electromagnetic coupler 33). The terminal 3 and the terminal 5 are optional terminals, and when either one of them is selected, the selected terminal is the third port of the electromagnetic coupler 33.
As described above, the electromagnetic coupler operates on the principle of electromagnetic coupling between the first coil and the second coil in the electromagnetic coupler. When an electric signal is input to the first coil, the current on the first coil changes, and the second coil is influenced through mutual inductance, so that induced current is generated on the second coil.
Referring to fig. 10, a schematic diagram of current waveforms of a first coil and a second coil in an embodiment of the present utility model is provided.
In fig. 10, the third port of the electromagnetic coupler is the first terminal of the second coil, and the fourth port of the electromagnetic coupler is the second terminal of the second coil.
At time t1, the current I 0 on the first coil changes, and accordingly, the second coil generates an induced current I 1 corresponding to the control signal; at time t2, the current I 0 on the first coil reaches a maximum value, and correspondingly, the induced current I 1 on the second coil also reaches a maximum value, and then gradually decreases. When the current I 0 on the first coil becomes 0, the induced current I 1 on the second coil also correspondingly becomes 0.
It can be seen that the control signal is input to the electromagnetic coupler, essentially to the first coil. When the current I 0 on the first coil changes, the second coil generates an induced current I 1 corresponding to the control signal. The current I 0 on the first coil is the current corresponding to the control signal, and the induced current I 1 on the second coil is the current corresponding to the induced signal. Therefore, the control signal is transmitted from the secondary side controller to the primary side controller through a near-field electromagnetic induction mode.
Referring to fig. 11, a schematic diagram of current waveforms of another first coil and a second coil in an embodiment of the present utility model is provided.
In fig. 11, when the first terminal and the second terminal of the second coil are selected as two ports of the magnetic induction chip, the induced current on the second coil is the induced current I 1. When the second terminal and the third terminal on the second coil are selected as two ports of the magnetic induction chip, the induction current on the second coil is I 2.
It can be seen that the more turns of the second coil, the greater the corresponding induced current.
That is, if the detection accuracy requirement on the primary side controller is high, the second terminal and the third terminal of the second coil may be selected as the third port and the fourth port of the electromagnetic coupler; conversely, if the detection accuracy requirement on the primary side controller is low, the first terminal and the second terminal of the second coil may be selected as the third port and the fourth port of the electromagnetic coupler.
In a specific implementation, the insulating dielectric layer may include a plurality of portions stacked. The first coil and the second coil may be disposed in the same portion of the insulating medium layer, or may be disposed in different portions of the insulating medium layer. The first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil may be disposed in the same portion of the insulating medium layer, or may be disposed in different portions of the insulating medium layer.
For example, the first terminal of the first coil, the second terminal of the first coil are disposed in the second portion of the insulating medium layer, and the first terminal of the second coil, the second terminal of the second coil are disposed in the third portion of the insulating medium layer. For another example, the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are all disposed in the second portion of the insulating medium layer.
In a specific implementation, the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil may be disposed in a space in the insulating medium layer.
In some embodiments, the first terminal of the first coil and the second terminal of the first coil may be disposed at an edge position near a portion of the insulating medium layer, and the first terminal of the second coil and the second terminal of the second coil may be disposed at another edge position near the portion of the insulating medium layer.
Referring to fig. 12, a top view of an electromagnetic coupler in an embodiment of the utility model is shown. Referring to fig. 13, a schematic A-A cross-section of the electromagnetic coupler provided in fig. 12 is shown.
In fig. 13, a passivation layer 131, an insulating dielectric layer 132 and a substrate 133 are sequentially disposed from top to bottom in a vertical direction, wherein the insulating dielectric layer 132 includes a first portion 132 (a), a second portion 132 (b), a third portion 132 (c) and a fourth portion 132 (d).
The first coil 41 is disposed in the first portion 132 (a) of the insulating dielectric layer 132, the second coil 42 is disposed in the third portion 132 (c) of the insulating dielectric layer 132, the first terminal (terminal 1 is shielded by terminal 2 and therefore not shown in fig. 13) and the second terminal (terminal 2) of the first coil 41 are disposed in the second portion 132 (b) of the insulating dielectric layer 132, and the first terminal (terminal 3) and the second terminal (terminal 4 are shielded by terminal 3 and therefore not shown in fig. 13) of the second coil are disposed in the second portion 132 (b) of the insulating dielectric layer 132.
In some embodiments, the insulating dielectric layer may be silicon oxide. In other embodiments, the insulating layer may be made of other types of insulating materials such as high density polyethylene, tetraethoxysilane, and the like.
In the embodiment of the present utility model, the first coil may also be formed of a multi-layer spiral coil.
In a specific implementation, the insulating dielectric layer includes a plurality of portions stacked. Different layers of spiral coils and second coils of the first coil are respectively arranged in different parts of the insulating medium layer.
In particular, a first layer of spiral coils of the first coil may be disposed in a portion near the passivation layer, a second layer of spiral coils of the first coil may be disposed in an intermediate portion of the insulating dielectric layer, and a second coil may be disposed in a portion near the substrate.
The first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil may be disposed in the same portion of the insulating medium layer, or may be disposed in different portions of the insulating medium layer. The first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil may be disposed in the insulating medium layer at intervals. The center position of the first layer spiral coil of the first coil is connected with the center position of the second layer spiral coil through a wire.
Referring to fig. 14, a side view of another electromagnetic coupler in an embodiment of the utility model is presented. Referring to fig. 15, a top view of the electromagnetic coupler provided in fig. 14 is provided. Referring to fig. 16, a schematic B-B cross-sectional view of the electromagnetic coupler provided in fig. 14 is provided.
In practical use, the electromagnetic coupler shown in fig. 14 is provided because the smaller spacing between the upper and lower coils may cause difficulty in drawing out the ports after the coils are wound to the center position.
In fig. 14, the first coil includes a first layer spiral coil 411 and a second layer spiral coil 412. After the first layer of spiral coils 411 is wound to the center position, one layer of spiral coils (i.e., the second layer of spiral coils 412) is further formed. The second layer of spiral coils 412 are wound outwards from the central position, and the winding direction is in phase with that of the first layer of spiral coils 411, so that the port can be led out more conveniently.
In fig. 16, a passivation layer 151, an insulating dielectric layer 152, and a substrate 153 are sequentially disposed from top to bottom in the vertical direction. The insulating dielectric layer 152 includes a first portion 152 (a), a second portion 152 (b), a third portion 152 (c), a fourth portion 152 (d), a fifth portion 152 (e), and a sixth portion 152 (f).
The first coil 41 includes a first layer spiral coil 411 and a second layer spiral coil 412. The first layer spiral coil 411 is disposed in the first portion 152 (a) of the insulating dielectric layer 152, and the second layer spiral coil 412 is disposed in the third portion 152 (c) of the insulating dielectric layer 152. The second coil 42 is disposed in a fifth portion 152 (e) of the insulating dielectric layer 152.
The first terminal (terminal 1 is shielded by terminal 2 and therefore not shown in fig. 15) and the second terminal (terminal 2) of the first coil 41 are provided in the first portion 152 (a), the second portion 152 (b), and the third portion 152 (c) of the insulating medium layer 152, and the first terminal (terminal 3) and the second terminal (terminal 4 are shielded by terminal 3 and therefore not shown in fig. 15) of the second coil 42 are provided in the third portion 152 (c), the fourth portion 152 (d), and the fifth portion 152 (e) of the insulating medium layer 152.
In the embodiment of the utility model, the first coil and the second coil can also form a nested structure, and the first coil and the second coil are in the same plane in space, so that the thickness of the electromagnetic coupler can be reduced, and the cost is saved and the installation is convenient.
Referring to fig. 17, a front view of yet another electromagnetic coupler in an embodiment of the present utility model is given. Referring to fig. 18, a schematic C-C cross-section of the electromagnetic coupler provided in fig. 17 is provided.
In fig. 17, the first coil and the second coil are both spiral and nested with each other, and an insulating material is filled between the first coil and the second coil. In fig. 17, one port of the first coil is in the central region of the nested structure and the other port is outside the nested structure. Accordingly, one port of the second coil is in the central region of the nested structure and the other port is outside of the nested structure.
In fig. 18, a passivation layer 171, an insulating dielectric layer 172, and a substrate 173 are sequentially formed from top to bottom in the vertical direction. The insulating dielectric layer 172 includes a first portion 172 (a) and a second portion 172 (b).
The first coil 41, the first terminal of the first coil (terminal 1 is shielded by terminal 2 and is therefore shown in fig. 18), the second terminal of the first coil (terminal 2), the second coil (42), the first terminal of the second coil (terminal 3), and the second terminal of the second coil (terminal 4 is shielded by terminal 3 and is therefore not shown in fig. 18) may be provided in the first portion 172 (a) of the insulating medium layer.
Specifically, the first terminal (terminal 1) of the first coil and the first terminal (terminal 3) of the second coil are located at a central position of the first portion 172 (a) of the insulating medium layer 172 and are disposed at intervals, the second terminal (terminal 2) of the first coil is located at an edge position near the first portion 172 (a) of the insulating medium layer 172, and the second terminal (terminal 4) of the second coil is located at another edge position near the first portion 172 (a) of the insulating medium layer 172.
Those skilled in the art will appreciate that the specific structure of the electromagnetic coupler is not limited to that described in the above examples. In a specific application, the corresponding electromagnetic coupler may be selected according to a specific scenario, which will not be described here too much.
The embodiment of the utility model also provides another power conversion circuit, which comprises the packaging structure provided by any embodiment; and/or including an electromagnetic coupler provided by any of the embodiments described above.
Although the present utility model is disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.
Claims (22)
1. A package structure, comprising: insulating plastic package, electromagnetic coupler and lead frame;
The lead frame extends to the outside of the insulating plastic package to form a plurality of mutually independent pins which are not electrically connected with each other;
Any one of the plurality of pins extends out of the first base island towards the inside of the lead frame;
the electromagnetic coupler is mounted on the first base island.
2. The package structure of claim 1, wherein the electromagnetic coupler is a die of a semiconductor device.
3. The package structure of claim 1, wherein the electromagnetic coupler comprises a plurality of ports, the corresponding ports are electrically connected with corresponding pins in the lead frame, and the corresponding ports generate response signals in response to control signals output by the secondary side controller and output the response signals to the primary side controller; the response signal is obtained by electromagnetic induction based on the control signal.
4. The package structure of claim 3, wherein the plurality of pins includes a signal input pin, a signal output pin, a first ground pin, and a second ground pin; the signal input pin is coupled with the secondary side controller and inputs the control signal; the signal output pin is coupled with the primary side controller and outputs the response signal; the first grounding pin is commonly grounded with the grounding pin of the secondary side controller, and the second grounding pin is commonly grounded with the grounding pin of the primary side controller.
5. The package structure of claim 4, wherein the electromagnetic coupler comprises a first port, a second port, a third port, and a fourth port;
The first port of the electromagnetic coupler is coupled with the signal input pin, the second port of the electromagnetic coupler is coupled with the first grounding pin, the third port of the electromagnetic coupler is coupled with the signal output pin, and the fourth port of the electromagnetic coupler is coupled with the second grounding pin.
6. The package structure of claim 3, further comprising: any one of a plurality of pins different from the pins from which the first base island extends inward extends toward the inside of the lead frame, and the secondary side controller is mounted on the second base island.
7. The package structure of claim 6, wherein the plurality of pins includes a feedback pin, a signal output pin, a first power pin, a first ground pin, and a second ground pin; the signal output pin is coupled with the primary side controller and outputs the response signal; the feedback pin inputs the sampling voltage of the output voltage of the secondary winding, and the first power supply pin inputs the output voltage of the secondary winding;
The first port of the secondary side controller is coupled with the feedback pin, the second port of the secondary side controller is coupled with the first power pin, the third port of the secondary side controller is coupled with the first grounding pin, and the fourth port of the secondary side controller is coupled with the first port of the electromagnetic coupler;
the second port of the electromagnetic coupler is coupled with the first grounding pin, the third port of the electromagnetic coupler is coupled with the signal output pin, and the fourth port of the electromagnetic coupler is coupled with the second grounding pin.
8. The package structure of claim 3, further comprising: any one of a plurality of pins different from the pins from which the first base island extends inward extends toward the inside of the lead frame, and a third base island on which the primary side controller is mounted.
9. The package structure of claim 8, wherein the leadframe includes a signal input pin, an output pin, a second power pin, a first ground pin, and a second ground pin; the signal input pin is coupled with the secondary side controller and inputs the control signal; the output pin is coupled with the control end of a main power switch device in the power conversion circuit; the second power supply pin inputs the input voltage of the primary winding;
the first port of the primary side controller is coupled with the second grounding pin, the second port of the primary side controller is coupled with the third port of the electromagnetic coupler, the third port of the primary side controller is coupled with the second power pin, and the fourth port of the primary side controller is coupled with the output pin;
The first port of the electromagnetic coupler is coupled with the signal input pin, the second port of the electromagnetic coupler is coupled with the first grounding pin, and the fourth port of the electromagnetic coupler is coupled with the second grounding pin.
10. The package structure of claim 3, wherein any two different pins of the plurality of pins different from the pins from which the first island extends inward extend out of the second island and a third island, respectively, toward the interior of the leadframe, the secondary side controller being mounted on the second island; the primary side controller is mounted on the third base island.
11. The package structure of claim 10, wherein the leadframe includes a feedback pin, an output pin, a first power pin, a second power pin, a first ground pin, and a second ground pin; the feedback pin inputs the sampling voltage of the output voltage of the secondary winding, the output pin is coupled with the control end of a main power switch device in the power conversion circuit, the first power pin inputs the output voltage of the secondary winding, and the second power pin inputs the input voltage of the primary winding;
The first port of the secondary side controller is coupled with the feedback pin, the second port of the secondary side controller is coupled with the first power pin, the third port of the secondary side controller is coupled with the first grounding pin, and the fourth port of the secondary side controller is coupled with the first port of the electromagnetic coupler;
the second port of the primary side controller is coupled with the second grounding pin, the first port of the primary side controller is coupled with the third port of the electromagnetic coupler, the third port of the primary side controller is coupled with the second power pin, and the fourth port of the primary side controller is coupled with the output pin;
The second port of the electromagnetic coupler is coupled with the first ground pin, and the fourth port of the electromagnetic coupler is coupled with the second ground pin.
12. The package structure according to any one of claims 1 to 11, wherein the electromagnetic coupler includes: the device comprises a substrate, an insulating medium layer, a passivation layer, a first coil and a second coil; the first coil and the second coil are isolated from each other and magnetically coupled to form a communication link; the first terminal of the first coil is a first port of the electromagnetic coupler, and the second terminal of the first coil is a second port of the electromagnetic coupler; the first terminal of the second coil is a third port of the electromagnetic coupler, and the second terminal of the second coil is a fourth port of the electromagnetic coupler; the substrate is provided with the insulating medium layer, the insulating medium layer is provided with the passivation layer, and the first coil and the second coil are mutually isolated through the insulating medium layer.
13. The package structure of claim 12, wherein the second coil further comprises a third terminal; the third terminal is led out from the middle winding part of the second coil; the second terminal of the second coil or the third terminal of the second coil replaces the second terminal of the second coil as the fourth port of the electromagnetic coupler.
14. The package structure of claim 13, wherein the first coil is spiral in shape and the second coil is spiral in shape.
15. The package structure of claim 14, wherein the first coil and the second coil are each comprised of a layer of spiral coils.
16. The package structure of claim 15, wherein the first coil and the second coil are both disposed in the insulating dielectric layer, the first coil is disposed in a first portion of the insulating dielectric layer, the second coil is disposed in a third portion of the insulating dielectric layer, and the first portion, the second portion, the third portion, and the fourth portion of the insulating dielectric layer are sequentially included between the passivation layer and the substrate;
The first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the same or different portions of the insulating medium layer, the first terminal of the first coil and the second terminal of the first coil are located near the edge of the insulating medium layer, the first terminal of the second coil and the second terminal of the second coil are located near the other edge of the insulating medium layer, and the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the middle of the insulating medium layer.
17. The package structure of claim 14, wherein the first coil is formed of a multi-layer spiral coil.
18. The package structure of claim 17, wherein different layers of spiral coils of the first coil are disposed in a first portion of the insulating dielectric layer and a third portion of the insulating dielectric layer, respectively, and the second coil is disposed in a fifth portion of the insulating dielectric layer, including the first portion, the second portion, the third portion, the fourth portion, the fifth portion, and the sixth portion of the insulating dielectric layer in order between the passivation layer and the substrate;
The first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the same or different portions of the insulating medium layer, the first terminal of the first coil and the second terminal of the first coil are located near the edge of the insulating medium layer, the first terminal of the second coil and the second terminal of the second coil are located near the other edge of the insulating medium layer, and the first terminal of the first coil, the second terminal of the first coil, the first terminal of the second coil, and the second terminal of the second coil are disposed in the middle of the insulating medium layer;
The central position of the first layer spiral coil of the first coil is connected with the central position of the second layer spiral coil of the first coil in the insulating medium layer.
19. The package structure of claim 14, wherein the first coil and the second coil form a nested structure.
20. The package structure of claim 19, wherein the first coil, the first terminal of the first coil, the second coil, the first terminal of the second coil, and the second terminal of the second coil are all disposed in the insulating medium layer;
The first terminal of the first coil and the first terminal of the second coil are arranged at the center position in the insulating medium layer at intervals, the second terminal of the first coil is arranged at a position close to the edge of the insulating medium layer, and the second terminal of the second coil is arranged at a position close to the other edge of the insulating medium layer.
21. A power conversion circuit, comprising: rectifier bridge, primary winding, primary side controller, secondary winding, secondary side controller, main power switching device and electromagnetic coupler, wherein:
The input end of the rectifier bridge inputs alternating current, the output end of the rectifier bridge outputs direct current corresponding to the alternating current, and the rectifier bridge is suitable for rectifying the input alternating current into direct current;
The primary winding is coupled with the output end of the rectifier bridge at a first end and coupled with the first end of the main power switch device at a second end;
The primary side controller is coupled with the output end of the rectifier bridge at the power end, the input end of the primary side controller is coupled with the output end of the electromagnetic coupler, and the output end of the primary side controller is coupled with the control end of the main power switch device;
The first end of the secondary winding is coupled with the power end of the secondary controller, and the second end of the secondary winding is grounded;
The input end of the secondary side controller is coupled with the first end of the secondary side winding, and the output end of the secondary side controller is coupled with the input end of the electromagnetic coupler;
the second end of the main power switch device is grounded;
The lead frame of the electromagnetic coupler extends to the outside of the insulating plastic package to form a plurality of mutually independent pins which are not electrically connected with each other; a first lead of the plurality of leads extends out of a first base island towards the inside of the lead frame; the electromagnetic coupler is mounted on the first base island.
22. A power conversion circuit, comprising: rectifier bridge, primary winding, primary controller, secondary winding, secondary controller, primary power switching device and electromagnetic coupler, and package structure as claimed in any one of claims 1 to 20, wherein:
The input end of the rectifier bridge inputs alternating current, the output end of the rectifier bridge outputs direct current corresponding to the alternating current, and the rectifier bridge is suitable for rectifying the input alternating current into direct current;
The primary winding is coupled with the output end of the rectifier bridge at a first end and coupled with the first end of the main power switch device at a second end;
The primary side controller is coupled with the output end of the rectifier bridge at the power end, the input end of the primary side controller is coupled with the output end of the electromagnetic coupler, and the output end of the primary side controller is coupled with the control end of the main power switch device;
The first end of the secondary winding is coupled with the power end of the secondary controller, and the second end of the secondary winding is grounded;
The input end of the secondary side controller is coupled with the first end of the secondary side winding, and the output end of the secondary side controller is coupled with the input end of the electromagnetic coupler;
the second end of the main power switch device is grounded;
The lead frame of the electromagnetic coupler extends to the outside of the insulating plastic package to form a plurality of mutually independent pins which are not electrically connected with each other; a first lead of the plurality of leads extends out of a first base island towards the inside of the lead frame; the electromagnetic coupler is mounted on the first base island.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322441278.XU CN221150004U (en) | 2023-09-07 | 2023-09-07 | Package structure and power conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322441278.XU CN221150004U (en) | 2023-09-07 | 2023-09-07 | Package structure and power conversion circuit |
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| CN221150004U true CN221150004U (en) | 2024-06-14 |
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| CN202322441278.XU Active CN221150004U (en) | 2023-09-07 | 2023-09-07 | Package structure and power conversion circuit |
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| CN (1) | CN221150004U (en) |
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