Power conversion device

Abstract

The utility model provides a power supply conversion device which has a high voltage requirement and a small size. The power conversion device comprises a power switch circuit and a control circuit. The power switch circuit comprises a power switch and a cascade switch. The power switch is implemented by a depletion type gallium nitride (GaN) field effect transistor. The first end of the power switch is coupled to the high-voltage end of the power conversion device. The first end of the cascade switch is coupled to the second end of the power switch. The control circuit is coupled to the power switch circuit. The control circuit and the cascade switch are integrated in the first die. A power switch is integrated in the second die. The voltage endurance capability of the second crystal grains is higher than the voltage endurance capability of the first crystal grains.

Description

Technical Field

[0001] The utility model relates to a power conversion device, in particular to a power conversion device with high voltage resistance. Background Art

[0002] The current power conversion device can convert AC power into output power. Generally speaking, the power conversion device includes a power switch and a control circuit. The power conversion device uses the switching operation of the power switch to perform the power conversion operation of the power conversion device. In the design applied to high voltage (e.g., greater than 600 volts), the control circuit is integrated (or packaged) in a die that meets the low voltage withstand capability. The power switch must be integrated in a die that meets the high voltage withstand capability. Based on the above design, the power switch can be implemented by a depletion type gallium nitride (GaN) field effect transistor. Therefore, the power conversion device can use another switch to control the switching operation of the power switch. This switch is integrated in other dies. Therefore, the power conversion device includes three dies with different processes.

[0003] It should be noted that multiple connection lines are required between the dies. Therefore, the more dies there are, the larger the volume of the power conversion device. Under the design requirements with low volume, the power conversion device cannot accommodate three dies. Therefore, under the requirements of high voltage, how to reduce the number of dies or reduce the volume of the power conversion device is one of the research focuses of those skilled in the art. Utility Model Content

[0004] The utility model provides a power conversion device with high voltage requirement and small volume.

[0005] The power conversion device of the utility model includes a power switch circuit and a control circuit. The power switch circuit includes a power switch and a cascade switch. The power switch is implemented by a depletion type gallium nitride (GaN) field effect transistor. The first end of the power switch is coupled to the high voltage end of the power conversion device. The first end of the cascade switch is coupled to the second end of the power switch. The control circuit is coupled to the power switch circuit. The control circuit and the cascade switch are integrated in a first crystal grain. The power switch is integrated in a second crystal grain. The voltage resistance of the second crystal grain is higher than the voltage resistance of the first crystal grain.

[0006] In an embodiment of the present invention, the cascade switch is implemented by an enhancement mode field effect transistor.

[0007] In an embodiment of the present invention, the second terminal of the cascade switch is coupled to the control terminal of the power switch, and the control terminal of the cascade switch is coupled to the control circuit.

[0008] In an embodiment of the present invention, the control circuit generates a control signal and provides the control signal to a control terminal of the cascade switch.

[0009] In an embodiment of the present invention, the cascade switch performs a switching operation of the power switch circuit in response to a duty cycle of the control signal.

[0010] In one embodiment of the utility model, the power conversion device further includes a safety capacitor and a charge-discharge control circuit. The safety capacitor is coupled to the first end of the power switch. The charge-discharge control circuit includes a discharge circuit. The discharge circuit is coupled to the second end of the power switch and the control circuit. The discharge circuit performs a discharge operation on the voltage value at the safety capacitor. The discharge circuit is integrated in the first die.

[0011] In one embodiment of the utility model, the charge and discharge control circuit further includes a charging circuit. The charging circuit is coupled to the second end of the power switch and the control circuit. The charging circuit performs a charging operation on the voltage value of the safety capacitor. The charging circuit is integrated in the first die.

[0012] In an embodiment of the present invention, a control terminal of the power switch is coupled to the control circuit, and a control terminal of the cascade switch receives an enable signal.

[0013] In an embodiment of the present invention, the control circuit generates a control signal and an enable signal, and provides the enable signal to a control terminal of the cascade switch.

[0014] In one embodiment of the present invention, the cascade switch is turned on in response to an enable signal, and the power switch performs a switching operation of the power switch circuit in response to a control signal.

[0015] Based on the above, the power conversion device includes a power switching circuit and a control circuit. The power switching circuit includes a power switch and a cascade switch. The control circuit and the cascade switch are integrated in a first die. The power switch is integrated in a second die. The voltage resistance of the second die is higher than that of the first die. The second die is produced by a process rule that complies with a high voltage resistance. The first die is produced by a process rule that complies with a low voltage resistance. Therefore, the charge and discharge control circuit of the utility model does not need to be integrated in an additional die. The number of die in the power conversion device can be reduced. In this way, under the demand for high voltage, the volume of the power conversion device can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a power conversion device according to an embodiment of the utility model;

[0017] Figure 2 is a circuit diagram of a power switch circuit according to an embodiment of the present utility model;

[0018] Figure 3 is a circuit diagram of a power switch circuit according to an embodiment of the present utility model;

[0019] Figure 4 is a schematic diagram of a die layout of a power conversion device according to an embodiment of the utility model;

[0020] Figure 5 is a schematic diagram of a die layout of a power conversion device according to an embodiment of the utility model;

[0021] Figure 6 is a schematic diagram of a die layout of a power conversion device according to an embodiment of the utility model;

[0022] Figure 7 is a schematic diagram of a die layout of a power conversion device according to an embodiment of the utility model;

[0023] Figure 8 is a schematic diagram of a power conversion device according to an embodiment of the utility model;

[0024] Fig. 9 FIG. 1 is a schematic diagram of a die layout of a power conversion device according to an embodiment of the present invention.

[0025] Description of Reference Numerals

[0026] 100, 200: Power conversion device

[0027] 110: Power switch circuit

[0028] 120: Control circuit

[0029] 230: Charge and discharge control circuit

[0030] 231: Discharge circuit

[0031] 232: Charging circuit

[0032] CVCC: Capacitor

[0033] CX: Safety capacitor

[0034] DIE1: First Die

[0035] DIE2: Second Die

[0036] EN:Enable signal

[0037] HBUS: High voltage end

[0038] L1, L2: Electrical connection structure

[0039] PD1_1~PD1_5、PD2_1~PD2_9:Foot pads

[0040] PN1~PN9: Pins

[0041] RG1, RG2: Region

[0042] SC, SCC, SCD: control signals

[0043] SWC: Cascade Switch

[0044] SWP: Power Switch

[0045] TC: Conversion Circuit

[0046] VIN: Input power

[0047] VOUT: Output power DETAILED DESCRIPTION

[0048] Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The component symbols cited in the following description will be regarded as the same or similar components when the same component symbols appear in different drawings. These embodiments are only part of the present invention and do not disclose all possible implementation methods of the present invention. More specifically, these embodiments are only examples in the patent claims of the present invention.

[0049] Please refer to Figure 1 , Figure 1 1 is a schematic diagram of a power conversion device according to an embodiment of the present utility model. In this embodiment, the power conversion device 100 includes a power switch circuit 110 and a control circuit 120. The power switch circuit 110 includes a power switch SWP and a cascade switch SWC. The power switch SWP is implemented by a depletion type gallium nitride (GaN) field effect transistor. The first end of the power switch SWP is coupled to the high voltage end HBUS of the power conversion device 100. The first end of the cascade switch SWC is coupled to the second end of the power switch SWP. In other words, the power switch SWP and the cascade switch SWC are connected in series in a cascode manner. In this embodiment, the control circuit 120 is coupled to the power switch circuit 110. The control circuit 120 can use the control signal SC to control the switching operation of the power switch circuit 110.

[0050] For example, the power switch circuit 110 is disposed in the conversion circuit TC. (However, the present invention is not limited thereto). The power switch SWP receives the input power VIN through the high voltage terminal HBUS. Therefore, the conversion circuit TC can receive the input power VIN through the high voltage terminal HBUS and convert the input power VIN into the output power VOUT. The power conversion device 100 can be any type of power converter known to those skilled in the art.

[0051] For another example, the power switch circuit 110 further includes a rectifier circuit (not shown). The power switch SWP is coupled to the rectifier circuit via the high voltage terminal HBUS (but the present invention is not limited thereto). Therefore, the conversion circuit TC can receive the rectified power from the rectifier circuit via the high voltage terminal HBUS and convert the rectified power into the output power VOUT.

[0052] In this embodiment, the control circuit 120 and the cascade switch SWC are integrated or packaged in the first die DIE1. The power switch SWP is integrated or packaged in the second die DIE2. The voltage resistance of the second die DIE2 is higher than that of the first die DIE1. Therefore, the power switch SWP has a higher voltage tolerance. For example, the power switch SWP can withstand a voltage difference greater than 600 volts.

[0053] In the present embodiment, the first die DIE1 is produced by a process rule that complies with low voltage withstand capability. The second die DIE2 is produced by a process rule that complies with high voltage withstand capability. It is worth mentioning here that the power switch SWP is integrated in the second die DIE2. The power switch SWP withstands a larger voltage difference. Therefore, the voltage withstand capability of the cascade switch SWC can be allowed to be reduced. The control circuit 120 and the cascade switch SWC are integrated in the first die DIE1. Therefore, the cascade switch SWC of the utility model does not need to be integrated in an additional die. The number of die in the power conversion device 100 can be reduced. In this way, under the demand for high voltage, the volume of the power conversion device 100 can be reduced.

[0054] Please refer to Figure 1 as well as Figure 2 , Figure 21 is a circuit diagram of a power switch circuit according to an embodiment of the present invention. In this embodiment, the power switch SWP is implemented by a depletion-type GaN field effect transistor. The cascade switch SWC is implemented by an enhancement-type field effect transistor. The first end of the power switch SWP is coupled to the high-voltage end HBUS of the power conversion device 100. The first end of the cascade switch SWC is coupled to the second end of the power switch SWP. The second end of the cascade switch SWC is coupled to the control end of the power switch SWP. The control end of the cascade switch SWC is coupled to the control circuit 120.

[0055] In this embodiment, the second terminal of the cascade switch SWC is coupled to the low voltage terminal (not shown) of the power conversion device 100 .

[0056] In this embodiment, the control circuit 120 generates a control signal SC. The control circuit 120 provides the control signal SC to the control terminal of the cascade switch SWC. The control signal SC may be a pulse-width modulation (PWM) signal having a duty cycle. Therefore, the cascade switch SWC performs a switching operation of the power switch circuit 110 in response to the duty cycle of the control signal SC.

[0057] In this embodiment, the cascade switch SWC is implemented by an N-type enhancement type field effect transistor. Therefore, the control signal SC has a positive pulse. The high voltage value of the positive pulse is, for example, 12 volts, but the present invention is not limited thereto.

[0058] Please refer to Figure 1 as well as Figure 3 , Figure 3 1 is a circuit diagram of a power switch circuit according to an embodiment of the present invention. In this embodiment, the power switch SWP is implemented by a depletion-type GaN field-effect transistor. The cascade switch SWC is implemented by an enhancement-type field-effect transistor. The first end of the power switch SWP is coupled to the high-voltage end HBUS of the power conversion device 100. The first end of the cascade switch SWC is coupled to the second end of the power switch SWP. The control end of the power switch SWP is coupled to the control circuit 120. The control end of the cascade switch SWC is coupled to the control circuit 120.

[0059] The second terminal of the cascade switch SWC is coupled to the low voltage terminal (not shown) of the power conversion device 100 .

[0060] In this embodiment, the control circuit 120 generates a control signal SC. The control circuit 120 provides the control signal SC to the control terminal of the power switch SWP. The cascade switch SWC is turned on in response to the enable signal EN. The control signal SC may be a pulse width modulation signal with a duty cycle. Therefore, the power switch SWP performs a switching operation of the power switch circuit 110 in response to the control signal SC.

[0061] In some embodiments, the enable signal EN may be provided by the control circuit 120 .

[0062] In this embodiment, the cascade switch SWC is implemented by an N-type enhancement field effect transistor. Therefore, the voltage value of the enable signal EN is a positive voltage value. The control signal SC has a negative pulse. The low voltage value of the negative pulse is, for example, -14 volts, but the utility model is not limited thereto.

[0063] Please refer to Figure 1 as well as Figure 4 , Figure 4 FIG. 1 is a schematic diagram of a die layout of a power conversion device according to an embodiment of the present utility model. In this embodiment, the die layout of this embodiment can be applied to Figure 2 The power switch circuit 110 shown. The first die DIE1 and the second die DIE2 are packaged in a circuit assembly. The first die DIE1 includes a control circuit 120 and a cascade switch SWC. That is, the control circuit 120 and the cascade switch SWC are respectively integrated in the first die DIE1. Further, the control circuit 120 is integrated in the region RG1 of the first die DIE1. The cascade switch SWC is integrated in the region RG2 of the first die DIE1.

[0064] The second die DIE2 includes a power switch SWP. That is, the power switch SWP is integrated in the second die DIE2.

[0065] In this embodiment, the first die DIE1 at least includes pads PD1_1 and PD1_2. The second die DIE2 at least includes pads PD2_1 to PD2_9. The first end of the power switch SWP is coupled to the high voltage end HBUS through at least one of the pads PD2_1 to PD2_4 and at least one of the pins PN1 to PN4 of the circuit component. The second end of the power switch SWP is coupled to the first end of the cascade switch SWC through at least one of the pads PD2_5 to PD2_8 and the pad PD1_1. The second end of the cascade switch SWC is coupled to at least one of the pins PN5 to PN8 of the circuit component through the pad PD1_2. In addition, the second end of the cascade switch SWC is also coupled to the control end of the power switch SWP through the pads PD1_2 and the pad PD2_9.

[0066] In the first die DIE1, the control circuit 120 can provide the control signal SC to the control end of the cascade switch SWC through the electrical connection structure L1 in the first die DIE1. The control circuit 120 does not need to provide the control signal SC through additional pads and bonding wires. The cascade switch SWC and the control circuit 120 are highly integrated in the circuit assembly. Therefore, the parasitic inductance, parasitic capacitance and resistance value generated by the bonding wire can be ignored. The risk of distortion of the control signal SC can be reduced. In addition, the packaging cost and complexity of the power conversion device 100 can be reduced.

[0067] Please refer to Figure 1 as well as Figure 5 , Figure 5 1 is a schematic diagram of the die layout of a power conversion device according to an embodiment of the utility model. The first die DIE1 and the second die DIE2 are packaged in a circuit component. The first die DIE1 includes a control circuit 120 and a cascade switch SWC. The control circuit 120 is integrated in the region RG1 of the first die DIE1. The cascade switch SWC is integrated in the region RG2 of the first die DIE1. The second die DIE2 includes a power switch SWP. That is, the power switch SWP is integrated in the second die DIE2.

[0068] In the present embodiment, the first die DIE1 at least includes pads PD1_1 and PD1_2. The second die DIE2 at least includes pads PD2_1 to PD2_9. The first end of the power switch SWP is coupled to the high voltage end HBUS through at least one of the pads PD2_1 to PD2_4 and at least one of the pins PN1 to PN4 of the circuit component. The second end of the power switch SWP is coupled to the first end of the cascade switch SWC through at least one of the pads PD2_5 to PD2_9 and the pad PD1_1. The second end of the cascade switch SWC is coupled to the electrical connection structure in the first die DIE1 through the pad PD1_2. The control circuit 120 provides the control signal SC to the control end of the cascade switch SWC through the electrical connection structure L1 in the first die DIE1.

[0069] In some embodiments, the control circuit 120 provides the enable signal EN to the control terminal of the cascode switch SWC through the electrical connection structure L1 in the first die DIE1 , and provides the control signal SC to the control terminal of the power switch SWP in the second die DIE2 .

[0070] Please refer to Figure 1 as well as Figure 6 , Figure 6 FIG. 1 is a schematic diagram of a die layout of a power conversion device according to an embodiment of the present invention. Figure 4 The difference from the embodiment of the present invention is that in the first die DIE1, the control circuit 120 can provide the control signal SC to the control end of the cascade switch SWC through the electrical connection structure L1 in the first die DIE1. The control circuit 120 is also connected to the pad PD1_2 through the electrical connection structure L2 in the first die DIE1. Therefore, the control circuit 120 can sense the current value flowing through the cascade switch SWC through the second end of the cascade switch SWC and the pad PD1_2. The control circuit 120 can perform overcurrent protection according to the current value sensed flowing through the cascade switch SWC.

[0071] Please refer to Figure 1 as well as Figure 7 , Figure 7 FIG. 1 is a schematic diagram of a die layout of a power conversion device according to an embodiment of the present invention. Figure 5 The difference from the embodiment of the present invention is that in the first die DIE1, the control circuit 120 can provide the control signal SC to the control end of the cascade switch SWC through the electrical connection structure L1 in the first die DIE1. The control circuit 120 is also connected to the pad PD1_2 through the electrical connection structure L2 in the first die DIE1. Therefore, the control circuit 120 can sense the current value flowing through the cascade switch SWC through the second end of the cascade switch SWC and the pad PD1_2. The control circuit 120 can perform overcurrent protection according to the current value sensed flowing through the cascade switch SWC.

[0072] Please refer to Figure 8 , Figure 8 2 is a schematic diagram of a power conversion device according to an embodiment of the present utility model. In this embodiment, the power conversion device 200 includes a safety capacitor (or X capacitor) CX, a power switch circuit 110, a control circuit 120 and a charge and discharge control circuit 230. The power switch circuit 110 is arranged in the conversion circuit TC. The power switch circuit 110 includes. The power switch circuit 110 includes a power switch SWP and a cascade switch SWC. In this embodiment, the implementation of the power switch SWP and the cascade switch SWC has been Figures 1 to 7 This is clearly described in the embodiments, so it will not be repeated here.

[0073] In this embodiment, the safety capacitor CX is coupled to the first end of the power switch SWP. Specifically, the safety capacitor CX can be coupled to the first end of the power switch SWP via the high voltage terminal HBUS. The charge and discharge control circuit 230 includes a discharge circuit 231 and a charge circuit 232. The discharge circuit 231 is coupled to the second end of the power switch SWP and the control circuit 120. The discharge circuit 231 performs a discharge operation on the voltage value at the safety capacitor CX. The charge circuit 232 is coupled to the second end of the power switch SWP and the control circuit 120. The charge circuit 232 performs a charge operation on the voltage value at the safety capacitor CX.

[0074] The cascade switch SWC, the control circuit 120, the discharge circuit 231, and the charging circuit 232 are integrated or packaged in the first die DIE1. Specifically, the control circuit 120, the discharge circuit 231, and the charging circuit 232 are integrated or packaged in the region RG1 of the first die DIE1. The cascade switch SWC is integrated or packaged in the region RG2 of the first die DIE1. The power switch SWP is integrated or packaged in the second die DIE2. The withstand voltage capability of the second die DIE2 is higher than that of the first die DIE1.

[0075] The control circuit 120 can use the control signal SCD to control the discharge circuit 231. When the power conversion device 100 does not receive the AC power source VIN, the discharge circuit 231 is controlled to discharge the voltage value at the safety capacitor CX. When the discharge circuit 231 discharges the voltage value at the safety capacitor CX, the discharge circuit 231 can use a reference low voltage (e.g., ground) to pull down the voltage value at the safety capacitor CX.

[0076] The control circuit 120 can use the control signal SCC to control the charging circuit 232. When the power conversion device 100 just receives the AC power VAC, the charging circuit 232 is controlled to charge the voltage value at the safety capacitor CX. When the charging circuit 232 charges the voltage value at the safety capacitor CX, the charging circuit 232 can use the electric energy stored in the capacitor CVCC to charge the voltage value at the safety capacitor CX.

[0077] Please refer to Figure 8 as well as Fig. 9 , Fig. 9It is a schematic diagram of the die layout of a power conversion device according to an embodiment of the utility model. In this embodiment, the first die DIE1 includes at least pads PD1_1 to PD1_5. The second die DIE2 includes at least pads PD2_1 to PD2_9. The first end of the power switch SWP is coupled to the high-voltage end HBUS through at least one of the pads PD2_1 to PD2_4 and at least one of the pins PN1 to PN4 of the circuit component. The second end of the power switch SWP is coupled to the first end of the cascade switch SWC through at least one of the pads PD2_5 to PD2_8 and the pad PD1_1. The second end of the cascade switch SWC is coupled to at least one of the pins PN5 to PN8 of the circuit component through the pad PD1_2.

[0078] The control circuit 120 can provide the control signal SC to the control end of the cascade switch SWC through the electrical connection structure L1 in the first die DIE1. The control circuit 120 is also connected to the pad PD1_2 through the electrical connection structure L2 in the first die DIE1. Therefore, the control circuit 120 can sense the current value flowing through the cascade switch SWC through the second end of the cascade switch SWC and the pad PD1_2. The control circuit 120 can perform overcurrent protection according to the current value sensed flowing through the cascade switch SWC.

[0079] The control circuit 120 is coupled to the control terminal of the power switch SWP through the pads PD1_3 and PD2_9. The control circuit 120 provides a bias voltage to turn on the power switch SWP. Such operation can be applied to Figure 2 The power switching circuit 110 is shown.

[0080] In some embodiments, the control circuit 120 can provide the enable signal EN to the control end of the cascade switch SWC through the electrical connection structure L1 in the first die DIE1. The control circuit 120 can provide the control signal SC to the control end of the power switch SWP through the pads PD1_3 and PD2_9. Such operation can be applied to Figure 3 The power switching circuit 110 is shown.

[0081] In this embodiment, the second end of the power switch SWP can be coupled to the discharge circuit 231 and the charging circuit 232 in the charge and discharge control circuit 230 through the pads PD2_8 and PD1_4. The charging circuit 232 is coupled to the capacitor CVCC through the pad PD1_5 and the pin PN9 of the circuit component.

[0082] In summary, the power conversion device includes a power switching circuit and a control circuit. The control circuit and the cascade switch in the power switching circuit are integrated in the first die. The power switch in the power switching circuit is integrated in the second die. The voltage resistance of the second die is higher than the voltage resistance of the first die. The second die is produced by a process rule that meets the high voltage resistance. The first die is produced by a process rule that meets the low voltage resistance. Therefore, the charge and discharge control circuit of the utility model does not need to be integrated in an additional die. The number of die in the power conversion device can be reduced. In this way, under the demand for high voltage, the volume of the power conversion device can be reduced.

[0083] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the appended claims.

Claims

1. A power conversion device, characterized in that: The power conversion device comprises: A power switching circuit, comprising: A power switch, implemented by a depletion-type gallium nitride field effect transistor, wherein a first terminal of the power switch is coupled to a high voltage terminal of the power conversion device; a cascade switch, a first terminal of the cascade switch being coupled to a second terminal of the power switch; and A control circuit coupled to the power switch circuit, wherein the control circuit and the cascade switch are integrated in the first die, wherein the power switch is integrated in the second die, and The pressure resistance of the second crystal grain is higher than that of the first crystal grain.

2. The power conversion device according to claim 1, characterized in that: The cascade switches are implemented by enhancement mode field effect transistors.

3. The power conversion device according to claim 1, characterized in that: The second terminal of the cascade switch is coupled to the control terminal of the power switch, and The control end of the cascade switch is coupled to the control circuit.

4. The power conversion device according to claim 3, characterized in that: The control circuit generates a control signal and provides the control signal to a control terminal of the cascade switch.

5. The power conversion device according to claim 4, characterized in that: The cascade switch performs a switching operation of the power switch circuit in response to a duty cycle of the control signal.

6. The power conversion device according to claim 1, characterized in that: Also includes: A safety capacitor coupled to the first end of the power switch; as well as The charge and discharge control circuit comprises: A discharge circuit is coupled to the second end of the power switch and the control circuit, and is configured to discharge the voltage value of the safety capacitor. The discharge circuit is integrated in the first die.

7. The power conversion device according to claim 6, characterized in that: The charge and discharge control circuit further includes: A charging circuit is coupled to the second end of the power switch and the control circuit, and is configured to charge the voltage value of the safety capacitor. The charging circuit is integrated in the first die.

8. The power conversion device according to claim 1, characterized in that: The control terminal of the power switch is coupled to the control circuit, and The control end of the cascade switch receives an enable signal.

9. The power conversion device according to claim 8, characterized in that: The control circuit generates a control signal and an enable signal, and provides the enable signal to a control terminal of the cascade switch.

10. The power conversion device according to claim 9, characterized in that: The cascade switch is turned on in response to the enable signal, and The power switch performs a switching operation of the power switch circuit in response to the control signal.

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