Otis Singleton
In electrical engineering, a module is a distinct assembly of components that can be easily added, removed, or replaced in a larger system. Power modules, for example, are high-power electrical components that contain a single or several components combined into a functional, isolated unit. They are commonly used in electric cars, motor controllers, appliances, power supplies, and medical equipment. Power modules come in different shapes and sizes and can be categorized by the power processing topology used or the power semiconductor devices used.
Characteristics and Values of Electrical Modules
| Characteristics | Values |
|---|---|
| Definition | A module is a distinct assembly of components that can be easily added, removed, or replaced in a larger system. |
| Function | Power modules are high-power electrical components that contain a single or several components combined into a functional, isolated unit. |
| Composition | Power modules contain multiple semiconductor dies that are connected to form an electrical circuit of a certain structure, called topology. |
| Applications | Power modules are commonly used in electric cars, motor controllers, appliances, power supplies, electroplating machinery, medical equipment, battery chargers, AC to DC inverters, converters, power switches, and welding equipment. |
| Advantages | Power modules offer improved power handling, reliability, and decreased parasitic circuit elements. They also allow for easy repair, upgrade, and extension of functionality. |
| Electrical Connections | Electrical connections between the module and other parts of the power electronic system can be achieved through screw contacts, pin contacts, press-fit contacts, spring contacts, or pure pressure contact. |
| Voltage Selection | Modules allow for voltage selection by changing connections on the transformer, ensuring equipment operates at the desired voltage. |
| Fuses | Some modules can accept multiple fuse sizes, while others are designed for specific fuse sizes. |
| Filtering | Modules with filters, such as RFI/EMI filters, help remove electromagnetic and radio frequency interference, ensuring clean electricity and preventing equipment malfunctions. |
| Form Factors | Power modules come in different shapes and sizes and can be categorized by power processing topology or power semiconductor devices used. |
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What You'll Learn
- Power modules are electrical components that contain a single or multiple components combined into a functional unit
- Electrical connections between module terminals and semiconductor chips are made by wire bonding
- Power semiconductors are soldered or sintered on a substrate that carries them, provides electrical contact, and insulates them
- Parasitic elements in power modules can negatively affect electromagnetic radiation and switching behaviour
- Power modules are used in electric cars, motor controllers, appliances, power supplies, and medical equipment
Power modules are electrical components that contain a single or multiple components combined into a functional unit
Power modules are available in various topologies, including boost or power factor correction, ANPFC (power factor correction leg with switches and antiparallel diodes), and three-level NPC (multilevel inverter leg with switches and antiparallel diodes). The electrical connections between the top connections of semiconductor chips and module terminals are typically made through wire bonding using materials such as aluminium, copper, or gold.
Power modules can be categorised by the power processing topology used or the power semiconductor devices employed. For example, diode rectifiers or thyristor rectifiers are configured with four or more diodes or thyristors in a bridge circuit, converting an AC input into a DC output. More complex power modules may include up to six transistors for inverting applications, converting direct current electricity into alternating current.
Intelligent power modules are a recent development, typically containing an IGBT with added control and protection circuitry. The control circuitry enables simple turn-on and turn-off functions, while the protection circuitry safeguards against issues arising from high temperatures, excessive current, short circuits, and undervoltage conditions.
Power modules provide several advantages over isolated components, including ease of repair, upgradeability, and extended functionality. They offer a robust solution for high-power switching applications and are designed for quick and easy mounting and removal.
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Electrical connections between module terminals and semiconductor chips are made by wire bonding
In the context of electrical engineering, a module is a high-power electrical component that contains a single or several components combined into a functional, isolated unit. Power modules are used in a variety of applications, including electric cars, motor controllers, appliances, power supplies, and medical equipment. They are commonly used for high-power switching applications and offer advantages such as improved power handling, reliability, and reduced parasitic circuit elements.
Electrical connections between module terminals and semiconductor chips are made through a process called wire bonding. Wire bonding is a standard technique used to connect microchips to the terminals of a chip package or directly to a substrate. It involves interconnecting the internal parts of the chips to the outside, typically using gold, copper, or aluminium wires. Wire bonding is widely used in the semiconductor industry as it is a cost-effective and flexible method of making interconnections.
The wire bonding process can be categorised into two types: ball-wedge and wedge-wedge. In the ball-wedge method, a small ball is formed at the end of the bond wire using an electrical spark, and then pressed onto the bond pad under heat, ultrasound energy, or both. This creates the first bond. The capillary is then moved to the target pad, where the wire is bonded using the same forces, forming a 'wedge'.
Different types of wire bonding include thermosonic bonding, ultrasonic bonding, and thermo-compression bonding. Thermosonic bonding uses a combination of heat and ultrasonic energy to maximise the reliability and strength of the wire bond. Ultrasonic bonding uses ultrasonic energy and downward pressure to create the weld, while thermo-compression bonding uses heat and pressure.
Wire bonding is an essential process in the manufacturing of electronic devices, ensuring the functionality and durability of the components. It is commonly used in appliances such as mobile phones, laptops, and other high-end technological equipment, connecting integrated circuits to electrical appliances and printed circuit boards (PCBs).
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Power semiconductors are soldered or sintered on a substrate that carries them, provides electrical contact, and insulates them
Power modules are high-power electrical components that contain a single or several components combined into a functional, isolated unit. Power semiconductors, also known as dies, are integral to power modules. These power semiconductors are typically soldered or sintered onto a substrate. The substrate carries the semiconductors, provides electrical and thermal contact, and insulates them.
The substrate is a crucial component in power electronics, providing the interconnections necessary to form an electric circuit, similar to a printed circuit board (PCB). It also serves to cool the components. Compared to lower-power microelectronics, substrates in power modules must carry higher currents and provide higher voltage isolation, up to several thousand volts. Additionally, they need to operate within a broad temperature range, from -50°C to 200°C.
Different types of substrates are used in power modules, including DBC (direct bonded copper), IMS (insulated metal substrate), and AMB (active metal brazing). DBC substrates are commonly used due to their excellent thermal conductivity. They are composed of a ceramic tile with a sheet of copper bonded to one or both sides through a high-temperature oxidation process. The copper-oxide eutectic formed during this process successfully bonds with both the copper and the ceramic substrate.
IMS substrates offer enhanced heat dissipation compared to classical PCBs. They consist of a metal baseplate, typically made of aluminium for its low cost and density, covered by a thin layer of dielectric and a layer of copper. The baseplate is attached to a heatsink to provide cooling. AMB involves soldering a metal foil to a ceramic baseplate using high temperatures under vacuum, resulting in electrical properties similar to DBC but is more suitable for small production lots.
The electrical connections between the semiconductor chips and the module terminals are typically achieved through wire bonding using materials such as aluminium, copper, or gold. Soldering is also used to attach the substrate to a heat spreader, enhancing thermal management. Overall, the substrate plays a vital role in the functionality and performance of power modules by facilitating electrical connections, providing insulation, and ensuring effective thermal management.
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Parasitic elements in power modules can negatively affect electromagnetic radiation and switching behaviour
Power modules are high-power electrical components that contain a single or multiple components combined into a functional, isolated unit. They are commonly used in applications requiring high-power switching, such as electric cars, motor controllers, appliances, power supplies, and more.
Parasitic elements, such as unwanted capacitances and inductances, can be detrimental to the performance of power modules. These parasitics can negatively impact the electromagnetic radiation (EMR) of the module, particularly when operated as an inverter. This can lead to issues such as electromagnetic interference (EMI), which reduces power quality, increases noise levels, causes interference with other devices, and decreases efficiency. Additionally, parasitic elements can adversely affect the switching behaviour of power modules, leading to increased switching losses and potentially impacting the overall reliability of the system.
To mitigate these issues, manufacturers strive to minimise parasitic elements in their module designs while maintaining cost-effectiveness and interchangeability with other manufacturers' modules. This involves optimising the thermal path between the heat source (the dies) and the heat sink to efficiently dissipate heat. Additionally, design strategies such as balanced circuits, signal filtering, and low inductance components are employed to reduce the effects of common mode currents and improve overall performance.
Intelligent power modules are a recent development in power module technology. These modules incorporate added control and protection circuitry, enhancing the functionality and robustness of the module. The control circuitry enables simple turn-on and turn-off mechanisms, while the protection circuitry safeguards against issues arising from high temperatures, excessive current, short circuits, and undervoltage conditions.
Overall, parasitic elements in power modules can have detrimental effects on both electromagnetic radiation and switching behaviour. By understanding and minimising these parasitic elements, manufacturers can improve the performance, efficiency, and reliability of power modules in various high-power applications.
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Power modules are used in electric cars, motor controllers, appliances, power supplies, and medical equipment
A power module, also known as a power electronic module, is a high-power electrical component that contains a single or several components combined into a functional, isolated unit. Power modules are used in a wide range of applications, including electric cars, motor controllers, appliances, power supplies, and medical equipment.
In the context of electric cars and motor controllers, power modules are essential for regulating the motor's torque and speed, facilitating lower energy consumption. DC motor controllers, for example, are commonly used in electric vehicles to control speed and torque, offering high performance at a lower cost. AC motor control modules are also used to maintain the speed of appliances like fans, blowers, and pumps, helping to reduce the impact of components that could throttle speed.
Power modules are crucial in appliances, ensuring the efficient functioning of devices. For instance, AC and DC motors may not require controllers but may include motor starters or similar components. Stepper motors, a type of motor controller, send currents in various phases, pulses, or steps to the stepper motor, making them useful in construction, robotics, and manufacturing environments.
In the medical field, power supplies for medical equipment must meet specific safety standards and considerations. Leakage current, for instance, is a critical parameter influencing power supply choice in medical equipment. End users of medical-approved Murata Power Solutions (MPS) power supplies can be confident that the Means of Operator Protection (MOP) has been evaluated by a third-party accredited safety agency.
Power modules are also integral to power supplies in general. They provide physical containment for power components, usually power semiconductor devices, and offer improved power handling, reliability, and decreased parasitic circuit elements. Power modules come in various types, such as diode rectifiers or thyristor rectifiers, and can be categorized by power processing topology or power semiconductor devices.
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Frequently asked questions
A module is a device that combines multiple power entry functions into a single unit. It is a distinct assembly of components that can be easily added, removed, or replaced in a larger system.
Examples of electrical modules include power modules, diode power modules, intelligent power modules, and Interpower filtered power entry modules.
Power modules are used in electric cars, electric motor controllers, appliances, power supplies, electroplating machinery, medical equipment, battery chargers, AC to DC inverters and converters, power switches, and welding equipment.
Power modules offer improved power handling, reliability, and decreased parasitic circuit elements. They also allow for easy mounting and removal due to their electrical contacts and base plate for mounting a heat sink.
When selecting a module, it is important to consider the fuse size specifications and the presence of a filter. Modules with filters help remove electromagnetic and radio frequency interference (noise) from the equipment, preventing malfunctions and interference with other equipment.
