Preface
Totem pole is an output drive circuit structure commonly found in digital circuits that converts logic signals into drive signals for external devices. It is commonly used to drive diodes, MOS transistors, etc., to realize the connection of digital circuits with external circuits. A totem pole typically consists of two power tubes, which are connected in a common collector configuration. In common totem poles, two power tubes form a push-pull output structure, and by controlling the switching state of the two transistors, the totem pole can provide both high-level and low-level signals at the output. At the same time, because this structure is somewhat similar to the totem pole of the Indians, it is called totem pole output.
When sorting out the previous dismantling cases, it was found that the following three high-power power supply devices have built-in totem pole circuits, which can effectively reduce losses and improve product energy efficiency.
Platinum 2000W BIDIRECTIONAL AC-DC GaN inverter
This 2000W bidirectional inverter is designed with an industry-standard enclosure and is equipped with screw terminals for both AC and DC input/output. The bidirectional inverter has its own cooling fan to dissipate heat from the internal power devices and reduce the temperature rise. The bidirectional inverter is designed to be used with a 48V battery pack, and supports the parallel use of multiple units on the AC side to increase the output power.
Related Reading:
Teardown Report: Platinum 2000W Bidirectional AC-DC GaN Inverter
Built-in totem pole PFC control chip
恩智浦MC56F82736V
NXP's MC56F82736V is a DSP digital signal controller that is used in this inverter for totem-pole PFC control and output modulation. The chip includes 64KB of flash and 8KB of RAM, high-resolution PWM output, 12-bit DAC, and high-speed ADC for high-efficiency digital power conversion and advanced motor control applications.
Built-in totem pole PFC power tube
Gallium Future G1N65R035TB-N
GaNext Future G1N65R035TB-N is an industry-leading GaN switch with a voltage of 650V and a peak voltage of 800V, with a conduction resistance of only 35mΩ and a TO247 package. It also features a rugged gate that simplifies gate drive design, providing optimal performance and outstanding reliability.
The G1N65R035TB-N gate supports ± 20V withstand voltage without negative voltage shutdown, and is compatible with traditional controllers. It has fast switching to reduce switching losses, low gate charge to reduce drive losses at high frequency switching, and reverse freewheeling to reduce dead time losses due to very low VF. The low reverse recovery charge is suitable for hard-switching bridge applications, and the high peak tolerance of 800V enhances the reliability of the device.
The use of G1N65R035TB-N improves conversion efficiency, high-frequency switching helps reduce the size of the power supply, reduces the heat dissipation requirements of the product, reduces size and weight, and improves safety and reliability with lower operating temperatures. The G1N65R035TB-N is suitable for hard-switching bridge circuits, such as continuous current-mode totem-pole bridgeless PFCs or inverters, (bidirectional) HVDC buck or boost circuits with synchronous rectification, as well as high-frequency, high-efficiency phase-shifting full-bridge, LLC or other soft-switching topologies with a power range of 2KW-6KW.
Electric Xiaoer 1000W outdoor power supply 1000Pro
The 1000Pro has a built-in 1002Wh battery, a built-in bidirectional inverter that supports 1000W output power, and supports 2000W peak output power. And with AC direct input charging and solar charging, it can fully charge the outdoor power station in 1.8 hours. The 1000Pro outdoor power station also has USB-C and USB-A fast charging, USB-C supports 100W fast charging output, USB-A supports 18W fast charging output, and DC car charging interface supports 12V10A output to meet the outdoor power needs of a variety of devices.
Related Reading:
Dismantling report: electric small two 1000W outdoor power supply 1000Pro
Built-in totem pole PFC driver chip
恩智浦MC56F82736V
The power station also has a built-in NXP MC56F82736V for totem pole PFC control and output modulation. The description has been mentioned above and will not be repeated here.
Built-in totem pole PFC power tube
Gallium Future G1N65R050TB-N
Gallium Future G1N65R050TB-N is an GaN switch with a withstand voltage of 650V and a peak withstand voltage of 800V, with a conduction resistance of only 50mΩ and a TO247 package, which is at the leading level in the industry. It also features a rugged gate that simplifies gate drive design, providing optimal performance and outstanding reliability. It is used here as a fast half-bridge for the totem pole PFC.
The GaFuture G1N65R050TB-N gate supports ± 20V withstand voltage without negative voltage shutdown and is compatible with traditional controllers. The high switching speed reduces switching losses, and the low gate charge reduces drive losses at high frequency switching. The reverse freewheeling has a very low VF, reducing the loss of dead time. The low reverse recovery charge is suitable for hard-switching bridge applications, and the high peak tolerance of 800V enhances the reliability of the device.
移族2000W 2009Wh户外电源 墨M2000
The mobile M2000 outdoor power station adopts a one-piece aluminum alloy shell, and there are handles on both sides of the housing. There is a display panel on the front of the outdoor power station, and there is a USB fast charging output and an inverter AC output. On the back of the outdoor power supply, there is an AC input interface and a parallel interface, and a large-area fill light. The outdoor power station has a built-in 2000Wh quasi-solid-state lithium battery, a bidirectional inverter that supports 1200W charging input and 2000W inverter output, and a USB-C interface that supports 100W fast charging.
Built-in totem pole PFC driver chip
恩智浦MC56F82748VLH
The totem-pole PFC controller from NXP, model MC56F82748VLH, is a DSP digital signal controller with built-in 64KB FLASH and 8KB SRAM, high-resolution PWM output, built-in 12-bit DAC and high-speed ADC.
Built-in totem pole PFC power tube
Gallium Future G1N65R035TB-N
The two gallium nitride switches used for the totem-pole PFC fast half-bridge are also gallium future G1N65R035TB-N, and the relevant parameters have been described in detail above, so I will not repeat them here.
Summary of the charging head network
The charging head network understands that the application of totem pole circuit in high-power power supply equipment can effectively improve energy efficiency. The three cases mentioned in this paper achieve high-efficiency power factor correction and output modulation through the built-in totem-pole PFC control chip and gallium nitride power tube, which greatly reduces energy loss, greatly reduces switching loss, and has excellent reverse freewheeling effect, which further improves the conversion efficiency. The totem pole output not only makes the circuit connection more stable and reliable, but also provides a feasible solution for enterprises that currently pursue energy conservation and environmental protection, and lays a solid foundation for high-power power supply equipment to make more intelligent and efficient energy utilization.