portable energy storage power supply (outdoor power supply) refers to a small energy storage device with a weight of no more than 18kg, consisting of high-density lithium batteries or battery packs, corresponding circuits and casings, which can be used in conjunction with solar panels , equipped with a 220V AC output port and multiple interfaces such as Type-C (low voltage) and USB (low voltage), and can provide stable DC or AC output, with a total rated energy of more than 160 Wh for the battery or battery pack.
In practical applications, since portable energy storage power supplies contain both high-voltage and low-voltage circuits, engineers typically integrate isolation devices such as digital isolators into the system to build a reliable electrical isolation system in order to ensure personal and equipment safety, reduce electromagnetic interference, improve signal transmission stability, and meet relevant safety certification requirements.
As shown in the diagram below, a portable energy storage power system typically consists of multiple functional modules, including energy conversion, energy storage, energy management, logic control, safety protection, and external communication.
In this system , the digital isolator is mainly responsible for building a reliable electrical isolation communication channel between various functional modules, thereby blocking adverse interferences such as electrical noise, surges, and ground potential differences, so that the control unit, power conversion unit and battery management system can still have stable and accurate data transmission capabilities under complex environmental conditions.
A schematic diagram of a common electrical isolation scheme for a portable energy storage power system.
This isolation method can not only significantly suppress common-mode interference caused by high-speed switching and transient surges of power devices, and enhance the data integrity and anti-interference capability of the communication link, but also prevent high-voltage side energy from back-entering the low-voltage control side through the signal channel in the event of abnormal or faulty conditions , thereby improving the safety performance of portable energy storage power systems .
It can be said that for portable energy storage power supplies, which are electrical systems with a high degree of coexistence of strong and weak currents and variable working environments, digital isolators are not only key components to ensure the coordinated operation of their multi-functional modules , but also fundamental technical support for avoiding ground loop problems and improving the overall reliability and safety level of the device.
As the requirements for safety regulations and system reliability of portable energy storage power supplies continue to increase, electrical isolation design has become a critical aspect of the overall system architecture.
Especially under conditions involving both strong and weak currents, high-frequency switching, and complex operating environments, the withstand voltage, anti-interference performance, and long-term stability of isolation devices directly impact system safety and operational reliability.
Therefore, selecting mature and well-balanced digital isolators has become an important consideration in engineering design.
For example, HOPERF's CMT series digital isolators, independently developed based on mature RF chip design experience and advanced manufacturing processes, are electrical safety "cores" that adopt capacitive coupling technology and have advantages such as high isolation withstand voltage, high common-mode transient immunity (CMTI), high transmission rate, low transmission delay, low power consumption, and long-term reliability.
The CMT812X, CMT804X, and CMT826X are a series of standard digital isolators with different numbers of channels and signal direction configurations.
They can effectively block the effects of surges, electromagnetic interference, and common-mode noise in high-voltage systems on low-voltage logic circuits, and ensure that digital signals can be transmitted accurately, efficiently, and safely to the receiving end.
They are especially suitable for portable energy storage power systems with high requirements for safety, anti-interference capability, and system stability.
The CMT8602X is a series of isolated driver chips with 3.75/5.75kVrms isolation withstand voltage, CMTI ≥ ±150kV/μs, and 4A peak source current and 6A peak sink current.
They can drive power devices with switching frequencies up to 5MHz, exhibiting best-in-class propagation delay and pulse width distortion, effectively reducing switching losses and improving system efficiency.
Simultaneously, they effectively block the coupling of common-mode noise and transient crosstalk from the high-voltage side to the control side, preventing false triggering and control anomalies, and significantly improving the safety and reliability of the power stage and control stage working together.
The CMT10XX and CMT8308X are a series of isolated interface chips that integrate CAN and RS-485 interfaces.
They achieve a high degree of integration of digital isolation and physical layer interface functions within a single chip, enabling the direct construction of isolated communication links.
This effectively suppresses the impact of common-mode interference and ground potential difference on bus signals, and prevents abnormal voltage on the high-voltage side from being conducted to control and peripheral ports through the communication lines.
In complex electromagnetic environments, these isolation interface chips can still ensure the integrity and timing consistency of differential signals, and ensure the stability of data transmission.
They are particularly suitable for portable energy storage power systems with high requirements for communication robustness and system security.
https://www.hoperf.com/service/apply/
If you are interested in HOPERF's independently developed series of digital isolators (basic isolation, isolation interfaces, isolation drivers, isolation ADCs/op-amps), please scan the QR code above or copy and open the link at the end of the article to apply for samples. We will be happy to serve you!
