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Datasheets, engineering design documents and technical documentation for GREEN power systems.
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27 docs24,062 words · scheme design, calculation methods & guidesFlyback AC-DC Power Supply Design
Complete schemes for four 5~90W power sub-ranges: JW1520AC / KP22306 / U8722 GaN / MK2697+GaN, with BOM and loss calculations
AHB Flyback AC-DC Power Circuit Design
91~180W asymmetric half-bridge flyback: DK8318+DK8515 integrated GaN architecture, ZVS soft switching, 94% efficiency
AHB Flyback AC-DC Power Circuit Design
100~240W upgraded version: 240W parameter calibration + HUSB368 supporting PD3.1 EPR 48V/240W
150~600W AC-DC Power Supply Design
TEA2017 integrated PFC+LLC (GaN-drivable) + MP6924A synchronous rectification; 200/400/600W tiered BOM and thermal assessment
600~2000W AC-DC Power Supply Design
NCP1654 CCM PFC + L6599 half-bridge LLC + MCU voltage/current regulation; 800W/1.2kW/1.8kW tiered selection
2000~3000W AC-DC Full-Bridge LLC Circuit Design
Totem-pole bridgeless PFC (HT1010) + full-bridge LLC (L6599); itemized loss breakdown of the 56V/50A example
Forward AC-DC Power Supply Design
150~500W with 0~100V continuously adjustable output: L6562A + NCP1252AD two-switch forward + SP6019S8RGB synchronous rectification
Isolated DC-DC Circuit Design
Selection matrix of five isolated schemes from 5W flyback chips to 500W push-pull and 1000W quasi-resonant full-bridge
Buck-Boost Circuit Design
Three buck-boost schemes: SEPIC for low power, four-switch PL5501 (95% efficiency), 150V wide-voltage EG1151
Boost (Step-Up) Circuit Design
Four-tier chip schemes and inductor calculations from single-cell 1V boost to general-purpose high-power BOOST
DC-AC Inverter Power Supply Design
EG8015 SPWM sine inverter scheme: front-end boost topology selection + complete 2kW inverter-stage parameters
DC-Input PD Power Supply Design
Injoinic IP6558 / IP6538 / IP6537 three highly integrated schemes, 45W~140W full-protocol fast charging
PD Power Secondary-Side Circuit Design
Hynet HUSB series PD protocol chips fully explained: single-port 65W~240W EPR, dual-port and triple-port schemes
Auxiliary Power Supply Design
CR5269 flyback auxiliary supply: primary 20V + secondary 12V / isolated 12V three outputs for PFC/LLC/MCU
Battery Charging Voltage & Current Settings
Quick formulas for four battery types' charging voltage/current + basic/smart/premium three tiers of charging control circuits
Battery Charging Knowledge
Lithium four-stage, lead-acid three-stage + temperature compensation, and NiMH -dV full-charge detection: charging curves and criteria explained
LLC Circuit Calculation Guide
Full derivation of the LLC parameter formula chain + 200W~2800W quick-reference tables for transformers / resonant inductors / losses by power range
PFC Inductance & Efficiency Calculation
PFC inductance / AP / turns / loss formula chain + 200W~2000W quick-reference tables for inductor and switch selection
Flyback Transformer Parameter Calculation
Complete calculation chain from AP core selection to Lp / Np / turns ratio / winding currents / losses, with a fully worked 30W example
Push-Pull & Full-Bridge Transformer and Output Inductor Calculation
Push-pull symmetry design points, full-bridge sandwich winding, output filter inductor calculation and a 600W full-bridge example
Forward Transformer and Inductor Calculation
Forward transformer AP / turns ratio / wire diameter / losses and Sendust energy-storage inductor selection, fully worked 5V/40A example
AHB Power Transformer Calculation
Complete 140W AHB transformer worked example: turns ratio / inductance / core / leakage & resonant capacitance / wire diameter / losses
Power Supply Thermal Design
Thermal resistance model, natural convection / forced air / heatsink calculations, duct three red lines & four rules, fan selection and PCB-level thermal design
Inside a Battery Charger: The Essential Components Explained
What every battery charger has inside — input filter, bridge rectifier, PFC, transformer, switch stage, feedback loop, charge control IC, protections — and how each part affects reliability.
Do Lithium Batteries Need a Special Charger? Li-ion and LiFePO4 Explained
Why lithium-ion and LiFePO4 packs require dedicated chargers with CC-CV control and per-chemistry voltage limits — and what happens if you use the wrong charger.
Battery Charger Circuits Explained: Topologies, Components and Safety
Linear vs switching charger circuits, key components (transformer, rectifier, regulator, control IC), common topologies and the protections that make charging safe.
Types of Power Adapters: A Buyer's and Engineer's Guide
Wall plug, desktop brick, GaN USB-C PD, open-frame and battery charging adapters — how the common AC/DC power adapter types differ, and how to pick the right one.