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The PBM27A-210-MV--R refers to a transformer model commonly found in DeWALT battery chargers, specifically within the DCB107 and DCB115 units. Diagrams for these boards are often sought for "re-winding" or modifying chargers (such as converting 110V units to 220V). PBM27A-210-MV--R Context & Diagrams The transformer is a central component of the power supply stage in these chargers. While a single official datasheet for just the transformer is rare, you can find the complete board schematics where this component is integrated: DeWALT DCB107 Schematic: Discussions on enthusiast forums like 78294.ru provide detailed circuit board images and partial schematics identifying the PBM27A-210. DeWALT DCB115 Modification: For users looking to adapt the charger for different voltages, visual guides on 78294.ru show the transformer's placement relative to the input capacitors and switching transistors. Pinterest Technical Pins: A specific electrical diagram link for the "PBM27A 210 MV R" is maintained on Pinterest , often linking to Orion PW 415 or similar power supply repair guides. Key Findings for Repair/Modification Common Use: Primarily used in DeWALT 12V-20V MAX Lithium-Ion chargers. Related Components: When troubleshooting this transformer, check the nearby PWM controller IC and the high-voltage electrolytic capacitors , as these are frequent failure points alongside the transformer in these charger models. Resources: If you need a full service manual, you can search repositories like eServiceInfo where this specific string is a popular search for datasheet hunters. Pbm27a 210 mv r электрическая схема
1. Introduction: What is the PBM27A-210-MV-R Diagram? The code PBM27A-210-MV-R (in earlier revisions, it appears as PBM27A-210(MU)-R ) refers to the main printed circuit board (PCB) used in the DEWALT DCB107 and DCB115 multi-voltage lithium‑ion battery chargers. These chargers are designed to work with slide‑pack batteries ranging from 10.8 V to 18 V (20 V Max), offering a convenient single‑charger solution for a variety of DEWALT cordless tools.
Part Number: PBM27A-210(MU)-R with the manufacturer code 29511600069-RA5 . Primary Application: DEWALT DCB107 (1.25 A output) and DCB115 chargers. Role: The board contains the entire power conversion, control logic, and safety monitoring circuitry required to safely charge DEWALT Li‑Ion battery packs.
A full “wiring diagram” or “schematic” for this board has not been officially released by DEWALT. However, through the combined reverse‑engineering work of hobbyists and technicians on various repair forums, a nearly complete picture of its pin‑outs, component values, and signal flow has been reconstructed. This article consolidates that information, turning the PBM27A-210-MV-R reference into a practical guide for anyone who needs to diagnose or repair this charger. pbm27a-210-mv--r diagram
2. Functional Overview & Block Diagram The DCB107/DCB115 charger operates as a standard off‑line flyback switching power supply with a smart charging controller. The PBM27A board can be divided into three main functional sections:
AC‑Input and Primary (High‑Voltage) Side
Accepts universal AC input (100‑240 V~, 50/60 Hz). Rectifies and filters the AC line to a high‑voltage DC bus. A primary‑side switching controller (PWM controller IC) drives a power MOSFET, which switches the primary winding of the isolation transformer. The PBM27A-210-MV--R refers to a transformer model commonly
Isolation Boundary (Transformer & Optocouplers)
The flyback transformer provides galvanic isolation between the AC mains and the battery output. Optocouplers (e.g., PC817 types) send feedback signals from the secondary side back to the primary controller.
Secondary (Low‑Voltage) Side & Battery Management While a single official datasheet for just the
The secondary side produces a regulated DC output (approx. 22 V unloaded, which is then trimmed to suit the battery’s voltage). A dedicated Li‑Ion charge management IC (often an IW1710‑01 or similar) monitors battery voltage, current, and temperature. The controller communicates with the battery pack via the charger’s 8‑pin connector to request a charging voltage and to verify that the pack is genuine and safe. Output switching MOSFETs (usually P‑channel MOSFETs) connect the charger output to the battery.
Below is a conceptual block diagram that illustrates the high‑level signal flow of the PBM27A board. [AC Input] --> [Bridge Rectifier & Bulk Capacitor] --> [Flyback Transformer Primary] --> [Primary MOSFET (Q1: P10NK60ZFP)] | [PWM Controller IC (IW1710‑01)] <-- [Optocoupler Feedback] <--+ | v [Flyback Transformer Secondary] | v [AC Return] [Rectification & Smoothing] | v [Secondary Controller] --> [Output MOSFETs] --> [Battery Connector] | v [Charge Status LEDs]