650W Energy Stage Reference Design For UPS, Inverters

This reference design focuses on a 650-W inverter energy stage appropriate for low-frequency, transformer-based, single-phase Uninterruptible Energy Provides (UPS) that function off a 12-V battery.

An influence inverter is an important system that converts electrical energy from direct present (DC) to alternating present (AC) by refined digital circuits. Its main perform is to rework battery voltage into a normal family AC voltage, enabling the operation of family electronics in environments the place AC energy is in any other case unavailable. 

The design TIDA-01292 by Texas Devices leverages the technological benefits of the TI SMD MOSFET in a SON5x6 package deal, which is notable for its extraordinarily low RDS(on) and minimal gate cost (Qg). This particular alternative facilitates a compact and extremely environment friendly inverter construction by utilising two parallel units for every leg of the full-bridge energy stage. This eliminates the necessity for a warmth sink and reduces the general system value.

This design utilises eight CSD17573Q5B MOSFETs with a low RDS(on) of 0.84mΩ and lowered gate cost, enhancing effectivity by lowering energy conversion and switching losses. Their 8-pin SON 5-mm×6-mm package deal aids in attaining a extra compact design. Moreover, two LM5101B high-voltage gate driver units management these MOSFETs, able to dealing with each high- and low-side N-channel MOSFETs in configurations like synchronous buck or half-bridge. The floating high-side driver helps provide voltages as much as 100 V and supplies 2 A of gate drive capability, with independently controllable outputs through CMOS enter thresholds.

The INA181 handles the system’s present sensing and overcurrent safety. It’s a bidirectional present sense amplifier that detects voltage drops throughout sense resistors at common-mode voltages from -0.2 to 26V, whatever the provide voltage. It makes use of the A2 variant with a hard and fast acquire of fifty, integrating a matched resistor acquire community to minimise acquire error and temperature drift. The INA185 amplifier is offered for functions requiring superior efficiency.

This inverter design is tailor-made for standby or offline UPS programs from 100 VA to 850 VA, expandable to 1.5 kVA with further parallel FETs. Using SMD MOSFETs improves manufacturability and simplifies meeting whereas eliminating warmth sinks, which reduces prices and manufacturing time. Validated for 100-W to 650-W masses, the design usually achieves 95% effectivity, with peaks over 98.5%. It incorporates a number of protections, together with overcurrent, brief circuit, overvoltage, and undervoltage, making it versatile for functions like UPS, DC-to-AC inverters, vitality storage, and residential inverters.

TI has examined this reference design with a Invoice of Materials (BOM), schematics, and different knowledge. The corporate’s web site has further knowledge concerning the reference design. To learn extra about this reference design, click on right here.