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Limited Power Sources (LPS): IEC62368-1 vs. UL1310 For AC DC Power supplies and Adapters

Limited Power Sources (LPS): IEC62368-1 vs. UL1310 For AC DC Power supplies and Adapters

2/20/2020

Introduction

IEC62368-1 and UL1310 are product safety standards which aim to keep humans safe by lowering the possibility of a hazardous situation. Both standards agree that limiting the output power of power supplies connected to mains results in a reduced risk of starting a fire, especially during an overload condition. While the two share similar ideas, the requirements and definitions differ slightly.

Overview

IEC62368-1 gives the name “Limited Power Source” (LPS) to a class of AC to DC and DC to DC power supplies which meet a set of criteria defined in Annex Q of the standard. It is important to note that a power supply certified to IEC62368-1 does not imply that it also LPS compliant; LPS compliance is optional. GlobTek aims to include LPS ratings and LPS certification in as many product families as possible.

(Note: The definition of LPS in IEC62368-1 is identical to the definition in IEC60950-1, as of February 2020.)

UL1310 requires that all AC/DC power supplies and AC/DC adapters carrying UL1310 certification have limited output power capability. Thus, there is no need for a term like LPS, since all UL1310 power supplies must be limited. The limits are defined in Section 28 of the standard. UL 1310 AC adapters and power supplies are also known as Class 2 Transformers.

The following discussion applies to “inherently limited” power sources, that is, power sources which cannot exceed certain power limits by virtue of their design. Switch-mode power supplies and AC Adapters which are IEC62368-1/LPS or UL1310/Class 2 compliant, are typically “inherently limited” by an electronic regulation network or due to the intrinsic power limitation of certain components.

Definitions

IEC62368-1:
An inherently limited power source (LPS) is an isolated circuit which…
  1. …cannot provide more than 100VA of continuous apparent power under any loading condition
  2. …cannot supply substantial current under a short circuit condition
  3. …has a SELV compliant open circuit voltage of 60V DC or 42.4V peak AC max
UL1310:
An inherently limited unit is an isolated circuit which…
  1. …cannot provide more than 100VA of continuous apparent power under any loading condition
  2. …cannot supply substantial current under a short circuit condition
  3. …has a SELV compliant open circuit voltage of 60V DC or 42.4V peak AC max
  4. …has a limited nameplate current rating

As evident in the above list, the major difference between the two definitions is UL1310’s explicit inclusion of a maximum nameplate current rating. While IEC62368-1 does not discuss nameplate ratings directly, it still implies maximum nameplate ratings, as long as the power supply is constant voltage (CV) in nature. That is, its open-circuit output voltage is essentially the same as its full-load output voltage.

Discussion

The graph below shows the restrictions on current according to the two standards. Notice that the UL1310 nameplate rating (yellow) is limited to 5A when the open-circuit output voltage is ≤20V. On the other hand, an IEC62368-1 power supply (red) may be rated up to 8A for open-circuit output voltages ≤12.5V. To reiterate, there are no explicit nameplate restrictions per IEC62368-1, but it is essential to keep the output current below the red curve in order to comply with IEC62368-1/LPS, for a CV power supply.

graph

The blue curve may be a source of confusion to some. To understand its place, it is important to remember that the x-axis is the open-circuit output voltage and that both standards require that apparent power never exceeds 100VA under any circumstance. Basically, the blue curve only applies to power supplies which reduce their output voltages under heavy loading.

For example, a 20V nameplate power supply is only allowed to provide 8A of output current if its loaded output voltage drops sufficiently to ensure that 8A * Vout-loaded ≤ 100VA. In this case, Vout-loaded must collapse to ≤12.5V to comply.

However, since most applications prefer fully constant voltage operation, this type of power limiting is generally undesirable. For applications which require power sources near the 100VA limit, GlobTek’s GTM96900P 90W LPS power supplies are designed to operate entirely in constant voltage mode, and employ an electronic over-current limiter to prevent the unit from supplying greater than 100VA, if overloaded. GlobTek offers LPS power supplies in wall plug-in, desktop, and open-frame configurations from 3-100W.

NameDescriptionOutput WattsInput VoltageVoutEfficiency LevelDimensions (mm)

GTM96300-36VV-R2
GTM96300-36VV-R2, ITE / Medical Power Supply/Class 2/Household Power Supply, 60601-1-4th Ed. , Wall Plug-in+Desktop Combination, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, IEC 60320/C8 AC Inlet connector, Output Rating: 36 Watts, Power rating with convection cooling (W) , 5-54V in 0.1V increments, Approvals: CCC; Korea (12-14.9V Only); ETL; LPS 60950; CAN ICES-3; CB 62368; CB 60950; ETL 1310; ETL; 230V CoC Tier 2; EAC; cETLus 60950-1; UL 1310; cETLus 60601-1-11; ETL 62368; FCC; S-Mark 60950; Double Insulation; LPS 62368; CE; CE; CB 60335; S-Mark IEC/EN 60601-1; CE; China RoHS; Level VI; RoHS; Ukraine; VCCI; WEEE; PSE; PSE; PSE; CB 60601-1;36100-240V~, 50-60 Hz5-54 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782(L)101.73x(W)46.47x(H)38.2mm

GTM46161-16V.V-USBC
GTM46161-16V.V-USBC, Medical Power Supply, 60601-1-4th Ed. , Wall Plug-in, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, Blade Options for Q Series Wall Plug-in Power Supplies, Output Rating: 16 Watts, Power rating with convection cooling (W) , 5-5.5V in 0.1V increments, Approvals: PSE; CB 60950; CB 62368; CE; China RoHS; Double Insulation; EAC; LPS 62368; Morocco; LVD 60335; CB 60601-1; ETL;16100-240V~, 50-60 Hz5-5.2 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178241.0 x 70.0 x 35.1

GTM86100-10VV-W2A-USB
GTM86100-10VV-W2A-USB, ITE / Medical Power Supply, Wall Plug-in, AC/DC Switching Adapter with USB Power Supply AC Adaptor, , Input Rating: 100-240V ̴ , 50/60Hz, Australian AS 3112 configuration: SAA 2 pins Class II, Output Rating: 10 Watts, Power rating with convection cooling (W) , 5-5.2V in 0.1V increments, Approvals: CB 60335; CE; China RoHS; Double Insulation; EAC; Level VI; RoHS; VCCI; WEEE; RCM; CB 62368;10100-240V ̴ , 50/60Hz5 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178275*39.8*24.8

GTM46161-16V.V-USB2A
GTM46161-16V.V-USB2A, Medical Power Supply, 60601-1-4th Ed. , Wall Plug-in, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, Blade Options for Q Series Wall Plug-in Power Supplies, Output Rating: 16 Watts, Power rating with convection cooling (W) , 5-5.5V in 0.1V increments, Approvals: PSE; CB 60950; CB 62368; CE; China RoHS; Double Insulation; EAC; LPS 62368; Morocco; LVD 60335; CB 60601-1; ETL;16100-240V~, 50-60 Hz5-5.2 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178241.0 x 70.0 x 35.1

GTM46161-16V.V-USB1A
GTM46161-16V.V-USB1A, Medical Power Supply, 60601-1-4th Ed. , Wall Plug-in, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, Blade Options for Q Series Wall Plug-in Power Supplies, Output Rating: 16 Watts, Power rating with convection cooling (W) , 5-5.5V in 0.1V increments, Approvals: CCC; PSE; CE; RCM; CB 62368; CB 60950; China RoHS; Double Insulation; EAC; LPS 62368; Ukraine; WEEE; VCCI; Morocco; LVD 60335; CB 60601-1; ETL;16100-240V~, 50-60 Hz5-5.5 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178241.0 x 71.0 x 31.5

GTM86100-10VV-W2
GTM86100-10VV-W2, ITE / Medical Power Supply, Wall Plug-in, AC Adaptor Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60Hz, NEMA 1-15P, North America Blades, Class II 2 Conductors, Output Rating: 10 Watts, Power rating with convection cooling (W) , 5-5.2V in 0.1V increments, Approvals: CB 60335; RCM; China RoHS; Double Insulation; Level VI; RoHS; VCCI; WEEE; cETLus 60601-1 3rd; EAC; CB 62368; Ukraine; ETL 62368; PSE; LPS 62368;10100-240V~, 50-60Hz5 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178269*28.8*40.3

GTM86100-10VV-W2-USB
GTM86100-10VV-W2-USB, ITE / Medical Power Supply, Wall Plug-in, AC/DC Switching Adapter with USB Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, NEMA 1-15P, North America Blades, Class II 2 Conductors, Output Rating: 10 Watts, Power rating with convection cooling (W) , 5-5.2V in 0.1V increments, Approvals: CB 60335; CB 62368; PSE; ETL 62368; LPS 62368; cETLus 60601-1 3rd; China RoHS; Double Insulation; Level VI; RoHS; VCCI; WEEE;10100-240V~, 50-60 Hz5-5.1 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178251.5*23.5*38.5 +/-0.3

GTM46161-16V.V-USB
GTM46161-16V.V-USB, ITE / Medical Power Supply, 60601-1-4th Ed. , Wall Plug-in, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, Blade Options for Q Series Wall Plug-in Power Supplies, Output Rating: 16 Watts, Power rating with convection cooling (W) , 5-5.5V in 0.1V increments, Approvals: CCC; RCM; UL 1310; ETL; CB 60601-1; S-Mark IEC/EN 60601-1; S-Mark 60950; EAC; CB 62368; LPS 62368; Morocco; CB 60335; Double Insulation; Ukraine; RoHS; China RoHS; Level VI; WEEE; ETL; CE; FCC; CAN ICES-3; PSE; IP20; CB 60950;16100-240V~, 50-60 Hz5-5.5 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178241.0 x 71.0 x 31.5

GTM91120-30VV-T2
GTM91120-30VV-T2, Medical/ITE/Household use Power Supply, 60601-1-4th Ed. , Wall Plug-in+Desktop Combination, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, IEC 60320/C8 AC Inlet connector, Output Rating: 30 Watts, Power rating with convection cooling (W) , 5-48V in 0.1V increments, Approvals: S-Mark IEC/EN 60601-1; SIQ 61558; EAC; cUL 60950; LPS 60950; CB EN/IEC 60335-1; RoHS; Level V; CE; China RoHS; LPS 62368; PSE; WEEE; Double Insulation; VCCI; Ukraine; FCC; SIQ; Book 60601; Fuse 60335; CB 60601-1; CB 60950; IEC 60335; IEC/EN60601-1; IEC/EN60950-1; CCC; cRUus; CE; RCM; S-Mark 60950; CE; ETL; CB 60335; PSE; PSE; PSE; PSE; GS; IEC 61558-1; Fuse 60335; IP40; IP52; Ta:40°C;30100-240V~, 50-60 Hz5-48 VV(L)101.77x(W)47.47x(H)36.7

GTM46402-40VV-x.x-Q
GTM46402-40VV-x.x-Q, Medical/ITE/Household use Power Supply, 60601-1-4th Ed. , Wall Plug-in, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, Blade Options for Q Series Wall Plug-in Power Supplies, Output Rating: 40 Watts, Power rating with convection cooling (W) , 5-48V in 0.1V increments, Approvals: cETLus 60950-1; cETLus 60601-1-11; UL 1310; PSE; RCM; cETLus 60601-1 3rd; CB 60335; CB 60950; cETLus 60950; CB 60601-1; Fuse 60335; Fuse 60335; cETLus UL1310; UL 1310; SELV; CB 62368; EAC; LPS 60950; 2MOPP; Singapore (24V); CCC; PSE; PSE; LPS 62368; ETL 62368; CE; Ukraine; VCCI; RoHS; Level VI; FCC; CAN ICES-3; IP52; Double Insulation; WEEE;40100-240V~, 50-60 Hz5-48 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178243.5 x 74.0 x 35.3

GTM86100-10VV-W2E-USB
GTM86100-10VV-W2E-USB, ITE / Medical Power Supply, Wall Plug-in, AC/DC Switching Adapter with USB Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60Hz, European CEE 7/16 configuration:EN 50075 Europlug 2 PIN, Output Rating: 10 Watts, Power rating with convection cooling (W) , 5-5.2V in 0.1V increments, Approvals: CB 60335; Ukraine; S-Mark IEC/EN 60601-1; EAC; CB 62368; CE; China RoHS; Double Insulation; Level VI; RoHS; VCCI; WEEE;10100-240V~, 50-60Hz5 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178251.5*23.5*38.5 +/-0.3

GTM86100-10VV-W2C-USB
GTM86100-10VV-W2C-USB, ITE / Medical Power Supply, Wall Plug-in, AC/DC Switching Adapter with USB Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, China GR 2099 configuration: 2 pins, Class II, Output Rating: 10 Watts, Power rating with convection cooling (W) , 5-5.2V in 0.1V increments, Approvals: CB 60335; CCC; EAC; CB 62368; CE; China RoHS; Double Insulation; Level VI; RoHS; VCCI; WEEE;10100-240V~, 50-60 Hz5 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178251.5*23.5*38.5 +/-0.3

GTM96900P90VV.V-T2
GTM96900P90VV.V-T2, ITE / Medical Power Supply/Class 2/Household Power Supply, 60601-1-4th Ed. , Desktop/External, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, IEC 60320/C8 AC Inlet connector, Class II, Non-Earth Ground (aka "Figure-8"), Output Rating: 90 Watts, Power rating with convection cooling (W) , 12-54V in 0.1V increments, Approvals: CAN ICES-3; cETLus 60601-1-11; UL 1310; cETLus; CB 61347; RCM; LPS 60950; CCC; Ukraine; EAC; ETL 62368; LPS 62368; S-Mark 60950; CB 60950; ETL; ETL; CB 60335; CB 62368; ETL; CB 60601-1; S-Mark; CE; China RoHS; Double Insulation; IP41; Level VI; Patent US9838207B2; RoHS; VCCI; WEEE; PSE; PSE; PSE;90100-240V~, 50-60 Hz12-54 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782149.38 x 62.6 x 33.5 +/-1.0

GTM96900P90VV.V-T3
GTM96900P90VV.V-T3, ITE / Medical Power Supply/Class 2/Household Power Supply, 60601-1-4th Ed. , Desktop/External, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60Hz, IEC 60320/C14 AC Inlet Connector, Class I, Earth Ground, Output Rating: 90 Watts, Power rating with convection cooling (W) , 12-54V in 0.1V increments, Approvals: CB 61347; RCM; LPS 60950; CCC; Patent US9838207B2; VCCI; EAC; IP41; cETLus 60601-1-11; UL 1310; cETLus 60950-1; Singapore (12V); ETL 62368; LPS 62368; CB 60950; ETL; ETL; CB 60335; S-Mark 60950; CB 62368; ETL; CB 60601-1; S-Mark; CE; China RoHS; Class I;Level VI; RoHS; Ukraine; WEEE; PSE; PSE; PSE;90100-240V~, 50-60Hz12-54 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782149.3 x 62.8 x 34.0 +/-1.0

GTM96180-18VV-T2
GTM96180-18VV-T2, ITE / Medical Power Supply/Class 2/Household Power Supply, 60601-1-4th Ed. , Desktop/External, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, IEC 60320/C8 AC Inlet connector, Class II, Non-Earth Ground (aka "Figure-8"), Output Rating: 18 Watts, Power rating with convection cooling (W) , 5-48V in 0.1V increments, Approvals: IP42; CB 62368; CB 60950; LPS 62368; 230V CoC Tier 2; EAC; cETLus 60601-1 3rd; CE; China RoHS; Level VI; LPS 60950; RoHS; Ukraine; VCCI; WEEE; FCC; CAN ICES-3; CB 61558-2-16; RCM; S-Mark 60950; ETL; Double Insulation; CCC; CE; CB 60335; cETLus UL1310; Fuse 60335; Fuse 60335; PSE; PSE; PSE; CB 60601-1;18100-240V~, 50-60 Hz5-48 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782(L)87x(W)47x(H)32mm

GTM96700-BWWVV-F
GTM96700-BWWVV-F, Medical Power Supply, Open Frame/Internal, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, Molex 26-60-4050 5 Position Header Pin 1: Gnd, Pin 2: Removed, PIN 3: Neutral, Pin 4: removed, Pin 5: Line, Output Rating: 70 Watts, Power rating with convection cooling (W) , 5-56V in 0.1V increments, Approvals: ETL; ETL; CB 60601-1 2MOPP; CB 62368; S-Mark IEC/EN 60601-1 60950; CB 60950; Morocco; CE; China RoHS; Class I; EAC; RoHS; Ukraine; VCCI; WEEE;70100-240V~, 50-60 Hz5-56 VN/A101.6*50.8*30.5

GTM96700-CWWVV-F
GTM96700-CWWVV-F, Medical Power Supply, Open Frame/Internal, Regulated Switchmode AC-DC Power Supply AC Adaptor, , Input Rating: 100-240V~, 50-60 Hz, Molex 09-65-2058 5 Position Header Pin 1: Earth, Pin 2: Removed, PIN 3: Neutral, Pin 4: removed, Pin 5: Line, Output Rating: 70 Watts, Power rating with convection cooling (W) , 5-56V in 0.1V increments, Approvals: EAC; CB 60950; CB 62368; ETL; ETL; S-Mark IEC/EN 60601-1 60950; Morocco; CB 60601-1; CE; China RoHS; Class I; CB 60601-1 2MOPP; RoHS; Ukraine; VCCI; WEEE;70100-240V~, 50-60 Hz5-56 VN/A127x76.2x25

GTM86100-10VV-W2U-USB
GTM86100-10VV-W2U-USB, ITE / Medical Power Supply, Wall Plug-in, AC/DC Switching Adapter with USB Power Supply AC Adaptor, , Input Rating: 100-240V ̴ , 50/60Hz, UK BS 1363, 2 Blade w/Dummy Ground Class II, Output Rating: 10 Watts, Power rating with convection cooling (W) , 5-5.2V in 0.1V increments, Approvals: CB 60335; WEEE; CE; China RoHS; Double Insulation; Level VI; RoHS; VCCI; EAC; CB 62368; Morocco;10100-240V ̴ , 50/60Hz5-5.2 VUSA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/178260.9*48.4*32.2

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