LINE POWER SUPPLIES Low-Loss Supplies for Line Powered EnOcean Modules

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1 Lw-Lss Supplies fr Line Pwered EnOcean Mdules A line pwer supply has t ffer the required energy t supply the actuatr electrnic and t supply the EnOcean TCM/RCM radi cntrl mdule. This paper cntains sme cnsideratins abut line pwer supply circuitries with respect t lw pwer lss in standby peratin, circuitry peratin in a wide vltage range, and lw bill f material. Befre designing the pwer supply, please als cnsult the applicatin nte AN101 POWER SUPPLY LAYOUT that cntains sme layut design ntes t avid electrmagnetic interference (EMI). EMI can strngly reduce the TCM/RCM radi range perfrmance. 1. GENERAL POWER SUPPLY CONSIDERATIONS In buildings the actuatr circuitry is ften lcated within a junctin bx. The lad shuld be switched n and ff r shuld be dimmed by radi cntrl. Tw typical installatins can be fund. In the first case the neutral cnductr N is available, accrding t Figure 1. In the secnd case the neutral cnductr N is nt available, accrding t Figure 2. Often such a situatin is given if a cnventinal light switch in a wall bx shall be replaced by an EnOcean radi switch actuatr. EnOcean Subject t mdificatins Hlger Eggert & Armin Anders Nvember 2008 Page 1/ 9

2 If the neutral cnductr N is available a Parallel Pwer Supply PPS can be simply used t pwer the actuatr electrnics, accrding t Figure 3. If the neutral cnnectr is nt available, a PPS is nt sufficient. Accrding t Figure 4 supply vltage is nly available as lng as the switch is pen. As sn as the switch is clsed n vltage difference is available anymre (The prtected earth must nt be used as neutral cnductr if it is available because f safety reasns!). In this case an additinal Serial Pwer Supply SPS is required, accrding t Figure 5. The later described cmbinatin f a PPS and a SPS will give this pssibility t supply EnOcean radi receiver withut having a neutral cnductr by using nly the available tw wires in a usual wall junctin bx. EnOcean Subject t mdificatins Hlger Eggert & Armin Anders Nvember 2008 Page 2/ 9

3 2. LOW-LOSS POWER SUPPLIES 2. 1 Lw-Lss Parallel Pwer Supply (PPS) In applicatins were N is available a simple PPS like Figure 6 is used typically. Disadvantage f this pwer supply cncept is the pr efficiency. An utput pwer f arund 0.1W is required t pwer a typical radi receiver and the typical stand-by pwer dissipatin f such a simple pwer supply is arund 1.3W. Figure 6: Typical lw efficiency pwer supply (apprx k units). Lw unit pwer cnsumptin is imprtant, because the pwer supply is permanently in peratin, als in radi receiver standby mde when the lad is switched ff. EnOcean has prttyped a high efficiency PPS that allws very efficient line pwering f radi mdules. It perates in a very wide vltage range and can replace existing pwer supplies in a green manner. Key Features f the Lw-lss PPS Prttype: Output pwer: 3.3V r 5.0V, e.g. 35mA Input vltage range: Operating frm 15Vac t 307Vac Pwer cnsumptin: 0.3W at 110Vac r 0.5W at 230Vac at 0.1W utput pwer Csts: < k units EnOcean Subject t mdificatins Hlger Eggert & Armin Anders Nvember 2008 Page 3/ 9

4 Descriptin Symbl Min Typ Max Units Cmment Input Vltage V IN VAC 2 Wire n P.E. Frequency f LINE 47 50/60 64 Hz Output Output Vltage 1 V OUT V ± 5% Output Ripple Vltage 1 V RIPPLE1 135 mv 20 MHz bandwidth Output Current 1 I OUT A Ttal Output Pwer Cntinuus Output Pwer P OUT 0.1 W Peak Output Pwer P OUT_PEA K 0.33 W Efficiency Full Lad η % Measured at P OUT 25 C Ambient Temperature T AMB 0 70 C Free cnvectin, sea level Figure 7: Typical technical data (3V versin), cnnecting diagram and prttype f the high efficiency PPS EnOcean Subject t mdificatins Hlger Eggert & Armin Anders Nvember 2008 Page 4/ 9

5 2. 1 High-Efficiency Serial Pwer Supply (SPS) Picture 8 shws the principle cnfiguratin f a SPS. Accrding t Figure 5, supply vltage is nly available if the switch is pened. Disadvantage is the very pr efficiency if it is realized by an hmic vltage drp nly. Fr generatin f e.g. 3V/35mA utput pwer a resistrs vltage drp f minimum 0.5V is required (The best step up cnverter starts at 0.5V). At a lad current f 10 A the pwer lss is 5W, that results in prbably critical unit internal heating! Figure 8: Principle cnfiguratin f a Serial Pwer Supply EnOcean has prttyped a special high efficiency serial pwer supply. Key Features f EnOcean SPS: Output pwer: 1.5V/3.3V/5.0V, e.g. 35mA Input vltage range: Operating frm 15Vac t e.g. 307Vac Pwer cnsumptin: 0.1W at 110Vac r 0.1W at 230Vac Csts: Belw k units Figure 9: Cnnecting diagram and prttype f the high efficiency EnOcean SPS EnOcean Subject t mdificatins Hlger Eggert & Armin Anders Nvember 2008 Page 5/ 9

6 3. TYPICAL APPLICATIONS 3.1 PPS fr radi actuatrs in a junctin bx with neutral cnductr If the phase and a neutral cnductr are permanently available, the described PPS ffers a lw-lss and wide vltage range slutin fr supplying the radi electrnics f RCM r TCM radi cmmunicatin mdule. In cmparisn t ther typical supplies the lw-lss PPS ffers 50% reductin f stand-by pwer lsses. 3.2 PPS fr radi Dimmers withut neutral cnductr At dimmer applicatin nly a part f sine wave is used fr lamp current supply. Fr example the shaded part f the sine wave in Figure 11 is nt used and the vltage drp between zer crssing and leading edge can be used t pwer a TCM mdule via a energy strage capacitr. The lw-lss PPS ffers a gd apprach fr radi dimmers because f its high efficiency in a wide vltage range. Vcc Figure 10: Lw-lss PPS ffers a gd apprach t supply high efficiency dimmers Figure 11: TCM pwered by PPS phase cntrl EnOcean Subject t mdificatins Hlger Eggert & Armin Anders Nvember 2008 Page 6/ 9

7 3.3 PPS/SPS fr switching actuatrs withut neutral cnductr Fr switching applicatins withut neutral cnductr, e.g. in a wall bx, the PPS can perate in cmbinatin with the SPS like shwn in the Figure 12. The peratin f the PPS is serial in the supply current f the lad. If the serial lad current is 0.1A fr a minimum the SPS is able t generate 1.5V, 3.3V r 5.0V by phase cntrl. This allws peratin at very lw switching lads like 10W at 110V in US. Depending n the used pwer transistr and the switching relay the SPS can be laded as well with high currents like 10A and mre. Figure 12: PPS in cmbinatin with the SPS fr high efficiency supply f a RCM r TCM mdule in a light switch junctin bx withut neutral cnductr 3.4 Key Features f Lw-lss PPS/SPS Pwer Supply The prttyped PPS/SPS pwer supply system is designed fr switching applicatins withut neutral cnductr. With its lw lss in a very wide vltage and current range it is pssible t realize switching actuatrs with a brad lad range and t supply EnOcean radi electrnic with excellent stand-by efficiency. Please nte that the PPS/SPS pwer supply des nt wrk expedient with diming applicatins. The key features f the prttyped PPS/SPS pwer supply are as fllws: Generatin f dc-utput fr pwer supply f TCM r RCM (1.5V, 3.3V r 5.0V) Easy t install: N neutral cnductr required This allws easy replacing f a cnventinal light switch by an EnOcean radi switch Very flexible lad range: The lads can be very lw pwer flurescent lamps as well as high pwer bulbs EnOcean Subject t mdificatins Hlger Eggert & Armin Anders Nvember 2008 Page 7/ 9

8 The lads can be capacitive r inductive as well Lw lamp current dwn t 100mA is sufficient High lamp currents such as 10Aac r 2300W can be handled Operatin even frm minimal remaining vltage f 15Vac is sufficient t Operatin at high supply vltage like 305V can be handled Lw lss, high efficiency Figure 13: TCM radi mdule, lad relay, energy strage capacitrs and the transfrmer f the PPS Figure 14: The ttal switching receiver electrnics fits int a standard in-wall unit (PPS and SPS pwer supplies, TCM radi mdule, bi-stable switching relay) EnOcean Subject t mdificatins Hlger Eggert & Armin Anders Nvember 2008 Page 8/ 9

9 3.5 SPS fr sensr applicatins withut neutral cnductr The SPS can als be used fr ther applicatins, fr example remte lad currents r temperature measurements withut neutral cnductr. The EnOcean TCM transceiver mdule r the STM sensr transmitter mdule bth can be easily supplied by the SPS. Vcc Figure 15: TCM r STM radi mdules can be easily supplied by the SPS 4. DEVELOPMENT STATUS Rle f EnOcean This paper describes prttypes that prve the technical feasibility f the slutin t OEMs. The EnOcean pwer supply cncepts are prven fr labratry use but are nt develped t a final prduct yet. Patents are pending. EnOcean ffers the circuitry details f the high efficiency PPS and the SPS prttypes n a licensing base. EnOcean sees itself as a cmpnent and technlgy supplier, which prvides OEM custmers with energy generatrs, energy management, radi cmpnents, and cmmunicatin firmware. The custmers f EnOcean develp and prduce the final devices (pwer mdules, husings, etc.), have system integratin cmpetence (cntrl centre, cntrl algrithms, actuatrs, etc.), and access t final prduct market. Disclaimer The infrmatin prvided in this dcument describes typical features f the EnOcean radi system and shuld nt be misunderstd as specified perating characteristics. N liability is assumed fr errrs and / r missins. We reserve the right t make changes withut prir ntice. Fr the latest dcumentatin visit the EnOcean website at EnOcean Subject t mdificatins Hlger Eggert & Armin Anders Nvember 2008 Page 9/ 9