Anil Bali - Deki Electronics

Issue 2 / 2014
CHARGE
A Technical News Journal from Deki Electronics Ltd
November 2014
Editor’s Desk
Employee Motivation Survey
Dear Reader,
More than 60% of Deki’s sales are in the lighting
segment where, whilst the growth of the CFL market has
declined, LED bulbs are fast gaining ground. In fact, most
of the large CFL manufacturers are now focusing on
LEDs.
The Ministry of Power, Government of India, has
decided to give two LED bulbs per household at Rs 10
each to households in Andhra Pradesh through Energy
Efficiency Services Ltd (EESL). EESL will procure LED
bulbs in bulk from the manufacturers and then sell to
households at the special price. Distribution companies
will repay EESL from the ensuing savings in power in 5 to
8 years. This model is a joint outcome of Bureau of
Energy Efficiency (BEE), EESL and the distribution
companies. EESL completed procurement of 2 million
LED bulbs in the beginning of October 2014 as against
the total requirement of 7.4 million in Andhra Pradesh. It is
expected that other states will follow the Andhra Pradesh
model.
Deki has a full range of capacitors for the LED driver.
The technical write up in this issue of Charge talks of the
various types of drivers available in the market and the
film capacitors required for different applications. There
are a number of options available to the customer where
Grade 1 is the most recommended and Grade 5 the least.
And, as always, we look forward to your comments and
suggestions.
R
Anil Bali
External Customer Satisfaction Survey
A
t Deki Electronics we have been conducting a
Customer Satisfaction Survey every six months for the
last 10 years, with our major customers. In the most recent
survey, conducted in July 2014 for the January-June 2014
period we obtained a 84.4% satisfaction rating from our
customers. One of the reasons for the rising satisfaction
scores is that we ask our customers to highlight two
parameters that they would like Deki to focus on in the
ensuing six months. This feedback results in an action plan
that is shared with the customers. Closing the loop thus,
indicates Deki's customer orientation and this has been
appreciated by our customers.
eaders may be aware that Deki also conducts an
employee satisfaction survey every six months. In this
survey all the direct employees are asked fifteen
questions pertaining to:
1. their work environment
2. salary
3. satisfaction level
4. growth opportunity
5. knowledge of targets, standard specifications,
operating procedures, etc.
They give marks to each question and this is then
consolidated into a report that compares the results of
the most recent survey with that of the previous months.
The report, along with the action points for improvement,
are discussed with all the employees in an “Open House”
by our Managing Director, Mr Vinod Sharma.
The total score in the August 2014 survey was 86% and
based on the feedback we have identified two areas for
improvement in work environment. With the installation of
new machines by December 2014, as part of Deki’s
expansion programme, these issues too should get
resolved.
Training in Deki
R
eaders may be aware that training at Deki receives
utmost importance. As an integral part of continual skill
enhancement, it has been growing consistently. There was
a 64% jump in training hours, from 2580 hours to 4234
hours, in 2012. This increased further to 4407 hours per
month in 2013. With three months to go we are on track for
an increase in 2014 as well. As part of the system,
detailed stage wise training is conducted in which
knowledge of the process and the machines is imparted.
This is followed by a written test in which an employee
must score a minimum of 80% at critical stages to qualify
to run the machine. Deki’s training modules have been well
recognised and serve as a benchmark for component
manufacturers.
Deki spends a considerable amount of time in training
External customer satisfaction survey results
For your FREE subscription, please contact Deki Electronics Ltd,
B-20 Sector 58, NOIDA 201 301. Phone +91 120 2585457, 2585458
Fax +91 120 2585289 E-mail [email protected]
www.dekielectronics.com
CHARGE
A Technical News Journal from Deki Electronics Ltd
APPLICATION NOTES
Low Cost LED Driver
High End LED Driver (High Efficiency
Resonant Power supply)
The capacitive power supply is the economic version of low
power LED driver. It has less component count and more
efficient for low power LED drivers. The capacitor Cx acts
as a voltage dropper.
Cx
In order to achieve a very high efficiency of over 95%, a
resonance based power supply is employed in high power
LED drivers for street light, high bay light applications, etc.
Resonant elements L, C employed. Combination of L and C
forms various types of circuits out of which typical popular
designs are series resonant power supply, parallel resonant
power supply, LLC resonant power supply.
Fig: Low Cost LED Driver
R1
~
+
–
220V AC
4×1N4007
~
R2
C1
Film capacitor requirement:
Cap Function Type
Cx
Voltage
dropping
Voltage
Requirement
MPET/MPP-AC/ 400V DC, 500V DC,
MPET-F/MPP-F/ 275V AC, 305V AC,
MPET-AC
310V AC
(High Reliability)
Cap
Range
0.1
to
2.2uF
Model 1: Series Resonant circuit
High End LED Driver (Power factor corrected
Flyback)
The Flyback power supply is the most commonly used high
end LED medium power LED driver upto 150W. It consist of
following sections, EMI filter, Input Bridge rectification, PFC
and Gate Drive section, Snubber, Power Transformer,
Output rectification, Output filter.
Model 2: Parallel Resonant circuit
Fig: High End LED Driver (Power factor corrected Flyback)
Film capacitor requirement:
Cap
Function
Type
MKP-X2
MKP-Y2
250/275V AC
C1
EMI
Suppression
EMI
Suppression
Smoothing
Voltage
Requirement
275/305/310V AC
400/450/500/
630V DC
C2
Snubber
MPET/
MPP-AC/
MPET-F/
MPP-F/
MPP-DC
MPP-DC/
PP-MPP
Cap
Range
0.004
to 10uF
0.001
to 0.1uF
0.1
to 2.2uF
400/630/1000/
1250/1600V DC
0.0022
to 0.47uF
Cx
Cy
Model 3: LLC Resonant circuit
2
CHARGE
A Technical News Journal from Deki Electronics Ltd
APPLICATION NOTES
High End LED Driver (Buck Power Supply)
In case of high end low power applications where very low
output voltage is required, buck based (step down) LED
driver is employed to handle larger output currents as well.
Film capacitor requirement:
Cap Function
Type
Voltage
Cap
Requirement
Range
C1 EMI
MKP-X2 275/305/310V AC 0.004
Suppression
to 10uF
LLC- Schematic Circuit
Film capacitor requirement:
Cap Function
Type
C1
Resonant
capacitor
C6
EMI
Suppression
Smoothing
C7
Voltage
Requirement
MPP-DC/ 630/1000/1250/
DPSH/
1600V DC
MPP-MPP/
PP-MPP
MKP-Y2 250/275V AC
MPET/
MPP-AC/
MPET-F/
MPP-F/
MPP-DC
400/450/500/
630V DC
Cap
Range
0.001
to 0.47uF
0.001
to 0.1uF
0.1
to 2.2uF
Buck Power Supply- Schematic Circuit
Recommended Capacitors for Applications:
Application/Function
Grade 1
Grade 2
Grade 3
Grade 4
Grade 5
Voltage dropping
MPET-AC (High reliability)
MPP-AC
MPP-F
MPET-F
MPET-AC
Smoothing
MPP-AC/MPP-DC
MPP-F
MPET-F
MPET-AC
-
Snubbing
PP-MPP
MPP-DC
-
-
-
Resonance
PP-MPP
MPP-MPP
DPSH
MPP-DC
-
EMI Suppression Line to Line
IS/MKP-X2
MPP-AC
MPET-AC
-
-
EMI Suppression Line to Ground
IS/MKP-Y2
Miniature MPP-F Series for LED
Deki has developed a capacitor series for LED lights. This series is flame-proof and will fail in the safe mode. The
capacitor size is very compact and can easily fit in to the LED light.
Improving the life of a capacitor
1. Make sure that there are no hot-spots near the capacitor
2. Voltage across the capacitor should not be more than
the rated voltage
3. Select the capacitor as per the tables provided here
4. Ambient temperature should not be more than the
maximum operating temperature indicated
5. For temperatures in excess of 85° C please apply the
requisite voltage derating factor.
3
CHARGE
A Technical News Journal from Deki Electronics Ltd
Launch of the Swachh Bharat, Swachh Deki mission
Employee Suggestion Scheme
T
T
he Prime Minister of India, Mr Narendra Modi launched
the Swachh Bharat mission for a clean India as a tribute
to Mahatma Gandhi on his 150th birth anniversary in 2019.
Towards this dream, Deki Electronics took the initiative to
launch the Swachh Bharat, Swachh Deki mission on 2 Oct
2014 with 106 members of the Deki Team taking a pledge
to remain committed towards cleanliness. They spent 4
hours cleaning the company premises and its surrounding
as well as the park across, along with our MD, Mr Vinod
Sharma, our VP, Mr Anil Bali, our VP (Tech), Mr P Sankar
Raj and other HoDs.
The huge effort ended with some fun events followed by
lunch.
The Deki Team is ready for the Swachh Bharat, Swachh Deki mission
he suggestion scheme at Deki has been growing
continuously. Since the start of the scheme in 1999 we
have implemented 22,176 suggestions. In Deki parlance a
suggestion is treated as a suggestion only if implemented.
The scheme is very simple. An employee fills up a
suggestion form mentioning:
a) The present process
b) The proposed process
c) The savings/benefits from the proposed process.
The form is given to the section in charge who forwards it
to the committee with his remarks. The committee meets
every week and decides on the suggestions that have
merit and acceptable. All acceptable suggestions are
rewarded every week.
Average suggestions per month
From the Archives: An old article published in Mint, New Delhi is revisited
O
n February 21, 2010, Mint, New Delhi published an article by Prof Nirvikar Singh, professor of economics at the
University of California, Santa Cruz, titled "Budgeting for growth". The article discussed the problems of doing
business in India and their effect on small and medium enterprises in the country. Prof Singh showcased the success of
Deki Electronics, led by our Managing Director, Mr Vinod Sharma, in overcoming these problems. He used the example
of Deki in putting forth ideas on improving business efficiency in India.
Prof Singh recently revisited his article of 2010, and mentioned Deki's experience and growth at seminars in Stanford
and Harvard universities in the USA.
http://www.livemint.com/Opinion/odGqiJjBX4fveaoYcCDXoK/Budgeting-for-growth.html

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