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 /  PTC Thermistor  /  NTC Thermistor


PTC Thermistors for Lighting Time Delay and Switching Starting Application

Lighting Switching PTC Thermistors Description

Lighting Switching PTC Thermistor are used when a load in series with the PTC thermistor has to be switched off after a time delay and when switching occurs frequently.
A typical application of switching PTC thermistor is the preheating of electrode in energy-saving lamps or fluorescent lamps. Switching PTC can also be used as a power resistor for loading a capacitor, for example in power supplies or in control units of production equipment.

Lighting Switching PTC thermistor Application

It's applicable to various types of fluorescent lamp, electronic ballast and electronic energy-saving lamp. The PTC can be connected across the lamp resonator without changing the circuits. It can change hard start of the ballast and electronic energy-saving lamp to preheated start and the preheating time of the filament can come up to 0.4-2 seconds, which will extend the service life of the fluorescent tube by over 4 times.

Switching PTC thermistors Operating Principle

Lighting Switching PTC thermistor Application CircuitThe application of the PTC thermistor to achieve preheated start is as follows: Immediately after power is switched on, Rt is in normal temperature state and its resistance is far lower than the C2 resistance. The current through C1 and Rt forms a return circuit to preheat the filament. After about 0.4-2 seconds, Rt joule heat temperature exceeds Curie point Tsc and skips into high resistance state of far higher than C2 resistance. The current passes through C1 and C2 to form a return circuit, which causes L resonance and produces high voltage to light the fluorescent tube.


PTC thermistors lighting time delay switch off characteristics
PTC Thermistors Delay operation of relay
Circuit of PTC Thermistors Delay operation of relay
Lighting Switching PTC Thermistors Dimensional Drawings

Lighting Switching PTC thermistors Dimensional DrawingsPart

Dimension (mm)

Dmax

Tmax

Fd

F

AMZ31-03 series

4.5mm

5.0mm

0.5mm

5.0mm

AMZ31-05 series

6.5mm

5.0mm

0.6mm

5.0mm

AMZ31-07 series

8.0mm

5.0mm

0.6mm

5.0mm

AMWEI PTC Thermistor for Lighting Time Delay and Switching Starting Application Data Sheet

Part No.

Switching
Temperature

(Centigrade)

Resistance

at +25

(ohm)
R25

Max. Voltage

(vAC)

AMZ31-03 series

AMZ31-03M151N500

80C 7 C

150 ohm 30%

500V

AMZ31-03M271N650

270 ohm 30%

650V

AMZ31-03M391N650

390 ohm 30%

650V

AMZ31-03M681N800

680 ohm 30%

800V

AMZ31-03M102N800

1000 ohm 30%

800V

AMZ31-03M152N800

1500 ohm30%

800V

AMZ31-03M332N800

3300 ohm 30%

800V

AMZ31-03N151N420

100C 7C

150 ohm 30%

420V

AMZ31-03N271N500

270 ohm 30%

500V

AMZ31-03N391N650

390 ohm 30%

650V

AMZ31-03N561N650

560 ohm 30%

650V

AMZ31-03N681N650

680 ohm30%

650V

AMZ31-03N102N800

1000 ohm 30%

800V

AMZ31-03N152N800

1500 ohm30%

800V

AMZ31-03P151N420

110C7C

150 ohm 30%

420V

AMZ31-03P271N500

270 ohm 30%

500V

AMZ31-03P331N500

330 ohm 30%

500V

AMZ31-03P391N500

390 ohm 30%

500V

AMZ31-03P561N650

560 ohm 30%

650V

AMZ31-03P821N650

820 ohm 30%

650V

AMZ31-03P102N650

1000 ohm 30%

650v

AMZ31-05 series

AMZ31-05M151N650

80C7C

150 ohm 30%

650V

AMZ31-05M175N650

175 ohm 30%

650V

AMZ31-05M271N650

270 ohm 30%

650V

AMZ31-05M391N800

390 ohm 30%

800V

AMZ31-05M561N800

560 ohm 30%

800V

AMZ31-05M102N800

1000 ohm 30%

800V

AMZ31-05M222N800

2200 ohm 30%

800V

AMZ31-05N151N650

100C 7C

150 ohm 30%

650V

AMZ31-05N175N650

175 ohm 30%

650V

AMZ31-05N271N650

270 ohm 30%

650V

AMZ31-05N391N650

390 ohm 30%

650V

AMZ31-05N561N800

560 ohm 30%

800V

AMZ31-05N102N800

1000 ohm 30%

800V

AMZ31-05P151N500

110C 7C

150 ohm 30%

500V

AMZ31-05P175N500

175 ohm 30%

500V

AMZ31-05P271N650

270 ohm 30%

650V

AMZ31-05P391N650

390 ohm 30%

650V

AMZ31-05P561N800

560 ohm 30%

650V

AMZ31-05P681N800

680 ohm 30%

800V

AMZ31-05P102N800

1000 ohm 30%

800V

AMZ31-07 Series

AMZ31-07M70RN650

80C 7C

70 ohm 30%

650V

AMZ31-07M101N650

100 ohm30%

650V

AMZ31-07M151N650

150 ohm 30%

650V

AMZ31-07M221N800

220 ohm 30%

800V

AMZ31-07M271N800

270 ohm30%

800V

AMZ31-07M391N800

390 ohm 30%

800V

AMZ31-07M681N900

680 ohm30%

900V

AMZ31-07N70RN650

100C7C

70 ohm 30%

650V

AMZ31-07N101N650

100 ohm 30%

650V

AMZ31-07N151N650

150 ohm 30%

650V

AMZ31-07N221N800

220 ohm 30%

800V

AMZ31-07N271N800

270 ohm 30%

800V

AMZ31-07N331N800

330 ohm 30%

800V

AMZ31-07N391N800

390 ohm 30%

800V

AMZ31-07N561N900

560 ohm 30%

900V


AMWEI Lighting Switching PTC thermistors Code
Reference information of PTC thermistors for lighting time delay and switching preheated starting applications

1. The switching time Ts can be approximated as follows:

Ts=Cth .V.(TRef-TA)/P
TRef Reference temperature of PTC thermistor
TA Ambient temperature
Cth Heat capacity of PTC thermistor
V PTC thermistor volume
P Switch-on power of PTC thermistor

This shows that the switching time can be influenced by the size of the PTC thermistor, its reference temperature and the power supplied. Switching time are lengthened by increasing the volume or the reference temperature, high power consumption by the PTC thermistor, on the other hand, results in short switching time.

2. Single capacitor starting circuit has higher demand on PTC thermistor voltage withstanding capacity, general required withstanding voltage >800V.

3. PTC thermistor reliability can be increased through higher resistivity, higher resistivity PTC thermistor shall be chosen first at the premises of satisfying starting characteristics.

Reference Information for Lighting Watts Corresponding to AMWEI PTC thermistor parts

1. Below 15W light , AMZ31-03 series.
2. 15-28W light, AMZ31-05 series.
3. 28-56W light, AMZ31-07 series.
4. Around 60W light, AMZ31-08 series.

In the same dimension and the switching temperature, the lower the light watt, the higher the resistance at 25 centigrade (R25). The higher the R25, the higher the voltage withstanding capacity.


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