Application and Research of piezoelectric ceramic igniter

Subjected to a stress of the piezoelectric ceramic transducer may generate a high enough voltage to cause a spark between the electrodes so that the spark ignition combustion gas can be used, the device called a piezoelectric ceramic igniter. 

     In recent years has developed a variety of ignition systems that are based on a battery as a power supply or a permanent magnet to work, most of which require a transformer, and in some cases, require capacitors. The disadvantage is that the ignition system more complex, operating temperature, high humidity environment in the kitchen, and prone to failure. The piezoelectric ceramic ignition system is not so complicated, the electrical part of only one or two cylindrical piezoelectric ceramic material, the breakdown voltage required for the ignition of the piezoelectric ceramic is subjected to a mechanical stress from arising. 

     Piezoelectric ceramic igniters, ignition system volume can be greatly reduced, and work in hot, humid environment, which is widely used in gas stove, oven and other kitchen equipment and desktop igniter and lighters. 

     The voltage of the piezoelectric ceramic igniter 

     1 static stress 

     1) The performance of the open state: If the length L of a piezoelectric ceramic (PZT) is applied at both ends of an axial stress F3, in the open state (D = 0), the voltage V3 between the electrodes is given by the following equation: 

     2.jpg 

     For a given ignition PZT, d33, C, g33, L and so is the fixed value, so the output voltage V3 of the stress function F3 (Figure 1). 

1.jpg 

     In addition to the voltage level, the energy consumed by the spark ignition is an important factor for the gas. So that the mechanical energy generated by the source is Wf, all added to the PZT cylinder. If the PZT cylinder is left open, and no losses, are all forms of energy can be mechanical energy recovered. However, if connected to the load, a part of the electrical energy in the form of energy We recovered. So: Wf = We + Wm