JPS6042276Y2 - lighter ignition device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ignition device for a lighter that ignites combustion gas by a discharge spark.

Electronic lighters incorporating DC power sources such as batteries have been released in various forms due to the use of semiconductor integrated circuit ICs, the miniaturization of silver oxide batteries and lithium batteries, and the practical use of solar cells, among others. What is called an IC lighter is gaining popularity among a wide range of people from young people to adults.

The present invention relates to an ignition device for such an IC lighter, and will be described in detail below with reference to the drawings.

1 is a DC power source such as a lithium battery, silver oxide battery, solar cell, secondary battery, etc., 2 is a switch operated in conjunction with a fire extinguishing lid covering a nozzle that spouts combustion gas, and 3 is a DC power source 1 This is a blocking oscillation circuit that operates in oscillation due to the application of oscillation transistor 4 and oscillation transformer 5 as main components.

Reference numeral 6 denotes a rectifier circuit consisting of a diode connected to the secondary side of the oscillation transformer 5 of the oscillation circuit 3, which rectifies the boosted voltage obtained on the secondary side of the oscillation transformer 5.

7 is a storage capacitor in which the DC high voltage charge obtained from the rectifier circuit 6 is stored; 8 is a storage capacitor, for example, P that is turned on when the amount of charge stored in the capacitor 7 reaches a predetermined level.
A step-up transformer 9 is connected to the cathode side of the diode 8, and a discharge electrode 10 is provided on the secondary side of the transformer 9.
10, a discharge circuit 11 is formed.

Reference numeral 12 denotes an oscillation control circuit whose one end is connected to the charging path from the rectifier circuit 6 to the storage capacitor 7 and whose other end is feedback-coupled to the oscillation circuit 3.
A second transistor 13,14, a base resistor 15 and a collector resistor 16 wired to its base path and collector path, a Zener diode 17 provided in its emitter path, and a transistor turned on by the Zener voltage of the Zener diode 17. When the switching transistor 18 is on, the oscillation transistor 4 is turned off and the oscillation circuit 3 stops oscillating, and conversely, when the switching transistor 18 is off, the oscillation circuit 3 starts to oscillate.

That is, this first switching transistor 18 is turned on.
, OFF controls the oscillation operation of the oscillation circuit 3.

Reference numeral 19 denotes a photoswitch consisting of a light-emitting diode 20 and a phototransistor 21, and a gap is formed between the light-emitting diode 20 and the phototransistor 21 to the extent that a light-shielding object such as a cigarette or a pen can be inserted, so that the light-emitting diode 20 and the phototransistor 21 are connected to the outside of the lighter case. It is located in

Reference numeral 22 denotes a second switching transistor that performs switching operation when the phototransistor 21 is turned on and off, and when the switching transistor 22 is on, the first and second transistors 13 and 14 of the oscillation control circuit 12 and the first switching transistor 18 is turned off, and charges are accumulated in the storage capacitor 7 via the rectifier circuit 6.

The operation will be explained using the waveform diagram shown in FIG.

First, in an initial state in which the DC power supply 1 is not applied to the oscillation circuit 3, no charge is stored in the storage capacitor 7 and its terminal voltage Vc is O.

When the fire extinguishing lid is opened in this state, the switch 2 is automatically turned on in conjunction with the fire extinguishing lid, and the oscillation circuit 3 starts oscillating.

When the oscillation circuit 3 operates in oscillation, the oscillation transformer 5 induces a boosted voltage on the secondary side.

This boosted voltage is rectified by a rectifier circuit 6 and charges are stored in a storage capacitor 7.

Accumulation of charge in the storage capacitor 7 progresses, and after t1, the terminal voltage Vc reaches the Zener voltage Vz of the Zener diode 17, which is set slightly lower than the discharge voltage of the discharge circuit 11, that is, the breakover voltage Vbo of the switching diode 8. Then, the first and second transistors 13 and 14 of the oscillation control circuit 12 become conductive, turning the first switching transistor 18 on.

When the first switching transistor 18 is turned on, the base and emitter of the oscillation transistor 4 are short-circuited, and the oscillation circuit 3 stops its oscillation operation.

That is, the storage capacitor 7 is held in a charged state with a level slightly lower than the discharge level.

On the other hand, when the switch 2 is turned on, the light emitting diode 20 also emits light and irradiates the phototransistor 21 to bring the phototransistor 21 into a saturated state.

If a light-shielding object such as a cigarette is placed between the light-emitting diode 20 and the phototransistor 21, the light from the light-emitting diode 20 is blocked by the light-shielding object, and the phototransistor 21 is turned off.

When the photoswitch 19 is operated by the light shielding object in this way, the a[E power supply 1 is applied to the base of the second switching transistor 22 via the base resistor 23, so the second switching transistor 22 is ONL. Bypassing the base voltage of the first transistor 13 in the first stage connected to Darlington, the first transistor 13 is turned off.
Set to FF state.

Therefore, the first switching transistor 18 of the oscillation control circuit 12 is also turned off, and the oscillation transistor 4 resumes its oscillation operation.

When the oscillation circuit 3 starts its oscillation operation again, charge is further accumulated in the storage capacitor 7, which had accumulated a charge below the discharge level of the discharge circuit 11, that is, below the breakover voltage Vbo of the switching diode 8 due to the previous oscillation operation.

Then, after t2 after operating the photo switch 19, the second
As shown in the figure, charge accumulation progresses, and the terminal voltage Vc becomes the breakover voltage Vb of the switching diode 8.
When the voltage reaches 0, the switching diode 8 becomes conductive and the stored charge instantly flows to the primary side of the step-up transformer 9, generating a high voltage on the secondary side and generating a discharge spark at the discharge electrode 10.10.

This discharge spark ignites the combustion gas that is ejected and filled in the vicinity of the discharge electrode 10.10 in conjunction with the operation of the fire extinguishing lid.

After the photoswitch 19 is operated in this manner, one discharge spark is instantaneously generated.

Specific examples of the main circuit configuration are described below.

DC power supply 1...3V Oscillation transistor 4...2SC2274 (manufactured by Sanyo) Storage capacitor 7...2μF Switching diode...NFD15 (N
(manufactured by EC) Breakover voltage Vbo...106
V step-up transformer 9 winding ratio...1 near 4 Zener voltage Vz...95V Light emitting diode 20...5PS102 (manufactured by Sanyo) Phototransistor 21...5LP114
(Manufactured by Sanyo) According to such a configuration, the switch 2 closing part is approximately 0.
At 3SeC, the terminal voltage Vc of the storage capacitor 7 reaches the Zener voltage Vz, which is the operating voltage of the oscillation control circuit 12.The oscillation operation of the waist oscillation circuit 3 is temporarily stopped, and the switching diode 8 is turned off several tens of meters, seconds after operating the photo switch 19. The breakover voltage Vbo is reached.

Therefore, the operator automatically turns on the switch 2 by opening the fire extinguishing lid to light the cigarette.
Several tens of meters after the operation, the discharge circuit 11
generates discharge sparks, so the combustion gas can be ignited instantly after the user is conscious of operating the ignition switch.

On the other hand, if a light shield is left inserted between the light emitting diode 20 and the phototransistor 21, the oscillation control circuit 1
2 continues to be in the OFF state, the oscillation circuit 3 operates continuously without once stopping when the terminal voltage Vc of the capacitor 7 is less than the discharge level, as shown in FIG. 2, and the capacitor 7 is discharged intermittently.

Therefore, since discharge sparks are obtained intermittently between the discharge electrodes 10, 10, the combustion gas can be reliably ignited by the plurality of discharge sparks.

Since the ignition device of the lighter of the present invention is constructed as described above,
When the amount of charge stored in the capacitor is slightly lower than the discharge voltage of the discharge circuit, the oscillation operation of the oscillation circuit that stores charge in the storage capacitor via the rectifier circuit is stopped temporarily by the oscillation control circuit, and the light emitting diode and photo By inserting a light-shielding object such as a cigarette between the transistors, the stoppage of oscillation can be canceled, and by accumulating charge in the capacitor and raising the charge level above the discharge level, it is possible to generate a discharge spark in the discharge circuit. When the operator inserts a light shielding object such as a cigarette between the light emitting diode and the phototransistor, the accumulated charge in the storage capacitor instantly reaches the discharge level of the discharge circuit, generating a discharge spark and igniting the combustion gas. can.

Furthermore, when the photoswitch is continuously operated, the oscillation control circuit remains inactive, so the oscillation operation of the oscillation circuit continues and discharge sparks are generated intermittently, ensuring reliable ignition of the combustion gas.

[Brief explanation of drawings]

Figure 1 is an electrical circuit diagram showing the ignition device of the lighter of the present invention;
Figure 2 is a waveform diagram to explain its operation, and shows 1 a DC power supply, 3 an oscillation circuit, 7 a storage capacitor, 11 a discharge circuit, 12 an oscillation control circuit, and 19 a photoswitch. There is.

Claims (1)

[Scope of utility model registration request] An oscillation circuit whose main components include a DC power supply, an oscillation transistor and an oscillation transformer that operate in oscillation by the DC power supply, a rectification circuit connected to the secondary side of the transformer of this oscillation circuit, and a rectification circuit connected to the rectification circuit. a storage capacitor that stores electric charge; a discharge circuit that instantly discharges the electric charge and generates a discharge spark when the amount of electric charge stored in the storage capacitor reaches a discharge level; and one end connected to the storage capacitor from the rectifier circuit. The oscillation control circuit is connected to a charging path leading to the oscillation circuit, and the other end is feedback-coupled to the oscillation circuit, and the oscillation control circuit stops the oscillation operation of the oscillation circuit, and the photoswitch releases the stoppage of the oscillation operation caused by the control circuit. The circuit includes a Zener diode having a Zener voltage lower than the discharge voltage of the discharge circuit, and a switching transistor that operates when the amount of charge stored in the storage capacitor reaches the Zener voltage of the Zener diode to stop the oscillation operation of the oscillation circuit. An ignition device for a lighter, wherein the photoswitch includes a light emitting diode and a phototransistor, and the oscillation operation is restarted by inserting a light shielding object such as a cigarette between the light emitting diode and the phototransistor.