JPS6042283Y2 - Battery check circuit for battery type ignition system - Google Patents

Description

[Detailed description of the invention] The present invention is a battery-powered ignition device used for gas ignition of household gas appliances, etc., in which a light-emitting element such as a light-emitting diode emits light at the same time as the ignition operation of turning on a switch. Regarding the battery check circuit, which displays that the battery voltage is within the ignition range, and which is wired to prevent the battery from needing to be replaced or charged due to seasonal or other changes in the operating environment temperature, specifically. As shown in Japanese Utility Model Application Publication No. 53-148071, the voltage generated in the check winding or feedback winding wound around the core of the ignition oscillation transformer is converted into DC by a rectifier diode, and the signal current component is converted into DC by a resistor. The signal is passed through a low-pass filter consisting of a capacitor to remove the whiskers of the blocking oscillation waveform generated in the blocking circuit of the ignition circuit and other noise signals, and then applied to a programmable unijunction transistor (hereinafter abbreviated as PUT). When the applied voltage exceeds the safe working voltage, the PUT switches and lights up the light emitting element to indicate that the battery voltage is within the usable range, and a fixed resistor and thermistor resistor are installed between the anode and cathode of the PUT. A temperature compensation circuit is connected to compensate for temperature-related changes in the variable resistor that sets the above-mentioned safe operating voltage.

The purpose of the battery check circuit in a battery-powered ignition circuit is to indicate whether the potential of the positive electrode of the battery in use has fallen below the ignition capability due to the inability of the light-emitting element to emit light, and the purpose of the battery check circuit is to indicate whether the potential of the positive electrode of the battery in use has fallen below the ignition capability or not. must not emit light.

However, in a circuit configuration in which a check circuit is connected to a check winding or a feedback winding wound around the ignition transmission transformer of the ignition circuit to extract the check signal current component, the blocking oscillation waveform generated in the blocking circuit of the ignition circuit is This generates a mixture of noise components associated with whisker portion a (see Figure 1) and ignition operations, and these waveforms become potentials that cause the battery to lose its ignition ability or require replacement or charging. Regardless of whether the PUT is a switching element or not, the PU
It has been found that the breakover voltage may vary depending on the temperature of the environment in which the ignition device is used, leading to incorrect timing of battery replacement or charging. Sometimes.

The present invention aims to eliminate such deficiencies of conventional battery check circuits.

FIG. 2 shows a first embodiment of the present invention, which includes a battery 1, an ignition switch 2, and an ignition circuit 3.

The oscillation transformer 4 included in the ignition circuit 3 connects the primary winding 41 to the negative electrode of the battery 1 via the collector C1 emitter E of the oscillation transistor Tr, and connects the feedback winding 42 of the transformer 4 to the base B of the transistor Tr. Connect to
The blocking oscillator circuit 5 constitutes a blocking oscillator circuit 5 that positively feeds back an AC component having an opposite phase to the primary current of the primary winding 41 among the AC current induced in the feedback winding 42. The blocking oscillator circuit 5 is driven to induce an alternating current secondary current in the secondary winding 43 of the transmitting transformer 4, and the secondary current is rectified by the rectifier diode D1 to charge the capacitor C1. When a certain value is reached, the switching element 6 is driven to pass a voltage current of a certain level or higher, and the high voltage induced in the secondary winding 72 is discharged by discharging it to the primary winding 71 of the ignition transformer 7. is applied to each pole 8 to generate an intermittent ignition current.

Reference numeral 11 designates a check circuit of the present invention, in which a battery check winding 44 is wound around the core of the transmitting transformer 4, a rectifier diode D2 is passed through the output circuit 12 of the winding 44 as is known, and a resistor R2 is connected to the output circuit 12 of the winding 44. Passed through a low-pass filter f configured by a capacitor C2, and then connected to a rectifier diode D2.
A DC check signal is applied to the PUT, which is converted into a DC current by the filter f, and in which the whisker part a (FIG. 1) of the blocking oscillation waveform generated in the blocking circuit 5 and the high voltage waveform part of the noise component are cut off.

The PUT gate G has a variable resistor VR for setting the check voltage.
The check voltage setting circuit 13 with a light emitting diode LED inserted is connected and the terminal is connected to the negative pole of the battery 1, and the cathode K is connected to the light emitting display circuit 14 with a light emitting diode LED inserted, and the display circuit 14 is connected to the negative pole of the battery 1. Connecting.

Further, a thermistor resistor wh and a fixed resistor R are connected in parallel or in series as shown in the figure between the anode A and the cathode of the PUT to form a temperature compensation circuit 15.

In the signal component of the output circuit 12 filtered by the low-pass filter f in the above, the blocking oscillation waveform and the high voltage part of the noise waveform are removed by filtering and then applied to the PUT, and the applied potential is set to the variable resistor VR, for example, IV. When the anode breakover current exceeds the anode breakover current, a current flows from the anode A to the cathode K, causing the light emitting diode LED of the light emitting display circuit 14 to emit light. It is indicated by not lighting up that it is now necessary.

The temperature compensation circuit 15 corrects the change in the set voltage caused by the variable resistor VR of the check voltage setting circuit 13 due to changes in the operating temperature environment of the ignition device, and maintains the set voltage at a substantially constant value.

FIG. 3 shows a second embodiment of the present invention, in which the output circuit 12 is connected to the output terminal of the feedback winding 42, and the other circuit configurations are the same as the first embodiment.

As explained above, the filter f consisting of the low loss B2 and the capacitor C2 of the present invention prevents the light emission of a light emitting element such as a light emitting diode from being caused by the blocking oscillation waveform and noise signal caused by the blocking oscillation circuit of the ignition circuit, and the malfunction of the light emitting element. It has the effect of excluding the operating signal component that causes light emission, and stopping light emission very faithfully as soon as the battery voltage falls below the voltage set by the variable resistor.

FIG. 4 shows a measurement comparison curve of the relative luminous intensity of the circuit of the present invention and a check circuit without a filter f, and
Select voltage according to 1. When set to OV, in the present invention, as the potential of the positive electrode of the battery approaches the set voltage, the relative luminous intensity decreases sharply as shown by the solid line, and light emission is disabled just before the set voltage, but with the filter f. If not, the set voltage 1. due to the mixing of noise signal components.
Not only does it continue to emit light even below 0V, but only finally stops emitting light just before 0.9V, and the attenuation curve of relative luminous intensity has a slightly gentle angle, so the battery check function by stopping light emission lacks fidelity.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a blocking oscillation waveform, FIG. 2 is a connection diagram of the first embodiment of the present invention, FIG. 3 is a connection diagram of the second embodiment, and FIG. 4 is a comparison curve diagram. 1...Battery, 2...Ignition switch,
3...Ignition circuit, 8...Discharge pole, 1
1... Check circuit, 12... Output circuit, D2... Rectifier diode, R2...
・Resistance, C2... Capacitor, f...
Low-pass filter, VR...variable resistor, LED
......Light emitting diode, ■...Thermistor resistance, R...Fixed resistance, 15...Temperature compensation circuit.

Claims (1)

[Scope of utility model registration request] Connect the hair part of the blocking oscillation waveform consisting of the rectifier diode D2, resistor R2, and capacitor C2, and a low-pass filter for noise removal to the check circuit connected to the check winding or feedback winding wound around the core of the ignition transmission transformer, Furthermore, variable resistor VR for checking voltage setting
A programmable unijunction transistor PUT is connected, and the cathode of the PUT is connected to a light emitting diode LED, and a temperature compensation circuit 15 consisting of a thermistor resistor iih and a fixed resistor R is connected between the anode and the cathode of the PUT. A battery check circuit for a battery-powered ignition device, characterized in that: