TWM462838U - Electronic ignition control device of gas water heater - Google Patents

Description

Gas water heater electronic ignition controller

This creation relates to an electronic ignition controller, and more particularly to an electronic control device for operating a gas water heater.

The conventional gas water heater will automatically turn off the power and gas after the hot water tap is turned on, such as not igniting within 60 seconds, or the water heater is continuously used for about 20 minutes to ensure safety. To continue using it, you must turn it off and then on again to restart the water heater.

The above safety mechanism is operated by the microprocessor output voltage of the electronic ignition controller to supply the power supply control circuit, and then the voltage is supplied from the power supply control circuit to the ignition circuit, the differential pressure valve control circuit and the flame signal sensing circuit to generate high voltage current respectively. The spark occurs, the normally closed electromagnetic valve is opened to release a small amount of gas for the spark to ignite into the mother fire and remain in the flame signal sensing state, and the microprocessor performs the safe ignition timing. When the mother fire is lit and the flame signal sensing circuit senses the flame signal, the ignition circuit stops generating high voltage current, and the differential pressure valve control circuit closes the normally open solenoid valve to open the main valve and release a large amount of gas for the above-mentioned mother fire. The main fire is burned, and the microprocessor cancels the timing of the safe time and starts timing the time of the burn. When the safe ignition timing or the timing combustion time expires, the microprocessor stops outputting the voltage to the power supply control circuit, thereby cutting off the voltages of the ignition circuit, the differential pressure valve control circuit, and the flame signal sensing circuit to stop the predetermined action.

Since the power control circuit of the conventional electronic ignition controller is from a small place The processor obtains a voltage and operates, and supplies voltage to the ignition circuit, the differential pressure valve control circuit, and the flame signal sensing circuit to perform the predetermined functions. Therefore, once the microprocessor is damaged, the entire electronic ignition controller loses its effect. At this time, even if the power supply control circuit, the ignition circuit, the differential pressure valve control circuit, and the flame signal sensing circuit are still intact, the water heater cannot be operated continuously.

The present invention has been made to solve the above problems, and its object is to provide an improved electronic ignition controller that can operate normally at the expense of safe ignition time and timed combustion time when the microprocessor is damaged.

The electronic ignition controller specifically implementing the present invention comprises a microprocessor and peripheral circuit for performing a timing function including a safe ignition time and a timing combustion time; a power boost circuit for raising the voltage of a battery to The operating voltage required by the microprocessor; an ignition circuit for generating a high voltage flow required to generate a spark to ignite the gas to form a flame; and a differential pressure valve control circuit for controlling the normally closed solenoid valve on a differential pressure valve And a normally open electromagnetic valve opening and closing; a flame signal sensing circuit for sensing the signal of the flame feedback; and a power control circuit for supplying and cutting the ignition circuit, the differential pressure valve control circuit and the flame signal sensing circuit a voltage; wherein the power control circuit operates to obtain a voltage via a water pan switch when the water heater is activated to supply a voltage to the ignition circuit, the differential pressure valve control circuit, and the flame signal sensing circuit to perform the predetermined Function of the microprocessor to output a reverse voltage when the safe ignition time or the timing combustion time expires Stop, so that the high voltage ignition circuit, the control circuit and the differential pressure valve fire signal sensing circuit stops operating.

The reverse voltage output by the microprocessor is via a diode or The transistor is delivered to the power control circuit.

The electronic ignition controller further includes a weak indication circuit, and the microprocessor outputs a voltage for lighting an LED when the weak indication circuit senses that the battery voltage is lower than a preset voltage.

The advantage of this creation is that, through the reverse control mode, the power control circuit directly obtains the voltage from the water tray switch when the water heater is started, and supplies the voltage to the ignition circuit, the differential pressure valve control circuit and the flame signal sensing circuit to make it The predetermined function is respectively executed; when the safe ignition time or the timing burning time of the timing performed by the microprocessor is reached, the output reverse voltage turns off the power control circuit to cut off the ignition circuit, the differential pressure valve control circuit and the flame signal induction. The voltage of the circuit. Therefore, even if the microprocessor is damaged, the water heater can continue to work under the premise of only losing the safe ignition time and the timing burning time function, so as not to completely lose its effect, so that in some cases, such as late night or a moment, no professional can be found. When overhauling or renewing, you can temporarily solve the urgent need.

The detailed technical contents and other objects and features of the present invention can be fully understood by referring to the following description of embodiments with reference to the accompanying drawings.

10‧‧‧Electronic ignition controller

12‧‧‧Microprocessor and peripheral circuits

14‧‧‧Power boost circuit

16‧‧‧Ignition circuit

18‧‧‧ Differential valve control circuit

20‧‧‧Flame signal sensing circuit

22‧‧‧Power Control Circuit

24‧‧‧Weak electricity indication circuit

Figure 1 is a detailed circuit diagram of a preferred embodiment of the present invention.

FIG. 1 is a detailed circuit of a preferred embodiment of the electronic gas ignition controller 10 for creating a gas water heater for explaining the technical content of the present creation. The electronic ignition controller 10 is composed of a microprocessor and peripheral circuit 12, a power supply boosting circuit 14, an ignition circuit 16, a differential pressure valve control circuit 18, a flame signal sensing circuit 20, and a power supply control. The circuit 22 and the weak indication circuit 24 are logically composed according to a certain line to achieve the purpose of operating the water heater. Wherein: the microprocessor and the peripheral circuit 12 are composed of the microprocessor U1 and its peripheral electronic components R13~16, R24 and C7~C8, and the program is stored in the memory of the microprocessor U1 in a program logic manner. Achieve a predetermined function, including 60 seconds of safe ignition time and 20 minutes of timing combustion time, when a time is up, a reverse voltage is output to turn off the power control circuit 20 to turn off the ignition circuit 16, the differential pressure valve control circuit 18 and flame signal sensing circuit 20.

The power boosting circuit 14 includes an integrated circuit U2, a voltage stabilizing diode D7, capacitors C4 to C6, and an inductor L1 to stably raise the voltage supplied from the battery to the operating voltage required by the microprocessor U1.

The ignition circuit 16 includes a transistor Q3, a boosting coil T2, an ignition coil T3, a diode D1, a D4, a capacitor C3 and a resistor R6 for generating a high voltage current required for ignition, and the high voltage current is transmitted through the conductive line (Fig. Not shown) is output to an ignition electrode (not shown) where a spark is generated to ignite a mixture of gas and air to form a parent flame.

The valve control circuit 18 includes transistors Q5~Q7, diodes D5 and D6 and resistors R8~R11, wherein Q5 and Q6 respectively serve as normally closed solenoid valves and normally open solenoid valves on the differential pressure valve (not shown). The switch is used; Q7 is used as the switch for Q3 and Q6 above. The normally closed solenoid valve is connected to the contact point TP6, and the normally open solenoid valve is connected to the contact point TP7.

The flame signal sensing circuit 20 mainly includes a transistor Q1, Q2, an induction coil T1, a synchronizing diode ZD1, capacitors C1 and C1, and resistors R2 to R5 to perform a flame signal sensing function.

The power control circuit 22 includes a transistor Q4, diodes D2, D3, and a resistor R7. The power supply control circuit 22 supplies a voltage to the ignition circuit 16, the differential pressure valve control circuit 18, and the flame signal sensing circuit 20 to operate in the Q4 ON state; otherwise, when Q4 is turned off, the voltage of the circuit is turned off to stop. action. D2 can also be replaced by a transistor.

The weak current indicating circuit 22 is composed of a transistor Q9 and resistors R17 to R18. When the battery voltage is higher than the preset voltage, Q9 acts, and pin 1 of U1 has no output; otherwise, when the battery voltage is lower than the preset voltage, Q9 does not operate, and U1 outputs a voltage from pin 1 to contact LA2 to make the connection. The LEDs (not shown) to the contacts LA1 and LA2 illuminate to give the user a visual warning signal to remind them to replace the battery.

Then explain how this creation works. When the hot water tap is turned on, the cold water flows through the water tray to act, thereby opening the first valve of the gas passage, and simultaneously touching the water tray switch (usually a micro switch), at which point the contact TP5 input is Low, and Q4 is obtained from R7. The biasing acts to supply a voltage to the ignition circuit 16, the differential pressure valve control circuit 18 and the flame signal sensing circuit 20 to perform a predetermined function, that is, the ignition circuit 16 generates a high voltage current; the differential pressure valve control circuit 18 via the R8 Supply Q5 bias action, open the normally closed solenoid valve, release a small amount of gas for the spark generated by the high-voltage current discharge to ignite into a mother fire; the flame signal sensing circuit 20 senses the flame signal from the contact S to make Q2 move, and Q7 from Q2 Obtaining the biasing action, according to which D3 turns off Q3, so that the ignition circuit 16 stops the ignition, and on the other hand, the bias voltage is applied to the Q6 through the R10 to close the normally open electromagnetic valve, so that the main valve on the differential pressure valve is The pressure difference acts to open, releasing a large amount of gas for the above-mentioned mother fire to ignite into the main fire, and simultaneously transmitting a signal to the microprocessor U1 to cancel the timing of the safe ignition time and start continuous combustion. Timing.

When the microprocessor U1 is at a safe ignition time or a timing burning time, a reverse voltage is outputted, and Q4 is turned off by D2 to cut off the voltages of the ignition circuit 16, the differential pressure valve control circuit 18, and the flame signal sensing circuit 20. Let it stop the established action and ensure safety.

Of course, the above embodiments may be modified without departing from the scope of the present invention, and all the matters included in the above description and the drawings should be regarded as illustrative, and not intended to limit the scope of patent application of the present invention. .

10‧‧‧Electronic ignition controller

12‧‧‧Microprocessor and peripheral circuits

14‧‧‧Power boost circuit

16‧‧‧Ignition circuit

18‧‧‧ Differential valve control circuit

20‧‧‧Flame signal sensing circuit

22‧‧‧Power Control Circuit

24‧‧‧Weak electricity indication circuit

Claims (4)

A gas water heater electronic ignition controller comprises: a microprocessor and peripheral circuit for performing a timing function including a safe ignition time and a timing combustion time; and a power supply boost circuit for raising a battery voltage to The operating voltage required by the microprocessor; an ignition circuit for generating a high voltage flow required to generate a spark to ignite the gas to form a flame; and a differential pressure valve control circuit for controlling the normally closed solenoid valve on a differential pressure valve And a normally open electromagnetic valve opening and closing; a flame signal sensing circuit for sensing the signal of the flame feedback; and a power control circuit for supplying and cutting the ignition circuit, the differential pressure valve control circuit and the flame signal sensing circuit The voltage control circuit is configured to obtain a voltage via a water pan switch when a hot water tap is opened to supply a voltage to the ignition circuit, the differential pressure valve control circuit and the flame signal sensing circuit. Performing a predetermined function separately; the microprocessor outputs a reverse voltage when the safe ignition time or the timing combustion time expires Circuit is turned off, the high voltage ignition circuit, the control circuit and the differential pressure valve fire signal sensing circuit stops operating. The gas water heater electronic ignition controller of claim 1, wherein the reverse voltage output by the microprocessor is transmitted to the power control circuit via a diode. The gas water heater electronic ignition controller of claim 1, wherein the reverse voltage output by the microprocessor is transmitted to the power supply control circuit via a transistor. The gas water heater electronic ignition controller according to claim 1, which further comprises a The weak current indicating circuit outputs a voltage for lighting an LED when the weak electric indicating circuit senses that the battery voltage is lower than a preset voltage.