JPH025251Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion control device for a burner used in an instantaneous water heater or the like.

In recent years, various types of operating devices for combustion control units such as instantaneous water heaters have replaced the conventional on/off lock-type switches with non-locking switches such as push-on switches or touch switches due to the design and operability of the operating units. The control signal output section of the control circuit is inverted by operating the operating device, and the load is controlled by the inverted output.

However, with this type of control method, if the capacity setting state of the control circuit becomes unstable when the operation switch is turned off, or if the capacity setting is changed by mistake when turning off the operation switch, it is often necessary to reuse the control circuit. At the time, it was not necessary to change the ability settings, so it was necessary to reset the settings to the previous settings again, resulting in poor operability.

The present invention is intended to solve the problems of the prior art, and will be specifically explained below based on an embodiment shown in the drawings.

1 and 2 are an operation switch and a capacity setting device using push-on type switches, 3 is a power terminal, and 4 is a power supply terminal.
and 5 are output terminals to the load control circuit 6, a signal indicating the capacity level is supplied from the terminal 4, and a power supply is supplied from the terminal 5. Reference numeral 7 denotes a Zener diode connected in series with a resistor to the power supply line, which makes the voltage supplied to the control circuit A constant. Reference numerals 8 and 9 indicate inverting circuits provided in the control circuit A, and each inverting circuit is constituted by a T-type flip-flop in which the JK terminal of the JK flip-flop is connected to a power supply. The input terminal CP of the inverting circuit 8 is connected to the midpoint between the resistor 10 and the operation switch 1 via the Schmitt circuit 11, and the output terminal Q is connected to the transistor 13 interposed in the power supply line leading to the output terminal 5 via the inverter 12. It is connected to the base of In addition, the input terminal CP of the inverting circuit 9 is connected to the resistor 1.
4 and the center of the capacity setting device 2 and the Schmitt circuit 15
The output terminal Q is connected to the output terminal 4 via an inverter 16. 17 is a lamp that displays capacity small; lamp 17 is inverter 1
A lamp 18 indicating high capacity is connected to the output side of the inverter 16 via an inverter 19 and a diode 20. 21 is a drive circuit for the transistor 22, and the transistor 13
Resistor 23 and capacitor 2 are connected to the power supply line on the output side of
4 is connected, and the midpoint between the resistor 23 and the capacitor 24 is connected to the base of the transistor 22. 2
5 is a transistor whose emitter is connected to the power supply line of the control circuit A, its collector is connected to the J terminal and K terminal of the inverting circuit 9, and its base is connected to the collector of the transistor 22;
The transistors 22 and 25 and the inversion circuit 9 constitute a holding means.

In the above configuration, when the operation switch 1 is turned on, a high value signal is input to the input terminal CP of the inverting circuit 8, and the output of the output terminal Q is inverted. Therefore, each time the operation switch 1 is turned on, the transistor 13 is turned on and off. The state is controlled alternately, and combustion is controlled to turn on and off. When the capacity setting device 2 is also turned on, the output of the inverting circuit 9 is inverted, and the output of the inverter 16 is also inverted, so every time the setting device 2 is turned on, the output of the inverter 16 is alternately inverted to a high value and a low value. Signals indicating high and low capacities are alternately outputted from the output terminal 4 to control the level of capacity.

Next, the holding means will be explained. When combustion is turned on by the operation switch 1, the transistor 13 becomes conductive as described above, so that a drive current flows from the drive circuit 21 to the base of the transistor 22, and the transistor 22 becomes conductive. When the transistor 22 is conductive, the transistor 25 is also conductive, and the J and K terminals of the inverting circuit 9 are connected to the power supply line of the control circuit A. Therefore, when the transistor 13 is conductive, that is, when the operation switch 1 is turned on, The inverting circuit 9 becomes a T-type flip-flop, and the capacity can be set as described above. However, when the transistor 13 is cut off, that is, when the operation switch 1 is turned off, no drive current flows to the base of the transistor 22, and the transistor 25 is cut off. Therefore, a low value signal is input to the J terminal and K terminal of the inverting circuit 9. Therefore, even if a high value signal is input to the input terminal CP, the output from the output terminal Q does not change, and therefore, the output state of the inverting circuit 9 is maintained at the state before the cutoff at the same time as the transistor 13 is cut off. become.

Therefore, when the operation switch 1 is turned on again to use the appliance, the combustion capacity is maintained at the state before stopping, so there is no need to operate the capacity setting device again.

As explained above, according to the present invention, even if the use is stopped once, there is no need to reset the capacity setting to the state before use when reusing it, so the ease of use of water heaters etc. can be significantly improved. This is an extremely practical idea.

[Brief explanation of the drawing]

The drawing is an electrical circuit diagram showing an embodiment of the present invention. 1... Operation switch, 2... Capacity setting device, A...
...control circuit.

Claims (1)

[Scope of utility model registration request] A control circuit that is equipped with an operation switch that turns combustion on and off, a non-locking capacity setting device that varies the capacity, and a control circuit that outputs a predetermined control signal based on the operation signals of the operation switch and capacity setting device. A combustion control device characterized in that a circuit is provided with means that is activated by an off operation of the operation switch to maintain the capacity setting in the state before the off operation.