JPS63220309A - Sensor stabilizing device - Google Patents

Abstract

PURPOSE:To stably supply heater voltage for a sensor and to stably extract a signal from the sensor by providing the titled device with a dummy load device having the same load as that of a real load device to control a load value always at the same value. CONSTITUTION:Since the dummy load device 3d corresponding to the real load device 3b is used, a signal is sent from a part (b) in a control circuit part 3f to a transistor (TR) 3e to drive the dummy load device 3d when the real load device 3b is stopped, and when the device 3b is operating, a signal is sent to stop the device 3d, so that power is consumed always at the same load in a part B on the secondary side of a power supply transformer 2. Since the part B on the secondary side of the transformer 2 is not varied against the part A on the secondary side of the transformer 2, i.e. a part supplying heater voltage to the sensor 1, a stable voltage can be supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sensor stabilizing device for keeping the heater voltage stable against load fluctuations in a configuration in which a sensor is constantly heated by a heater.

BACKGROUND OF THE INVENTION Conventionally, this type of sensor stabilizing device has had a configuration as shown in FIG. That is, the first power transformer 102 that supplies heater power for the sensor 10'1 and the load 103
It was composed of two power transformers, a second power transformer 104 that supplies power to the.

The operation of the detection device configured as described above will be explained below.

When power is being supplied, the two power transformers 102 and 104 are energized, and the sensor 101 is also operating. At this time, the variable load 103 is controlled 0N-OFF by the action of the sensor 101, and the excitation starting force is generated due to the variation of this load, and the primary side voltage of the power transformer 104 also changes, so that the primary side voltage of the power transformer 102 The side voltage is also affected and fluctuates slightly, but this has almost no effect on the secondary side, so the heater voltage of the sensor 1o1 remains constant, and the sensor 101 also works stably.

Problems to be Solved by the Invention This conventional configuration requires two power transformers: the first power transformer 102 for the sensor 101 and the power transformer 104 for the variable load 103.
The problem is that the number of parts increases, leading to an increase in cost.

The present invention solves these problems, and aims to provide a sensor stabilizing device that allows a sensor to work stably even with load fluctuations using one power transformer.

Means for Solving the Problems In order to achieve this object, the present invention provides a sensor equipped with a heater section, an actual load device whose stoppage is controlled by the sensor, and a pseudo load having the same load as the actual load device. a control circuit device that starts the pseudo load device when the real load device stops, a load stabilizing device incorporating the real load device, the pseudo load device, and the control circuit device; The sensor includes a stabilizing device and a power transformer that supplies power to the heater, and is configured to maintain the power supply voltage supplied to the heater section of the sensor at a steady state even when the actual load device stops. .

Effect With this configuration, even if the actual load device stops, the same load is supplied by the dummy load device and the load is always adjusted to be constant, so the sensor unit connected to the same transformer as the load stabilizer The voltage supplied to the heater will be kept constant.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2. As shown in the figure, the heater section of the gas sensor 1 is connected to section A on the secondary side of the power transformer 2, and the heater voltage is supplied to the gas sensor 1. It is connected to part B of the sensor 1, and the heater part of the sensor 1 is supplied with an energy source by the same transformer. In the load stabilizing device 3, power is supplied to a real load device 3b, a pseudo load device 3d, and a control circuit portion 3f through a rectifier circuit portion 3a. Also, the transistor 3 which performs switching of the actual load device 3b by the control circuit section 3f.
A transistor 3e for switching the pseudo load device 3d is connected to the transistor 3e.

The operation of the gas detection device of this embodiment configured as described above will be described below.

By using a pseudo load device 3d corresponding to the real load device 3b, when the real load device 3b is stopped, a signal is sent to the transistor 3e from the b section of the control circuit section 3f to drive the pseudo load device 3d, and the actual load device 3b is driven. When the load device 3b is in operation, it is stopped as opposed to the pseudo load device 3d, so that power is always consumed in the B section on the secondary side of the power transformer 2 with the same load. Therefore, since there is no fluctuation in the B part of the secondary side of the power transformer 2 compared to the part A of the secondary side of the power transformer 2 that supplies the heater voltage of the sensor 1, the stable This means that voltage can be supplied.

FIG. 2 shows the driving timing of the actual load device 3b and the pseudo load device 3d.

In other words, according to this embodiment, even if the actual load stops, the heater voltage is stably supplied to the sensor 1, so the heater temperature is kept constant, and the signal from the sensor 1 can be taken out in a stable manner. It is something that can be done.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, even if one power transformer is shared as the heater power source of the sensor and the power source of the actual load device, the same load as the actual load device can be used. By providing a load device and controlling the load value so that it is always the same, the heater voltage of the sensor can be stably supplied, and the signal from the sensor can be taken out in a stable manner, creating an excellent sensor stabilization device. be able to.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a gas detection device according to an embodiment of the present invention, FIG. 2 is a timing diagram for the load of the same circuit, and FIG. 3 is a circuit diagram of a conventional gas detection device. 1...Sensor, 2...Power transformer,
3...Load stabilizing device, 3b...Actual load device, 3d...Pseudo low load device, 3f...
・Control circuit device.

Claims (1)

[Claims] A sensor equipped with a heater, a real load device whose stoppage is controlled by the sensor, a pseudo load device with the same load as the real load device, and control for starting the pseudo load device when the real load device stops. a circuit device; a load stabilizing device incorporating the real load device, the pseudo load device, and the control circuit device; and a power transformer for supplying power to the load stabilizing device and the heater; A sensor stabilizing device that maintains the power supply voltage supplied to the sensor heater at a steady state even when the actual load device stops.