JP4951444B2 - Inspection device for light emitting circuit of fire detector and inspection method for light emitting circuit of fire detector - Google Patents

Description

The present invention relates to an inspection device for a light emitting circuit of a fire detector and a method for inspecting a light emitting circuit of a fire detector.

  In the conventional photoelectric smoke detector and smoke detector assembly, a light emitting element is mounted on a hybrid substrate via a lead fitting (see, for example, Patent Document 1).

  And when inspecting the photoelectric smoke detector or the smoke detector assembly, since the inspection is performed in a state where the light emitting element is mounted, if it is determined that the substrate is defective as a result of the inspection, The entire photoelectric smoke detector or the smoke detector assembly is discarded, even if the light emitting element itself is normal.

By the way, the fire detection operation of the smoke detector causes the light emitting element to emit light for several tens to several hundreds of microseconds every several seconds. In addition, when a light emitting element is caused to emit light, a large current needs to be flowed instantaneously, but in order to supply this current, electric charge is stored in a capacitor, and after light emission, the consumed electric charge is charged into the capacitor, Prepare for fire detection (light emission). Since the smoke detector performs fire monitoring by repeating the above operation, the light emitting circuit repeats charging and discharging.
Japanese Patent No. 3370032

  The simplest and most reliable way to check whether the light-emitting circuit is charging and discharging normally is to use a measuring instrument that can observe the waveform, such as an oscilloscope. . However, when inspecting a light emitting circuit on a board to be inspected of a fire detector used as a product, since the inspection time is long, there is a problem that an inspection using an oscilloscope is not appropriate when the inspection quantity is large. Further, since the oscilloscope itself is very expensive, there is a problem that the equipment cost becomes enormous if the inspection line is added.

  On the other hand, there is a method to inspect the light emitting circuit by introducing a dedicated inspection device for each model, but this method is restricted when the trigger signal and sampling timing specifications differ depending on the fire detector model. It is hard to say that it is versatile.

An object of the present invention is to provide a light-emitting circuit inspection apparatus and inspection method that are inexpensive and versatile.

The present invention includes a capacitor connected to a power source via a charging current limiting resistor, a light emitting element, a light emitting current limiting resistor for controlling a current flowing through the light emitting element, and a switch element for controlling on / off of a current flowing through the light emitting element; Is a light emitting circuit of a fire detector in which the capacitor and the series circuit are connected in parallel, and the light emitting circuit of the substrate to be inspected is not connected to the light emitting element. In the fire detector light emission circuit inspection apparatus, the fire detector light emission circuit inspection apparatus includes a simulated resistance unit and a voltage measurement unit, and the simulated resistance unit includes a resistance and the resistance. A first probe connected to one end of the resistor and a second probe connected to the other end of the resistor, the voltage measuring unit connected to the voltage measuring unit and one end of the voltage measuring unit A third probe connected to the other end of the voltage measuring unit, a first terminal in the light emitting circuit of the substrate to be inspected to which one end of the light emitting element is to be connected, and the light emitting element One of the probes of the simulated resistance unit is connected to the second terminal of the light emitting circuit of the board to be inspected to be connected to the other end, and one of the probes of the voltage measuring unit is connected to both ends of the capacitor, respectively. The difference or ratio between the on-time voltage value output by the voltage measurement unit when the switch element is connected and turned on, and the off-time voltage value output by the voltage measurement unit when the switch element is turned off. An inspection device for a light emitting circuit of a fire detector having a calculation means for calculating.

According to the present invention, an inspection device for a light emitting circuit of a fire detector can be manufactured at low cost, and the inspection device has versatility.

  The best mode for carrying out the invention is the following examples.

  FIG. 1 is a circuit diagram showing a part of a light-emitting circuit 100 of a sensor that is an object to be inspected by the light-emitting circuit inspection device 200 according to the first embodiment of the present invention.

  The light emitting circuit 100 of the sensor SE1 is a circuit to be inspected, and includes a power source B1, a charging current limiting resistor R1, a light emitting current limiting resistor R2, a light emitting element mounting unit 10, a switch element SW1 that controls light emission, And a light emitting capacitor C1.

  The power supply B1 supplies electric charges to the light emitting capacitor C1. The light emission current limiting resistor R2 is a resistor that limits the light emission current flowing from the capacitor C1 to the light emitting element. The switch element SW1 controls on / off of a current flowing through the light emitting element.

  The light emitting element mounting part 10 is a part for mounting a light emitting element (not shown), and has a first terminal T1 and a second terminal T2. The first terminal T1 is a land on the light emitting circuit to which the anode of the light emitting element is to be connected, and the second terminal T2 is a land on the light emitting circuit to which the cathode of the light emitting element is to be connected. The switch element SW1 may be a transistor, an FET, or the like.

  That is, in the light emitting circuit 100 of the sensor SE1, a capacitor is connected to the power supply via the charging current limiting resistor, and the light emitting current limiting resistor that controls the current flowing through the light emitting element and the light emitting element and the current flowing through the light emitting element are turned on. A series circuit in which switch elements for controlling OFF are connected in series, and the light emitting circuit of the fire detector SE1 in which the capacitor and the series circuit are connected in parallel, wherein the light emitting element is connected This is the light emitting circuit of the fire detector SE1 for inspecting the light emitting circuit of the board to be inspected that has not been performed.

  The example shown in FIG. 1 is an example of a light emitting circuit using the switch element SW1, but instead of doing so, a constant current circuit in which the switch element SW1 is a transistor and an emitter follower is formed together with the light emission current limiting resistor R2. May be provided.

  FIG. 2 is a circuit diagram showing a light emitting circuit inspection apparatus 200 according to the first embodiment of the present invention.

  The light emitting circuit inspection apparatus 200 includes a simulated resistance unit 50 including a simulated resistance R3, a first probe P1, and a second probe P2, a third probe P3, a fourth probe P4, and a voltage measuring unit 20. And a signal processing unit 30.

  For example, the first probe P1 and the second probe P2 are either the first terminal on the light emitting circuit to which one end of the light emitting element is connected or the second terminal on the light emitting circuit to which the other end of the light emitting element is connected. It is a probe connected to. In addition, for example, the third probe P3 and the fourth probe P4 are probes connected to either one of the ends of the capacitor C1.

  The simulated resistor R3 is a simulated resistor connected instead of the light emitting element, and is connected between the first probe P1 and the second probe P2. The voltage measuring unit 20 is connected between the third probe P3 and the fourth probe P4.

  The voltage measurement unit 20 measures the voltage across the capacitor C1.

  When the first to fourth probes P1 to P4 are connected to corresponding parts, the signal processing unit 30 turns on the switch element SW1 and the on-time voltage value output by the voltage measuring unit 20 when the switch element SW1 is turned on. It is an example of the calculating means which calculates | requires the difference or ratio with the voltage value at the time of OFF which the voltage measurement part 20 output immediately before turning off. The signal processing unit 30 determines that the capacitor C1 is short-circuited if the on-time voltage value or the difference or ratio value is greater than the first threshold value TH1, and the on-time voltage is determined. If the value or the value of the difference or ratio is a value between the first threshold value TH1 and the second threshold value TH2, it is determined that the capacitor C1 is normal, and the on-time voltage value, or This is an example of determination means for determining that the capacitor C1 is open if the value of the difference or ratio is smaller than the second threshold value TH2.

  FIG. 3 is a diagram illustrating a relationship between the sensor SE1 and the inspection apparatus 200.

  The sensor SE1 includes a CPU 40 and a light emitting circuit 100.

  The CPU 40 instructs the voltage measuring unit 20 provided in the inspection apparatus 200 to measure the voltage for each sampling, compares the difference or ratio calculated by the signal processing unit 30 with the first threshold value TH1, and The difference or ratio is compared with the second threshold value TH2.

  At the same time that the sensor SE1 receives a light emission control command from the outside of the sensor SE1, the CPU 40 transmits a control signal to the voltage measurement unit 20 to cause the voltage measurement unit 20 to start voltage measurement. The voltage measuring unit 20 measures the voltage across the capacitor C1 at a sampling interval corresponding to the control signal, and measures until a measurement end command is received. Note that the light emission control command to the sensor SE1 may be transmitted from the inspection apparatus 200.

  After a predetermined time has elapsed since the sensor SE1 received the light emission control command, the CPU 40 turns on the switch element SW1. Immediately before the start of light emission (immediately before the switch element SW1 is turned on) or after the end of light emission (after the switch element SW1 is turned off), the value of the data measured by the voltage measuring unit 20 and the value of the voltage across the capacitor C1 during light emission The quality of the capacitor C1 is determined by obtaining the difference or ratio. According to this method, the data collection time can be kept to the minimum necessary, and even when measuring a plurality of times, the inspection can be performed only by providing a minimum charging time. Further, if the time from the light emission control command to the sensor SE1 to the light emission is long, it can be dealt with by increasing the voltage measurement time.

  Next, the operation of the first embodiment will be described.

  FIG. 4 is a flowchart showing the operation of the above embodiment.

  In S <b> 1, the CPU 40 receives a light emission control command from the outside of the fire detector SE <b> 1, and at the same time, the signal processing unit 30 transmits a control signal to the voltage measurement unit 20. In S <b> 2, the CPU 40 causes the voltage measurement unit 20 to start voltage measurement. In S3, the switch element SW1 is turned on, and in S4, the switch element SW1 is turned off. In S5, the voltage measurement is finished after the lapse of the specified time. The number of times of measurement (n) may be one time or a plurality of times. In S6, the measurement data is transmitted to the signal processing unit 30, and in S7, the difference or ratio between the value of the first measurement data A0 and the value of the nth measurement data An is obtained and stored in the storage device. If the difference or ratio is greater than the threshold value TH1, it is determined in S8 that the capacitor C1 is abnormal such as a short circuit. If the difference or ratio is the threshold value TH1 to TH2, it is determined in S9 that the capacitor C1 is normal. If the difference or ratio is smaller than the threshold value TH2, it is determined in S10 that the capacitor C1 is abnormal such as opening.

  The abnormality determination between S8 and S10 is based on which step is the first measurement data A0 (for example, before S3 or between S3 and S4), or which step is the nth data An (for example, S3 and S3). Depending on whether it is during S4 or after S4.

  The threshold values TH1 and TH2 are stored in advance in the storage device.

  In the above embodiment, the light emitting circuit of the smoke detector SE1 can be inspected in a short time. Further, even if the substrate is discarded when the substrate is defective, it is not necessary to discard the expensive optical element.

  In other words, in the above embodiment, a capacitor is connected to the power supply via the charging current limiting resistor, and the light emitting current limiting resistor for controlling the current flowing through the light emitting element and the light emitting element and the on / off of the current flowing through the light emitting element are controlled. A series circuit in which a switch element is connected in series, wherein the capacitor and the series circuit are connected in parallel, and is a light emitting circuit of a fire detector, wherein the light emitting element is not connected In the light emission circuit inspection device for a fire detector for inspecting a light emission circuit on a board, the light emission circuit inspection device for the fire detector has a simulated resistance unit and a voltage measurement unit, and the simulated resistance unit is a resistance And a first probe connected to one end of the resistor, and a second probe connected to the other end of the resistor, the voltage measurement unit comprising: a voltage measurement unit; and the voltage measurement A first probe in the light emitting circuit of the substrate to be inspected, to which one end of the light emitting element is to be connected, and a third probe connected to one end of the light emitting element, and a fourth probe connected to the other end of the voltage measuring unit, One of the probes of the simulated resistance unit is connected to the second terminal of the light emitting circuit of the substrate to be inspected to which the other end of the light emitting element is connected, and one of the voltage measuring units is connected to both ends of the capacitor. Between the on-state voltage value output by the voltage measurement unit when the switch element is turned on and the off-state voltage value output by the voltage measurement unit when the switch element is turned off. It is an example of an inspection device for a light emitting circuit of a fire detector having calculation means for calculating a ratio.

  In this case, if the on-time voltage value or the value of the difference or ratio is equal to or greater than the first threshold value, it is determined that the capacitor is short-circuited, and the on-time voltage value or the difference or ratio is determined. If the value of the ratio is between the first threshold value and the second threshold value, it is determined that the capacitor is normal, and the on-time voltage value, or the value of the difference or ratio is the second value. If it is smaller than the threshold value, it has a judging means for judging that the capacitor is opened.

  In addition, the initial voltage value immediately before the switch element is turned on is measured, and then the on-time voltage value and the off-time voltage value when the switch element is repeatedly turned on and off are continuously measured. A difference or ratio between the on-time voltage value or the off-time voltage value and the initial voltage value is calculated, and the rate of change of the time-series data obtained by calculating the difference or ratio is the first threshold value and the Judgment means for judging that the capacitor is normal if it is within the range of the second threshold and for judging that the capacitor is abnormal if it is outside the range of the first threshold and the second threshold. Have

  Moreover, the said Example can be grasped | ascertained as invention of a method. In other words, in the above embodiment, a capacitor is connected to the power supply via the charging current limiting resistor, and the light emitting current limiting resistor for controlling the current flowing through the light emitting element and the light emitting element and the on / off of the current flowing through the light emitting element are controlled. A series circuit in which a switch element is connected in series, wherein the capacitor and the series circuit are connected in parallel, and is a light emitting circuit of a fire detector, wherein the light emitting element is not connected In an inspection device for a light emitting circuit of a fire detector for inspecting a light emitting circuit of a board, a first terminal in the light emitting circuit of the board to be inspected to which one end of the light emitting element should be connected and the other end of the light emitting element should be connected One of the probes of the simulated resistance unit is connected to the second terminal of the light emitting circuit of the substrate to be inspected, and the voltage measuring unit is connected to both ends of the capacitor. An on-state voltage value output by the voltage measurement unit when each of the probes is connected and the switch element is turned on, and an off-time voltage value output by the voltage measurement unit when the switch element is turned off It is an example of the test | inspection method of the light emission circuit of the fire detector which has the calculating process which calculates | requires the difference or ratio of these, and memorize | stores it in a memory | storage device.

  In this case, if the storage step of storing the first threshold value and the second threshold value in the storage device and the on-time voltage value or the value of the difference or ratio is greater than or equal to the first threshold value, the capacitor Is determined to be short-circuited, and the capacitor is determined to be normal if the on-time voltage value or the difference or ratio value is between the first threshold value and the second threshold value. A determination step of determining that the capacitor is open if the on-time voltage value or the difference or ratio value is smaller than the second threshold value.

In addition, the storage step of storing the first threshold value and the second threshold value in the storage device, the initial voltage value immediately before turning on the switch element is measured, and then the switch element is repeatedly turned on and off. The on-time voltage value and the off-time voltage value are measured continuously, and the difference or ratio between the on-time voltage value or the off-time voltage value and the initial voltage value is obtained and stored in the storage device. If the comparison step and the rate of change of the time-series data obtained by calculating the difference or ratio are within the range between the first threshold and the second threshold, it is determined that the capacitor is normal, and A method for inspecting a light-emitting circuit of a fire detector, comprising: a determination step of determining that a capacitor is abnormal if it is out of a range between a first threshold value and the second threshold value.

It is a circuit diagram which shows a part of light emission circuit 100 of sensor SE1 which is the object which the test | inspection apparatus 200 of the light emission circuit which is Example 1 of this invention inspects. It is a circuit diagram which shows the test | inspection apparatus 200 of a light emission circuit. It is a figure which shows the relationship between sensor SE1 and the test | inspection apparatus 200. FIG. It is a flowchart which shows operation | movement of the said Example 1. FIG. It is a figure which shows the example of the change of the time series data by the signal processing part 30 of the test | inspection apparatus 200 of the light emission circuit which is Example 2 of this invention.

Explanation of symbols

SE1 ... sensor SE1,
100: Light emitting circuit of the sensor SE1,
SW1 ... switch element,
C1 ... capacitor
10: Light emitting element mounting part,
200: Light-emitting circuit inspection device,
20: Voltage measuring unit,
30: Signal processing unit,
40 ... CPU,
50 ... Simulated resistance unit,
60: Voltage measurement unit.

Claims (2)

A capacitor is connected to the power supply via a charging current limiting resistor, and a light emitting element, a light emitting current limiting resistor that controls the current flowing through the light emitting element, and a switch element that controls on / off of the current flowing through the light emitting element are connected in series. A series circuit to be connected, which is a light emitting circuit of a fire detector in which the capacitor and the series circuit are connected in parallel. In the inspection device for the light emitting circuit of the fire detector,
The inspection device for the light emitting circuit of the fire detector has a simulated resistance unit and a voltage measurement unit,
The simulated resistance unit includes a resistor, a first probe connected to one end of the resistor, and a second probe connected to the other end of the resistor,
The voltage measurement unit includes a voltage measurement unit, a third probe connected to one end of the voltage measurement unit, and a fourth probe connected to the other end of the voltage measurement unit,
The simulated resistance unit is connected to a first terminal in the light emitting circuit of the substrate to be inspected to which one end of the light emitting element is connected and a second terminal in the light emitting circuit of the inspected substrate to which the other end of the light emitting element is to be connected. Each of the probes is connected, and one of the probes of the voltage measurement unit is connected to both ends of the capacitor, and the voltage measurement unit outputs an on-time voltage value when the switch element is turned on, An arithmetic means for calculating a difference or ratio with an off-time voltage value output by the voltage measurement unit when the switch element is turned off;
A device for inspecting a light emitting circuit of a fire detector, comprising:
A capacitor is connected to the power supply via a charging current limiting resistor, and a light emitting element, a light emitting current limiting resistor that controls the current flowing through the light emitting element, and a switch element that controls on / off of the current flowing through the light emitting element are connected in series. A series circuit to be connected, which is a light emitting circuit of a fire detector in which the capacitor and the series circuit are connected in parallel, and the light emitting circuit of the board to be inspected to which the light emitting element is not connected is inspected. In the inspection method of the light emitting circuit of the fire detector,
The simulated resistance unit is connected to a first terminal of the light emitting circuit of the substrate to be inspected to which one end of the light emitting element is connected and a second terminal of the light emitting circuit of the to-be-inspected substrate to which the other end of the light emitting element is to be connected. One of the probes is connected, and one of the probes of the voltage measurement unit is connected to both ends of the capacitor, and the on-time voltage value output by the voltage measurement unit when the switch element is turned on, A method for inspecting a light-emitting circuit of a fire detector, comprising: calculating a difference or ratio with an off-time voltage value output from the voltage measuring unit when the switch element is turned off, and storing the difference or ratio in a storage device.

Images