JP4756412B2 - Package judgment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a package determination method, and more particularly to a technique for determining the type of a package inserted with an extremely simple circuit configuration.
[0002]
[Prior art]
There is a configuration of an electric device in which a plurality of sub-boards (hereinafter referred to as insertion packages) are connected to one main board (hereinafter referred to as a control package) to function.
For example, it is assumed that the above-described control package performs overall control of the entire electrical device, and that there are various types of insertion packages depending on functions, and that their mounting locations are not completely fixed.
In an electric device having such a configuration, the control package may need to know what insertion package is connected and how many.
In such a case, in the conventional package determination method, for example, by performing data communication between the control package and the insertion package, the control package is in a state (type and quantity) of the connected insertion package. I knew.
[0003]
[Problems to be solved by the invention]
However, the conventional package determination method described above has a problem that a communication circuit for data communication is required for both the control package and the insertion package, resulting in a complicated configuration.
[0004]
The present invention has been made to solve such a problem, and an object thereof is to provide a package determination method capable of determining the type of an inserted package with a simple circuit configuration.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 of the package determination method according to the present invention is a package determination method in which the type of the inserted package inserted in the live line state is determined by the control package, The insertion package includes a capacitor having one end connected to a low potential point and a diode having a cathode connected to the other end of the capacitor, and the control package includes a resistor having one end connected to a high potential point, A measurement circuit connected to the other end, and when the insertion package is inserted, the other end of the resistance of the control package and the anode of the insertion package are connected via an insertion signal line. The type of the inserted package is determined by measuring the voltage change of the signal line by the measurement circuit.
According to a second aspect of the present invention, in the package determination method according to the first aspect of the present invention, the measurement circuit includes a voltage monitoring unit that monitors the voltage of the insertion signal line, and a predetermined value. A clock generation unit that generates a clock frequency, a counting unit that counts clocks from the clock generation unit based on an output from the voltage monitoring unit, a storage unit that stores a preset count table, and the counting unit And a determination unit that determines the type of the package connected to the insertion signal line by comparing the output of the unit with a count table of the storage unit.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
FIG. 1 is a functional block diagram showing an embodiment of a package determination circuit using a package determination system according to the present invention.
[0007]
The package determination circuit shown in this example includes a back wiring board (hereinafter referred to as BWB) 2 having an insertion signal line 1 printed and wired with a plurality of junction points (connectors) 3 in place, and the insertion through the junction points 3. A control package (main substrate) 4 connected to the signal line 1 and a plurality of insertion packages (sub-substrates) 5 a to 5 c connected to the insertion signal line 1 through the junction 3 are configured.
Here, it is assumed that the insertion packages 5a, 5b, and 5c have different functions (types).
[0008]
The control package 4 includes a resistor R and a measurement circuit 6. One end of the resistor R is connected to the power supply voltage Vcc (high potential point) in the control package 4, and the other end of the resistor R is the control package. 4 is connected to the junction point.
The measurement circuit 6 includes a voltage monitoring unit 7, a clock generation unit 8, a counting unit 9, a determination unit 10, and a memory (storage unit) 11. The voltage monitoring unit 7 Is connected to the resistor R (the junction point side of the control package 4).
The voltage monitoring unit 7 monitors the voltage of the insertion signal line 1 and measures the voltage change state. The clock generator 8 generates a predetermined frequency by a local oscillator (not shown) and outputs this as a clock signal. Here, description will be made assuming a case where a 10 kHz clock is used.
The counting unit 9 counts the clock signal from the clock generation unit 8 based on the output of the voltage monitoring unit 7, and the count value is supplied to the determination unit 10.
The memory 11 stores information corresponding to the type of the inserted package in advance, and the stored information is referred to as a count table here.
The determination unit 10 determines what type of the inserted package is based on the count value from the counting unit 9 based on a count table stored in advance in the memory 11.
[0009]
Each of the insertion packages 5a to 5c includes a capacitor C and a diode D, and the connection configuration is the same, but the capacitance value of the capacitor C is set to a predetermined value according to the function (type) of the insertion package. To do. That is, taking the insertion package 5a as an example, one end of the capacitor C1 is connected to the ground (low potential point), and the other end is connected to the cathode side of the diode D1. The anode side of the diode D1 is connected to the junction point of the insertion package 5a.
In the example shown in FIG. 1, the insertion packages 5a and 5b have already been inserted, and the insertion package 5c shows a state to be inserted.
[0010]
The package determination circuit shown in this figure functions as follows. That is, since the insertion signal line 1 is connected to the power supply voltage Vcc via the resistor R in the control package 4, the voltage of the insertion signal line 1 becomes Vcc. In this state, for example, when the insertion package 5c is inserted, a current flows from the insertion signal line 1 to the ground via the diode D3 and the capacitor C3, whereby the voltage of the insertion signal line 1 decreases. That is, a CR circuit is formed between Vcc of the control package 4 and the ground of the insertion package 5c, and charging to C3 is performed according to the time constants of the resistor R and the capacitor C3. The voltage of the insertion signal line 1 at the time of charging is recovered to approach the Vcc voltage with time.
The voltage of the insertion signal line 1 that changes in this way is measured by the measurement circuit 6 of the control package 4.
[0011]
FIG. 2 is a diagram illustrating an example of a voltage change state of the insertion signal line. This figure shows voltage (V) on the vertical axis and time (t) on the horizontal axis, where “Vcc” is the power supply voltage, “Vr” is the reference voltage, and “t1”. Is the recovery time and “tp” is the protection time.
That is, when any type of insertion package is inserted into the insertion signal line 1 that is at the Vcc voltage, the voltage of the insertion signal line 1 decreases. In general, chattering occurs when a package is inserted, and this is also illustrated.
Thereafter, the voltage of the insertion signal line 1 gradually recovers toward the saturation of charging of the capacitor C. The measurement circuit 6 measures the recovery time indicated by t1, which passes through the reference voltage Vr from the first fall (within the protection time tp) that passes through the reference voltage Vr. Until the first rise (outside the protection time tp).
[0012]
The operation of the measurement circuit 6 will be described. First, the reference voltage Vr and the protection time tp are set in the voltage monitoring unit 7. When the voltage monitoring unit 7 captures the first falling edge that passes through the reference voltage Vr, the counting unit 9 starts measurement. A trigger signal to that effect is output. The measuring unit 9 that receives this starts counting based on the clock from the clock generating unit 8.
At this time, the voltage monitoring unit 7 prevents malfunction due to the influence of chattering by ignoring the passage of the reference voltage Vr during the protection time tp. Here, the protection time tp is 100 ms.
[0013]
Then, when the voltage monitoring unit 7 catches the first rising edge that passes the reference voltage Vr after the lapse of the protection time tp, the voltage monitoring unit 7 outputs a trigger signal indicating that the measurement is stopped to the counting unit 9. Based on the trigger signal indicating the stop of measurement, the counting unit 9 stops counting and outputs the count value to the determination unit 10. This count value corresponds to the return time t1, and the determination unit 10 determines which package has been inserted by checking the count value against the count table stored in the memory 11.
[0014]
FIG. 3 is a diagram illustrating an example of the count table stored in the memory 11. The count table shown in this figure is obtained by associating a counter value divided by an appropriate width with a predetermined package type. Here, the capacitances of the capacitors C1, C2, and C3 are 120 μF, 200 μF, and Take 300 μF as an example. In this case, the return time t1 of C1 is about 145.6 mS, the return time t1 of C2 is about 242.7 mS, and the return time t1 of C3 is about 364.1 mS.
The return time t1 can be obtained by the following equation (1).
[0015]
t1 = −CRlog (1- (Vr / Vcc)) (1)
[0016]
The count table associated in this way is stored in advance in the memory 11, and the determination unit 10 compares the counter value from the counting unit 9 with this count table to determine which insertion package it is. judge. For example, if the counter value from the counting unit 9 is “3200”, the determination unit 10 determines that the insertion package 5c including the capacitor C3 has been inserted, and as a result, the control package 4 has any type. It is possible to grasp that the package has been inserted.
Further, the control package 4 can grasp how many types of packages are inserted if the quantity is counted each time the packages are inserted.
[0017]
As described above, the package determination circuit using the package determination method according to the present invention varies the capacitance of the capacitor C installed in each insertion package according to the type of the insertion package, and is used in common by each insertion package. Since the return time t1 in the insertion signal line 1 is measured by the measurement circuit 6 of the control package 4 to determine the type of the insertion package, the circuit configuration can be simplified.
[0018]
The function of the diode D will be described with reference to the drawings.
FIG. 4 is a diagram showing a current flow of a newly inserted package. When the control package 4 and the insertion package 5b are already connected to the insertion signal line 1, the insertion package 5c is newly inserted. This is an example of the state immediately after.
That is, before the insertion package 5c is inserted, C2 of the insertion package 5b is charged. If there is no D2 of the insertion package 5b, C2 is charged when the insertion package 5c is inserted. Therefore, the measurement circuit 6 of the control package 4 becomes difficult to accurately measure the return time t1. Therefore, a diode D is inserted in each insertion package so that a discharge current does not flow out to the insertion signal line 1.
[0019]
【The invention's effect】
As described above, in the package determination method according to the present invention, the resistance R having a time constant related to the return time of the voltage of the inserted signal line is provided on the main board (control package) having the measurement circuit for measuring the voltage change of the inserted signal line. The sub-board (insertion package) is provided with a capacitor C having a time constant related to the return time of the voltage of the insertion signal line according to the type of the sub-board (insertion package), and is in an operating state (live line state). Since the type of the inserted package connected to the control package via the insertion signal line is determined by measuring the return time every time the package is inserted, the circuit configuration is complicated. It is possible to realize a package determination method that can determine a package without any problems.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing a configuration example of a package determination circuit using a package determination method according to the present invention.
FIG. 2 is a diagram illustrating an example of a voltage change state of an insertion signal line.
FIG. 3 is a diagram illustrating an example of a count table.
FIG. 4 is a diagram for explaining the function of a diode D;
[Explanation of symbols]
1 ... Insertion signal line 2 ... BWB (back wiring board)
3. Joint point (connector)
4. Control package (main board)
5a to 5c: Insertion package (sub-board)
6 ... Measuring circuit 7 ... Voltage monitoring unit 8 ... Clock generation unit 9 ... Counting unit 10 ... Determination unit 11 ... Storage unit (memory)

Claims (2)

A package determination method for determining a type of an insertion package to be inserted in a live line state using a control package,
The insertion package has a capacitor having one end connected to a low potential point and a diode having a cathode connected to the other end of the capacitor,
The control package includes a resistor having one end connected to a high potential point and a measurement circuit connected to the other end of the resistor,
When the insertion package is inserted, the other end of the resistance of the control package and the anode of the insertion package are connected via an insertion signal line,
A package determination method characterized by determining a type of an insertion package by measuring a voltage change of the insertion signal line at this time by the measurement circuit. The measurement circuit counts a clock from the clock generation unit based on an output from the voltage monitoring unit that monitors the voltage of the insertion signal line, a clock generation unit that generates a predetermined clock frequency, and the voltage monitoring unit. A determination unit that determines a type of a package connected to the insertion signal line by comparing a counting unit, a storage unit that stores a preset count table, and an output of the counting unit against a count table of the storage unit The package determination method according to claim 1, further comprising: a unit.

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