JPH10136033A - Two-signal simultaneous transmission method/device and current voltage detection device using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce necessary signal lines to a half by expressing one signal component in two kinds of signals, with the pulse width of a high pulse on one digital signal line and expressing the other signal component with the pulse width of a low pulse on one identical digital signal line. SOLUTION: On the digital signal line 3, data being the signal component of a signal A is expressed by the inverses 1/t1 and 1/t3 of the pulse widths t1 and t3 of the respective high pulses, and a signal t2 is set to be the pause for signals t1 and t3 . In a signal B, data of the signal component is expressed by the inverses 1/t2 and 1/t4 of the pulse widths t2 and t4 of the respective low pulses, and the signal t3 is set to be the pause of the signals t2 and t4 . Thus, one signal becomes the pause for the other signal, and two kinds of signals by the high pulse and the low pulse are sent to a single signal line 3. Two kinds of signals are received in a reception means 2, and they are divided into a high pulse signal and a low pulse signal so as to be decoded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to two kinds of signals.
The present invention relates to a method and apparatus for transmitting two signals simultaneously on a digital signal line, and a current / voltage detecting apparatus using the apparatus.

[0002]

2. Description of the Related Art As shown in FIG. 5, in a conventional digital signal communication, when a frequency is used as a signal component, one signal line is used for each signal. That is, in FIG. 5, when two types of signals A and B are transmitted, two signal lines are conventionally used. In each signal line, 1 / t ₁ , 1 / t ₂ ... Are data,
t ₀ is a fixed time, and plays a role only to separate t ₁ and t ₂ . Accordingly, as shown in FIG. 6, conventionally, when two types of analog signals A and B are converted into digital signals and transmitted, two A / D converters are used to A / D convert each signal. A / D converter was required.

[0003]

However, in the above-described signal transmission method, when transmitting various types of signals, the same number of signal lines are required, and many types of analog signals are converted into digital signals. When converting and transmitting, the same number of A / D converters were required.

Therefore, the present invention can transmit two types of signals on one signal line, thereby halving the number of signal lines, and converting two types of analog signals into one A / D signal. An object of the present invention is to provide a two-signal simultaneous transmission method capable of performing conversion by a converter and transmitting the signal on one signal line, a device thereof, and a device using the device.

[0005]

In order to solve the above-mentioned problems, a two-signal simultaneous transmission method according to the present invention employs a pulse width of a high pulse on one digital signal line by converting one of two types of signals into one signal component. And the other signal component is the same 1
The first characteristic is that two types of signals are mixed and transmitted over time by one digital signal line by expressing the pulse width of a low pulse on the digital signal lines. In addition, the two-signal simultaneous transmission method of the present invention, in addition to the first feature, alternately switches between two types of analog signals and sends them to one comparator via one integration circuit. Converting one of the two types of analog signals into a high-pulse digital signal having a pulse width as a signal component, and converting the other analog signal into a low-pulse digital signal having a pulse width as a signal component; The second feature is that this is mixed and output over time on one output line from the comparator. Further, the two-signal simultaneous transmitting apparatus of the present invention converts a pair of input lines for inputting two types of analog signals and a pair of analog signals input through the pair of input lines into one rising wave and the other One integration circuit for integrating so as to become a triangular wave signal that becomes a falling wave, and an input line for switching the pair of input lines by integrating values obtained by the integration circuit become predetermined maximum and minimum values, respectively. A switching means for inputting a triangular wave signal output from the integration circuit, converting a rising wave of the triangular wave signal into a high-pulse digital signal having a pulse width of a pulse width, and a falling wave having a pulse width of a falling pulse; A third feature is to have one comparator that converts the digital signal into a low-pulse digital signal and outputs both digital signals with time. It is set to. Further, the drive voltage and drive current detection device of the fan motor of the present invention,
Using the two-signal simultaneous transmission device described as the third feature, an analog driving voltage detection line for the fan motor is connected to one of a pair of input lines of the two-signal simultaneous transmission device, and the other is an analog signal for the fan motor. By connecting the drive current detection line, the drive voltage and the drive current of the fan motor are output to one output line from the comparator with the pulse width of the high pulse digital signal and the pulse width of the low pulse digital signal output over time. The fourth feature is that the pulse width is detected.

In the two-signal simultaneous transmission method according to the first feature, one of the two types of signals is transmitted as a high pulse of one digital signal line, and the signal component is represented by the pulse width of the high pulse. The other signal is transmitted as a low pulse of the same digital signal line, and its signal component is represented by the pulse width of the low pulse. According to the method of the first aspect, two types of digital signals can be transmitted by one signal line, and the number of necessary signal lines can be reduced by half. In the two-signal simultaneous transmission method according to the second feature, in addition to the method according to the first feature, two types of analog signals are alternately sent to one integrator and one comparator, whereby Are converted into a high-pulse digital signal and a low-pulse digital signal having a pulse width as a signal component, and are transmitted through one digital signal line. According to the method according to the second aspect, the two types of analog signals are converted into digital signals using one A / D converter, and
It can be transmitted over a digital signal line. Therefore, in addition to halving the number of signal lines, the number of A / D converters can be halved. In the two-signal simultaneous transmission device according to the third aspect, two types of analog signals are alternately sent to the integration circuit by the input line switching means, and one of the two types of analog signals rises in the integration circuit. It is converted into a triangular wave that becomes a wave and the other becomes a falling wave and is output. In this case, the signal component of each analog signal is expressed as the wave width (or slope) of the rising wave and the wave width (or slope) of the falling wave. The triangular wave is further sent to a comparator, so that the rising wave of the triangular wave becomes a digital signal composed of a high pulse, and the falling wave becomes a digital signal composed of a low pulse, and is output on one digital signal line. You. In this case, the wave width (or slope) of the rising wave of the triangular wave is expressed as the pulse width of the high-pulse digital signal, and the wave width (or slope) of the falling wave is expressed as the pulse width of the low-pulse digital signal. According to the device according to the third aspect, two types of analog signals can be converted into digital signals by using one A / D converter and transmitted by one digital signal line. Therefore, in addition to halving the number of signal lines, the number of A / D converters can be halved.
According to the drive voltage and drive current detection device for the fan motor according to the fourth feature, the analog drive voltage and the analog drive current of the fan motor are converted into one by using the two-signal simultaneous transmission device according to the third feature. It can be detected as a pulse width of a high pulse digital signal and a pulse width of a low pulse digital signal on a digital signal line. Therefore, the number of signal lines for detecting the drive voltage and drive current of the fan motor can be reduced by half, and the number of A / D converters can be reduced by half.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a diagram for explaining an example of an embodiment of a two-signal simultaneous transmission method according to the present invention. FIG. 2 is another example of an embodiment of a two-signal simultaneous transmission method according to the present invention. It is a lineblock diagram showing an example of an embodiment of a two signal simultaneous transmission device concerning the present invention. FIG. 3 is a diagram showing an example of an output signal in the embodiment shown in FIG. FIG. 4 is a configuration diagram illustrating an example of an apparatus using a two-signal simultaneous transmission apparatus.

An example of an embodiment of the two-signal simultaneous transmission method according to the present invention will be described with reference to FIG. 1 is a transmitting means and 2 is a receiving means. One digital signal line 3 is connected between the transmitting means 1 and the receiving means 2. In the transmitting means 1, for example, two kinds of different signals of the A signal and the B signal are set as one set, and for one of the signals, for example, the A signal, this is a digital signal composed of a high pulse, and the A signal to be transmitted is The components or contents are expressed by the pulse width of the high pulse signal and sent out to the one digital signal line 3, and the other B signal is converted into a digital signal composed of low pulses, and the B signal component to be sent is The content is expressed by the pulse width of the low pulse signal and sent out on the same digital signal line 3. That is, on the same digital signal line 3, the A signal is represented by the reciprocals 1 / t ₁ and 1 / t ₃ of the pulse widths t ₁ and t ₃ of the signal components of the A signal, and the t ₂ signal Is a delimiter between the t ₁ signal and the t ₃ signal. The B signal has a signal component, such as data, which is the reciprocal of the pulse width t ₂ or t ₄ of each low pulse 1 / t ₂ , 1
/ T ₄ , and the t ₃ signal is a separator between the t ₂ signal and the t ₄ signal. In this way, one signal serves as a delimiter of the other signal, and two types of signals, high pulse and low pulse, are sent on one signal line. Two types of signals, high pulse and low pulse, transmitted through one digital signal line 3 are received by the receiving means 2 and are separated into high pulse signals and low pulse signals and decoded.

Referring to FIGS. 2 and 3, another embodiment of the two-signal simultaneous transmission method according to the present invention and an embodiment of the two-signal simultaneous transmission apparatus according to the present invention will be described.
In FIG. 2, 10 and 20 are input lines, 30 is input line switching means, 40 is an integration circuit, and 50 is a comparator.
The input lines 10 and 20 are connected to different types of analog signals, for example, an A signal and a B signal. The input line switching means 30 includes a switching contact a of the input line 10 and a switching contact b of the input line 20 at a fixed timing.
And a means for switching to the inverting input terminal of the operational amplifier 41 of the integration circuit 40. The integration circuit 40 and the operational amplifier 41, and a capacitor C ₂ resistors R _3, R ₄ Prefecture. The reference voltage V _REF is applied to the non-inverting input terminal of the operational amplifier 41.
Is added. The reference voltage V _REF is smaller than the input terminal point voltage V _{5 of the} input line 10 (V _REF <V ₅ ), and is larger than the input terminal point voltage V _{6 of} the input line 20 (V _REF).
> V ₅ ) is selected in advance. The comparator 50 converts an analog signal into a digital signal.
It functions as a D converter and connects one output line 51.

The analog signal (A signal) of the input line 10 and the analog signal (B signal) of the input line 20 are contacted at a fixed timing by an input line switching means 30.
And the contact b are alternately switched and input to the inverting input terminal of the operational amplifier 41 of the integration circuit 40, and the output terminal voltage V
₈ is output as a triangular wave signal shown in FIG.
That is, while the input line switching means 30 connects the contact a of the input line 10, the analog A signal from the input line 10 is input to the integration circuit 40, and the voltage V ₅
And the relationship between the reference voltage V _REF, the output voltage V ₈ from the integrating circuit 40 becomes a rising wave. While the input line switching means 30 is connected to the contact b of the input line 20, the analog B signal from the input line 20 is output from the integrating circuit.
It is input to 40, and the relationship between the voltage V ₆ and the reference voltage V _REF, the output voltage V ₈ from the integrating circuit 40 becomes a falling wave. The switching timing of the contact b of the contact a and the input line 20 of the input line 10 by input line switching means 30, the contact from the contact a when the output is increased up to a maximum value V _MAX a predetermined triangular wave from the integrator 40 b, and when the output of the triangular wave falls to a predetermined minimum value V _MIN , the contact can be switched from the contact b to the contact a. Thus, for example, input lines 10, 20 respectively
The contents or components of the analog A signal and the analog B signal represented by the voltages V ₅ and V ₆ of the following are the output signals from the integrator circuit 40, respectively. Is represented by The switching timing may employ switching timing by another method.

The output signal from the integrating circuit 40 is sent to a comparator 50 as a triangular wave, and the comparator 50 converts the rising wave portion of the triangular wave into a high-pulse digital signal having the pulse width of the rising wave. The falling part of the triangular wave is output to the output line 51 as a low pulse digital signal with the pulse width of the falling wave. That is, as shown in FIG. 3, the output terminal voltage V ₉ of the output line 51 from the comparator 50 is such that a high-pulse digital signal and a low-pulse digital signal are alternately output, and each pulse width (time) t of the high pulse ₄ ,
t _6, t _8, t ₁₀ corresponds to the wave width of each rising wave of the triangular wave. Each pulse width (time) of low pulse
t ₅ , t ₇ , and t ₉ correspond to the width of each falling wave of the triangular wave. Each pulse width (time) t of the digital signal output from the comparator 50 can be expressed by the following equation (1).

1 / t = (V _REF −V _IN ) / C · R (ΔV−V _REF ) (1) where V _{REF is} a reference voltage of the integration circuit 50 V _{IN is an} input voltage V ₅ , V ₆ C: C ₂ R: R ₃ , R ₄ ΔV: threshold value of comparator 50

That is, the signal components and contents of the analog signals of the A signal and the B signal from the two input lines 10 and 20 are the high pulse or the low pulse of the digital signal output from the comparator 50 to one output line 51. It is expressed by the pulse width t or its reciprocal 1 / t (frequency).

In FIG. 2, an A signal as an analog signal input to the input line 10 is used as an analog drive current of a blower fan used in, for example, a water heater or a combustor, and the analog signal input to the input line 20 is used. B as a signal
By making the signal an analog drive voltage of the fan, an analog drive current and an analog drive voltage applied to the fan are output as a high pulse signal and a low pulse signal on one digital signal output line 51 from the comparator 50. Can be detected.

Further description will be made with reference to FIG. It is a block diagram which shows the example of the water heater using the two signal simultaneous transmission apparatus of this invention. Inside the casing 61 of the water heater, a burner 62 and a heat exchanger 63 are arranged. A sirocco fan 66 driven by a fan motor 65 is disposed inside a fan case 64 that is continuous with a lower side of the casing 61, and an exhaust port 67 is formed at an upper portion of the casing 61. The burner 62 is connected to a fuel supply pipe 68 for supplying a fuel such as gas or oil, and the heat exchanger 63 is connected to a water supply pipe 70 for supplying water. Fuel supply pipe
Valves 71 and 72 are interposed in 68 and the water supply pipe 70, and these valves 71 and 72 are controlled by a hot water supply control unit 73. The fan motor 65 is controlled by, for example, a commercial power supply 75 of AC 100 volts, a power control unit 77 that switches DC power from the rectifying and smoothing unit 76 based on a control pulse and supplies the DC power from the rectifying and smoothing unit 76 as drive power to the fan motor 65, A rotational speed detecting means 78 for detecting the rotational speed of the fan motor 65, an output current of the rectifying and smoothing means 76, that is, a means 81 for detecting a driving current for the fan motor 65, and an output voltage of the rectifying and smoothing means 76, that is, the fan motor 65 A fan motor drive voltage / current detection unit 80 internally including a drive voltage detection unit 82 for detecting a drive voltage, and a rotation speed command signal, a rotation speed detected by the rotation speed detection unit 78, and an actual flow to the fan motor 65. A duty ratio control means 83 for controlling a duty ratio of a control pulse based on the current so that the rotation speed of the fan motor 65 becomes the command rotation speed; Actual current calculating means 84 for calculating the actual current actually flowing to the fan motor 65 based on the detected drive current and the detected drive voltage by the motor drive current voltage detection means 80, and the optimum air flow rate based on the combustion amount of the burner 62. It is composed of a fan case 64 and a casing 61 based on an optimum air flow amount judging means 85 for judging, and a real current flowing through the fan motor 65 calculated by the real current calculating means 84 and a fan rotation speed by the rotation speed detecting means 78. Flow path resistance determining means 86 for determining the flow path resistance of the blower flow path,
The optimum rotation speed of the fan motor 65 is determined based on the optimum blowing amount determined by the optimum blowing amount determination unit 85 and the flow path resistance determined by the flow path resistance determination unit 86, and the rotation speed of the fan motor 65 is determined. Optimum rotation speed discriminating means 87 for supplying a rotation speed command signal to the duty ratio control means 83 so as to be the optimum rotation speed, and abnormal combustion based on the flow path resistance determined by the flow path resistance determining means 86. An abnormality determining means 88 for determining and an abnormality processing means 89 for outputting a stop signal to the hot water supply control unit 73 to stop the combustion of the burner 62 when the abnormality determining means 88 determines that the combustion is abnormal. Further, a temperature detecting means 90 for detecting an intake air temperature blown by the fan 66.
And a current correcting means 91. When judging an abnormality in the airflow path based on the state of the flow path resistance, it is difficult to determine whether it is due to clogging of soot or the like or because the fluctuation of the flow path resistance is included due to the temperature. means
The reason is that the 91 corrects the current value based on the intake air temperature, and the abnormality determining means 88 can determine the abnormality of the air flow path based on the flow path resistance excluding the variation of the flow path resistance due to the intake air temperature.

In the above description, the fan motor drive current / voltage detection means 80 uses the two-signal simultaneous transmission device described above. That is, two input lines 1 from the output line of the rectifying / smoothing means 76 to the fan motor drive current / voltage detection means 80.
0, 20 are connected, and fan motor drive current / voltage detection means 8
From 0, one output line 51 is connected to the actual current calculating means 84. That is, the fan motor drive current / voltage detection means 80 incorporates the input line switching means 30, the integration circuit 40, and the comparator 50 described above, and the drive for driving the fan motor 65 output from the rectification smoothing means 76. The current and the drive voltage are converted into analog signals and the two input lines 10,
20, are alternately taken into the fan motor drive current / voltage detection means 80, and are output to a single output line 51 as a high / low digital signal having a pulse width as a signal component. It is sent to the means 84. The calculation by the actual current calculation means 84 is, for example, a high pulse component (pulse width) from the transmitted digital signal.
By extracting the components (pulse width) of the low pulse and the low pulse, respectively, and applying them to the relationship between the drive current, the drive voltage, and the actual current of the fan motor 65 obtained in advance by experiment,
The actual current can be calculated. When the actual current is calculated, the flow path resistance of the air flow path can be determined based on the actual current and the number of revolutions of the fan by the revolution number detecting means 78.

[0018]

According to the present invention, there is provided the above construction.
According to the two-signal simultaneous transmission method described in (1), one signal component of the two types of signals is represented by the pulse width of a high pulse on one digital signal line, and the other signal component is the same signal component.
By expressing the pulse width of a low pulse on one digital signal line, two types of signals are mixed and transmitted over time by one digital signal line. Signals can be transmitted by signal lines, and required signal lines can be halved.
According to the two-signal simultaneous transmission method of the second aspect, in addition to the effect of the method of the first aspect, two types of analog signals are alternately switched, and the two types of analog signals are switched via one integration circuit. By sending the signal to one comparator, one of the two analog signals is converted into a high-pulse digital signal having a pulse width as a signal component, and the other analog signal is converted into a pulse width as a signal component. Since the digital signal is converted into a low-pulse digital signal and is mixed and output over time on one output line from the comparator, two types of analog signals are converted into one A signal.
The signal can be converted into a digital signal by using a / D converter and transmitted by one digital signal line. Therefore, in addition to halving the number of signal lines, the number of A / D converters can be halved. According to the two-signal simultaneous transmission device of the third aspect, a pair of input lines for inputting two types of analog signals and a pair of analog signals input through the pair of input lines are used as one of them. One integration circuit for integrating so as to form a triangular wave signal having a rising wave and the other being a falling wave, and the pair of input signals being provided when the integration values of the integration circuit become predetermined maximum and minimum values, respectively. An input line switching means for switching a line, a triangular wave signal output from the integrating circuit being input, and a rising wave of the triangular wave signal being converted into a high-pulse digital signal having a pulse width of a pulse width, and a falling wave having a pulse width of Has one comparator that converts the digital signal into a low-pulse digital signal having a pulse width and outputs both digital signals with time. In, 2
One type of analog signal can be converted into a digital signal by using one A / D converter and transmitted by one digital signal line. Therefore, in addition to halving the number of signal lines, the number of A / D converters can be halved. According to the drive voltage and drive current detection device for a fan motor described in claim 4, the two-signal simultaneous transmission device according to claim 3 is used. By connecting an analog drive voltage detection line for the fan motor and an analog drive current detection line for the fan motor to the other, the drive voltage and drive current of the fan motor are connected to one output line from the comparator. Since the pulse width of the high-pulse digital signal and the pulse width of the low-pulse digital signal that are output over time are detected, the analog drive voltage and the analog drive current of the fan motor are set to a high pulse on one digital signal line. And the pulse width of the low pulse digital signal. Therefore, the number of signal lines for detecting the drive voltage and drive current of the fan motor can be reduced by half, and the number of A / D converters can be reduced by half.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of an embodiment of a two-signal simultaneous transmission method according to the present invention.

FIG. 2 is a configuration diagram showing another example of the embodiment of the two-signal simultaneous transmission method according to the present invention and an example of the embodiment of the two-signal simultaneous transmission device according to the present invention;

FIG. 3 is a diagram showing an example of an output signal in the embodiment shown in FIG. 2;

FIG. 4 is a configuration diagram illustrating an example of an apparatus using a two-signal simultaneous transmission apparatus.

FIG. 5 is a diagram showing an example of a conventional communication method.

FIG. 6 is a diagram showing an example of another conventional communication method.

[Explanation of symbols]

 1 Transmitting means 2 Receiving means 3 Digital signal line 10, 20 Input line 30 Input line switching means 40 Integrating circuit 50 Comparator 51 Output line 80 Fan motor drive current / voltage detector

Continued on the front page (72) Inventor Iwao Iwaeda 93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref.

Claims (4)

[Claims] A signal component of one of two kinds of signals is set to 1
By expressing the pulse width of a high pulse on one digital signal line and expressing the other signal component by the pulse width of a low pulse on the same digital signal line, two types of signals can be represented by one digital signal line. And transmitting the mixed signals over time. 2. An analog signal of one of the two kinds of analog signals is pulse-switched by alternately switching two kinds of analog signals and sending it to one comparator through one integration circuit. The digital signal is converted into a high-pulse digital signal having a width as a signal component, and the other analog signal is converted into a low-pulse digital signal having a pulse width as a signal component. 2. The two-signal simultaneous transmission method according to claim 1, wherein the two-signal simultaneous transmission is performed. 3. A pair of input lines for inputting two types of analog signals, and a pair of analog signals input via the pair of input lines, a triangular wave having one rising wave and the other a falling wave. One integration circuit for integrating so as to become a signal, input line switching means for switching the pair of input lines when the integration value of the integration circuit becomes a predetermined maximum value and minimum value, respectively, The triangular wave signal output from the circuit is input, and the rising wave of the triangular wave signal is converted into a high-pulse digital signal having a pulse width of a pulse width, and the falling wave is converted into a low-pulse digital signal having a pulse width of a pulse width. And one comparator for outputting both digital signals with time.
Signal simultaneous transmission device 4. A two-signal simultaneous transmission device according to claim 3, wherein one of a pair of input lines of said two-signal simultaneous transmission device is connected to a detection line for an analog drive voltage for a fan motor, and the other is a fan motor. By connecting the analog drive current detection line to the fan motor drive voltage and drive current, the pulse width of the high-pulse digital signal and the low-pulse digital signal output over time to one output line from the comparator. A drive current and drive voltage detection device for a fan motor, which is detected as a pulse width of a signal.