JPH0257018A - Power line carrier inverter device - Google Patents

Abstract

PURPOSE:To cause a high frequency level and a low frequency level to be same in the output of an injecting circuit by controlling the firing time width of a rectifying circuit and obtaining a reciprocal ratio for the low frequency level and high frequency level in the output so that the voltage of a capacitor can be a setting value ratio at the time of a low frequency and a high frequency in the output of the injecting circuit. CONSTITUTION:A CPU18 sends a gate command, which turns on a thyristor 2 synchronously to the rise of a phase reference signal and turns off the thyristor 2 after a prescribed time T1, to a phase control circuit 8. Thus, a rectifying circuit 2 outputs a direct current, for which phase control is executed. For example, when the setting value of a setter 17 is '3', the CPU18 controls time width T1 and T2 so that the ratio of 3 to 1 can be obtained in a mark and a space for the voltage of a capacitor 4 and the low frequency output level and high frequency output level can be made the same for the output which is sent from an injecting circuit 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inverter device for power line transport used as a signal injection means in power line transport.

[Conventional technology]

FIG. 5 is a circuit diagram showing a conventional inverter device of this type disclosed in, for example, Japanese Unexamined Patent Publication No. 18026/1983. In the figure, AC is an alternating current power supply, ■ is a rectifier circuit, and 2
．． 2 is a Sirisk, 3.3 is a diode, 4 is a smoothing capacitor, 5 is an inverter consisting of a transistor 5.5, 6 is an injection circuit, 7 is a variable resistor for adjusting the injection amount, 8
1 is a phase control circuit for the rectifier circuit 1, 9 is a base drive circuit for the inverter 5, 10 is a frequency shift signal (FS signal) generation circuit, 11 is a signal generation circuit for creating a transmission code, and 12 is a transmission activation circuit. This transmission starting circuit 12 is shown in FIG.
) Outputs a transmission activation signal as shown in (). In response to this transmission activation signal, the signal generating circuit 11 sends out a signal in a predetermined code format (FIG. 6(B)).

The alternating current from the alternating current power supply AC is converted into direct current by the rectifier circuit 1, and charges the capacitor 4. The charging energy of the capacitor 4 is converted into alternating current at a controlled voltage and frequency by an inverter 5, and then supplied to an injection circuit 6. As shown in FIG.
Received at 3. As described above, the signal generation circuit 11 introduces the signal shown in FIG. 6(A) and generates a signal having a predetermined code format (FIG. 6(B)).
Send to. The FS signal generation circuit 10 is a signal generation circuit 11
During the period when the output is rHJ, it sends out a low frequency signal and
A high frequency signal is transmitted during the period when the signal is "L". During the period when the output of the transmission drive circuit 12 is "H", the HAS drive circuit 9 outputs the inverter 5 according to the output of the FSS signal generation circuit 10.
The transistors 5Δ and 513 are controlled by ○N10FF.

As a result, the injection device 6 sends out the signal shown in FIG. For example, dl of this signal is marked,
d2 becomes a space.

[Problem to be solved by the invention]

In this way, in the conventional configuration, since the level of the signal output from the inverter 5 is constant, the levels of the margin dl and the space d2, which have different frequencies, change depending on the impedance of the injection circuit 6, and the level of the signal output from the inverter 5 changes depending on the impedance of the injection circuit 6. There was a risk of reception failure.

This invention was made to solve the above problem.
It is an object of the present invention to provide a power transfer inverter device that can eliminate the influence of the impedance of an injection circuit on the level of a signal sent from the injection circuit.

[Failure to solve the problem]

In order to achieve the above object, the present invention includes a phase reference generation circuit that creates a phase reference signal synchronized with an AC input voltage;
A setting device that sets the inverse ratio of the low-frequency output level and high-frequency output level of the output of the injection circuit, and the output of the frequency shift signal generation circuit that detects the frequency switching timing and synchronizes with the frequency switching timing. do"
- has an arithmetic processing circuit that sends a command to change the firing time width of the rectifier to the phase control circuit, and the arithmetic processing circuit has an inverse ratio as described above when the voltage of the capacitor is at a low frequency and at a high frequency. Thus, the firing time width is changed based on the phase reference signal.

[Effect]

In this invention, the firing time width of the rectifier circuit is controlled so that the voltage of the capacitor becomes a set value ratio between the low frequency and high frequency of the output of the injection circuit, and the -1-set value ratio is as follows: Since the low-frequency output level and the high-frequency output level of the output are set to be an inverse ratio, the low-frequency output level and the high-frequency output level are the same.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 16 denotes a phase reference generation circuit, which inputs the voltage of the AC power supply, creates a reference signal with the waveform shown in FIG. 2 (F), and sends it to the arithmetic processing unit (CPU) 18 do. Reference numeral 17 is a setting device, and the receiving point (receiving device 13
), the levels of the mark and space are calculated, and the ratio of both levels is, for example, 1:3.
If so, the value "3" is set and the value is sent to the CPU.
Send on 18th. The CPU 8 turns on the thyristor 2 in synchronization with the rising edge of the phase reference signal and waits for a predetermined time T.
After l, a gate command to turn it off is sent to the phase control circuit 8. As a result, the rectifier circuit 2 outputs a phase-controlled direct current (shaded area) as shown in FIG. 2(G). The capacitor 4 is charged to the maximum value in the shaded area, and then the cycle of gradually decreasing power is repeated by sending power to the injection circuit 6 through the inverter 5 (FIG. 2 (H)). As shown in Figure 3, when the ignition time of Iristor 2.2 is increased from T1 to T2, the charging voltage to the capacitor 4 becomes as shown in Figure 3 (J
), the period of T1 becomes a space, and the period of T2
If the phase control circuit 8 is controlled by the CPU 18 so that the period becomes a mark signal, a signal is obtained in which the voltage is low in the space period and high in the mark signal period, as shown in FIG. 3(K). be able to. If the setting value of the setting device 17 is, for example, "3", the CPU 18 controls the time widths T1 and T2 so that the voltage of the capacitor 4 is 3:1 between the mark and the space, and the voltage from the injection circuit 6 is The low frequency output level and the high frequency output level of the output to be sent out are made to be the same. The CPU 18 takes in the FS signal, detects the transition timing from the spacing period to the mark signal period, and vice versa, and in synchronization with this timing, commands the switching of the firing time width. Also, C.P.
The UI 8 sends a signal having the waveform shown in FIG. 6(A) to the signal generation circuit 11 and the transmission drive circuit 12.

〔Effect of the invention〕

As explained above, this invention controls the ignition time width of the rectifier circuit so that the voltage of the capacitor becomes the set value ratio between the low frequency and high frequency of the output of the injection circuit, and the set value ratio is Since the low-frequency output level and the high-frequency output level of the above output are made to be in the inverse ratio, the high-frequency level and the low-frequency level of the output of the injection circuit can be made the same, so the reception rate of the transmitted signal can be improved compared to the conventional one. This can be significantly improved compared to the previous model.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an embodiment of this invention, Figures 2 and 3 are
4 is a diagram showing the transmitting and receiving system, FIG. 5 is a circuit diagram of a conventional inverter device, and FIG. 6 is a waveform diagram of various parts in the conventional example. In the figure, 2 - rectifier circuit, 4 - capacitor, 5 - inverter, 6 - injection circuit, 9 - base drive circuit, 10 -
FS signal generation circuit, 11-signal generation circuit, 12-transmission starting circuit, 16-phase reference generation circuit, 17-setting device, 1
B-CPU. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A rectifier that receives alternating current, a capacitor that smoothes the direct current output of the rectifier, an inverter that converts the direct current into alternating current and sends it to the injection circuit, a phase control circuit that controls the phase of the switching elements that make up the rectifier, and the inverter. An inverter comprising a drive circuit that drives the constituent switching elements, a signal generation circuit that sends a signal in a predetermined code format to a frequency shift signal generation circuit, and a transmission activation circuit that sends a transmission activation signal to the signal generation circuit and the drive circuit. The device includes a phase reference generation circuit that creates a phase reference signal synchronized with the alternating current voltage, a setting device that sets an inverse ratio between a low frequency output level and a high frequency output level of the output of the injection circuit, and the frequency shift signal. an arithmetic processing circuit that captures the output of the generator circuit, detects frequency switching timing, and sends a command to change the firing time width of the rectifier to the phase control circuit in synchronization with the frequency switching timing; An inverter for power line transport, characterized in that the arithmetic processing circuit changes the firing time width based on the phase reference signal so that the voltage of the capacitor is in the inverse ratio between low frequency and high frequency. Device.