JPS61139765A - Circuit for discriminating polarity of transformer winding - Google Patents

Abstract

PURPOSE:To eliminate the erroneous discrimination of polarity due to the discon nection of winding, by adding a pulse of an one-and-half cycle to the primary side of a transformer and discriminating the polarity of the winding of the transformer on the basis of the outputs of three flip-flop by a sampling pulse at every half cycle. CONSTITUTION:The pulse A or B of an one-and-half cycle from a pulse oscillator 7 is applied to the primary side of a transformer T and inputted to a comparator 3 while output C or D is inputted to an exclusive OR circuit 5. The output from the secondary side of the transformer T is inputted to the circuit 5 through a comparator 4 and, if the polarities of windings are same, a 0 level is outputted and, if reverse, an 1 level is outputted. Pulses h, i, j at every half cycle from a sampling elock generator 8 are respectively inputted to FF11, 12, 13 and, if the polarities of windings are same, all of the outputs of FF come to a 0 level and, if reverse, all of them come to an 1 level. When the winding is disconnected, voltage by the induction of a commercial power source is inducted to the secondary side of the transformer T and the outputs of FF come to 0, 1, 0 levels.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a transformer winding polarity determining circuit that determines the polarity of a transformer winding.

It is desirable that the transformer winding polarity determination circuit does not output erroneous polarity determination data, but outputs data indicating this when 1@ wire breakage occurs.

[Conventional technology]

Figure 5 is a block diagram of a conventional transformer winding polarity discrimination circuit, and Figure 6 is a time cheat of the waveforms of each part of the circuit in Figure 5. (A) to (D) are at points 3 to 6 in Figure 5. Compatible.

FIG. 7 shows waveform ties and cheats at various parts of the transformer T shown in FIG. 5 when the winding is broken.

In the figure, 1 is an AC oscillator, 2 is a 1-pulse oscillator, 3°4 is a comparator, 5 is an exclusive OR circuit, and 6 is a flip-flop (
(hereinafter referred to as FF), T indicates a transformer.

In FIG. 5, in order to determine the polarity of the winding of the transformer T, an AC voltage as shown in FIG.
6(B) to obtain an output with a waveform as shown in FIG. 6(B) and input it to the exclusive OR circuit 5.

On the other hand, if the winding polarities are the same, the secondary side of the transformer T outputs a voltage with the same waveform as shown in Figure 6 (A), and the comparator 4 outputs a voltage with the same waveform as shown in Figure 6 (B). If the polarity of the winding of the transformer T is reversed, an output with a waveform as shown in FIG. 6(C) is obtained and input to the exclusive OR circuit 5.

Therefore, if the polarities of the windings are the same, the exclusive OR circuit 5 continuously outputs the 0 level, and if the polarities are reversed, the level is continuously output and input to the D terminal of the FF 6.

A pulse as shown in FIG. 6 (CD) is input to the CLK terminal of the FF 6 from the 1-pulse oscillator 2 that outputs 1 pulse at approximately the center of the waveform shown in FIG. 6 (A). Since the level manually applied to the D terminal is hit, it is better than FF6.
If the polarities of the windings are the same, an O level is output, and if the polarities are opposite, a level is output.

This means that the output pulse of the 1-pulse oscillator 2 is shown in Fig. 6 (D).
Even if it is located in the center of the 10 voltages in Figure 6 < A), as in the case of A in Figure 6, even if it is located in the middle of the - voltage in Figure 6 (A) shown in Figure 6, the voltage will be at the same level than FF6. Data is output, and in particular, the polarity of the winding of the pulse of the one-pulse oscillator 2 can be determined without being aware of the positive and negative sides of the AC voltage.

[Problem that the invention seeks to solve]

However, if the winding of the transformer T is disconnected, a voltage as shown in Figure 7 (B) is induced on the secondary side due to induction from the commercial power supply, and the output of the comparator 4 is as shown in Figure 7 (C). As shown in FIG. 7(A), the output of the comparator 3 is the same as that in FIG. 6(B), so the output of the exclusive OR circuit 5 is is the θ level, and 2 is the level, which is input to the D terminal of FF6.

Therefore, if the input to the D terminal of FF6 is struck with the output of the pulse oscillator 2, and the pulse shown in Figure 7A is struck, the output of FF6 will be at 0 level and the polarity of the winding of the transformer T will be If it is determined that they are the same, and the pulse shown at the beginning of FIG.

That is, there are problems in that it is not possible to determine if the winding is broken, and the polarity of the winding can be determined in two ways even though the transformer is the same.

[Means for solving problems]

The above problem can be solved by applying a pulse of one and a half cycles to the primary side of the transformer, and manually inputting the exclusive OR circuit via a comparator that compares this pulse with the pulse generated on the secondary side with the ground level. The output is inputted to three flip-flops, and each sampling pulse of each half cycle of the one-and-a-half cycle pulse is inputted to the clock terminal of each of the three flip-flops. This problem is solved by the transformer winding polarity determining circuit of the present invention, which determines the polarity of the transformer winding based on the output of the transformer winding.

[Effect]

According to the present invention, if the transformer is not disconnected, the three F'F outputs are all level or 0 depending on the winding polarity, and if the transformer is disconnected, the level and 0 are output. Therefore, disconnection of the winding of the transformer can be determined, and erroneous polarity determination data will not be output.

〔Example〕

FIG. 1 is a block diagram of a transformer winding polarity determination circuit according to an embodiment of the present invention, and FIG. 2 is a time cheat of waveforms of each part of the circuit in FIG. )~
(J) corresponds to points a, c, e, and g to j in FIG. 3 and 4 are time cheats of the waveforms of various parts when the winding of the transformer T in FIG. 1 is broken.

In the figure, 7 is a pulse oscillator with one and a half cycles, 8 is a sampling clock generator with one and a half cycle pulses, 9 is a counter, 10 is a decoder, 11 to 13 are FFs, 14 is an AND circuit, and 15.16 is a NOR The same reference numerals indicate the same functions throughout the drawings.

To explain the operation of the circuit shown in FIG. 1, the one and a half cycle pulse oscillator 7 outputs positive/negative positive or negative/positive/negative pulses as shown in FIG. 2 (C) or (D
) is input to the exclusive OR circuit 5.

On the other hand, from the secondary side of the transformer T, if the winding polarities are the same, a pulse with the same waveform as that shown in Figure 2 (A) or (B) will be output; if the polarity is reversed, a pulse with the same waveform as that shown in Figure 2 (B) or (A ) is output and input to the comparator 4. If the polarities of the windings are the same, the pulse of FIG. 2 (C) or (D) is output; if the polarity is opposite, the pulse of Since the pulse shown in figure (D) or (C) is output and input to the exclusive OR circuit 5,
If the polarities of the windings are the same, the output of the exclusive OR circuit 5 will output a 0 level as shown in FIG. D
input to the terminal.

On the other hand, the output as shown in FIG. 2 (G) from the sampling clock generator 8, which generates a sampling clock for every half cycle of one half pulse, is input to the counter 9, where it is counted, and the count value is sent to the decoder. 10, and from the output of the decoder 10, it is shown in Figure 2 (H) (1) (
A pulse separated into one pulse as shown in J) is output and input to the CLK terminal of FFII and 12.13, respectively, and hits the level input to the D terminal, so FF1
The outputs of 1.12.13 will all be 0 level if the polarities of the windings of the transformer T are the same, and all outputs will be level level if the polarities are reversed.

Therefore, if the polarities of the windings are the same, the terminal A1 of the output of the NOR circuit 15 is at the level, and the output of the AND circuit 14 and the terminal A of the output of the NOR circuit 16 are at 0 level, and vice versa. If so, 〇 to the terminal is a level, and the others are O level, and the polarity of the winding of the transformer T can be determined.

Here, if the winding of the transformer T is disconnected, a voltage as shown in FIG. 3(B) will be induced on the secondary side of the transformer T by induction from the commercial power supply, and
Assuming that a pulse of one and a half cycles as shown in FIG. 3(A) is input to the primary side of the As shown in Figure 3 (C) <0. ! , it becomes 0 level and FFII.

12.13 and hit this level with the pulses shown in FIG. 2 (H), (I), and (J) from the decoder 10, F
The output of FII, 12.13 is 0.1°0 level,
〇 to the output terminal of the AND circuit 14 is at O level, the output terminal A1 of the NOR circuit 15 is also at O level, and the output terminal A2 of the NOR circuit 16 is at the level. Since no discrimination is made, winding breaks can be detected and polarity will not be incorrectly determined.

Here, if the zero cross point of the voltage induced from the commercial power supply as shown in Fig. 4 (B) coincides with the one-cycle and half pulse shown in Fig. 4 (A), the outputs of comparators 4 and 3 is as shown in FIG. 4(C)(D), and the exclusive OR circuit 5
The output of <0.0. is shown in (E). l or (F
1.0.1 as shown in ), but since O and Lebel are always output, the terminal A2 is Lebel and the other terminals are O level, a disconnection is detected and the polarity is not determined.

However, if the output of the oscillator 7 is a one-cycle pulse, the output of the exclusive OR circuit 5 may become 0.0, and in this case, a disconnection is not detected and the polarity is incorrectly determined. Therefore, the output of the oscillator 7 is one and a half cycles.

〔Effect of the invention〕

As described in detail above, according to the present invention, there is an effect that disconnection of the winding of the transformer can be detected and that erroneous winding polarity determination data is not output.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a transformer winding polarity discrimination circuit according to an embodiment of the present invention, Fig. 2 is a time cheat of waveforms of various parts of the circuit of Fig. 1, Fig. Figure 5 is a block diagram of a conventional transformer winding polarity determination circuit. Figure 6 is a time cheat of waveforms at each part of the circuit in Figure 5. Figure 7 is a time cheat of waveforms at various parts in the case of winding breakage. This is a time cheat of the waveforms of various parts when the winding of the transformer T shown in Figure 5 is broken. In the figure, l is an AC oscillator, 2 is a 1-pulse oscillator, 3.4 is a comparator, 5 is an exclusive OR circuit, 6.11. '12.13 is a flip-flop, 7 is a one and a half cycle pulse oscillator, 8 is a sampling clock generator, 9 is a counter, 10 is a decoder, 14 is an AND circuit, 15.16 is a NOR circuit, and T is a transformer. 2nd I21 (E). , t'+t. (6r) JLrhi"-CH) -Low (1) -11-1(J)-1-1- Akira 3 Figure 4 Figure 4 (f)

Claims (1)

[Claims] A pulse of one and a half cycles is applied to the primary side of the transformer, and this pulse and the pulse generated on the secondary side are input to an exclusive OR circuit via a comparator that compares each with the ground level, and the output is Three flip-flops are input, and each half-cycle sampling pulse of the one-and-a-half cycle pulse is input to the clock terminal of each of the three flip-flops, and the output of the three flip-flops causes a transformer to A transformer winding polarity determining circuit characterized in that the polarity of the winding is determined.