CN218040784U - Frequency converter system with double power supply loops and frequency converter with double power supply loops - Google Patents

Abstract

The utility model relates to a converter system and converter of two power supply circuit, it can realize the automatic quick reset of the converter trouble that two power supply circuit switch-over in-process caused. The frequency converter system with the double power supply loops comprises a first power supply loop, a second power supply loop, a control unit and a frequency converter group, wherein the frequency converter group comprises at least two frequency converters, the first power supply loop comprises a first switch, the second power supply loop comprises a second switch, the control unit controls at most one of the first switch and the second switch to be in a closed state, the frequency converter system further comprises an automatic restorer, the automatic restorer further comprises a first input end, a second input end and a reset output end, the first input end is connected with an auxiliary contact of the first switch, the second input end is connected with an auxiliary contact of the second switch, and the reset output end is connected with a reset port of the frequency converter.

Description

Frequency converter system with double power supply loops and frequency converter with double power supply loops

Technical Field

The utility model relates to a converter system especially relates to converter system with two supply circuit. Furthermore, the utility model discloses still relate to the converter that has two supply circuit.

Background

The frequency converter is important equipment on an automatic production line, and in order to ensure normal production, especially important industrial occasions, the production equipment can be provided with double power supply loops, and when one power supply fails or other reasons are cut off, the production equipment can be kept to return to work as soon as possible through a standby power supply loop. The frequency converters simultaneously work on an automatic production line, so that the frequency converters with the same or different specifications can work cooperatively again after being reset respectively after power supply switching, the states of different frequency converters can be different after power supply switching due to different states, the time of power failure occurrence is random, the process of resetting and restarting the frequency converters with different states one by one needs complex operation, and the time and labor cost are also large.

Therefore, a frequency converter system capable of quickly realizing automatic reset when switching a power supply loop is a technical problem to be continuously solved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two power supply loop's converter system, its automatic quick reset that can realize two power supply loop switching process caused converter trouble. The frequency converter system with the double power supply loops comprises a first power supply loop, a second power supply loop, a control unit and a frequency converter group, wherein the frequency converter group comprises at least two frequency converters, the first power supply loop comprises a first switch, the second power supply loop comprises a second switch, the control unit controls at most one of the first switch and the second switch to be in a closed state, the frequency converter system further comprises an automatic restorer, the automatic restorer further comprises a first input end, a second input end and a reset output end, the first input end is connected with an auxiliary contact of the first switch, the second input end is connected with an auxiliary contact of the second switch, and the reset output end is connected with a reset port of the frequency converter.

Preferably, the automatic reset device has an exclusive or gate, two input terminals of the exclusive or gate are connected to the first input terminal and the second input terminal, and a pulse generator, an input terminal of the pulse generator is connected to an output terminal of the exclusive or gate, and an output terminal of the pulse generator is connected to an output terminal of the automatic reset device.

Preferably, the pulse generator further comprises a differentiating circuit for generating the reset pulse signal according to a positive impulse response obtained by the differentiating circuit, and the pulse generator has an output pulse width of 1000 ms.

An object of the utility model is also to provide a converter of two power supply circuit, it includes first power supply circuit, second power supply circuit and the control unit, wherein, first power supply circuit includes first switch, second power supply circuit includes the second switch, the control unit control at most one is in the closure state in first switch and the second switch, still includes automatic re-setting ware, automatic re-setting ware further includes first input, second input and the output that resets, first input with the auxiliary contact of first switch is connected, the second input with the auxiliary contact of second switch is connected, the output that resets with the mouth that resets of converter is connected.

Preferably, the automatic reset device has an exclusive or gate, two input ends of the exclusive or gate are connected with the first input end and the second input end, and the automatic reset device also has a pulse generator, an input end of the pulse generator is connected with an output end of the exclusive or gate, and an output end of the pulse generator is connected with an output end of the automatic reset device.

Preferably, the pulse generator further comprises a differentiating circuit for generating the reset pulse signal according to a positive impulse response obtained by the differentiating circuit, and the pulse generator has an output pulse width of 1000 ms.

Drawings

Fig. 1 is a schematic diagram of a frame structure of a dual-power-supply-loop frequency converter system according to an embodiment of the present invention;

fig. 2 is a partially enlarged schematic view of an automatic reset of a frequency converter system according to the present invention;

fig. 3 is a schematic diagram of a frame structure of a frequency converter with dual power supply loops according to another embodiment of the present invention.

Description of the reference symbols

01. First power supply loop

02. Second power supply loop

03. Frequency converter group

04. Frequency converter

11. First switch

21. Second switch

30. Automatic resetting device

31. A first input terminal

32. A second input terminal

33. Reset output terminal

301. exclusive-OR gate

302. Pulse generator

3021. Differentiating circuit

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

Fig. 1 shows a block diagram of an architecture of a frequency converter system with dual supply loops. The frequency converter system comprises two power supply loops, namely a first power supply loop 01 and a second power supply loop 02, and further comprises a frequency converter group 03, an automatic restorer 30 and a control unit not shown in the figure. The frequency converter group 03 includes all frequency converters 04 used in the production line, four examples are shown in fig. 1, the first power supply loop 01 includes a first switch 11, the second power supply loop 02 includes a second switch 21, and the first switch 11 and the second switch 21 can respectively connect the first power supply loop 01 and the second power supply loop 02 to supply power to the frequency converter group 03, so that only one of the first switch 11 and the second switch 21 can be in a closed state in a control strategy in the control unit, otherwise, the whole system fails. The first switch 11 and the second switch 21 are respectively provided with an auxiliary contact, and each auxiliary contact outputs a high level signal when the first switch 11 or the second switch 21 connected with the auxiliary contact is switched on, and otherwise outputs a low level signal. The automatic reset device 30 includes a first input terminal 31, a second input terminal 32, and a reset output terminal 33, and is connected to the reset ports of the frequency converters 04 in the frequency converter group 03 through the reset output terminal 33, so as to output reset signals to the frequency converters 04 in the frequency converter group 03. Because each frequency converter 04 receives the reset signal sent uniformly, the reset and the reset can be carried out synchronously, even if each frequency converter 04 is in different working states before the power failure occurs, the reset time of each frequency converter 04 cannot be influenced, and therefore the whole frequency converter system can return to the working state most quickly after the process of switching the power supply loop.

As shown in fig. 2, the automatic reset device 30 of the present invention comprises an xor gate 301 and a pulse generator 302, wherein the output terminal of the xor gate 301 is connected to the input terminal of the pulse generator 302, and two input terminals of the xor gate 301 are respectively connected to the auxiliary contacts of the first switch 11 and the second switch 21, and the signals from the two auxiliary contacts are xored. The xor gate 301 outputs a high signal when one of the two auxiliary contacts outputs a high level and outputs a low level, and the xor gate 301 outputs a low signal if the two auxiliary contacts output a low level. The pulse generator 302 further comprises a differentiating circuit 3021, the differentiating circuit 3021 is directly connected to the input terminal of the pulse generator 302 and performs a differentiation calculation on the received signal, and each time the differentiating circuit 3021 generates a positive-going surge signal, the pulse generator 302 outputs a pulse signal as a reset signal for triggering the reset operation of each frequency converter in the frequency converter group 03. In this embodiment, as an example, the pulse width of the pulse signal is 1000 milliseconds, and in different application scenarios, pulse signals with different pulse widths can be output as reset signals according to different frequency converter reset requirements.

In the process of the frequency converter system of the present embodiment encountering the power supply loop fault to start the loop switching, for example, the first power supply loop 01 is powered off due to the fault, at which time the control unit controls the first switch 11 to be switched off, and then the second switch 21 is closed, so that the frequency converter system can obtain the power supply from the second power supply loop 02. Before the second switch 21 is closed, there is a time period that both the first switch 11 and the second switch 21 are in an open state, and at this time, both the auxiliary contact of the first switch and the auxiliary contact of the second switch 21 output a low-level signal, so that the output of the xor gate 301 is also a low-level signal; when the second switch 21 is closed, the auxiliary contact of the second switch 21 outputs a high level signal, and the xor gate 301 also outputs a high level signal, a signal step exists between the low level and the high level, the step signal passes through the differentiating circuit 3021, a positive impact signal is generated, according to the impact signal, the pulse generator 302 outputs a pulse signal with a pulse width of 1000 milliseconds, and the frequency converters 04 in all the frequency converter groups 03 simultaneously start the reset operation after receiving the pulse signal, so that the waiting time can be reduced to the maximum extent, and the operation can be resumed fastest under the power supply of the second power supply loop 02.

Fig. 3 shows another embodiment of the present invention, and the frequency converter with dual power supply loops comprises two power supply loops, namely a first power supply loop 01 and a second power supply loop 02, and further comprises an automatic reset device 30 and a control unit not shown in the figure. The first power supply loop 01 comprises a first switch 11, the second power supply loop 02 comprises a second switch 21, and the first switch 11 and the second switch 21 can respectively connect the power supply of the first power supply loop 01 and the second power supply loop 02 to the frequency converter group 03, so that only one of the first switch 11 and the second switch 21 can be in a closed state in a control strategy in the control unit, otherwise, the frequency converter fails. The first switch 11 and the second switch 21 are respectively provided with an auxiliary contact, and each auxiliary contact outputs a high level signal when the first switch 11 or the second switch 21 connected with the auxiliary contact is switched on, and otherwise outputs a low level signal. The automatic reset device 30 comprises a first input terminal 31 and a second input terminal 32, and further comprises a reset output terminal 33, and the reset output terminal 33 is connected to the reset port of the frequency converter to output a reset signal to the frequency converter, so that the frequency converter can automatically recover the working state after the process of switching the power supply circuit.

While the invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims. Furthermore, any reference signs in the claims shall not be construed as limiting the claim concerned. The word "comprising" does not exclude the presence of other devices or steps than those listed in a claim or the specification; the terms "first," "second," and the like are used merely to denote names, and do not denote any particular order. In this context, "parallel," "perpendicular," and the like are not strictly mathematical and/or geometric limitations, but also encompass tolerances as would be understood by one skilled in the art and permitted by fabrication or use.

Claims (8)

1. A frequency converter system with double power supply loops comprises a first power supply loop (01), a second power supply loop (02), a control unit and a frequency converter group (03), wherein the frequency converter group (03) comprises at least two frequency converters (04), the first power supply loop (01) comprises a first switch (11), the second power supply loop (02) comprises a second switch (21), the control unit controls at most one of the first switch (11) and the second switch (21) to be in a closed state,

the automatic reset device is characterized by further comprising an automatic reset device (30), wherein the automatic reset device (30) further comprises a first input end (31), a second input end (32) and a reset output end (33), the first input end (31) is connected with an auxiliary contact of the first switch (11), the second input end (32) is connected with an auxiliary contact of the second switch (21), and the reset output end (33) is connected with a reset port of the frequency converter (04).

2. Frequency converter system according to claim 1, characterized in that the automatic reset (30) has an exclusive or gate (301), both inputs of the exclusive or gate (301) being connected to the first input (31) and the second input (32), and a pulse generator (302), an input of the pulse generator (302) being connected to an output of the exclusive or gate (301), an output of the pulse generator (302) being connected to an output of the automatic reset (30).

3. Frequency converter system according to claim 2, characterized in that the pulse generator (302) further comprises a differentiating circuit (3021) for generating a reset pulse signal in dependence of the resulting positive impulse response of the differentiating circuit (3021).

4. A frequency converter system according to claim 3, characterized in that the pulse width of the output of the pulse generator (302) is 1000 milliseconds.

5. The frequency converter with the double power supply loops further comprises a first power supply loop (01), a second power supply loop (02) and a control unit, wherein the first power supply loop (01) comprises a first switch (11), the second power supply loop (02) comprises a second switch (21), the control unit controls at most one of the first switch (11) and the second switch (21) to be in a closed state,

the automatic reset device is characterized by further comprising an automatic reset device (30), wherein the automatic reset device (30) further comprises a first input end (31), a second input end (32) and a reset output end (33), the first input end (31) is connected with an auxiliary contact of the first switch (11), the second input end (32) is connected with an auxiliary contact of the second switch (21), and the reset output end (33) is connected with a reset port of the frequency converter (04).

6. Frequency converter according to claim 5, characterized in that the automatic reset (30) has an exclusive OR gate (301), two inputs of the exclusive OR gate (301) being connected to the first input (31) and the second input (32), and a pulse generator (302), an input of the pulse generator (302) being connected to an output of the exclusive OR gate (301), an output of the pulse generator (302) being connected to an output of the automatic reset (30).

7. The frequency converter according to claim 6, characterized in that the pulse generator (302) further comprises a differentiating circuit (3021) for generating the reset pulse signal in dependence of the resulting positive impulse response of the differentiating circuit (3021).

8. The frequency converter according to claim 7, wherein the pulse generator (302) has an output pulse width of 1000 milliseconds.

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