CN218040776U

CN218040776U - Thyristor switching controller with open-phase protection function

Info

Publication number: CN218040776U
Application number: CN202222059009.2U
Authority: CN
Inventors: 樊书鑫; 戴晨
Original assignee: JIANGSU MODUN ELECTRIC CO Ltd
Current assignee: JIANGSU MODUN ELECTRIC CO Ltd
Priority date: 2022-08-05
Filing date: 2022-08-05
Publication date: 2022-12-13
Anticipated expiration: 2032-08-05

Abstract

The utility model discloses a thyristor switching controller that possesses default phase protect function, including default phase detecting element, trigger logic unit, thyristor drive unit and fan drive unit, default phase detecting element's output and the input electric connection who triggers logic unit, trigger logic unit's output respectively with thyristor drive unit and fan drive unit's input electric connection. The utility model completely depends on the analog circuit, does not depend on the program control of a single chip microcomputer, adopts the control logics which mutually influence and restrict each other to realize the functions of open-phase protection and the like, not only achieves the purpose of open-phase protection, but also reduces the cost and the process procedures; this controller is through converting the looks line voltage into direct current high pressure, and the rethread opto-coupler converts direct current high pressure into corresponding current signal, and at this conversion in-process, it is withstand voltage to have produced the electrical isolation of an at least 3750V for the controller is safer, is difficult for taking place accident such as electric leakage.

Description

Thyristor switching controller with open-phase protection function

Technical Field

The utility model relates to a cut open controller technical field, specifically be for possessing default phase protect function's thyristor switching controller.

Background

The application of the fling-cut switch in the power grid is very common, the main part of the fling-cut switch during working is a fling-cut switch controller, the fling-cut switch controller is equivalent to the brain of the fling-cut switch, for a zero-crossing fling-cut switch, the controller needs to detect zero-crossing current or zero-crossing voltage in a circuit and needs to accurately send an opening or closing instruction to the fling-cut switch, and therefore, whether the fling-cut switch works or not is usually judged by observing the state of an indicator light of the controller.

The existing thyristor switching and breaking controller has the advantages that one part of the existing thyristor switching and breaking controller completely adopts a hardware circuit to realize the switching function, and the other part of the existing thyristor switching and breaking controller needs to rely on a single chip microcomputer program to control to realize the function. The former generally is difficult to accomplish perfect fault detection and protect function, and the latter can realize many protect function but the cost is higher, and the interference killing feature is weak, and production and later maintenance are comparatively troublesome. Especially, the phase-loss protection function is difficult to be achieved by completely adopting a switch of a hardware circuit, and although the switch which is controlled by the singlechip program can realize phase-loss detection and alarm through sampling judgment of voltage, the switch greatly occupies the operation resource of the singlechip in an embedded system, so that the performance requirement of a developer on the singlechip is improved, and the cost is indirectly increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a thyristor switching controller who possesses default phase protect function to solve the problem that proposes in the above-mentioned background art.

In order to solve the technical problem, the utility model provides a following technical scheme: the thyristor switching controller with the open-phase protection function comprises an open-phase detection unit, a trigger logic unit, a thyristor driving unit and a fan driving unit, wherein the output end of the open-phase detection unit is electrically connected with the input end of the trigger logic unit, and the output end of the trigger logic unit is electrically connected with the input ends of the thyristor driving unit and the fan driving unit respectively.

Furthermore, the open-phase detection unit comprises three rectifying circuits, each rectifying circuit comprises an open-phase protection transistor, an electrolytic capacitor, a first resistor and a second resistor, the open-phase protection transistor is connected with the electrolytic capacitor in series, the electrolytic capacitor is connected with the first resistor in series, and the first resistor is connected with the second resistor in parallel.

Further, the open-phase protection transistor comprises a transistor D3, a transistor D7 and a transistor D11, the electrolytic capacitor comprises an electrolytic capacitor C2, an electrolytic capacitor C4 and an electrolytic capacitor C6, the first resistor comprises a resistor R7, a resistor R18 and a resistor R29, and the second resistor comprises a resistor R9, a resistor R20 and a resistor R31.

Further, the trigger logic unit comprises an on-off transistor Q2, an on-off transistor Q4 and an on-off transistor Q6, the on-off transistor Q2, the on-off transistor Q4 and the on-off transistor Q6 are sequentially connected in series, a pin 1 of the on-off transistor Q2 is connected in series with a resistor R7, a pin 2 of the on-off transistor Q2 is connected in series with a resistor R9, a pin 1 of the on-off transistor Q4 is connected in series with a resistor R8, a pin 2 of the on-off transistor Q4 is connected in series with a resistor R20, a pin 1 of the on-off transistor Q6 is connected in series with a resistor R29, a pin 2 of the on-off transistor Q6 is connected in series with a resistor R31, the on-off transistor Q2 is connected with a triode Q1, and the on-off transistor Q6 is connected with a diode D120, a diode D121 and a diode D122.

Further, the thyristor driving unit comprises a plurality of photothyristors which are connected in series to drive an external thyristor, and the photothyristors drive the external thyristor and are electrically connected with the triode Q1.

Further, the fan driving unit includes an optical solid state relay U7, a diode D123, a diode D124 and a diode D125 are connected to a pin 3 of the optical solid state relay U7, the diode D123 is connected to the diode D120 through an a-pin, the diode D124 is connected to the diode D121 through a B-pin, and the diode D125 is connected to the diode D122 through a C-pin.

Compared with the prior art, the utility model discloses the beneficial effect who reaches is:

1. the utility model discloses rely on analog circuit completely, not with the help of singlechip program control, adopt the control logic who restricts each other to realize lacking functions such as looks protection, both reached the purpose of lacking looks protection, again the cost is reduced and technology process has reduced the purchase risk, this controller circuit board production can directly install the test after rolling off the production line, need not other processes such as burning record.

2. The utility model discloses a convert the looks line voltage into direct current high pressure, the rethread opto-coupler converts direct current high pressure into corresponding current signal, and at this conversion in-process, it is withstand voltage to have produced an at least 3750V's electrical isolation, and such design makes the controller safer, is difficult for taking place accident such as electric leakage.

3. The utility model discloses the analog circuit who adopts, do not adopt any digital circuit chip or analog circuit chip that needs low-voltage DC power supply, do not acquire the electric energy from alternating current network, but several milliamperes's of ingenious utilization outside trigger signal transmission weak undercurrent realize the function, when outside trigger signal closes, controller analog circuit is the shutdown thereupon also, system stand-by power consumption equals 0, and singlechip program control's controller all inevitable can produce stand-by power consumption problem, therefore, extension circuit board life that this controller can be very big, save the electric energy, reduce controller fault rate, the function operation is more reliable and more stable.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a flow chart of the overall unit connection of the present invention;

FIG. 2 is an overall circuit topology of the present invention;

FIG. 3 is a schematic diagram of the overall complementary circuit of the present invention;

fig. 4 is a schematic diagram of the overall complementary circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: the thyristor switching controller with the open-phase protection function comprises an open-phase detection unit, a trigger logic unit, a thyristor driving unit and a fan driving unit, wherein the output end of the open-phase detection unit is electrically connected with the input end of the trigger logic unit, the output end of the trigger logic unit is respectively electrically connected with the input ends of the thyristor driving unit and the fan driving unit, the open-phase detection unit comprises three rectifying circuits, each rectifying circuit comprises an open-phase protection transistor, an electrolytic capacitor, a resistor I and a resistor II, the open-phase protection transistor is connected with the electrolytic capacitor in series, the electrolytic capacitor is connected with the resistor I in series, the resistor I is connected with the resistor II in parallel, the open-phase protection transistor comprises a transistor D3, a transistor D7 and a transistor D11, and the electrolytic capacitor comprises an electrolytic capacitor C2, an electrolytic capacitor C4 and an electrolytic capacitor C6, the trigger logic unit comprises an on-off transistor Q2, an on-off transistor Q4 and an on-off transistor Q6, the on-off transistor Q2, the on-off transistor Q4 and the on-off transistor Q6 are sequentially connected in series, a pin 1 of the on-off transistor Q2 is connected in series with the resistor R7, a pin 2 of the on-off transistor Q2 is connected in series with the resistor R9, a pin 1 of the on-off transistor Q4 is connected in series with the resistor R8, a pin 2 of the on-off transistor Q4 is connected in series with the resistor R20, a pin 1 of the on-off transistor Q6 is connected in series with the resistor R29, a pin 2 of the on-off transistor Q6 is connected in series with the resistor R31, the on-off transistor Q2 is connected with a triode Q1, the on-off transistor Q6 is connected with a diode D120, the thyristor driving unit comprises a plurality of photothyristors in polar connection to drive an external thyristor, the photothyristors drive the external thyristor to be electrically connected with the triode Q1, the fan driving unit comprises a light solid state relay U7, a pin 3 of the light solid state relay U7 is connected with a diode D123, a diode D124 and a diode D125, the diode D123 is connected with the diode D120 through an A-pin, the diode D124 is connected with the diode D121 through a B-pin, and the diode D125 is connected with the diode D122 through a C-pin.

The specific implementation mode is as follows: the controller does not adopt a singlechip or other similar microprocessors, and completely realizes the open-phase protection function and the basic thyristor switching function through discrete semiconductor components (analog circuits); the controller consists of a thyristor driving unit, a trigger logic unit, a phase failure detection unit and a fan driving unit; the open-phase detection unit automatically judges open-phase faults by means of a hardware circuit and transmits fault signals to the trigger logic unit, even if the trigger signals are input outside the controller, logic detection cannot pass due to the existence of the open-phase faults, and external signals cannot enable the thyristor drive unit and the fan drive unit;

the open-phase detection unit of the controller converts the relative N line voltages of L1, L2 and L3 in the three-phase power grid into direct current voltages through the rectification circuit, and takes the fluctuation range parameters of the power grid voltage into consideration to obtain the direct current voltage value under the normal condition; when the three-phase power has a phase-loss fault, the voltage of the corresponding phase line to the N line is changed, and the rectified direct-current voltage is lower than the voltage value under the normal condition; once the direct-current voltage is lower than a normal value, a phase-lacking protection transistor in an internal circuit cannot be conducted, so that an external trigger signal cannot be effectively transmitted through the transistor;

the trigger logic unit of the controller sequentially judges whether the on-off transistors corresponding to the three phases are conducted, and when and only when the three transistors are conducted simultaneously, namely after no open-phase fault exists, once an effective trigger signal is output from the outside, the signal can be transmitted to a rear-stage driving unit through the open-phase protection transistor;

the thyristor driving unit of the controller adopts a plurality of cascaded photothyristors to drive an external thyristor; by cascading a plurality of photothyristors and sequentially driving each photothyristor by a driving signal, the voltage resistance and the anti-harmonic interference capability of a system can be effectively improved;

the fan driving unit of the controller drives the external alternating-current cooling fan by adopting the optical solid-state relay, and effective external trigger signals can drive the cooling fan at the same time when driving the thyristor, so that the rotation of the fan when the thyristor is switched and the stop of the fan when the thyristor is switched are realized, the service life of the fan is prolonged, and the electric energy loss is reduced;

the letters in fig. 2 represent the following:

a: L1-N, L2-N, L3-N three rectification circuits;

b: judging a voltage range, converting the voltage range into current driving capability to realize the on-off of the transistor;

c: three phases of the transistors are correspondingly switched on and off, and optical coupling isolation is adopted;

d: the open-phase protection transistor adopts a PNP type or a PMOS;

e: cascaded photothyristors;

f: an optical solid state relay.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Possess the thyristor switching controller of open-phase protect function, its characterized in that: the phase-failure detection circuit comprises a phase-failure detection unit, a trigger logic unit, a thyristor drive unit and a fan drive unit, wherein the output end of the phase-failure detection unit is electrically connected with the input end of the trigger logic unit, and the output end of the trigger logic unit is electrically connected with the input ends of the thyristor drive unit and the fan drive unit respectively.

2. The thyristor switched controller with the open-phase protection function according to claim 1, wherein: the open-phase detection unit comprises three rectifying circuits, each rectifying circuit comprises an open-phase protection transistor, an electrolytic capacitor, a resistor I and a resistor II, the open-phase protection transistor is connected with the electrolytic capacitor in series, the electrolytic capacitor is connected with the resistor I in series, and the resistor I is connected with the resistor II in parallel.

3. The thyristor switching controller with the open-phase protection function according to claim 2, wherein: the open-phase protection transistor comprises a transistor D3, a transistor D7 and a transistor D11, the electrolytic capacitor comprises an electrolytic capacitor C2, an electrolytic capacitor C4 and an electrolytic capacitor C6, the first resistor comprises a resistor R7, a resistor R18 and a resistor R29, and the second resistor comprises a resistor R9, a resistor R20 and a resistor R31.

4. The thyristor switching controller with the open-phase protection function according to claim 3, wherein: the trigger logic unit comprises an on-off transistor Q2, an on-off transistor Q4 and an on-off transistor Q6, the on-off transistor Q2, the on-off transistor Q4 and the on-off transistor Q6 are sequentially connected in series, a pin 1 of the on-off transistor Q2 is connected in series with a resistor R7, a pin 2 of the on-off transistor Q2 is connected in series with a resistor R9, a pin 1 of the on-off transistor Q4 is connected in series with a resistor R8, a pin 2 of the on-off transistor Q4 is connected in series with a resistor R20, a pin 1 of the on-off transistor Q6 is connected in series with a resistor R29, a pin 2 of the on-off transistor Q6 is connected in series with a resistor R31, the on-off transistor Q2 is connected with a triode Q1, and the on-off transistor Q6 is connected with a diode D120, a diode D121 and a diode D122.

5. The thyristor switched controller with the open-phase protection function according to claim 4, wherein: the thyristor driving unit comprises a plurality of photothyristors with polar connection to drive an external thyristor, and the photothyristors drive the external thyristor and are electrically connected with the triode Q1.

6. The thyristor switched controller with the open-phase protection function according to claim 4, wherein: the fan driving unit comprises an optical solid state relay U7, a diode D123, a diode D124 and a diode D125 are connected to a pin 3 of the optical solid state relay U7, the diode D123 is connected with the diode D120 through an A-pin, the diode D124 is connected with the diode D121 through a B-pin, and the diode D125 is connected with the diode D122 through a C-pin.