CN212114767U - Tripping circuit, control circuit and electric leakage detection system thereof - Google Patents
Tripping circuit, control circuit and electric leakage detection system thereof Download PDFInfo
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- CN212114767U CN212114767U CN202021125908.2U CN202021125908U CN212114767U CN 212114767 U CN212114767 U CN 212114767U CN 202021125908 U CN202021125908 U CN 202021125908U CN 212114767 U CN212114767 U CN 212114767U
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Abstract
The utility model provides a trip circuit, control circuit and electric leakage detection system thereof. The trip circuit further comprises a bias voltage unit, a coupling unit, a first switch unit and a second switch unit; the bias voltage unit pulls voltages at two ends of the bias voltage unit to be approximately equal when the second switch unit is turned off; when the second switch unit of the coupling unit is turned on, the voltage for turning off the first switch unit is generated by coupling; the first switching unit: the tripping coil is controlled by a first control signal and provides a direct current path for the tripping coil when being triggered; the second switching unit: and the first switch unit is controlled by a second control signal and is switched off through the coupling unit when the first switch unit is switched on. The utility model has the advantages of it is following: the silicon controlled rectifier can be turned off in the triggering process by applying the staggered control waveforms, and the stopping mechanism is triggered if the mechanism still cannot be tripped after a plurality of triggering waveforms are applied, so that the equipment is prevented from being exploded and further loss is avoided.
Description
Technical Field
The utility model relates to an electron field, concretely relates to trip circuit, control circuit and electric leakage detection system thereof.
Background
The leakage protection system is mainly used for protecting the electric shock of a person with fatal danger when a circuit device has leakage faults, has the functions of overload and short-circuit protection, and can be used for protecting the overload and short-circuit of a circuit.
At present, for a leakage protection system, especially for a rectification or direct current input leakage protection system, because a silicon controlled rectifier is used as a tripping driving core device, after leakage occurs, the silicon controlled rectifier is triggered, even if the silicon controlled rectifier stops triggering, the silicon controlled rectifier is always conducted because the silicon controlled rectifier is not effectively turned off, and if a mechanism fault (such as adhesion, rusting, impurity blockage and the like) occurs, a tripping coil is burnt or the silicon controlled rectifier is fried.
In order to solve the problem, the existing scheme is to use a high-voltage NMOS device, an IGBT device or a SiC device as a trip driving power device and match with digital square wave control to solve the problem, but the scheme has high cost, and after long-term operation, the devices such as the high-voltage NMOS device, the IGBT device or the SiC device can generate a strong miller effect and can not be turned off, so that the device is exploded.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems:
according to the utility model discloses an aspect, the utility model provides a trip circuit.
The concrete technical solution is as follows:
a trip circuit comprises a trip coil, a bias voltage unit, a coupling unit, a first switch unit and a second switch unit;
when current flows, the tripping coil drives the mechanical structure to trip;
the bias voltage unit pulls voltages at two ends of the bias voltage unit to be approximately equal when the second switch unit is turned off;
when the second switch unit of the coupling unit is turned on, the voltage for turning off the first switch unit is generated by coupling;
the first switching unit: the tripping coil is controlled by a first control signal and provides a direct current path for the tripping coil when being triggered;
the second switching unit: the first switch unit is controlled by a second control signal and is switched off through the coupling unit when the first switch unit is switched on;
preferably, one end of the trip coil is connected with the first voltage signal, and the other end of the trip coil is connected with the third voltage signal;
one end of the bias voltage unit is connected with the first voltage signal, and the other end of the bias voltage unit is connected with the fourth voltage signal:
one end of the first switch unit is connected with the third voltage signal, and the other end of the first switch unit is connected with the second voltage signal;
one end of the second switch unit is connected with the fourth voltage signal, and the other end of the second switch unit is connected with the second voltage signal;
the second level voltage signal is a ground signal.
The voltage of the first voltage signal is greater than the voltage of the second voltage signal.
Preferably, the first switching unit is a triggerable latch device.
Further preferably, the triggerable latch device is a thyristor or a thyristor.
Further preferably, the triggerable latch device is a single device or a cascade device.
Preferably, the second switching unit is a turn-off power device.
Further preferably, the turn-off power device is any one of MOS, BJT, IGBT, SiC, GaN or GTO.
Further preferably, the turn-off power device is a medium voltage power device.
Further preferably, the turn-off power device is a single device or a cascade device.
Preferably, the bias voltage unit is a resistor.
Preferably, the bias voltage unit is an inductor or an active device.
Preferably, the coupling unit is a capacitor.
Preferably, the coupling unit is an energy storage device or an active device.
According to the utility model discloses a second aspect, the utility model provides a trip circuit control method.
The concrete technical solution is as follows:
a trip circuit control method, a first control signal controls a first switch unit; the second control signal controls the second switch unit;
in a first control signal period, a first control signal sequentially outputs a first control level and a second control level;
in a second control signal period, the second control signal sequentially outputs a third control level and a fourth control level;
the second control signal starts outputting the third control level later than the first control signal starts outputting the first control level.
The first control level is used for triggering the first switch unit;
the second control level is used for stopping triggering the first switch unit;
the third control level is used for turning on the second switch unit;
the fourth control level is used for turning off the second switch unit;
the first control level and the second control level are opposite level signals;
the third control level and the fourth control level are opposite level signals.
Preferably, the time when the second control signal starts outputting the third control level is before the time when the first control signal starts outputting the second control level.
Preferably, the time when the second control signal starts outputting the third control level is after the time when the first control signal starts outputting the second control level.
Preferably, the time when the second control signal starts outputting the third control level is the same as the time when the first control signal starts outputting the second control level.
Preferably, the first control signal period is the same as the second control signal period.
Preferably, the time during which the first control signal outputs the first control level is 30 ms.
Preferably, the time for the first control signal to output the second control level is 100 ms.
Preferably, the time for the second control signal to output the third control level is 20 ms.
Preferably, the first control signal period and the second control signal each output four periods.
Preferably, the first control signal and the second control signal are any waveform signal of a square wave, a sine wave or a triangular wave.
Further preferably, when the first control signal and the second control signal are square wave signals;
the first control level and the third control level are high levels;
the second control level and the fourth control level are low levels.
It is further preferred that the first control level and the third control level are different in voltage.
Further preferably, the second control level and the fourth control level have different voltages.
According to the utility model discloses a third aspect, the utility model provides a trip circuit's control circuit.
The concrete technical solution is as follows:
the control circuit of the trip circuit comprises an amplifying circuit 22, a comparator 23, a first control signal generating unit 24 and a second control signal generating unit 25;
the leakage input signal is connected with the amplifying circuit 22 and the comparator 23 in sequence; the output of the comparator 23 is connected with the first control signal generating unit 24 and the second control signal generating unit 25;
the amplifier circuit 22 amplifies the leakage input signal;
the comparator 23 compares and detects the amplified leakage input signal;
the first control signal generating unit 24 generates a first control signal according to the output result of the comparator 23;
the second control signal generation unit 25 generates a second control signal according to the output result of the comparator 23.
Preferably, the control circuit of the trip circuit further comprises a filter 21;
the filter 21 is located between the leakage input signal and the amplification circuit 22;
the filter 21 filters noise of the leakage input signal.
According to the utility model discloses a fourth aspect, the utility model provides an electric leakage detection system.
The concrete technical solution is as follows:
a leakage detection system is composed of the trip circuit and a control circuit of the trip circuit;
the first level voltage signal is a direct current voltage;
the second level voltage signal is a ground signal;
the alternating current generates a leakage input signal through the current transformer, and the leakage input signal is input to the control circuit of the tripping circuit.
Preferably, the electric leakage detection system further comprises a power management module;
the output end of the power management module is connected with the control circuit of the tripping circuit and provides working power supply for the control circuit connected with the tripping circuit.
Further preferably, the power management module is an RC filter circuit.
Still further preferably, the RC filter circuit includes a resistor R3 and a capacitor C2;
one end of the resistor R3 is connected with the input end of the power management module, and the other end of the resistor R3 is connected with the output end of the power management module;
one end of the capacitor C2 is connected to the output end of the power management module, and the other end of the capacitor C2 is grounded.
According to the utility model discloses a fifth aspect, the utility model provides an electric leakage detection system.
The concrete technical solution is as follows:
the trip circuit is connected with the control circuit of the trip circuit;
the first level voltage signal is generated by the medium-voltage alternating current through the rectifying unit;
the second level voltage signal is a ground signal;
the medium-voltage alternating current generates a leakage input signal through the current transformer, and the leakage input signal is input to the control circuit of the tripping circuit.
Preferably, the electric leakage detection system further comprises a power management module;
the output end of the power management module is connected with the control circuit of the tripping circuit and provides working power supply for the control circuit connected with the tripping circuit.
Further preferably, the power management module is an RC filter circuit.
Still further preferably, the RC filter circuit includes a resistor R3 and a capacitor C2;
one end of the resistor R3 is connected with the input end of the power management module, and the other end of the resistor R3 is connected with the output end of the power management module;
one end of the capacitor C2 is connected to the output end of the power management module, and the other end of the capacitor C2 is grounded.
According to the utility model discloses a sixth aspect, the utility model provides an electric leakage detection system.
The concrete technical solution is as follows:
the trip circuit is connected with the control circuit of the trip circuit;
the first level voltage signal is generated by high-voltage alternating current through a rectifying unit;
the second level voltage signal is a ground signal;
the high-voltage alternating current generates a leakage input signal through the current transformer, and the leakage input signal is input to the control circuit of the tripping circuit.
Preferably, the electric leakage detection system further comprises a voltage division module; and the third voltage signal and the first switch unit are connected in series with a controlled silicon.
Further preferably, the thyristor is a medium voltage device.
Preferably, the electric leakage detection system further comprises a power management module;
the output end of the power management module is connected with the control circuit of the tripping circuit and provides working power supply for the control circuit connected with the tripping circuit.
Further preferably, the power management module is an RC filter circuit.
Still further preferably, the RC filter circuit includes a resistor R3 and a capacitor C2;
one end of the resistor R3 is connected with the input end of the power management module, and the other end of the resistor R3 is connected with the output end of the power management module;
one end of the capacitor C2 is connected to the output end of the power management module, and the other end of the capacitor C2 is grounded.
The utility model has the advantages of it is following:
the silicon controlled rectifier can be turned off in the triggering process by applying the staggered control waveforms, and the stopping mechanism is triggered if the mechanism still cannot be tripped after a plurality of triggering waveforms are applied, so that the equipment is prevented from being exploded and further loss is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of the tripping circuit of the present invention;
fig. 2 is a timing diagram of the trip circuit control of the present invention;
fig. 3 is a control circuit of the trip circuit of the present invention;
fig. 4 is a simulation working waveform diagram of the trip circuit of the present invention;
fig. 5 is the leakage detecting system of the utility model in the trip circuit dc mode;
fig. 6 is a leakage detecting system in the tripping circuit in the medium-voltage ac mode according to the present invention;
fig. 7 shows the leakage detecting system of the trip circuit in ac high voltage mode.
Detailed Description
The present invention will be described in more detail and fully with reference to the following examples and accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The principle of the utility model is that: when the generation of leakage current is detected, the first switch unit is controlled to be triggered (conducted) through the control signal, so that current flows through the trip coil, and the trip coil drives the mechanical structure to trip; then, the first switch unit stops triggering; the control signal controls the second switch unit to be conducted, and the voltage of the high-potential first pole (anode) of the first switch unit is reduced through the coupling action of the coupling unit, so that the first switch unit is safely disconnected. Therefore, the phenomenon that the tripping coil is burnt or the first switch unit is exploded due to the fact that the first switch unit is triggered and conducted all the time if a mechanism fails is avoided.
As shown in fig. 1, the trip circuit 1 of the present invention includes a trip coil 11, a bias voltage unit 14, a coupling unit 15, a first switching unit 12, and a second switching unit 13.
The trip coil 11 is used for driving the mechanical structure to trip when current flows;
the bias voltage unit 14 is used for pulling the voltages at two ends of the bias voltage unit 14 to be approximately equal when the second switch unit 12 is turned off; i.e. the voltages of the first level voltage signal and the fourth level voltage signal (VP3) are pulled to be nearly equal;
the coupling unit 15 is used for coupling to generate a voltage for turning off the first switch unit 12 when the second switch unit 13 is turned on;
the first switch unit 12 is controlled by a first control signal and provides a direct current path for the trip coil 11 when triggered;
the second switch unit 13 is controlled by a second control signal, and when the second switch unit is turned on, the first switch unit 12 is safely turned off through the coupling unit 15;
one end of the notch coil 11 is connected with a first level voltage signal, and the other end is connected with a third level voltage signal (VP 2); note that, here, the connection of the first level voltage signal to one end of the notch coil 11 means that the first level voltage signal is input to one end of the notch coil 11, and the following is similar.
The bias voltage unit 14 has one end connected to the first level voltage signal and the other end connected to the fourth level voltage signal (VP 3):
the first switch unit 12 has one end connected to the third level voltage signal (VP2) and the other end connected to the second level voltage signal.
One end of the second switch unit 13 is connected to the fourth level voltage signal (VP3), and the other end is connected to the second level voltage signal;
here: the voltage of the first level voltage signal is greater than the voltage of the second level voltage signal.
The voltage of the first level voltage signal is greater than that of the second level voltage signal, and it is known that the third level voltage signal (VP2) is greater than that of the second level voltage signal. Namely: the first switch unit 12 has one end connected to the third level voltage signal as a high potential pole or an anode.
The specific working process is as follows: when the generation of leakage current is detected, the first control signal enables the first switch unit to be triggered and conducted, and current flows through the trip coil. The tripping coil is an electromagnetic element, generates a magnetic field when current flows, drives the core to move to generate mechanical energy, and drives a mechanical structure to trip. Then, the second control signal controls to make the second switch unit conductive, and the voltage of the end of the first switch unit connected with the third level voltage signal (VP2) is reduced (namely, the high potential one pole or anode of the first switch unit 12) through the coupling action of the coupling unit, so that the first switch unit can be safely and reliably disconnected.
The first switching unit 12 is a triggerable latching device, in particular a thyristor or a thyristor. The triggerable latch device is a single device or a cascade device.
When the first switch unit 12 is a thyristor or a thyristor, the first control signal is connected to a gate of the thyristor or the thyristor for triggering. The third level voltage signal (VP2) is connected to the anode of the thyristor.
For the second switching unit 13 a turn-off power device. The turn-off power device can be any one of MOS, BJT, IGBT, SiC, GaN or GTO device. Likewise, the turn-off power device is a single device or a cascade device.
The second control signal is used for controlling the conducting state of the second switch unit 13, that is, when the second switch unit 13 is an MOS, the second control signal is connected to the gate of the MOS; when the second switch unit 13 is a BJT, the second control signal is connected to the base of the MOS. The second switching unit 13 is similarly connected for other devices.
The triggerable latch device and the turn-off power device are selected to be single devices or cascade devices according to conditions, and the cascade devices have the advantage of large bearable current and voltage.
What needs to be particularly noted here is: the turn-off power device is a medium voltage power device. The coupling unit can generate coupling voltage through the medium-voltage power device, so that the latch device can be triggered to be safely turned off, and meanwhile, the medium-voltage power device is small in power consumption and low in cost.
Typically, the coupling unit 15 is a capacitor. But energy storage devices, active devices, etc. may be selected based on different applications.
Typically, the bias voltage unit 14 is a resistor, and may be selected from an inductor, an active device, and the like according to different applications.
Different timing controls for the first switching unit 12 and the second switching unit 13 are also required for the trip circuit. Therefore, the utility model also provides a trip circuit control method.
The method specifically comprises the following steps:
the first control signal controls the first switch unit;
the second control signal controls the second switch unit;
in a first control signal period, the first control signal sequentially outputs a first control level; a second control level;
in the second control signal period, the second control signal sequentially outputs a third control level; a fourth control level;
the second control signal starts outputting the third control level later than the first control signal starts outputting the first control level.
The first control level is used for triggering the first switch unit;
the second control level is used for stopping triggering the first switch unit;
the third control level is used for turning on the second switch unit;
the fourth control level is used for turning off the second switch unit;
the first control level and the second control level are opposite level signals;
the third control level and the fourth control level are opposite level signals.
The first switch unit stops triggering, and the first switch unit is still in a conducting state. As before: after the thyristor is triggered, even if the thyristor stops triggering, because the thyristor is not effectively turned off, the thyristor will be always on and will be always on, and a series of problems will occur. Therefore, in order to safely turn off the first switch unit 12 after the trip coil is fully driven to trip the mechanical structure, there are several ways: the first method is as follows:
before the first switch unit stops triggering, the second switch unit is conducted, and the voltage of the third level voltage signal (VP2) is reduced through the coupling action of the coupling unit. Namely:
the second control signal starts outputting the third control level before the first control signal starts outputting the second control level.
The second method comprises the following steps:
after the first switch unit stops triggering, the second switch unit is conducted, and the voltage of the third level voltage signal (VP2) is reduced through the coupling action of the coupling unit. Namely:
the time when the second control signal starts outputting the third control level is after the time when the first control signal starts outputting the second control level.
The third method comprises the following steps:
the second switching unit is turned on while the first switching unit stops triggering, and the voltage of the third level voltage signal (VP2) is lowered by the coupling action of the coupling unit. Namely:
the time when the second control signal starts outputting the third control level is the same as the time when the first control signal starts outputting the second control level.
In particular, for ease of control, the first control signal period is the same as the second control signal period.
Meanwhile, in order to enable the trip circuit to stably control the trip coil to work, the first control signal period and the second control signal are respectively output for four periods.
For different application environments, the first control signal and the second control signal are any waveform signals of square waves, sine waves or triangular waves.
If: when the first control signal and the second control signal are square wave signals;
the first control level and the third control level are high levels;
the second control level and the fourth control level are low levels.
Since the first switching unit and the second switching unit may need to be in different operating states at different levels. For example: the first switch unit is triggered and the second switch unit is conducted under different high-level voltages; the first switch unit stops triggering and the second switch unit is turned off under different low-level voltages; the voltages of the first control level and the third control level are different; the second control level and the fourth control level are at different voltages.
The utility model relates to a trip circuit control method's embodiment one:
as fig. 2 the timing diagram of the trip circuit control of the present invention is shown: the waveform of the first control signal is above; the waveform of the second control signal is as follows. The waveform can be square wave, sine wave, triangle wave and other various waveforms for driving the silicon controlled rectifier and the MOS, and is only exemplified by the square wave.
P1 and P2 … … PN are the first period and the second period … … Nth period.
T1, T2, T3, T4 and T5 are different timings.
As can be seen from the figure:
at time T1, the first control signal outputs a high level (first control level), and the first switch unit is triggered at this time;
at time T2, the first control signal outputs a low level (second control level), and at this time, the first switch unit stops triggering;
at time T3, the second control signal outputs a high level (third control level), and the second switching unit is turned on;
at time T4, the second control signal outputs a low level (fourth control level), at which time the second switching unit is turned off;
at time T5, the next cycle starts, and the first control signal outputs high level (first control level) again.
It should be noted that:
the time difference between T1 and T2 is the triggering time of the first switch unit, the default is 30ms, and the triggering time can be adjusted according to different applications;
the time difference between T2 and T5 is the time for stopping triggering of the first switch unit, is default at 100ms, and can be adjusted according to different applications;
the time between T3 and T4 is 20ms as default when the second switch unit is turned on, and the turn-on time can be adjusted according to different applications;
the time difference between T2 and T3 may be positive, negative, or zero, and may be selected differently for different applications.
The period of the first switching unit is by default the same as the period of the second switching unit, but may be slightly adjusted for different applications; the number of cycles (number of pulses) of the first switch unit and the second switch unit can be selected differently according to different applications, and is defaulted to 4 pulse cycles.
The utility model discloses still provide a trip circuit's control circuit, like fig. 3 the utility model discloses trip circuit control circuit is shown, knows control circuit by the picture, including amplifier circuit 22, comparator 23, first control signal production unit 24 and second control signal production unit 25.
The leakage input signal is connected with the amplifying circuit 22 and the comparator 23 in sequence; the output of the comparator 23 is connected with the first control signal generating unit 24 and the second control signal generating unit 25;
the amplifier circuit 22 amplifies the leakage input signal;
the comparator 23 compares and detects the amplified leakage input signal;
the first control signal generating unit 24 generates a first control signal according to the output result of the comparator 23;
the second control signal generation unit 25 generates a second control signal according to the output result of the comparator 23.
In particular, in order to filter noise of the leakage input signal and make the amplifying circuit 22 work better, the control circuit further includes a filter 21; the filter 21 is located between the leakage input signal and the amplification circuit 22.
The leakage input signal comes from the sampling of the leakage protection system on the leakage network to be detected. The first control signal generating unit 24 and the second control signal generating unit 25 generate first control signals and second control signals for controlling the first switching unit 12 and the second switching unit 13 in the trip circuit.
Fig. 4 shows a simulation verification of the trip circuit, the control circuit of the trip circuit, and the control method thereof according to the present invention;
the first switch current (i.e., the current flowing through the first switch), the fourth level voltage signal (VP3), the third level voltage signal (VP2), and the control signal are sequentially arranged from top to bottom. It should be noted here that the control signal refers to the first control signal and the second control signal, which are shown in fig. 4 in combination, that is: a first control signal V (ods) and a second control signal V (odm). The first control signal is a gray waveform in the figure; the second control signal is a black waveform in the figure.
Here, the first control signal and the second control signal adopt the third mode:
the second switching unit is turned on while the first switching unit stops triggering, and the voltage of the third level voltage signal (VP2) is lowered by the coupling action of the coupling unit. Namely: the time when the second control signal starts outputting the third control level is the same as the time when the first control signal starts outputting the second control level.
Meanwhile, the voltage of the third control level is greater than the level of the first control.
As can be seen from the figure, when the third control level is output (the second switching unit is turned on), the voltage of the third level voltage signal (VP2) is lowered by the coupling unit. I.e. the spike at the downward instant in the figure. This will cause the first switching unit to stop triggering a safe switch-off.
The following describes the leakage detecting system using the trip circuit in detail through a specific embodiment.
The utility model discloses the embodiment one of the electric leakage detection system that application trip circuit and trip circuit's control circuit constitute:
application in DC mode:
fig. 5 shows the leakage detecting system of the trip circuit in dc mode of the present invention; the direct current mode refers to that the first level voltage signal of the connection tripping coil is a direct current signal. In the figure, the dedicated chip is the control circuit of the aforementioned trip circuit. The control circuit here is in the form of a chip. The first level voltage signal is a direct current voltage; the second level voltage signal is a Ground (GND) signal.
The first switch unit is a thyristor Q2, and the second switch unit is a MOS transistor Q1. The bias voltage unit is R1, and the coupling unit is C1. Which together with the trip coil constitute the aforementioned trip circuit.
In order to provide a suitable operating voltage for the control circuit (dedicated chip) of the trip circuit, a power management module 21 is also included in the figure. The first level signal is connected to an input terminal (not specifically shown) of the power management module 21, and an output terminal (not specifically shown) of the power management module 21 is connected to a control circuit of the trip circuit, so as to provide a working power supply for the control circuit of the trip circuit. The power management module 21 is an RC filter circuit. The power management module 21 comprises a resistor R3 and a capacitor C2; one end of the resistor R3 is connected with the input end of the power management module 21, and the other end of the resistor R3 is connected with the output end of the power management module 21; one end of the capacitor C2 is connected to the output end of the power management module 21, and the other end of the capacitor C2 is Grounded (GND).
Of course, the power management module 21 may be in other forms, and the RC filter circuit is only one of the simplest forms.
Alternating current (a line to be detected for electric leakage) generates an electric leakage input signal through the current transformer, and the electric leakage input signal is input to a control circuit of the tripping circuit, so that a first control signal and a second control signal are generated.
The utility model discloses the electric leakage detection system's that application trip circuit and trip circuit's control circuit constitute embodiment two:
application in medium voltage alternating current mode:
as shown in fig. 6, the difference between the leakage detecting system of the trip circuit of the present invention in the medium voltage ac mode and fig. 5 is that the first level voltage signal is generated by the medium voltage ac through the rectifying unit 22; the second level voltage signal is a Ground (GND) signal.
The utility model discloses the embodiment three of the electric leakage detection system that application trip circuit and trip circuit's control circuit constitute:
application in high-voltage alternating current mode:
as shown in fig. 7, the utility model discloses a leakage detection system under tripping circuit alternating current high voltage mode; as shown, the ac voltage is high, and may reach 380V or more.
The difference from fig. 6 is that the first level voltage signal is generated by the high voltage alternating current through the rectifying unit; the second level voltage signal is a ground signal.
Another difference from fig. 6 is that, in order to make the first switching unit be the thyristor Q2 capable of withstanding voltage well (the voltage of the first level signal generated by the rectifying unit 22 after passing through the trip coil, i.e. the aforementioned third voltage signal), the voltage dividing module 23 is added, and the voltage dividing module 23 is mainly implemented by connecting the thyristor Q3 in series between the third voltage signal and the first switching unit thyristor Q2. Of course, the voltage divider module 23 may further include other control devices, such as a resistor R2 and a diode D1 shown in fig. 7.
This has the advantage that the first level voltage signal generated by the high voltage alternating current can be borne by the medium voltage thyristor Q2 or the thyristor Q3. Compared with a high-voltage silicon controlled rectifier, the high-voltage silicon controlled rectifier is simple in implementation mode, low in cost and high in reliability.
The power management module 21 in fig. 6 and 7, which is the same as that in fig. 5, is an RC filter circuit, and they function in the same way.
Compared with the prior art the utility model has the advantages that use crisscross control waveform, trigger the in-process and can turn off the silicon controlled rectifier to if the mechanism still can't thread off triggers the stop gear behind a plurality of trigger waveforms, thereby prevent that equipment from exploding the machine and the bigger loss appears.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Claims (29)
1. A trip circuit comprising a trip coil, characterized in that:
the trip circuit further comprises a bias voltage unit, a coupling unit, a first switch unit and a second switch unit;
when current flows, the tripping coil drives the mechanical structure to trip;
when the second switch unit is turned off, the bias voltage unit pulls the voltages at the two ends of the bias voltage unit to be approximately equal;
when the second switch unit is switched on, the coupling unit is coupled to generate a voltage for switching off the first switch unit;
the first switching unit: the tripping coil is controlled by a first control signal and provides a direct current path for the tripping coil when being triggered;
the second switching unit: and the first switch unit is controlled by a second control signal and is switched off through the coupling unit when the first switch unit is switched on.
2. The trip circuit of claim 1, wherein:
one end of the trip coil is connected with the first voltage signal, and the other end of the trip coil is connected with the third voltage signal;
one end of the bias voltage unit is connected with the first voltage signal, and the other end of the bias voltage unit is connected with the fourth voltage signal:
one end of the first switch unit is connected with the third voltage signal, and the other end of the first switch unit is connected with the second voltage signal;
one end of the second switch unit is connected with the fourth voltage signal, and the other end of the second switch unit is connected with the second voltage signal;
the second level voltage signal is a ground signal.
3. The trip circuit of claim 1, wherein:
the first switching unit is a triggerable latch device.
4. The trip circuit of claim 3, wherein:
the triggerable latch device is a silicon controlled rectifier or a crystal valve tube.
5. The trip circuit of claim 3, wherein:
the triggerable latch device is a single device or a cascade device.
6. The trip circuit of claim 1, wherein:
the second switch unit is a turn-off power device.
7. The trip circuit of claim 6, wherein:
the turn-off power device is any one of MOS, BJT, IGBT, SiC, GaN or GTO device.
8. The trip circuit of claim 6, wherein:
the turn-off power device is a medium voltage power device.
9. The trip circuit of claim 6, wherein:
the turn-off power device is a single device or a cascade device.
10. The trip circuit of claim 1, wherein:
the bias voltage unit is a resistor.
11. The trip circuit of claim 1, wherein:
the bias voltage unit is an inductor or an active device.
12. The trip circuit of claim 1, wherein:
the coupling unit is a capacitor.
13. The trip circuit of claim 1, wherein:
the coupling unit is an energy storage device or an active device.
14. A control circuit of a trip circuit, characterized in that:
the control circuit of the tripping circuit comprises an amplifying circuit (22), a comparator (23), a first control signal generating unit (24) and a second control signal generating unit (25);
the leakage input signal is connected with an amplifying circuit (22) and a comparator (23) in sequence; the output of the comparator (23) is connected with a first control signal generating unit (24) and a second control signal generating unit (25);
an amplifying circuit (22) amplifies the leakage input signal;
the comparator (23) compares and detects the amplified leakage input signal;
a first control signal generating unit (24) generates a first control signal according to the output result of the comparator (23);
the second control signal generation unit (25) generates a second control signal according to the output result of the comparator (23).
15. The control circuit of a trip circuit of claim 14, wherein:
the control circuit of the trip circuit further comprises a filter (21);
the filter (21) is located between the leakage input signal and the amplification circuit (22);
the filter (21) filters noise of the leakage input signal.
16. An electrical leakage detection system, characterized by:
the trip circuit of any of claims 1-15 and a control circuit of the trip circuit;
the first level voltage signal is a direct current voltage;
the second level voltage signal is a ground signal;
the alternating current generates a leakage input signal through the current transformer, and the leakage input signal is input to the control circuit of the tripping circuit.
17. An electrical leakage detection system according to claim 16, wherein:
the electric leakage detection system also comprises a power supply management module;
the output end of the power management module is connected with the control circuit of the tripping circuit and provides working power supply for the control circuit connected with the tripping circuit.
18. An electrical leakage detection system according to claim 17, wherein:
the power management module is an RC filter circuit.
19. An electrical leakage detection system according to claim 18, wherein:
the RC filter circuit comprises a resistor R3 and a capacitor C2;
one end of the resistor R3 is connected with the input end of the power management module, and the other end of the resistor R3 is connected with the output end of the power management module;
one end of the capacitor C2 is connected to the output end of the power management module, and the other end of the capacitor C2 is grounded.
20. An electrical leakage detection system, characterized by:
the trip circuit of any of claims 1-15 and a control circuit of the trip circuit;
the first level voltage signal is generated by the medium-voltage alternating current through the rectifying unit;
the second level voltage signal is a ground signal;
the medium-voltage alternating current generates a leakage input signal through the current transformer, and the leakage input signal is input to the control circuit of the tripping circuit.
21. An electrical leakage detection system according to claim 20, wherein:
the electric leakage detection system also comprises a power supply management module;
the output end of the power management module is connected with the control circuit of the tripping circuit and provides working power supply for the control circuit connected with the tripping circuit.
22. An electrical leakage detection system according to claim 21, wherein:
the power management module is an RC filter circuit.
23. An electrical leakage detection system according to claim 22, wherein:
the RC filter circuit comprises a resistor R3 and a capacitor C2;
one end of the resistor R3 is connected with the input end of the power management module, and the other end of the resistor R3 is connected with the output end of the power management module;
one end of the capacitor C2 is connected to the output end of the power management module, and the other end of the capacitor C2 is grounded.
24. An electrical leakage detection system, characterized by:
the trip circuit of any of claims 1-15 and a control circuit of the trip circuit;
the first level voltage signal is generated by high-voltage alternating current through a rectifying unit;
the second level voltage signal is a ground signal;
the high-voltage alternating current generates a leakage input signal through the current transformer, and the leakage input signal is input to the control circuit of the tripping circuit.
25. An electrical leakage detection system according to claim 24, wherein:
the electric leakage detection system also comprises a voltage division module; the voltage division module is realized by connecting a silicon controlled rectifier in series between the third voltage signal and the first switch unit.
26. An electrical leakage detection system according to claim 25, wherein:
the controllable silicon is a medium-voltage device.
27. An electrical leakage detection system according to any of claims 24-26, wherein:
the electric leakage detection system also comprises a power supply management module;
the output end of the power management module is connected with the control circuit of the tripping circuit and provides working power supply for the control circuit connected with the tripping circuit.
28. An electrical leakage detection system according to claim 27, wherein:
the power management module is an RC filter circuit.
29. An electrical leakage detection system according to claim 28, wherein:
the RC filter circuit comprises a resistor R3 and a capacitor C2;
one end of the resistor R3 is connected with the input end of the power management module, and the other end of the resistor R3 is connected with the output end of the power management module;
one end of the capacitor C2 is connected to the output end of the power management module, and the other end of the capacitor C2 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021125908.2U CN212114767U (en) | 2020-06-17 | 2020-06-17 | Tripping circuit, control circuit and electric leakage detection system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021125908.2U CN212114767U (en) | 2020-06-17 | 2020-06-17 | Tripping circuit, control circuit and electric leakage detection system thereof |
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| CN212114767U true CN212114767U (en) | 2020-12-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585248A (en) * | 2020-06-17 | 2020-08-25 | 西安国矽微半导体有限公司 | Tripping circuit, method, control circuit and electric leakage detection system thereof |
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- 2020-06-17 CN CN202021125908.2U patent/CN212114767U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585248A (en) * | 2020-06-17 | 2020-08-25 | 西安国矽微半导体有限公司 | Tripping circuit, method, control circuit and electric leakage detection system thereof |
| CN111585248B (en) * | 2020-06-17 | 2022-03-18 | 西安国矽微半导体有限公司 | Tripping circuit, method, control circuit and electric leakage detection system thereof |
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