CN215527661U

CN215527661U - Multi-coil shunt release

Info

Publication number: CN215527661U
Application number: CN202121866117.XU
Authority: CN
Inventors: 周超; 葛纹懿
Original assignee: Jiangyin Yihong Electric Co Ltd
Current assignee: Jiangyin Yihong Electric Co Ltd
Priority date: 2021-08-10
Filing date: 2021-08-10
Publication date: 2022-01-14
Anticipated expiration: 2031-08-10

Abstract

The utility model discloses a multi-coil shunt release, which comprises an electromagnet with a multi-coil structure and comprising a starting winding, a maintaining winding and a choking winding. The power input end of the EMC filter circuit is connected with a power grid, the output end of the EMC filter circuit is connected with the input end of the rectifier circuit, the output end of the full-bridge rectifier circuit is respectively connected with the common end of the double coils of the electromagnet, and the input end of the voltage reduction circuit, the output end of the voltage reduction circuit is connected with the power circuit and the comparison circuit, the power circuit supplies power to the comparison circuit, the first switch circuit and the second switch circuit, the output end of the comparison circuit is connected with the first switch circuit and the input end of the differential circuit, the first switch circuit is connected with the maintaining winding, the output end of the differential circuit is connected with the switch power supply 2, and the second switch circuit is connected with the driving winding. The shunt release of the utility model has the advantages of simple circuit structure, strong anti-interference capability, locking function, simple current and the like.

Description

Multi-coil shunt release

Technical Field

The utility model relates to the field of low-voltage electrical appliances, in particular to a multi-coil shunt release.

Background

The shunt release is an accessory element for remotely operating the opening of a circuit breaker, according to GB14148.1-2008 "general rules for low-voltage switchgear and control devices" and GB 14048.2-2012 "part 2 of low-voltage switchgear and control devices: circuit breaker specifies that the shunt release should trip to open the electrical appliance under all operating conditions of the electrical appliance when the supply voltage of the shunt release (measured during the tripping action) remains between 70% and 110% of the nominal grid voltage. However, most of the existing shunt release devices are of a single-acting type, after power is supplied, the movable iron core pops out to realize switching-off and then returns quickly, so that possibility of reclosing caused by misoperation and the like is provided, and safety is affected.

The ideal shunt process is that after power is on, the moving iron core of the shunt release pops up and keeps the popping position, the lock is stopped until the remote control instruction is removed (the shunt release is power off), thus effectively avoiding reclosing,

the existing shunt release is a simple type in which a button or an auxiliary contact directly controls the action of a shunt electromagnet, a shunt release capable of being electrified for a long time, and a movable iron core is also of an instant type; the three types are CN201510126484.9 (a double-coil shunt release), which has a locking function, but the circuit structure is complex, and harmonic waves are easy to produce to pollute the power grid in a conduction mode.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides the multi-coil shunt release which keeps a shunt state, avoids reclosing, has a simple circuit and does not produce harmonic waves.

The purpose of the utility model is realized by the following technical scheme.

A multi-coil shunt release comprises an EMC filter circuit, a rectifying circuit, a voltage reduction circuit, a comparison circuit, a first switch circuit, a power supply circuit, a differential circuit, a second switch circuit and an electromagnet, wherein the electromagnet comprises a starting winding, a maintaining winding and a choke winding; the power input end of the EMC filter circuit is connected with a power grid, the output end of the EMC filter circuit is connected with the input end of the rectifier circuit, the output end of the rectifier circuit is respectively connected with the public end of the double coils of the electromagnet and the input end of the voltage reduction circuit, the output end of the voltage reduction circuit is connected with the power circuit and the comparison circuit, the power circuit supplies power to the comparison circuit, the first switch circuit and the second switch circuit, the output end of the comparison circuit is connected with the first switch circuit and the input end of the differential circuit, the first switch circuit is connected with the maintaining winding, the output end of the differential circuit is connected with the switch power supply 2, and the second switch circuit is connected with the starting winding.

The choke winding is used for restraining surge current, the starting winding is used for powerfully starting the electromagnet, and the maintaining winding is used for keeping the position of the movable iron core after starting.

And an inductance component of the EMC circuit is a group of coil windings inside the electromagnet.

The rectifier circuit is a discrete component or a component in the form of a full bridge, and rectifies an alternating current voltage into a pulsating direct current voltage.

The pulsating direct current voltage output by the rectifying circuit is reduced by a voltage reducing circuit in advance, and then is respectively supplied to a power supply circuit and a comparison circuit.

The comparison circuit adopts a micro-power consumption device.

The first switch circuit and the second switch circuit are circuits formed by power MOS tubes or SCR or triode circuits.

Compared with the prior art, the utility model has the advantages that:

1. the multi-winding electromagnet is adopted, under the condition that shunt tripping is met and the action voltage is met, the maintaining winding acts in advance, the electromagnet is provided to maintain a magnetic field (but not enough to drive the movable iron core), the starting winding provides larger current, and the movable iron core is forced to start to move to the bottom. The working time of the starting winding is tens of milliseconds, and the two windings are organically combined, so that the quick implementation of shunt action is ensured, the movable iron core is kept at the locking position in an extremely low power consumption mode, and reclosing is effectively prevented.

2. The impedance of the maintaining winding is large, the flowing current is small, even if a high terminal voltage is loaded, the phenomena of heating and the like can not be caused, the terminal voltage is not required to be regulated by PWM and other control means, the static working mode is adopted, and therefore harmonic waves can not be generated.

3. The choking winding arranged in the electromagnet is wound on the iron core, has large inductance and strong anti-saturation capacity, can resist external surge pulse and can inhibit surge current generated when the internal starting winding is switched on and off.

4. And a micro-power consumption device is used as a comparator, so that the load of a power circuit is greatly reduced.

5. Fully simplify circuit structure, reduce components and parts quantity, reduce whole manufacturing cost.

In conclusion, the utility model has the characteristics of locking, large starting torque, reliable locking, simple circuit and strong anti-interference capability.

Drawings

Fig. 1 is a schematic diagram of a circuit block according to the present invention.

Figure 2 is a circuit schematic of an embodiment of the present invention.

Figure 3 is a schematic diagram of multiple coils in accordance with an embodiment of the present invention.

Detailed Description

The utility model is described in detail below with reference to the drawings and specific examples.

As shown in fig. 1, a multi-coil shunt release includes an EMC filter circuit, a rectifier circuit, a step-down circuit, a comparator circuit, a first switch circuit, a power supply circuit, a differential circuit, a second switch circuit, and an electromagnet of a multi-coil structure including a start winding, a holding winding, and a choke winding. EMC filter circuit's power input end links to each other with the electric wire netting, EMC filter circuit's output link to each other with rectifier circuit's input, full-bridge rectifier circuit output links to each other with the common terminal of the twin coil of electro-magnet, step down circuit's input and power supply circuit, comparator circuit's output link to each other, power supply circuit for comparator circuit, first switch circuit and second switch circuit power supply, comparator circuit's output link to each other with first switch circuit, link to each other with the differential circuit input, first switch circuit with maintain the winding and link to each other, differential circuit's output and switching power supply 2 link to each other, second switch circuit and drive winding link to each other. The full-bridge rectification circuit rectifies alternating-current voltage into direct-current pulsating voltage, supplies power to the electromagnet starting winding and the maintaining winding, simultaneously supplies power to the voltage reduction circuit, the voltage reduced by the voltage reduction circuit is used by a power supply circuit and is used as output comparison voltage of the comparison circuit, the comparison circuit is a hysteresis type comparator and is used for identifying the voltage value of a power grid and making corresponding overturning action, the output end of the comparison circuit is controlled by a first switch circuit to switch on and off the maintaining winding, if the voltage value of the power grid is greater than a certain value, the output end of the comparison circuit 1 outputs high level, the first switch circuit is used for controlling the maintaining winding to be switched on, if the voltage value of the power grid is less than a certain value, the output end of the comparison circuit 1 outputs low level, the first switch circuit is used for controlling the maintaining winding to be switched off, the output end of the comparison circuit 1 is connected with a differential circuit, and the differential circuit converts a high level signal into a gradual-change signal which is reduced according to an exponential law, at the moment when the comparison circuit 1 outputs a high level, the second switch circuit outputs a high level, and when the gradual change signal output by the differential circuit is lower than the comparison value of the second switch circuit, the second switch circuit is inverted to a low level, and the start winding is closed.

The filter circuit is an EMC filter circuit, the input end of the EMC filter circuit is connected to the voltage of a power grid, the output end of the EMC filter circuit is connected to the rectifying circuit, and the EMC filter circuit can be in various forms such as L-type filter circuit and pi-type filter circuit.

The rectifying circuit is a full-bridge rectifying circuit, the input end of the rectifying circuit is connected to the output end of the EMC filtering circuit, one output end of the rectifying circuit is positive (+), and the other output end of the rectifying circuit is negative (+), and the reference ground is obtained.

The electromagnet with the multi-coil structure comprises a choke winding for inhibiting surge current, a starting winding for powerfully starting the electromagnet and a maintaining winding for maintaining the position of the movable iron core after starting.

The inductive component of the EMC circuit comes from a set of coil windings inside the electromagnet.

The rectifier circuit may be a discrete component, a full-bridge component, or the like, and rectifies an ac voltage into a pulsating dc voltage or the like.

The pulsating DC voltage output from the rectifying circuit is first reduced in part by the voltage reducing circuit and then supplied to the power supply circuit and the comparator circuit.

The comparison circuit adopts micro-power consumption devices such as a double operational amplifier, a double voltage comparator and the like, and reduces the load of the power supply circuit in a mode of extremely little current consumption.

The switch circuit can be a MOS tube driving circuit and a MOS tube which are formed by combining discrete components, or an SCR driving circuit and an SCR device, or a driving circuit which is constructed by a special driving chip.

The power supply circuit and the price comparing circuit 1 are connected to the voltage reducing circuit, and the number of components is reduced to the maximum length.

Alternatively, the network voltage signal is sampled by the comparison circuit for comparison, and the comparison circuit outputs a high level when the network voltage signal is higher than 70% of the rated value and outputs a low level when the network voltage signal is lower than 30% of the rated value.

In fig. 2, an EMC filter circuit is formed by a piezoresistor RV1, a capacitor CL1 and an inductance winding L1 from the inside of the electromagnet, and is used for bidirectionally suppressing interference from the power grid and interference from the internal circuit. The full-bridge rectifier BG1 constitutes a full-wave rectifier circuit, which rectifies an input voltage into a dc pulsating voltage, and the + output terminal of the rectifier circuit is defined as VH and the-output terminal of the rectifier circuit is defined as Ground (GND).

VH is isolated by a diode D1, a voltage reduction circuit is formed by R1 to form voltage VP, the voltage VP is limited by a resistor R6, a voltage regulator tube Z1 is used for voltage stabilization, a capacitor C1 is used for filtering to form a power supply circuit, 10V voltage is output to provide working voltage for a comparator circuit, the 10V voltage is stabilized by a current-limiting voltage regulator tube Z2 of a resistor R7 to obtain 5V reference voltage, and reference voltage is provided for the comparator circuit and a second switch circuit.

The voltage of VP is divided by resistors R2 and R3, and filtered by a capacitor C1 to form a voltage value SA, wherein the voltage value SA is used as a signal voltage representing the voltage of the power grid to be supplied to the non-inverting input end of the comparison circuit U1A, if the input voltage value is higher than 70% of a rated value, SA is larger than the voltage of the negative end of U1A, U1A overturns and outputs VO to be high level, and the MOS transistor Q2 is driven to be conducted to maintain the winding to be electrified and operated. The high level of VO drives the SA voltage value up through a feedback resistor R5 and a front resistor R4 on the one hand, realizes hysteresis comparison, and outputs the high level of VO to a differentiating circuit on the other hand.

The capacitor C3, the resistor R8 and the comparator U1B form a differential circuit, when VO is at a high level, because the voltage at two ends of the capacitor can not change suddenly, the voltage value VC at the R8 is at a high level instantly, the high level is larger than the voltage value at the negative end of the U1B, the U1B outputs a high level, so that the MOS transistor Q1 is conducted, and the start winding starts to work. And when the voltage value of VC is exponentially attenuated and is smaller than the voltage value of the negative terminal of U1B, U1B outputs low level, Q1 is turned off, and the start winding finishes working. Diode D3 provides a discharge path for C3 when U1A flips low.

When the voltage value of the power grid is lower than a certain value, such as the voltage value of the power grid is lower than the rated voltage value of 30%, SA is reduced to be lower than the voltage value of the negative end of U1A, U1A is turned to be low level, Q2 is turned off, the winding is maintained to stop working, and the movable iron core returns.

In fig. 3, a schematic diagram of 3 sets of coils are wound on the internal coil framework of the electromagnet. The coil winding is a choke coil winding, the starting coil winding, the maintaining coil winding, the ends with the same name, the Q1 in the figure 2, the Q2 in the figure 2, and the L1 in the figure 2.

Claims

1. A multi-coil shunt release is characterized in that: the electromagnetic energy-saving control circuit comprises an EMC filter circuit, a rectifying circuit, a voltage reduction circuit, a comparison circuit, a first switch circuit, a power supply circuit, a differential circuit, a second switch circuit and an electromagnet, wherein the electromagnet comprises a starting winding, a maintaining winding and a choke winding; the power input end of the EMC filter circuit is connected with a power grid, the output end of the EMC filter circuit is connected with the input end of the rectifier circuit, the output end of the rectifier circuit is respectively connected with the public end of the double coils of the electromagnet and the input end of the voltage reduction circuit, the output end of the voltage reduction circuit is connected with the power circuit and the comparison circuit, the power circuit supplies power to the comparison circuit, the first switch circuit and the second switch circuit, the output end of the comparison circuit is connected with the first switch circuit and the input end of the differential circuit, the first switch circuit is connected with the maintaining winding, the output end of the differential circuit is connected with the switch power supply 2, and the second switch circuit is connected with the starting winding.

2. A multi-coil shunt release as claimed in claim 1, wherein: the choke winding is used for restraining surge current, the starting winding is used for powerfully starting the electromagnet, and the maintaining winding is used for keeping the position of the movable iron core after starting.

3. A multi-coil shunt release as claimed in claim 1, wherein: and an inductance component of the EMC circuit is a group of coil windings inside the electromagnet.

4. A multi-coil shunt release as claimed in claim 1, wherein: the rectifier circuit is a discrete component or a component in the form of a full bridge, and rectifies an alternating current voltage into a pulsating direct current voltage.

5. A multi-coil shunt release as claimed in claim 1, wherein: the pulsating direct current voltage output by the rectifying circuit is reduced by a voltage reducing circuit in advance, and then is respectively supplied to a power supply circuit and a comparison circuit.

6. A multi-coil shunt release as claimed in claim 1, wherein: the comparison circuit adopts a micro-power consumption device.

7. A multi-coil shunt release as claimed in claim 1, wherein: the first switch circuit and the second switch circuit are circuits formed by power MOS tubes or SCR or triode circuits.