CN207264977U - For turning off the circuit of inductive load - Google Patents
For turning off the circuit of inductive load Download PDFInfo
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- CN207264977U CN207264977U CN201721307278.9U CN201721307278U CN207264977U CN 207264977 U CN207264977 U CN 207264977U CN 201721307278 U CN201721307278 U CN 201721307278U CN 207264977 U CN207264977 U CN 207264977U
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Abstract
This disclosure relates to the circuit for turning off inductive load, it is connected between external power supply and the inductive load.The circuit includes：Rectifier module, for carrying out rectification to the voltage input signal from external power supply；Voltage monitoring module, for receiving and monitoring the rectified voltage input signal from rectifier module, wherein when voltage input signal is more than predefined threshold voltage, voltage monitoring module output voltage signal；Voltage buffer module, for voltage signal of the intermediate storage from voltage monitoring module and is converted to current signal by voltage signal；Switch module, for when receiving the current signal from voltage buffer module, switch module turns on so that the external power supply powers the inductive load, and when not receiving the current signal from voltage buffer module more than predetermined amount of time, switch module turns off；Energy release module, for when switch module turns off, consuming the electric energy kept in the inductive load.
Description
Technical field
This disclosure relates to circuit field, more particularly, to a kind of circuit for being used to turn off inductive load.
Background technology
In for example using the inductive load circuit of contactor or relay, when the inductive load power-off of energization,
Continuous current circuit is formed in the energy of coil internal reservoir so that electric current declines slow.This will cause to need after externally fed is cut off
At least hundreds of milliseconds of times it could disconnect the contact of contactor or relay, it is impossible to meet the needs for rapidly switching off.
A kind of current solution method controls the shut-off of semiconductor element using micro control unit, to reduce contactor
Turn-off time.However, this method is excessive for the cost of traditional contactors, because not having microcontroller in traditional contactors
Element.
Utility model content
The purpose of the disclosure is to provide a kind of circuit for being used to turn off inductive load.The circuit is connected external power supply
Between inductive load, including：Rectifier module, is arranged for carrying out the voltage input signal from the external power supply
Rectification；Voltage monitoring module, is arranged for receiving and monitors the rectified voltage input signal from the rectifier module,
Wherein when the voltage input signal is more than predefined threshold voltage, the voltage monitoring module output voltage signal；Voltage delays
Die block, is arranged for voltage signal of the intermediate storage from the voltage monitoring module and the voltage signal is converted to electric current
Signal；Switch module, is arranged for when receiving the current signal from the voltage buffer module, which leads
Passing to makes the external power supply power the inductive load, and works as and do not received from the voltage buffer more than predetermined amount of time
During the current signal of module, switch module shut-off；Energy release module, is arranged for when the switch module turns off,
Consume the electric energy kept in the inductive load.
, can be fast by the circuit of the disclosure after external power supply is cut off by being according to the advantages of circuit of the disclosure
The continuous current circuit formed between the coil of inductive load (such as contactor) and the semiconductor of rectifier is cut off fastly, so that aobvious
Write the turn-off time that ground reduces the contact of inductive load.
In certain embodiments, which has stable-pressure device, for setting the threshold voltage.
In certain embodiments, which includes capacitor, for the intermediate storage voltage monitoring module
The voltage signal of output.
In certain embodiments, diode is disposed between the stable-pressure device and the capacitor, for preventing electric current
The voltage monitoring module is flowed to from the voltage buffer module.
In certain embodiments, which includes surge-voltage protection.
In certain embodiments, which is photoelectrical coupler.
In certain embodiments, which is the contactor or relay for having coil.
In certain embodiments, the voltage input signal of the external power supply is alternating voltage or DC voltage.
Brief description of the drawings
Described in detail below, the above and other objects, features and advantages of embodiment of the disclosure in conjunction with the accompanying drawings
It will become more clearly understood from.In the accompanying drawings, will by example and it is nonrestrictive in a manner of embodiment of the disclosure is illustrated,
Wherein：
Fig. 1 shows the structure diagram for being used to turn off the circuit of inductive load according to the embodiment of the present disclosure；
Fig. 2 shows the circuit diagram for being used to turn off the circuit of inductive load according to the embodiment of the present disclosure；
Fig. 3 shows another circuit diagram for being used to turn off the circuit of inductive load according to the embodiment of the present disclosure；And
Fig. 4 is shown by the simulation curve figure that inductive load is turned off according to the circuit of the embodiment of the present disclosure.
Embodiment
The principle of the disclosure is described below by some embodiments.It should be appreciated that these embodiments are merely for explanation and side
Assistant solves the purpose of the disclosure, rather than the limitation to the scope of the present disclosure.In addition, the number occurred in embodiment is all only
Exemplary, other numbers can also be selected in the reasonable scope.Those skilled in the art are in embodiments given below
On the basis of, the feature of following embodiments can be carried out arbitrarily to combine and adjust, these should all belong to the protection of the disclosure
Scope.
As described herein, term " comprising " and its various variations are construed as open-ended term, it means that " bag
Include but be not limited to ".Term "based" is construed as " being based at least partially on ".In addition, illustrate the device type provided below
Number and value it is only schematical, be not construed as the limitation to the disclosure.
Fig. 1 shows the structure diagram for being used to turn off the circuit 1 of inductive load according to the embodiment of the present disclosure.According to the knot
Structure block diagram, mainly includes rectifier module 10, voltage monitoring module according to the circuit 1 for being used to turn off inductive load of the disclosure
20th, voltage buffer module 30, switch module 40 and energy release module 50.Each mould is explained in detail below in conjunction with Fig. 2 and Fig. 3
The function of block.
Fig. 2 shows the circuit diagram for being used to turn off the circuit 1 of inductive load according to the embodiment of the present disclosure.Wherein, inductance
Property load may, for example, be contactor or relay etc., contactor or relay especially with coil.
In this embodiment, rectifier module 10 is configured to the rectifier bridge being made of four diode D1-D4.The rectification
Input terminal P1, P2 and external power supply connection of bridge, then carry out rectification to the voltage input signal of external power supply, finally will be through whole
Voltage after stream is transferred to voltage monitoring module 20.
In the embodiment shown in Figure 2, the input voltage of external power supply is either alternating voltage or direct current
Pressure.When input voltage is alternating voltage, which alternately exports via diode D1, D4 and diode D3, D2, from
And AC-input voltage is set to be converted to DC input voitage.When input voltage is DC voltage, i.e., when input terminal P1 is positive electricity
Gesture and when input terminal P2 is zero potential or earth potential, then diode D1, D4 is constantly turned on, so that DC input voitage is passed
It is delivered to voltage monitoring module 20.For ease of understanding, in the following description by taking simple alternating current input voltage as an example.
In certain embodiments, rectifier module 10 can include surge-voltage protection EC1.Pass through the surge voltage
Protective device EC1 can limit the current potential of the input voltage from external power supply.It is electric when occurring excessive impact in external power supply
During pressure, surge-voltage protection EC1 by voltage clamp on relatively low current potential set in advance, to prevent excessive impact
Component in voltage damage circuit.
In fig. 2, voltage monitoring module 20 includes two resistance R1, R2, two zener diodes D5, D6 and two crystalline substances
Body pipe T1, T2.Wherein resistance R2 be arranged for transistor T1 provide bias voltage, zener diode D5 be arranged for
Transistor T2 provides bias voltage, and zener diode D6 is arranged for the threshold voltage of setting voltage monitoring module 20.
Voltage monitoring module 20 is arranged for receiving the voltage after rectified from rectifier module 10, and monitors
Whether the voltage exceedes threshold voltage set in advance.For this reason, voltage monitoring module 20 includes stable-pressure device D6 in this example,
E.g. zener diode.By selecting the zener diode with appropriate operating voltage, voltage monitoring module can be set
20 threshold voltage.In this example, zener diode D6 is for example chosen to have the operating voltage of 15V.
In each cycle, it is rectified after sinusoidal voltage rise to spike potential (such as 300V) from zero potential, and from
Spike potential drops to zero potential again.In the starting stage that voltage rises from zero potential, transistor T1, T2 are first in turning off
State, at this time electric current flow through the branch being made of resistance R1, R2 and diode D5, D6.When the pressure drop rise on diode D5 extremely
During bias voltage (such as 3.5V) of transistor T2, transistor T2 conductings, so as to make current flow through transistor T2 and delay to voltage
Die block 30 charges.In the circuit, on the one hand diode D5 makes the pressure drop of transistor T2 grid with source electrode both ends at circuit
About 3.5V or so is maintained under normal work, on the other hand can also make the pressure drop at the grid of transistor T2 and source electrode both ends not
More than a stop voltage (such as 15V in the present embodiment), thus in the case of circuit abnormality by voltage clamping in 15V to play
Protective effect.
Meanwhile electric current flows through transistor T2, diode D6 and resistance R2 so that diode D6 reaches its operating voltage 15V,
And the pressure drop on R2 is set to increase to the bias voltage (such as 0.7V) of transistor T1, so that T1 is turned on.At this time, A points in Fig. 2
Voltage be approximately 15.7V, and the voltage of B points is approximately 15.7V+3.5V=19.2V.
Since transistor T1 is turned on, the pressure drop between the emitter of T1 and collector is caused to reduce, and then cause the electricity of B points
Pressure is reduced since 19.2V.When the voltage of B points is decreased below 19.2V, transistor T2 shut-offs.
Transistor T2 shut-offs further result in the electric current decline for flowing through resistance R2.By the resistance for properly selecting resistance R2
Value, can cause the pressure drop when transistor T2 is turned off on resistance R2 to be less than the bias voltage of T1, so that T1 is also switched off.
Pass through Dynamic Regulating Process described above, i.e. the process that transistor T1, T2 are alternately turned on and turned off so that
When the voltage signal for inputting the voltage monitoring module is higher than predefined threshold voltage, the current potential of A points is fixed on one by approximation
On the voltage level of a stabilization (being herein approximate 15.7V), so that the voltage buffer module 30 downstream connected provides stabilization
Voltage.
Voltage buffer module 30 includes capacitor C1, so as to voltage signal of the intermediate storage from voltage monitoring module 20 simultaneously
By output voltage stabilization on a fixed voltage value.By the resistance R3 being connected between capacitor C1 and switch module 40,
The voltage signal of capacitor C1 can be converted to current signal to export to switch module 40.
In certain embodiments, the cloth between the output terminal of voltage monitoring module 20 and the input terminal of voltage buffer module 30
It is equipped with diode D7.In this way, the voltage due to being stored in capacitor C1 can be avoided and produce adverse current and flow to electricity
Press the electric current of monitoring modular 20.
The input terminal of switch module 40 is in parallel with capacitor C1 via resistance R3.In this embodiment, 40 quilt of switch module
It is configured to photoelectrical coupler U1.When sufficiently large electric current is fed into the input terminal of photoelectrical coupler U1, photoelectrical coupler U1's
Output terminal closes, so as to form the circuit of closure so that the voltage of external power supply can be applied to load by the closed circuit
Both ends.
When sinusoidal voltage is decreased below threshold voltage in the cycle, voltage monitoring module 20 is temporarily ceased to be delayed to voltage
Die block 30 is powered.At this time, by the electric energy stored in the energy-storage travelling wave tube in voltage buffer module 30, i.e. capacitor C1 continue to
Outer power supply.Avoid causing mistakenly to turn off photoelectrical coupler U1 less than threshold voltage since outer power voltage is of short duration with this.
In other words, only when voltage monitoring module 20 monitors that outer power voltage is consistently less than threshold voltage within a period of time
When, it can just cause the output terminal of photoelectrical coupler 40 to disconnect.By this way, the influence of voltage disturbance can also be reduced.
When cutting off external power supply, voltage monitoring module 20 stop output voltage signal so that capacitor C1 from charging shape
State switchs to discharge condition.After the of short duration electric discharges of capacitor C1, the output terminal of photoelectrical coupler U1 disconnects, so as to cut off inductance
Property load via rectifier module 10 continuous current circuit.
In this case, the energy stored in the coil of inductive load is by the energy with the load parallel connection
Release module 50 is released.The energy release module 50 has higher resistance value, is born so as to promptly consume inductive
Remaining electric energy in load, so as to largely reduce the turn-off time for the contact for disconnecting contactor or relay.
Fig. 3 shows another circuit diagram for being used to turn off the circuit 1 of inductive load according to the embodiment of the present disclosure.Below only
Difference, i.e. voltage monitoring module 20 for embodiment illustrated in fig. 3 and Fig. 2 is described, can be with wherein identical part
With reference to the content described above in association with Fig. 2.
In the voltage monitoring module 20 of embodiment illustrated in fig. 3, resistance R4 and R6 are biasing resistor, for for transistor T3
Bias voltage is provided.Meanwhile resistance R4 and R6 can also limit the electric current for flowing through zener diode D12.Zener diode D12 makes
The current potential for obtaining transistor T3 grids (C points in corresponding diagram 3) is for example stablized in 16V.It should be noted that in this resistance and voltage stabilizing two
The quantity of pole pipe can be adjusted as needed, such as zener diode D12 can also be by multiple zener diodes series connection structure
Into the zener diode of such as two 8V.
Transistor T3 can be IGBT herein, and when outer power voltage provides low pressure (such as 24V), T3 can also be used
Bipolar transistor.When resistance R4 and R6 are capable of providing enough bias voltages, transistor T3 conductings.Voltage monitoring mould at this time
Voltage on the output voltage of block 20, i.e. transistor T3 source electrodes (D points in corresponding diagram 3) is approximately 16V-0.7V=15.3V.
Resistance R5 and zener diode D13 mainly plays a part of to protect transistor T3 herein.Specifically, resistance R5 can
The electric current of transistor is flowed through in limitation, and zener diode D13 then ensures that the voltage between the grid and source electrode of transistor T3 will not
It is excessive, such as no more than 15V, so as to protect transistor T3 not damaged because of excessive voltage or electric current.
Fig. 4 is shown by the simulation curve figure that inductive load is turned off according to the circuit 1 of the embodiment of the present disclosure.The curve map
Abscissa represent the time, and ordinate represents to flow through the current value of load.In time started t=0, loading external power supply is simultaneously
Inductive load is set to progressively reach normal operating conditions.As time t=113ms (referring to the point I in Fig. 4), external power supply quilt
Cut-out, and it is used to turn off the circuit 1 of inductive load so that being stored in the electric current in inductive load by according to the disclosure
Rapid release.As time t=120ms (referring to the point II in Fig. 4), can discharge completely in inductive load is stored in.
Can be seen that from the result of the emulation just can make the electric current in loading coil be rapidly reduced to approach in 10ms
Null value, so as to significantly shorten the time for the contact for disconnecting contactor or relay.
Above description is only the alternative embodiment of the disclosure, is not intended to limit the disclosure.For those skilled in the art
For member, the disclosure can have various modifications and variations.All any modifications within the spirit and principle of the disclosure, made,
Equivalence replacement, improvement etc., should be included within the protection domain of the disclosure.
Claims (8)
1. a kind of circuit (1) for being used to turn off inductive load, the circuit (1) are connected external power supply and the inductive
Between load, it is characterised in that the circuit (1) includes：
Rectifier module (10), is arranged for carrying out rectification to the voltage input signal from the external power supply；
Voltage monitoring module (20), is arranged for receiving and monitors the rectified voltage from the rectifier module (10)
Input signal, wherein when the voltage input signal is more than predefined threshold voltage, the voltage monitoring module (20) is defeated
Go out voltage signal；
Voltage buffer module (30), is arranged for voltage signal of the intermediate storage from the voltage monitoring module (20) and incites somebody to action
The voltage signal is converted to current signal；
Switch module (40), is arranged for when receiving the current signal from the voltage buffer module (30),
The switch module (40) turns on so that the external power supply powers the inductive load, and works as and exceed predetermined amount of time
When not receiving the current signal from the voltage buffer module (30), switch module (40) shut-off；
Energy release module (50), is arranged for, when the switch module (40) turns off, consuming in the inductive load
Temporary electric energy.
2. circuit (1) according to claim 1, it is characterised in that the voltage monitoring module (20) has stable-pressure device
(D6；D12), for the setting threshold voltage.
3. circuit (1) according to claim 2, it is characterised in that the voltage buffer module (30) includes capacitor
(C1；C2), the voltage signal exported for voltage monitoring module (20) described in intermediate storage.
4. circuit (1) according to claim 3, it is characterised in that in the stable-pressure device (D6；D12) with the capacitance
Device (C1；C2 diode (D7 is disposed between)；D14), for preventing electric current from flowing to institute from the voltage buffer module (30)
State voltage monitoring module (20).
5. circuit (1) according to claim 1, it is characterised in that the rectifier module (10) is protected including surge voltage
Protection unit.
6. circuit (1) according to claim 1, it is characterised in that the switch module (40) is photoelectrical coupler.
7. circuit (1) according to claim 1, it is characterised in that the inductive load is the contactor for having coil
Or relay.
8. circuit (1) according to claim 1, it is characterised in that the voltage input signal of the external power supply is exchange
Voltage or DC voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721307278.9U CN207264977U (en) | 2017-10-11 | 2017-10-11 | For turning off the circuit of inductive load |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721307278.9U CN207264977U (en) | 2017-10-11 | 2017-10-11 | For turning off the circuit of inductive load |
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| Publication Number | Publication Date |
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| CN207264977U true CN207264977U (en) | 2018-04-20 |
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| CN201721307278.9U Active CN207264977U (en) | 2017-10-11 | 2017-10-11 | For turning off the circuit of inductive load |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146807A (en) * | 2019-06-05 | 2019-08-20 | 厦门立林电气控制技术有限公司 | A kind of trip coil monitoring circuit and monitoring method |
| CN110197780A (en) * | 2019-06-05 | 2019-09-03 | 厦门立林电气控制技术有限公司 | A kind of trip coil broken string monitoring circuit |
| CN114221317A (en) * | 2021-12-14 | 2022-03-22 | 广东福德电子有限公司 | Low-cost direct-current resistance-inductance load quick disconnection method |
-
2017
- 2017-10-11 CN CN201721307278.9U patent/CN207264977U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146807A (en) * | 2019-06-05 | 2019-08-20 | 厦门立林电气控制技术有限公司 | A kind of trip coil monitoring circuit and monitoring method |
| CN110197780A (en) * | 2019-06-05 | 2019-09-03 | 厦门立林电气控制技术有限公司 | A kind of trip coil broken string monitoring circuit |
| CN114221317A (en) * | 2021-12-14 | 2022-03-22 | 广东福德电子有限公司 | Low-cost direct-current resistance-inductance load quick disconnection method |
| CN114221317B (en) * | 2021-12-14 | 2023-04-07 | 广东福德电子有限公司 | Low-cost direct-current resistance-inductance load quick disconnection method |
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