CN2208751Y - Electronic automatic switch - Google Patents
Electronic automatic switch Download PDFInfo
- Publication number
- CN2208751Y CN2208751Y CN 94224450 CN94224450U CN2208751Y CN 2208751 Y CN2208751 Y CN 2208751Y CN 94224450 CN94224450 CN 94224450 CN 94224450 U CN94224450 U CN 94224450U CN 2208751 Y CN2208751 Y CN 2208751Y
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- CN
- China
- Prior art keywords
- circuit
- voltage
- current
- automatic switch
- anode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an electronic automatic switch which is applied to an ac load, and the electronic controlling part of the utility model comprises a current sample circuit, a voltage amplifying circuit, a current regulating circuit, an inverse time-limit circuit, a voltage comparing and amplifying circuit, and the executive circuit of an electronic-protection automatic trip. The utility model is characterized in that both terminals of the inverse time-limit circuit are connected with a non-overload blocking discharge circuit in parallel; the current sampling circuit adopts a copper resistor and a voltage mutual inductor; the voltage amplifying circuit adopts a precise amplifying peak-detector circuit; the current regulating circuit adopts a multi-turn type potentiometer. Compared with mechanical automatic switches, the electronic automatic switch has the advantages of favorable reliability, high sensitivity, small volume, adjustable current magnitude, accurate inverse time-limit tripping operation, etc.
Description
The utility model relates to a kind of electronic type automatic switch, is applied among the AC load.
Electronic type automatic switch (claiming the electronic air sky to close again); be widely used in the electric control system; it is to increase electronic control part on existing mechanical air switch; electronic control part generally comprises: current sampling circuit; voltage amplifier circuit; current regulating circuit, inverse time lag circuit, voltage contrasting amplified circuit and Electronic Protection release executive circuit.In use,, cause the misoperation of Electronic Protection release, influenced the electronic air switch and promoted because voltage-stabiliser tube electric leakage or interference signal slowly rise delay capacitor voltage.
The utility model purpose is to provide that reliable, the sensitive spirit of a kind of switch motion is high, volume is little, regulated value electronic type automatic switch accurately.
The technical solution of the utility model: (1) is on the inverse time lag of existing electronic type automatic switch circuit, and connect a non-overload and block discharge circuit, improving the reliability of circuit, 2, the current sampling transducer adopts copper resistance, realizes that volume is little, highly sensitive.3, voltage amplifier circuit adopts the accurate peak-detector circuit that amplifies, and realization is good with faint sensor signal high-fidelity amplification, accuracy.4, current regulating circuit adopts multiturn potentiometer, makes regulated value accurate.
Below in conjunction with embodiment and accompanying drawing thereof technology contents of the present utility model is described further.
Fig. 1 is the circuit block diagram of a kind of embodiment of the utility model electronic type automatic switch.
Fig. 2 is the electrical schematic diagram of Fig. 1 electronic type automatic switch embodiment.
By Fig. 1, Fig. 2, present embodiment is an electronic type automatic switch with overload protection function.Electronic control circuit comprises: current sampling circuit, and voltage amplifier circuit, current regulating circuit, the inverse time lag circuit, voltage contrasting amplified circuit and Electronic Protection release executive circuit, the inverse time lag circuit also connects a non-overload blockade discharge circuit.The inverse time lag circuit is by resistance (R among the embodiment
6), voltage-stabiliser tube (V
1) and electric capacity (C
2) form, non-overload is blocked discharge circuit and is comprised integrated operational amplifier (N
2), isolating diode (VD
2) and current-limiting resistance (R
7), resistance (R
6) meet integrated operational amplifier (N
2) anode, integrated operational amplifier (N
2) output termination isolating diode (VD
2) negative terminal, isolating diode (VD
2) anode through resistance (R
7) meet electric capacity (C
2) anode.Setting up non-overload, to block the purpose of discharge circuit be when the non-overload of load, by this circuit with delay capacitor (C
2) anode is clamped at zero level, gives delay capacitor (C
2) discharge loop over the ground is provided, blocked delay capacitor (C
2) input, to avoid because of voltage-stabiliser tube electric leakage in the inverse time lag circuit, interference signal and instantaneous overload etc. make delay capacitor (C
2) slowly rise, cause the automatic switch misoperation, improve delay capacitor (C simultaneously
2) utilance.This is principal character of this electronic type automatic switch.When load was in overload, Current Regulation potentiometer centre cap output voltage was greater than integrated operational amplifier (N
2) negative terminal voltage, integrated operational amplifier (N
2) the output high level, overload indicator elment (V
2) bright, non-blockade discharge circuit is ineffective, and potentiometer centre cap overload signal is by inverse time lag circuitous resistance (R
6), voltage-stabiliser tube (V
1) to electric capacity (C
2) charging, when capacitance voltage rises to greater than integrated operational amplifier (N
3) during the anode bias voltage, output low level, the action of Electronic Protection release, the automatic trip of automatic switch main circuit.The Electronic Protection release is installed in automatic switch short-circuit release opposite side, the action of control tripping mechanism.Current sampling circuit comprises copper resistance (R
A) and voltage transformer (T
V).Copper resistance R
ABe connected in the automatic switch main circuit, its two ends also meet voltage transformer (T
V) primary coil, voltage transformer secondary coil one termination voltage amplifying circuit (N
1) input (anode), other end earth terminal, the micro voltage on the copper resistance can reflect AC load operating current size truly, voltage amplifier circuit adopts the accurate peak-detector circuit that amplifies, this circuit comprises integrated operational amplifier (N
1), feedback resistance (R
2, R
1), detector diode (V
D1), current-limiting resistance (R
3), charging capacitor (C
1).Integrated operational amplifier (N
1) output draws two branch roads, an output branch road meets detector diode (V
D1) anode, detector diode (V
D1) negative terminal is through current-limiting resistance (R
3) meet charging capacitor (C
3) anode, another output branch road is a feedback branch, by resistance (R
2) and (R
1) form series circuit, be connected between integrated operational amplifier output, negative terminal and the ground end electric capacity (C respectively
1) two termination Current Regulation potentiometer (R
P), the voltage transformer secondary coil meets integrated operational amplifier (N
1) anode.The purpose that this circuit is set is that in the future autobiography sensor small-signal is carried out high fidelity and zoomed into certain amplitude peaks threshold voltage.Inverse time circuit input end (R
6) voltage by potentiometer (R
P) the centre cap determining positions, in a certain current range,, need only change potentiometer (R to the load of different rated current
P) the centre cap position, just can obtain identical output voltage signal, this voltage is only relevant with the load multiple, brings great convenience for production and use.Potentiometer (R
P) adopt multi-turn formula potentiometer, represent the Control current value by this potentiometer number of turns of rotation.
In sum, this electronic automatic switch is compared with former mechanical automatic switch, Except having former mechanical automatic switch short-circuit protection; also has overload protection function; good reliability, highly sensitive, volume is little; current value is adjustable; the advantages such as the inverse time lag tripping operation is accurate; especially being suitable for directly control separate unit (three-phase, single-phase) motor occasion, the motor starting that has replaced being made up of A.C. contactor, electrothermal relay, button plug-in strip etc., stopping and holding circuit, is that the automation devices of protecting is controlled at present more satisfactory integrating.
Claims (4)
1, a kind of electronic type automatic switch; its electronic control part comprises current sampling circuit, voltage amplifier circuit, current regulating circuit, inverse time lag circuit, voltage contrasting amplified circuit and Electronic Protection release executive circuit; it is characterized in that inverse time lag circuit two ends and connect a non-overload blocking discharge circuit, this circuit comprises integrated operational amplifier (N
2), isolating diode (V
D2) and current-limiting resistance (R
7), resistance (R
6) meet integrated operational amplifier (N
2) anode, integrated operational amplifier (N
2) output termination isolating diode (V
D2) negative terminal, isolating diode (V
D2) anode through resistance (R
7) meet electric capacity (C
2) anode.
2, electronic type automatic switch according to claim 1 is characterized in that current sampling circuit comprises copper resistance (R
A), voltage transformer (T
V), copper resistance is serially connected in the main circuit of automatic switch, its two ends are attempted by voltage transformer (T
V) primary coil, voltage transformer secondary coil one termination voltage amplifying circuit (N
1) anode, the other end is held with being.
3, electronic type automatic switch according to claim 1 and 2 is characterized in that voltage amplifier circuit adopts the accurate peak-detector circuit that amplifies, and this circuit comprises integrated operational amplifier (N
1), feedback resistance (R
2, R
1), detector diode (V
D1), current-limiting resistance R
3, charging capacitor (C
1), integrated operational amplifier (N
1) output draws two branch roads, an output branch road meets detector diode (V
D1) anode, detector diode (V
D1) negative terminal is through current-limiting resistance (R
3) meet charging capacitor (C
3) anode.Another output branch road is a feedback branch, by resistance (R
2) and (R
1) form series circuit, be connected between integrated operational amplifier output, negative terminal and the ground end electric capacity (C respectively
1) two termination Current Regulation potentiometer (R
P), the voltage transformer secondary coil meets integrated operational amplifier (N
1) anode.
4, electronic type automatic switch according to claim 3 is characterized in that Current Regulation potentiometer (R
P) be multi-turn formula potentiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94224450 CN2208751Y (en) | 1994-07-27 | 1994-07-27 | Electronic automatic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94224450 CN2208751Y (en) | 1994-07-27 | 1994-07-27 | Electronic automatic switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2208751Y true CN2208751Y (en) | 1995-09-27 |
Family
ID=33837859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94224450 Expired - Fee Related CN2208751Y (en) | 1994-07-27 | 1994-07-27 | Electronic automatic switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2208751Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545143A (en) * | 2010-12-13 | 2012-07-04 | 华为技术有限公司 | Device and method for detection and protection and circuit board |
-
1994
- 1994-07-27 CN CN 94224450 patent/CN2208751Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545143A (en) * | 2010-12-13 | 2012-07-04 | 华为技术有限公司 | Device and method for detection and protection and circuit board |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |