CN102306483B - Backlight control circuit of electronic display apparatus of breaker - Google Patents
Backlight control circuit of electronic display apparatus of breaker Download PDFInfo
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- CN102306483B CN102306483B CN201110241982.XA CN201110241982A CN102306483B CN 102306483 B CN102306483 B CN 102306483B CN 201110241982 A CN201110241982 A CN 201110241982A CN 102306483 B CN102306483 B CN 102306483B
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- 238000005259 measurement Methods 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a backlight control circuit of an electronic display apparatus of a breaker. The backlight control circuit disclosed in the invention comprises a controller, a current measuring circuit, a switch circuit and a power supply identification circuit, wherein the current measuring circuit, the switch circuit and the power supply identification circuit are respectively connected with the controller. The current measuring circuit is used for carrying out conditioning on a current measuring signal and transmitting an output signal to the controller; the power supply identification circuit is used for identifying whether there is power supply from an external power source and transmitting identified information to the controller; and the controller is used for controlling connection or disconnection of the switch circuit according to signals transmitted by the current measuring circuit and/or the power supply identification circuit. In addition, the invention also discloses two breakers that utilize the backlight control circuit provided in the invention. According to the invention, the backlight control circuit has advantages of simple structure and flexible usage and can be applied to a self-powered breaker or a breaker with combination of power supply by itself and external power supply; moreover, backlights on an electronic display apparatus can be controlled flexibly according to a power supply state.
Description
Technical field
The present invention relates to a kind of backlight control circuit of electronic display unit, relate in particular to a kind of backlight control circuit of breaker electronic display device.
Background technology
Along with the development of electronic technology, adopt electronic trip unit to be widely applied as the isolating switch of detection, control assembly.And along with improving constantly that user requires isolating switch, can monitoring current, in real time circuit electric current, provide the isolating switch of more query function and set-up function to be more and more subject to user's concern, the most of relatively little liquid crystal (LCD) of power consumption that adopts of isolating switch in the market shows.
In isolating switch, current transformer should provide the power supply of electronic trip unit, and current measurement signal is provided again.If adopt demonstration backlight can cause the increase of electronic trip unit power consumption, particularly in the situation that current transformer provides energy comparatively critical, impact is larger, can cause the unstable of electronic trip unit power supply.When especially isolating switch powers on, exist in the situation of short trouble, due to impact backlight, can cause power-on time slow, supply voltage can not meet the phenomenons such as requirement of threading off, and has thus potential safety hazard, causes that extra fault occurs.
In order to reduce the power consumption of electronic trip unit, conventional liquid crystal type electronic trip unit is not generally with backlight.But do not have backlightly, under darker environmental baseline, be difficult for seeing clearly shown content.Though or be with backlight, but can only assist the mode of Power supply just can light liquid crystal by outside, increase thus device, take certain space, produced extra input and maintenance cost, and the mode of external accessory power supply is not strong in a lot of occasion applicabilities.
Therefore the electronic trip unit to having electronic display device, adopts a kind of rational backlight control outbalance that just seems.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiency of existing breaker electronic display device, provide a kind of simple in structure, use the backlight control circuit of breaker electronic display device flexibly.
The backlight control circuit of breaker electronic display device of the present invention, comprises controller, and the current measurement circuit being connected with this controller respectively, on-off circuit, power supply identification circuit; Described current measurement circuit is used for current measurement signal to nurse one's health, and sends output signal to described controller; Whether described power supply identification circuit there is external power source for identification, and sends the information identifying to described controller; Described controller is switched on or switched off according to on-off circuit described in the signal controlling of current measurement circuit and/or the transmission of power supply identification circuit.
Described controller in accordance with the following methods gauge tap circuit is switched on or switched off:
When power supply identification circuit identifies while there is external power source, control described on-off circuit and connect;
When power supply identification circuit identifies while there is not external power source, judge whether the corresponding current value of output signal of described current measurement circuit is greater than a predefined threshold value, in this way, control described on-off circuit and connect; As no, control described on-off circuit and disconnect.
Preferably, described power supply identification circuit comprises a triode V1, and resistance R 1, R2, R3; Resistance R 1, R2 series connection, and line is between the two connected with the base stage of triode V1; Resistance R 3 is connected with the collector of triode V1, and line is between the two connected with described controller.
Utilize backlight control circuit of the present invention, and according to the difference of the backlight electric power of electronic display unit, can obtain following two kinds of isolating switchs:
An isolating switch, described isolating switch comprises for extract the current transformer of electric energy from monitored electrical network, and for showing the electronic display unit of isolating switch monitoring information; Described electronic display unit backlight by described current transformer power supply, described electronic display unit also comprises the backlight control circuit described in as above arbitrary technical scheme; Wherein current measurement circuit is connected with the output terminal of described current transformer, for measuring the output current signal of current transformer; On-off circuit is series in described feed circuit backlight.
An isolating switch, described isolating switch comprises for extract the current transformer of electric energy from monitored electrical network, and for showing the electronic display unit of isolating switch monitoring information; The backlight of described electronic display unit combined power supply by described current transformer and external power source, and described electronic display unit also comprises the backlight control circuit described in as above arbitrary technical scheme; Wherein current measurement circuit is connected with the output terminal of described current transformer, for measuring the output current signal of current transformer; On-off circuit is series in described feed circuit backlight; Power supply identification circuit is connected with described external power source.
Whether the present invention has external power source to identify by a power supply identification circuit to the electronic display unit of isolating switch, when there is external power source, controls the on-off circuit being serially connected with in backlight power supply circuit and connects, and makes the conducting all the time of backlight power supply circuit; When not existing external power source or external power source abnormal, output by current measurement circuit judges that whether the electric energy of self-energizing current transformer extraction is sufficient, as abundance, control described on-off circuit and connect feed circuit backlight, make the electric energy of Current Transformer extraction as backlight electric power; As extract electric energy deficiency, by described on-off circuit, turn-off feed circuit backlight.This backlight control circuit can be applicable to self-energizing isolating switch, or the isolating switch that combines with outside energy supply of self energizing; And can to the backlight of electronic display unit, control flexibly according to energy supply situation.
Accompanying drawing explanation
Fig. 1 is the backlight control circuit structured flowchart of breaker electronic display device of the present invention;
Fig. 2 is the current measurement circuit figure in the backlight control circuit of breaker electronic display device of the present invention;
Fig. 3 is the power supply identification circuit figure in the backlight control circuit of breaker electronic display device of the present invention;
Fig. 4 is the circuit diagram of the backlight control circuit middle controller of breaker electronic display device of the present invention;
Fig. 5 is the circuit diagram of on-off circuit in the backlight control circuit of breaker electronic display device of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated:
The backlight control circuit of breaker electronic display device of the present invention, (part in dotted line frame), comprises controller as shown in Figure 1, and the current measurement circuit being connected with this controller respectively, on-off circuit, power supply identification circuit; Described current measurement circuit is used for current measurement signal to nurse one's health, and sends output signal to described controller; Whether described power supply identification circuit there is external power source for identification, and sends the information identifying to described controller; Described controller is switched on or switched off according to on-off circuit described in the signal controlling of current measurement circuit and/or the transmission of power supply identification circuit.
The circuit structure of current measurement circuit as shown in Figure 2, during use, the collection signal voltage of Current Transmit in isolating switch output, by R7, the RC integrating circuit reduction that C1 forms, after integrated circuit U2A homophase amplifies, by giving controller after R10, R11 level conversion.R8, R9 form backfeed loop, and the multiple that homophase amplifies is 1+R9/R8.The preferred LM224 integrated circuit of U2A wherein.
The circuit structure of power supply identification circuit as shown in Figure 3, comprises a triode V1, and resistance R 1, R2, R3; Resistance R 1, R2 series connection, and line is between the two connected with the base stage of triode V1; Resistance R 3 is connected with the collector of triode V1, and line is between the two connected with described controller.During use, resistance R 1 is connected (as without external power source, not needing to connect) with external power source.After outer power voltage is by resistance R 1, R2 current limliting dividing potential drop, make triode V1 conducting, V1 collector output low level is given controller, and R3 is pull-up resistor.When without outer power voltage, triode V1 is in cut-off state, and V1 collector output high level is given MCU circuit.Whether controller is identified according to the level of V1 collector is outer power supply.
As shown in Figure 4, reference voltage chip U3 provides the AD reference voltage of conversion to the circuit structure of controller, can select MAX6104 and other similar chip.C2, C3 are decoupling capacitor.The crystal oscillating circuit being comprised of C4 ~ C5 and Y1 and reset circuit U4 guarantee that microcontroller U5 normally works, the signal of microcontroller U5 to current measurement circuit output, the reference voltage of take carries out A/D conversion as benchmark, obtain detecting corresponding to mutual inductor the numerical value of electric current, carry out relevant computing and processing, carry out relevant order.Microcontroller U5 preferentially adopts M16C, and U4 preferentially adopts MAX821, and reference voltage chip U3 preferentially adopts REF3140.
The circuit structure of on-off circuit as shown in Figure 5, when meeting the backlight lightening condition of electronic display unit (while having external power source; Or without external power source, but the electric energy of self energizing current transformer output is while meeting request for utilization) controller output high level, electronic switch transistor V2 conducting, is also that the backlight power supply loop of electronic display unit forms path, backlight lightening.When the light ignition condition of discontented instep, controller output low level, electronic switch transistor V1, in cut-off state, is also that the backlight power supply loop of electronic display unit does not form path, does not backlightly light.
By backlight control circuit of the present invention for the isolating switch of having electronic display device (described electronic display unit backlight by self energizing current transformer power supply, or by self energizing current transformer, combined power supply with external power source) time, described current measurement circuit is connected with the self energizing current transformer in isolating switch, described on-off circuit is serially connected with in the current supply circuit of electronic display unit, described power supply identification circuit is connected to (if present) with external power source.During normal operation of circuit breaker, detect the identification signal of external power source by power supply identification circuit, if detect, now have external power source, direct gauge tap circuit turn-on, makes the backlight lightening of electronic display unit.If detect without external power source, controller will calculate the signal corresponding to actual current numerical value of being sent here by current measurement circuit, that is the self energizing current transformer energy that can provide, by itself and predefined threshold value, (this value can preferentially guarantee that the minimum value of the required electric energy of the normal work of parts of power supply determines according to needing in isolating switch, for example can set the energy value that this threshold value is equal to or greater than the normal need of work of electronic trip unit minimum in isolating switch, thereby can not affect the work of electronic trip unit while guaranteeing the backlight lightening of electronic display unit) compare, when being greater than this threshold value, controller is controlled the backlight lightening of electronic display unit, when being less than this threshold value, backlightly do not light.Can certainly arrange controller, when fault actions, even when the required electric energy of electronic trip unit work is met, if now without external power source, also forbid controlling the backlight lightening of electronic display unit, energy required when guaranteeing to thread off is unaffected.Also can further arrange: by operation, trigger backlight lightening, after the backlight lightening certain hour of electronic display unit, if without follow-up operation, control backlight extinguishing.That is to say, the backlight control of electronic display unit is identified by software, is lit or extinguishes after conforming to a predetermined condition.
Claims (2)
1. an isolating switch, described isolating switch comprises for extract the current transformer of electric energy from monitored electrical network, and for showing the electronic display unit of isolating switch monitoring information; Described electronic display unit backlight by described current transformer power supply, it is characterized in that, described electronic display unit also comprises backlight control circuit, and described backlight control circuit comprises controller, and the current measurement circuit being connected with this controller respectively, on-off circuit, power supply identification circuit; Described current measurement circuit is used for current measurement signal to nurse one's health, and sends output signal to described controller; Whether described power supply identification circuit there is external power source for identification, and sends the information identifying to described controller; Described controller is switched on or switched off according to on-off circuit described in the signal controlling of current measurement circuit and/or the transmission of power supply identification circuit; Wherein current measurement circuit is connected with the output terminal of described current transformer, for measuring the output current signal of current transformer; On-off circuit is series in described feed circuit backlight; Described controller in accordance with the following methods gauge tap circuit is switched on or switched off:
When power supply identification circuit identifies while there is external power source, control described on-off circuit and connect;
When power supply identification circuit identifies while there is not external power source, judge whether the corresponding current value of output signal of described current measurement circuit is greater than a predefined threshold value, in this way, control described on-off circuit and connect; As no, control described on-off circuit and disconnect.
2. isolating switch as claimed in claim 1, is characterized in that, described power supply identification circuit comprises a triode V1, and resistance R 1, R2, R3; Resistance R 1, R2 series connection, and the line between resistance R 1 and resistance R 2 is connected with the base stage of triode V1; Resistance R 3 is connected with the collector of triode V1, and the line between the collector of resistance R 3 and triode V1 is connected with described controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241982.XA CN102306483B (en) | 2011-08-23 | 2011-08-23 | Backlight control circuit of electronic display apparatus of breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241982.XA CN102306483B (en) | 2011-08-23 | 2011-08-23 | Backlight control circuit of electronic display apparatus of breaker |
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| Publication Number | Publication Date |
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| CN102306483A CN102306483A (en) | 2012-01-04 |
| CN102306483B true CN102306483B (en) | 2014-04-09 |
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| CN201110241982.XA Active CN102306483B (en) | 2011-08-23 | 2011-08-23 | Backlight control circuit of electronic display apparatus of breaker |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1870795A2 (en) * | 2006-06-20 | 2007-12-26 | Forcar Co., Ltd. | Power source connecting circuit device with current transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3899518B2 (en) * | 2002-09-30 | 2007-03-28 | カシオ計算機株式会社 | FUEL CELL SYSTEM, ITS DRIVE CONTROL METHOD, AND ELECTRONIC DEVICE HAVING POWER SUPPLY SYSTEM |
| CN2859893Y (en) * | 2005-07-28 | 2007-01-17 | 上海环达计算机科技有限公司 | Selective circuit of main battery and emergency battery |
| CN101409467B (en) * | 2008-11-26 | 2010-12-15 | 上海电科电器科技有限公司 | circuit breaker controller |
| KR101086974B1 (en) * | 2009-03-03 | 2011-11-29 | 주식회사 엘지화학 | Apparatus and method for controlling relay in electric drive vehicle |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1870795A2 (en) * | 2006-06-20 | 2007-12-26 | Forcar Co., Ltd. | Power source connecting circuit device with current transformer |
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