CN102306483A - 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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- CN102306483A CN102306483A CN201110241982A CN201110241982A CN102306483A CN 102306483 A CN102306483 A CN 102306483A CN 201110241982 A CN201110241982 A CN 201110241982A CN 201110241982 A CN201110241982 A CN 201110241982A CN 102306483 A CN102306483 A CN 102306483A
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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 development of electronic technology, adopt electronic trip unit to obtain widespread use as the isolating switch of detection, control assembly.And along with the user improves constantly what isolating switch required; Can monitoring current, in real time the circuit electric current, provide the isolating switch of more query function and set-up function more and more to be subjected to user's concern, the most of less relatively liquid crystal (LCD) of power consumption that adopts of isolating switch in the market shows.
Current transformer should provide the power supply of electronic trip unit in the isolating switch, and current measurement signal is provided again.If adopt demonstration backlight can cause the increase of electronic trip unit power consumption, particularly provide under the comparatively critical situation of energy influence bigger at current transformer, can cause the instability of electronic trip unit power supply.Exist when especially isolating switch powers under the situation of short trouble, because influence backlight can cause power-on time slow, supply voltage can not satisfy phenomenons such as the requirement of threading off, and has potential safety hazard thus, causes that extra fault takes place.
In order to reduce the power consumption of electronic trip unit, liquid crystal type electronic trip unit commonly used generally is not with backlight.But do not have backlightly, under darker environmental baseline, be difficult for seeing clearly institute's content displayed.Though perhaps be with backlight; But can only just can light liquid crystal through the mode of external auxiliary power supply power supply, increase device thus, 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 to the electronic trip unit of charged sub-display device, adopt 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, on-off circuit, the power supply identification circuit that are connected with this controller respectively; Said current measurement circuit is used for current measurement signal is nursed one's health, and will export signal and send said controller to; Said power supply identification circuit is used for identification and whether has external power source, and sends the information that identifies to said controller; Said controller is switched on or switched off according to the said on-off circuit of signal controlling of current measurement circuit and/or the transmission of power supply identification circuit.
Said controller is switched on or switched off according to following method gauge tap circuit:
When the power supply identification circuit identifies when having external power source, control said on-off circuit and connect;
When the power supply identification circuit identifies when not having external power source, whether the pairing current value of output signal of judging said current measurement circuit in this way, is then controlled said on-off circuit and is connected greater than a pre-set threshold; As not, then control said on-off circuit and break off.
Preferably, said power supply identification circuit comprises a triode V1, and resistance R 1, R2, R3; Resistance R 1, R2 series connection, and line between the two is connected with the base stage of triode V1; Resistance R 3 is connected with the collector of triode V1, and line between the two is connected with said controller.
Utilize backlight control circuit of the present invention, and, can obtain following two kinds of isolating switchs according to the difference of the backlight electric power of electronic display unit:
A kind of isolating switch, said isolating switch comprise the current transformer that is used for extracting from the monitoring electrical network electric energy, and the electronic display unit that is used to show the isolating switch monitoring information; Said electronic display unit backlight by said current transformer power supply, said electronic display unit also comprises the described backlight control circuit of as above arbitrary technical scheme; Wherein current measurement circuit is connected with the output terminal of said current transformer, is used to measure the output current signal of current transformer; On-off circuit is series in the said feed circuit backlight.
A kind of isolating switch, said isolating switch comprise the current transformer that is used for extracting from the monitoring electrical network electric energy, and the electronic display unit that is used to show the isolating switch monitoring information; The backlight of said electronic display unit united power supply by said current transformer and external power source, and said electronic display unit also comprises the described backlight control circuit of as above arbitrary technical scheme; Wherein current measurement circuit is connected with the output terminal of said current transformer, is used to measure the output current signal of current transformer; On-off circuit is series in the said feed circuit backlight; The power supply identification circuit is connected with said external power source.
Whether the present invention has external power source to discern through a power supply identification circuit to the electronic display unit of isolating switch, and when having external power source, the on-off circuit that control is serially connected with in the backlight power supply circuit is connected, and makes the conducting all the time of backlight power supply circuit; When not existing external power source or external power source unusual; Whether the electric energy of judging self-energizing current transformer extraction through the output of current measurement circuit is sufficient; Like abundance; Then control said on-off circuit and connect feed circuit backlight, the electric energy that makes the Current Transformer extraction is as backlight electric power; As extract the electric energy deficiency, then turn-off feed circuit backlight through said on-off circuit.This backlight control circuit can be applicable to self-energizing isolating switch, perhaps the isolating switch that combines with outside energy supply of self energizing; And can control flexibly the backlight of electronic display unit according to the energy supply situation.
Description of drawings
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 the frame of broken lines) comprises controller as shown in Figure 1, and the current measurement circuit, on-off circuit, the power supply identification circuit that are connected with this controller respectively; Said current measurement circuit is used for current measurement signal is nursed one's health, and will export signal and send said controller to; Said power supply identification circuit is used for identification and whether has external power source, and sends the information that identifies to said controller; Said controller is switched on or switched off according to the said on-off circuit of 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, by the acquired signal voltage of the current transformer CT in isolating switch output; By R7; The RC integrating circuit reduction that C1 forms is after the amplification of integrated circuit U2A homophase, through giving controller after R10, the R11 level conversion.R8, R9 constitute backfeed loop, and the homophase amplification multiple is 1+R9/R8.The preferred LM224 integrated circuit of U2A wherein.
The circuit structure of power supply identification circuit comprises a triode V1 as shown in Figure 3, and resistance R 1, R2, R3; Resistance R 1, R2 series connection, and line between the two is connected with the base stage of triode V1; Resistance R 3 is connected with the collector of triode V1, and line between the two is connected with said controller.Resistance R 1 is connected (like no external power source, then not needing to connect) during use with external power source.After outer power voltage is through resistance R 1, R2 current limliting dividing potential drop, make triode V1 conducting, V1 collector output low level is given controller, and R3 is a pull-up resistor.When no outer power voltage, triode V1 is in cut-off state, and V1 collector output high level is given MCU circuit.Whether controller is discerned according to the level of V1 collector is outer power supply.
The circuit structure of controller as shown in Figure 4, reference voltage chip U3 provides the reference voltage of AD conversion, can select MAX6104 and other similar chip for use.C2, C3 are decoupling capacitor.The crystal oscillating circuit and the reset circuit U4 that are made up of C4 ~ C5 and Y1 guarantee microcontroller U5 operate as normal; Microcontroller U5 is to the signal of current measurement circuit output; With the reference voltage is that benchmark carries out the A/D conversion; Obtain detecting the numerical value of electric current corresponding to mutual inductor; Relevant order is carried out in computing of being correlated with and processing.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 satisfying the backlight lightening condition of electronic display unit (when external power source is arranged; Perhaps do not have external power source, but the electric energy of self energizing current transformer output is when satisfying request for utilization) controller output high level, electronic switch transistor V2 conducting also is that the backlight power supply loop of electronic display unit constitutes path, backlight lightening.When the luminous point bright wisp spare of discontented instep, the controller output low level, electronic switch transistor V1 is in cut-off state, also is that the backlight power supply loop of electronic display unit does not constitute path, does not backlightly light.
Isolating switch (said electronic display unit backlight that backlight control circuit of the present invention is used for charged sub-display device by the self energizing current transformer power supply; Perhaps unite power supply by self energizing current transformer and external power source) time; Said current measurement circuit is connected with self energizing current transformer in the isolating switch; Said on-off circuit is serially connected with in the current supply circuit of electronic display unit, said power supply identification circuit is connected (if present) with external power source.During normal operation of circuit breaker, detect the identification signal of external power source through the power supply identification circuit, if detect external power source is arranged this moment, direct gauge tap circuit turn-on then makes the backlight lightening of electronic display unit.If detect no external power source; Then controller will calculate the signal of being sent here by current measurement circuit corresponding to actual current numerical value; That is the self energizing current transformer energy that can provide; (this value can be according to needing the preferential minimum of a value of the required electric energy of parts operate as normal of power supply that guarantees to confirm in the breaker with itself and pre-set threshold; For example can set this threshold value and be equal to or greater than the energy value that the minimum operate as normal of electronic trip unit needs in the breaker; Thereby can not influence the work of electronic trip unit when guaranteeing the backlight lightening of electronic display unit) compare; When greater than this threshold value; The backlight lightening of controller control electronic display unit; When less than this threshold value, backlightly do not light.Can certainly be provided with controller; When fault actions, even when the required electric energy of electronic trip unit work is met, if this moment is no 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 be provided with: trigger backlight lightening through operation, behind the backlight lightening certain hour of electronic display unit, if backlight extinguishing then controlled in no follow-up operation.That is to say that the backlight control of electronic display unit is discerned by software, the back that conforms to a predetermined condition is lighted or is extinguished.
Claims (5)
1. the backlight control circuit of a breaker electronic display device is characterized in that, said backlight control circuit comprises controller, and the current measurement circuit, on-off circuit, the power supply identification circuit that are connected with this controller respectively; Said current measurement circuit is used for current measurement signal is nursed one's health, and will export signal and send said controller to; Said power supply identification circuit is used for identification and whether has external power source, and sends the information that identifies to said controller; Said controller is switched on or switched off according to the said on-off circuit of signal controlling of current measurement circuit and/or the transmission of power supply identification circuit.
2. the backlight control circuit of breaker electronic display device according to claim 1 is characterized in that said controller is switched on or switched off according to following method gauge tap circuit:
When the power supply identification circuit identifies when having external power source, control said on-off circuit and connect;
When the power supply identification circuit identifies when not having external power source, whether the pairing current value of output signal of judging said current measurement circuit in this way, is then controlled said on-off circuit and is connected greater than a pre-set threshold; As not, then control said on-off circuit and break off.
3. like the backlight control circuit of breaker electronic display device as described in the claim 2, it is characterized in that said power supply identification circuit comprises a triode V1, and resistance R 1, R2, R3; Resistance R 1, R2 series connection, and line between the two is connected with the base stage of triode V1; Resistance R 3 is connected with the collector of triode V1, and line between the two is connected with said controller.
4. isolating switch, said isolating switch comprise the current transformer that is used for extracting from the monitoring electrical network electric energy, and the electronic display unit that is used to show the isolating switch monitoring information; The backlight of said electronic display unit is characterized in that by said current transformer power supply said electronic display unit also comprises like claim 1,2 or 3 described backlight control circuits; Wherein current measurement circuit is connected with the output terminal of said current transformer, is used to measure the output current signal of current transformer; On-off circuit is series in the said feed circuit backlight.
5. isolating switch, said isolating switch comprise the current transformer that is used for extracting from the monitoring electrical network electric energy, and the electronic display unit that is used to show the isolating switch monitoring information; The backlight of said electronic display unit united power supply by said current transformer and external power source, it is characterized in that, said electronic display unit also comprises like claim 1,2 or 3 described backlight control circuits; Wherein current measurement circuit is connected with the output terminal of said current transformer, is used to measure the output current signal of current transformer; On-off circuit is series in the said feed circuit backlight; The power supply identification circuit is connected with said external power source.
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 |
Applications Claiming Priority (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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| CN102306483A true CN102306483A (en) | 2012-01-04 |
| CN102306483B CN102306483B (en) | 2014-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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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 (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1596391A (en) * | 2002-09-30 | 2005-03-16 | 卡西欧计算机株式会社 | Power supply system and electronic device comprising the same |
| 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 |
| EP1870795A2 (en) * | 2006-06-20 | 2007-12-26 | Forcar Co., Ltd. | Power source connecting circuit device with current transformer |
| CN101409467A (en) * | 2008-11-26 | 2009-04-15 | 上海电器科学研究所（集团）有限公司 | Circuit breaker controller |
| WO2010101415A2 (en) * | 2009-03-03 | 2010-09-10 | 주식회사 엘지화학 | Apparatus and method for controlling a relay of a hybrid electric vehicle |
-
2011
- 2011-08-23 CN CN201110241982.XA patent/CN102306483B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1596391A (en) * | 2002-09-30 | 2005-03-16 | 卡西欧计算机株式会社 | Power supply system and electronic device comprising the same |
| 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 |
| EP1870795A2 (en) * | 2006-06-20 | 2007-12-26 | Forcar Co., Ltd. | Power source connecting circuit device with current transformer |
| CN101409467A (en) * | 2008-11-26 | 2009-04-15 | 上海电器科学研究所（集团）有限公司 | Circuit breaker controller |
| WO2010101415A2 (en) * | 2009-03-03 | 2010-09-10 | 주식회사 엘지화학 | Apparatus and method for controlling a relay of a hybrid electric vehicle |
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| CN102306483B (en) | 2014-04-09 |
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