CN103095267A - Power supply delay device for engineering machinery - Google Patents
Power supply delay device for engineering machinery Download PDFInfo
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- CN103095267A CN103095267A CN2012105869442A CN201210586944A CN103095267A CN 103095267 A CN103095267 A CN 103095267A CN 2012105869442 A CN2012105869442 A CN 2012105869442A CN 201210586944 A CN201210586944 A CN 201210586944A CN 103095267 A CN103095267 A CN 103095267A
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Abstract
The invention discloses a power supply delay device for engineering machinery and belongs to the field of electronic techniques. The delay device comprises an engineering machinery power supply start and stop unit, a delay unit, a power supply switch unit and a power supply, wherein the delay unit comprises a delay unit power supply, a delay circuit and an electronic switch, and the delay circuit is connected with the delay unit power supply and the electronic switch; the engineering machinery power supply start and stop unit is connected with the power supply switch unit through the electronic switch; and the power supply is connected to the power supply switch unit. According to the power supply delay device, the delay unit is arranged in the circuit, when a capacitor is charged to a preset voltage value, the electronic switch is turned on, and a circuit of the power supply switch unit is switched on, so that the purpose of power supply delay is achieved, the circuit design is simple, the cost is low, and the service life is long.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of power supply time-delay mechanism of engineering machinery.
Background technology
At present, China's construction machinery industry automatic field control appliance, in needs were delayed time the control system of controlling, great majority adopted mechanical type timing unit or digital timing unit.The digital timing unit that particularly is comprised of single-chip microcomputer or Programmable Logic Controller, because it is regularly accurate, timing arranges conveniently, is widely used in various accurate timings controls.But, mechanical type timing unit of some long-time time-delays or digital timing unit, because its structure is more complicated, cost is higher, in being adapted to the long-time time-delay that timing accuracy is had relatively high expectations is controlled, if be used for requiring little high long-time time-delay to control to timing accuracy, very uneconomical, also there is no need.In order to reach the setting of power supply or electronic circuit time-delay, present delay circuit is all that the saturation conduction principle by diode arranges, and the design of traditional power supply delay circuit is complicated, and components and parts are more, poor reliability and be easy to burn circuit.
Summary of the invention
Complicated in order to solve the design of present delay circuit, the problem of the more and poor reliability of components and parts now provides a kind of power supply time-delay mechanism of engineering machinery.Concrete technical scheme is as follows:
A kind of power supply time-delay mechanism of engineering machinery, described supply unit comprises that the engineering machinery power supply opens and closes unit, delay unit, power switch unit and power supply, wherein, described delay unit comprises delay unit power supply, delay circuit and electronic switch, and described delay circuit connects described delay unit power supply and described electronic switch; Described engineering machinery power supply opens and closes the unit and connects described power switch unit by described electronic switch; Described power supply is connected in described power switch unit;
When the engineering machinery power supply opens and closes the unit and opens described engineering machinery, described delay unit power supply to described delay circuit charging until make described electronic switch conducting, thereby make described power switch unit conducting, access described power supply;
When the engineering machinery power supply opens and closes the unit and closes described engineering machinery, described delay unit power supply cuts off the power supply to described delay circuit, the discharge of described delay circuit is until close described electronic switch, thereby described power switch unit is closed, and disconnects described power supply.
Preferably, described delay circuit is resistance and Capacitance parallel connection circuit, described delay circuit one end ground connection.
Preferably, described electronic switch comprises the first triode, described the first triode is the NPN type, the base stage of described the first triode connects the other end of described delay circuit, the emitter of described the first triode connects described engineering machinery power supply and opens and closes the unit, and the collector electrode of described the first triode connects described power switch unit.
Preferably, described power switch unit comprises switch chip, and the collector electrode of described the first triode connects the Enable Pin of described switch chip.
Preferably, described electronic switch also comprises diode, and described diode is connected between described electric capacity and described triode, the described electric capacity of the anodic bonding of described diode, and negative electrode connects the base stage of described triode.
Preferably, described engineering machinery power supply opens and closes the unit and comprises keying signal input and engineering machinery open-close on-off circuit, described engineering machinery open-close on-off circuit comprises voltage-stabiliser tube and the second triode, described keying signal input is connected to the base stage of described the second triode by described voltage-stabiliser tube, the collector electrode of described the second triode connects the emitter of described the first triode, the grounded emitter of described the second triode.
Preferably, described delay unit also comprises current-limiting resistance, and described current-limiting resistance first end connects described delay unit power supply, and the second end connects described delay circuit.
Preferably, described delay unit is multistage, and the current-limiting resistance first end of next stage delay unit connects the collector electrode of the first triode of upper level delay unit.
Compared with prior art, the power supply time-delay mechanism of the engineering machinery that technique scheme provides has the following advantages: by be provided with delay unit in circuit, to RC parallel circuits capacitor charging during to scheduled voltage, electronic switch is just opened, and the circuit of the switching circuit that switches on power, reach the purpose to the power supply time-delay, not only circuit design is simple, and cost is low, and the life-span is longer.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, during the below will describe embodiment, the accompanying drawing of required use is done to introduce simply, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the time-delay mechanism functional block diagram that provides in the embodiment of the present invention;
Fig. 2 is the time-delay mechanism circuit diagram that provides in the embodiment of the present invention;
Fig. 3 is the another kind of execution mode circuit diagram that provides in the embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
As depicted in figs. 1 and 2, the embodiment of the present invention provides a kind of power supply time-delay mechanism of engineering machinery, described supply unit comprises that the engineering machinery power supply opens and closes unit 1, delay unit 2, power switch unit 3 and power supply 4, wherein, delay unit 2 comprises delay unit power supply 14, delay circuit 6 and electronic switch, and delay circuit connects delay unit power supply 14 and electronic switch; The engineering machinery power supply opens and closes unit 1 and connects power switch unit 3 by electronic switch; Power supply 4 is connected in power switch unit 3;
When the engineering machinery power supply opened and closed unit 1 and opens engineering machinery, 14 pairs of delay circuits chargings of delay unit power supply were until make the electronic switch conducting, thereby made power switch unit 3 conductings, access power supply 4;
When the engineering machinery power supply opened and closed unit 1 and closes engineering machinery, 14 pairs of delay circuits outages of delay unit power supply, delay circuit discharge were until close electronic switch, thereby power switch unit 3 is closed, and disconnected power supply 4.
Preferably, delay circuit 6 is resistance and Capacitance parallel connection circuit, delay circuit 6 one end ground connection.
Preferably, electronic switch comprises that the first triode 8, the first triodes 8 are the NPN type, and the base stage of the first triode 8 connects the other end of delay circuit 2, the emitter of the first triode 8 connects the collector electrode 8 connection power switch unit that the engineering machinery power supply opens and closes unit 1, the first triode.
Preferably, described power switch unit 3 comprises the Enable Pin 9 of the collector electrode connecting valve chip 10 of switch chip 10, the first triodes 8.
Preferably, electronic switch also comprises diode 7, and diode 7 is connected between electric capacity and the first triode 8, the anodic bonding electric capacity of diode 7, and negative electrode connects the base stage of the first triode 8.
Preferably, the engineering machinery power supply opens and closes unit 1 and comprises keying signal input 12 and engineering machinery open-close on-off circuit, engineering machinery open-close on-off circuit comprises voltage-stabiliser tube 13 and the second triode 11, keying signal input 12 is connected to the base stage of the second triode 11 by voltage-stabiliser tube 13, the collector electrode of the second triode 11 connects the emitter of the first triode 8, the grounded emitter of the second triode 11.
Preferably, delay unit also comprises current-limiting resistance 5, and current-limiting resistance 5 first ends connect delay unit power supply 14, the second ends and connect delay circuit 6.
Preferably, delay unit is multistage, and the current-limiting resistance first end of next stage delay unit connects the collector electrode of the first triode of upper level delay unit.
In the circuit that electric capacity and resistance one in parallel form, the resistance R resistance is larger, and delay time is just longer, but limited by bipolar transistor element input resistance, and resistance value can not be too large, and general maximum is no more than tens megaohms.Wherein, the capacity of capacitor C is larger, and delay time is also just longer, but the larger leakage resistance of its capacity is just less, leaks resistance to the impact of delay time for fear of electric capacity, and for long-time delay circuit, capacitor C is generally selected in the scope of several thousand microfarads.Therefore limit by resistance capacitance value span, delay unit can only obtain the time of delay of tens hours, if will obtain the more timer of long delay time, can adopt multistage delay circuit.
As shown in Figure 2, after delay unit power supply 14V powers on, begin electric capacity is charged, the first triode 8 cut-in voltages are U, and diode 7 cut-in voltages are U1.Therefore, in this circuit, when the voltage of diode cathode reached U+U1=U0, the first triode 8 and diode 7 were all opened.The circuit opening time is depended on charge circuit, and required time when the charging voltage at electric capacity two ends reaches U0 is the circuit opening time.The first triode 8 is connected to the level end of power chip 10, and this level end is high level, and this moment, input and the output of power chip did not all produce signal, and power chip is output signal not.Reach the condition unlatching of conducting when triode after, the circuit turn-on that Enable Pin 9 connects, through the second triode 11 ground connection, at this moment the high level of Enable Pin becomes low level, and the input/output terminal of power chip 10 all has signal to produce, power chip work, output signal.Control by the time-delay to power chip, can realize the delay unit power supply to the control of power switch circuit, prevent power chip misoperation before the micro-control unit normal operation.
In delay circuit, according to the span of above-mentioned capacitor charging circuit element, for the delay circuit below delay time 12h, can adopt the single-stage time-delay, for the delay circuit of delay time at 12h to 24h, generally adopt the two-stage time-delay, as shown in Figure 3, by that analogy.
Forming according to the method described above the outstanding advantage of long-time delay circuit is that circuit is simple, cost is low, the life-span is long, if form multistage delay circuit, can obtain in theory the delay time of endless.Its main weak point is that delay precision is lower, and reason is that delay time depends on the resistance of resistance in charge-discharge circuit and the capacity of electric capacity, and the relative errors of conventional, electric-resistance element and capacity cell is more than 5%.Although can adopt the resistance in resistance and potentiometer series connection replacement charging circuit, obtain higher delay precision by regulator potentiometer, but because the resistance of conventional, electric-resistance, potentiometer and the capacity of electric capacity are subjected to the impact of temperature larger, when variation of ambient temperature, still can produce to a certain degree impact to delay time.Therefore, form as stated above long-time delay circuit, generally can only be used for the less demanding application scenario of delay precision, if will be for the occasion that delay precision is had relatively high expectations, charging circuit need adopt the more stable precision resister of the higher temperature performance of price, potentiometer and capacity cell to form.Circuit arrangement of the present invention is simple in structure, and circuit has that antijamming capability is strong, reliability is high, applying flexible, the characteristics such as easy to operate, can adapt to abominable site environment, is applicable in the control circuit of engineering mechanical device.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the supply unit of an engineering machinery, it is characterized in that, described supply unit comprises that the engineering machinery power supply opens and closes unit, delay unit, power switch unit and power supply, wherein, described delay unit comprises delay unit power supply, delay circuit and electronic switch, and described delay circuit connects described delay unit power supply and described electronic switch; Described engineering machinery power supply opens and closes the unit and connects described power switch unit by described electronic switch; Described power supply is connected in described power switch unit;
When the engineering machinery power supply opens and closes the unit and opens described engineering machinery, described delay unit power supply to described delay circuit charging until make described electronic switch conducting, thereby make described power switch unit conducting, access described power supply;
When the engineering machinery power supply opens and closes the unit and closes described engineering machinery, described delay unit power supply cuts off the power supply to described delay circuit, the discharge of described delay circuit is until close described electronic switch, thereby described power switch unit is closed, and disconnects described power supply.
2. the supply unit of engineering machinery according to claim 1, is characterized in that, described delay circuit is resistance and Capacitance parallel connection circuit, described delay circuit one end ground connection.
3. the supply unit of engineering machinery according to claim 2, it is characterized in that, described electronic switch comprises the first triode, described the first triode is the NPN type, the base stage of described the first triode connects the other end of described delay circuit, the emitter of described the first triode connects described engineering machinery power supply and opens and closes unit 1, and the collector electrode of described the first triode connects described power switch unit.
4. the supply unit of engineering machinery according to claim 3, is characterized in that, described power switch unit comprises switch chip, and the collector electrode of described the first triode connects the Enable Pin of described switch chip.
5. the supply unit of engineering machinery according to claim 3, it is characterized in that, described electronic switch also comprises diode, described diode is connected between described electric capacity and described the first triode, the described electric capacity of the anodic bonding of described diode, negative electrode connects the base stage of described the first triode.
6. the supply unit of engineering machinery according to claim 3, it is characterized in that, described engineering machinery power supply opens and closes the unit and comprises keying signal input and engineering machinery open-close on-off circuit, described engineering machinery open-close on-off circuit comprises voltage-stabiliser tube and the second triode, described keying signal input is connected to the base stage of described the second triode by described voltage-stabiliser tube, the collector electrode of described the second triode connects the emitter of described the first triode, the grounded emitter of described the second triode.
7. the supply unit of engineering machinery according to claim 4, is characterized in that, described delay unit also comprises current-limiting resistance, and described current-limiting resistance first end connects described delay unit power supply, and the second end connects described delay circuit.
8. the supply unit of engineering machinery according to claim 7, is characterized in that, described delay unit is multistage, and the current-limiting resistance first end of next stage delay unit connects the collector electrode of the first triode of upper level delay unit.
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| CN201210586944.2A CN103095267B (en) | 2012-12-28 | 2012-12-28 | A kind of power supply time-delay mechanism of engineering machinery |
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| CN201210586944.2A CN103095267B (en) | 2012-12-28 | 2012-12-28 | A kind of power supply time-delay mechanism of engineering machinery |
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| CN103095267B CN103095267B (en) | 2016-10-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202309037U (en) * | 2011-09-28 | 2012-07-04 | 深圳麦格米特电气股份有限公司 | Cycle-by-cycle current protection circuit implemented by discrete devices |
| US20120176177A1 (en) * | 2011-01-07 | 2012-07-12 | Garret Phillips | Switch with improved edge rate control |
| CN202455617U (en) * | 2012-01-30 | 2012-09-26 | 深圳市振邦实业有限公司 | Light-emitting diode (LED) lighting time delay circuit and LED lighting device |
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2012
- 2012-12-28 CN CN201210586944.2A patent/CN103095267B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120176177A1 (en) * | 2011-01-07 | 2012-07-12 | Garret Phillips | Switch with improved edge rate control |
| CN202309037U (en) * | 2011-09-28 | 2012-07-04 | 深圳麦格米特电气股份有限公司 | Cycle-by-cycle current protection circuit implemented by discrete devices |
| CN202455617U (en) * | 2012-01-30 | 2012-09-26 | 深圳市振邦实业有限公司 | Light-emitting diode (LED) lighting time delay circuit and LED lighting device |
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| CN103095267B (en) | 2016-10-12 |
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Denomination of invention: A Power Delay Device for Construction Machinery Effective date of registration: 20221214 Granted publication date: 20161012 Pledgee: China Minsheng Banking Corp Shanghai branch Pledgor: SHANGHAI HUAXING DIGITAL TECHNOLOGY Co.,Ltd. Registration number: Y2022310000372 |