CN201039545Y - A power limited circuit - Google Patents

A power limited circuit Download PDF

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Publication number
CN201039545Y
CN201039545Y CNU2007200507740U CN200720050774U CN201039545Y CN 201039545 Y CN201039545 Y CN 201039545Y CN U2007200507740 U CNU2007200507740 U CN U2007200507740U CN 200720050774 U CN200720050774 U CN 200720050774U CN 201039545 Y CN201039545 Y CN 201039545Y
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China
Prior art keywords
circuit
power
resistance
control chip
power supply
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Expired - Fee Related
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CNU2007200507740U
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Chinese (zh)
Inventor
樊邦弘
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Heshan Lide Electronic Enterprise Co Ltd
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Heshan Lide Electronic Enterprise Co Ltd
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Priority to CNU2007200507740U priority Critical patent/CN201039545Y/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

The utility model belongs to a circuit used for limiting the power and belongs to the technical field of electricity. The circuit is mainly used for controlling the power of an incandescent lamp within preset constant limited power. The circuit adopts two diodes which are reversely connected in parallel to be connected in series with an electric resistor as an electric current sampler, so as to control the comparison between the received sampling voltage value and reference voltage value of a chop. Furthermore, by transmitting controlling signal to drive the conductivity of a controllable silicon, the circuit also can control the contacting points connecting statuses inside an electric relay and further control the connection and disconnection between an input and an output. Based on the controlling process and the technical property, the utility model avoids the application of incandescent lamp, the power of which is beyond the constant limited power, thus meeting the requirement of lawful energy conservation of the places such as America and Europe. Furthermore, the utility model also has compensation to temperature, comparatively steady circuit operation. The completely detecting and controlling functions can be better realized simply by using the structure of a double running-layouts circuit.

Description

A kind of circuit of power-limiting
Affiliated technical field
The utility model belongs to the electroporation field, particularly relates to the circuit that control incandescent light fitting power is no more than a kind of power-limiting of predefined rated power.
Background technology
Tradition control or drive the circuit of incandescent light fitting does not generally all limit the power of load incandescent lamp bulb and protects.When incandescent lamp bulb or the incandescent lamp bulb of being installed being installed breaking down, if we do not know the model or the watt level of incandescent lamp bulb, mistake load onto or change than the excessive incandescent lamp bulb of actual set power the time, electric current on the power transmission line is increased, cause incandescent lamp bulb to break down or circuit burns out, even dangerous situation on fire takes place, and some incandescent lamp bulb costs an arm and a leg, not only waste resource, improved cost, and have very serious potential safety hazard.
At present; at above shortcoming; there is the user that a kind of new technical scheme is provided; design the unfavorable condition generation that a kind of control load incandescent lamp bulb power raises and brought; use coil as sample circuit; when bearing power raises; the pressure drop at coil two ends will raise; give central controlled circuit with the Voltage Feedback that raises; this circuit is through processing, and the control signal effect of sending is controlled the disconnection of its power transmission line and load to outside associated circuits; thereby other dangerous situation of having protected the incandescent lamp bulb life-span and may having produced takes place, and this technology also is the current more general a kind of mode that adopts on the market.But, the weak point of this technology is: coil is subjected to Temperature Influence bigger, and when energising, coil current increases, temperature rises very fast, the pressure drop at coil two ends also can be along with rising, and if so, central controlled circuit will send the disconnection that signal goes to control output and load, cause and produce wrong action, cause incandescent lamp bulb not work, and this technology is not provided with temperature-compensation circuit, the circuit working instability.
Summary of the invention
There is mirror therewith, the purpose of this utility model is to have temperature compensation characteristic, circuit working is more stable and only uses the double operational line construction just can well finish the circuit of the power-limiting of whole Detection ﹠ Controling functions in order to solve the above-mentioned problem that proposes, to provide a kind of.
To achieve these goals, the technical scheme that the utility model adopted is a kind of circuit of power-limiting, it is characterized in that: this circuit comprises:
Relay is used to control the break-make between input and the output;
Controllable silicon is used for control relay and is switched to normally opened contact by normally-closed contact;
Control chip carries out the comparison of sample voltage value and reference voltage value, and drives the silicon controlled conducting;
Current sampler is gathered the output loop electric current and the Voltage Feedback of sample circuit is given the sampling end of control chip;
DC power supply is used for to control chip power supply and reference voltage value is provided.
Described current sampler is composed in series by the diode of two parallel resistor R11, R12 and two reverse parallel connections, one end order links to each other with the other end by diode D7 and resistance R 15, R18, R14 and is connected to the negative pole end of DC power supply, be connected between 3 pin of described control chip U2 and resistance R 14 and the R18,3 pin of three terminal regulator U1 orders is connected to the negative pole end of DC power supply by resistance R 5 and R13 in the described DC power supply, is connected between 2 pin of described control chip U2 and resistance R 5 and the resistance R 13.
Described circuit comprises reset circuit.
Described reset circuit comprises electrochemical capacitor, resistance and reset switch, and is in parallel with electrochemical capacitor behind the resistance series connection reset switch, and an end of its reset circuit is connected to the silicon controlled control utmost point, and the other end is connected with the negative pole end of DC power supply.
The described silicon controlled control utmost point is connected to the output of control chip by resistance and diode, and anode is connected with relay, and negative electrode is connected with the negative pole end of DC power supply.
The rated limits power of described load is more than or equal to 190W, the 3 pin voltage U of three terminal regulator U1 in the DC power supply 3=15V, resistance R 11//R12=0.175 Ω, R15+R18=13K Ω, R14=47K Ω, R13=180 Ω, R5=6.2K Ω.
Described load is an incandescent lamp bulb.
Described controllable silicon is an one-way SCR.
Described control chip is a dual operational amplifier.
The utility model compared with prior art, its beneficial effect is:
1, utilize current sampler as sample circuit, it is very little to detect temperature influence, can not make the voltage that exports sampling end to produce sudden change, causes control chip that misoperation is sent in load.
2, resistance one end of while in sample circuit also is in series with the diode of two reverse parallel connections, not only makes sampling more accurate, and can suppress the moment property sudden change of electric current, has good temperature compensation characteristic.
3, adopt the integrated dual operational amplifier of two comparators as kernel control chip, go to control the conducting of one-way SCR, its detection and control are more accurate, and performance and price are more outstanding, and circuit working is also very stable.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Is the function and benefit of further understanding architectural feature of the present utility model in depth and can reach, now enumerates specific embodiment, and detailed introduction of conjunction with figs. is described as follows:
A kind of circuit of power-limiting, the power that is mainly used in the incandescent lamp bulb that control load connects is no more than the rated limits power that sets in advance.As shown in Figure 1, comprise that ac input division divides 1, the one end respectively with an end that exchanges output 6, the input of DC power supply part 2, and control transformation, reset and move display part 5 and connect, ac input division divides 1 the other end to connect the input of sampling section 3, the input of the output connection control signal processing section 4 of DC power supply part 2, the output of control signal processing section 4 respectively with sampling section 3 and control transformation, reset and move display part 5 and connect, the output of sampling section 3 connects control transformation, reset and move display part 5, control transformation, reset and move the output of display part 5 and be connected with the other end that exchanges output 6.
Again in conjunction with Fig. 1, shown in Figure 2, when the power of load incandescent lamp bulb during less than rated limits power, the alternating current that divides 1 input 120VAC/60Hz by ac input division, one end directly is connected with an end (or positive terminal of incandescent lamp bulb) that exchanges output 6 behind fuse F1, behind other end order series resistance R12 and the diode D6, the normally-closed contact by relay K 1 is connected with the other end (or negative pole end of incandescent lamp bulb) of interchange output 6.
When the power of load incandescent lamp bulb during more than or equal to rated limits power, the alternating current that is divided 1 input 120VAC/60Hz by ac input division is through DC power supply part 2 its DC power supply of output, give control chip U2 and other circuit supply, and provide one simultaneously for reference voltage value relatively.Wherein, the protective circuit that described DC power supply part 2 is made of capacitor C 1, C2, piezo-resistance R17, resistance R 2, the filter circuit that the protective circuit of voltage regulation that the rectification circuit that diode D1, D3 constitute, voltage stabilizing didoe D8, D9, three terminal regulator U1 constitute, electrochemical capacitor C7, C8, capacitor C 3 constitute is formed.
Simultaneously, in case the power of load incandescent lamp bulb surpasses rated limits power, the electric current that connects relay K 1 output loop raises, electric current flows through sampling section 3, raise by the diode D5 of two reverse parallel connections of connecting again after resistance R 11, the R12 parallel connection, the current sampler two ends pressure drop that D6 constitutes, thereby make the diode D7 conducting that is connected sampling section 3 one ends, order links to each other with the other end by resistance R 15, adjustable resistance R18, resistance R 14 and is connected to the negative pole end of DC power supply again, is connected between 3 pin of described control chip U2 and resistance R 14 and the R18; 3 pin of described three terminal regulator U1 order is connected to the negative pole end of DC power supply by resistance R 5 and R13, is connected between 2 pin of described control chip U2 and resistance R 5 and the resistance R 13, and 2 pin of the reference voltage of a confession comparison to control chip U2 are provided.To the sample voltage and the reference voltage that are obtained of control chip U2 made comparisons, when the voltage of sampling end 3 pin is higher than reference edge 2 pin voltages, output 7 human hair combing wastes of control chip U2 go out a voltage signal, after diode D2, resistance R 3, be connected with the control utmost point of controllable silicon Q1, and the negative electrode of controllable silicon Q1 own is connected with the negative pole end of DC power supply, and anode is connected with the positive terminal of DC power supply by diode D10.When voltage signal acts on control when extremely going up, trigger controllable silicon Q1 conducting immediately, and the anode of controllable silicon Q1 is connected with relay K 1, controllable silicon Q1 conducting, also conducting of relay K 1 is flow through certain electric current in relay K 1 Inside coil, produce galvanomagnetic effect, the inside of relay K 1 will turn to normally opened contact by normally-closed contact under the effect of electromagnetic attracting force, thus being electrically connected between disconnecting input and exporting.
When the power of load incandescent lamp bulb returns in the rated limits power once more, reset switch S1 in the manual closing reset circuit, voltage on the electrochemical capacitor C10, the control voltage that also is controllable silicon Q1 discharges by resistance R 19, the voltage of extremely going up when the control of controllable silicon Q1 is during less than the voltage of controllable silicon Q1 conducting, and controllable silicon Q1 turn-offs, and relay K 1 inner contact can be forwarded on the normally-closed contact by normally opened contact again, input is connected with output, and the load incandescent lamp bulb continues operate as normal.
Below, equaling 190W with power is that the zero boundary point of action protection is that example is introduced several execution modes of the utility model:
Embodiment 1, resistance R 11//R12=0.175 Ω, R15+R18=13K Ω, R14=47K Ω, R13=180 Ω, R5=6.2 K Ω, the 3 pin voltage U of three terminal regulator U1 3=15V, at this moment, the 2 pin voltage U of control chip U2 2=200mv; When the power of load incandescent lamp bulb equaled 190W, the electric current of load equaled 1.5 ± 0.03A, the sampled voltage U of 3 pin of control chip U2 3=0.4V is greater than 2 pin voltage U 2(200mv); output 7 human hair combing wastes of control chip U2 go out a voltage signal and give controllable silicon Q1; trigger controllable silicon Q1 conducting; and then also conducting of relay K 1, flow through certain electric current in relay K 1 Inside coil, produce galvanomagnetic effect; the inside of relay K 1 will be under the effect of electromagnetic attracting force; turn to normally opened contact by normally-closed contact, thereby be electrically connected protective circuit and load between disconnecting input and exporting.
Embodiment 2, in like manner, and resistance R 11//R12=1m Ω, R15+R18=13K Ω, R14=47K Ω, R13=180 Ω, R5=6.2K Ω, the 3 pin voltage U of three terminal regulator U1 3=15V, at this moment, the 2 pin voltage U of control chip U2 2=1.175mv; When the power of load incandescent lamp bulb equaled 190W, the electric current of load equaled 1.5 ± 0.03A, the sampled voltage U of 3 pin of control chip U2 3Greater than 2 pin voltage U 2(1.175mv); output 7 human hair combing wastes of control chip U2 go out a voltage signal and give controllable silicon Q1; trigger controllable silicon Q1 conducting; and then also conducting of relay K 1, flow through certain electric current in relay K 1 Inside coil, produce galvanomagnetic effect; the inside of relay K 1 will be under the effect of electromagnetic attracting force; turn to normally opened contact by normally-closed contact, thereby be electrically connected protective circuit and load between disconnecting input and exporting.
Embodiment 3, in like manner, and resistance R 11//R12=10m Ω, R15+R18=13K Ω, R14=47K Ω, R13=180 Ω, R5=6.2K Ω, the 3 pin voltage U of three terminal regulator U1 3=15V, at this moment, the 2 pin voltage U of control chip U2 2=11.75mv; When the power of load incandescent lamp bulb equaled 190W, the electric current of load equaled 1.5 ± 0.03A, the sampled voltage U of 3 pin of control chip U2 3Greater than 2 pin voltage U 2(11.75mv); output 7 human hair combing wastes of control chip U2 go out a voltage signal and give controllable silicon Q1; trigger controllable silicon Q1 conducting; and then also conducting of relay K 1, flow through certain electric current in relay K 1 Inside coil, produce galvanomagnetic effect; the inside of relay K 1 will be under the effect of electromagnetic attracting force; turn to normally opened contact by normally-closed contact, thereby be electrically connected protective circuit and load between disconnecting input and exporting.
Embodiment 4, in like manner, and resistance R 11//R12=1 Ω, R15+R18=13K Ω, R14=47K Ω, R13=180 Ω, R5=6.2 K Ω, the 3 pin voltage U of three terminal regulator U1 3=15V, at this moment, the 2 pin voltage U of control chip U2 2=1.175v; When the power of load incandescent lamp bulb equaled 190W, the electric current of load equaled 1.5 ± 0.03A, the sampled voltage U of 3 pin of control chip U2 3Greater than 2 pin voltage U 2(1.175v); output 7 human hair combing wastes of control chip U2 go out a voltage signal and give controllable silicon Q1; trigger controllable silicon Q1 conducting; and then also conducting of relay K 1, flow through certain electric current in relay K 1 Inside coil, produce galvanomagnetic effect; the inside of relay K 1 will be under the effect of electromagnetic attracting force; turn to normally opened contact by normally-closed contact, thereby be electrically connected protective circuit and load between disconnecting input and exporting.
Embodiment 5, in like manner, and resistance R 11//R12=10 Ω, R15+R18=13K Ω, R14=47K Ω, R13=180 Ω, R5=6.2K Ω, the 3 pin voltage U of three terminal regulator U1 3=15V, at this moment, the 2 pin voltage U of control chip U2 2=11.75mv; When the power of load incandescent lamp bulb equaled 190W, the electric current of load equaled 1.5 ± 0.03 A, the sampled voltage U of 3 pin of control chip U2 3Greater than 2 pin voltage U 2(11.75mv); output 7 human hair combing wastes of control chip U2 go out a voltage signal and give controllable silicon Q1; trigger controllable silicon Q1 conducting; and then also conducting of relay K 1, flow through certain electric current in relay K 1 Inside coil, produce galvanomagnetic effect; the inside of relay K 1 will be under the effect of electromagnetic attracting force; turn to normally opened contact by normally-closed contact, thereby be electrically connected protective circuit and load between disconnecting input and exporting.
Below; equaling 380W with power again is that example is introduced several execution modes of the utility model as action protection 1 boundary's point: resistance R 11//R12=0.175 Ω, R15+R18=13K Ω, R14=47K Ω, R13=201 Ω, R5=6.2K Ω, the 3 pin voltage U of three terminal regulator U1 3=15V, at this moment, the 2 pin voltage U of control chip U2 2=200mv; When the power of load incandescent lamp bulb equaled 380W, the electric current of load equaled 1.5 ± 0.03A, the sampled voltage U of 3 pin of control chip U2 3=0.4V is greater than 2 pin voltage U 2(200mv); output 7 human hair combing wastes of control chip U2 go out a voltage signal and give controllable silicon Q1; trigger controllable silicon Q1 conducting; and then also conducting of relay K 1, flow through certain electric current in relay K 1 Inside coil, produce galvanomagnetic effect; the inside of relay K 1 will be under the effect of electromagnetic attracting force; turn to normally opened contact by normally-closed contact, thereby be electrically connected protective circuit and load between disconnecting input and exporting.
Below; equaling 100W with power again is that example is introduced several execution modes of the utility model as action protection 1 boundary's point: resistance R 11//R12=0.175 Ω, R15+R18=13K Ω, R14=47K Ω, R13=45 Ω, R5=6.2K Ω, the 3 pin voltage U of three terminal regulator U1 3=15V, at this moment, the 2 pin voltage U of control chip U2 2=200mv; When the power of load incandescent lamp bulb equaled 100W, the electric current of load equaled 1.5 ± 0.03A, the sampled voltage U of 3 pin of control chip U2 3=0.4V is greater than 2 pin voltage U 2(200mv); output 7 human hair combing wastes of control chip U2 go out a voltage signal and give controllable silicon Q1; trigger controllable silicon Q1 conducting; and then also conducting of relay K 1, flow through certain electric current in relay K 1 Inside coil, produce galvanomagnetic effect; the inside of relay K 1 will be under the effect of electromagnetic attracting force; turn to normally opened contact by normally-closed contact, thereby be electrically connected protective circuit and load between disconnecting input and exporting.
Among the above embodiment, the resistance R 15 of described series connection and resistance R 18 also can be a resistance, but, because can there be certain error in resistance in the process of making, in order to obtain accurate sampled voltage, preferred R18 is a semifixed resistor, make finished product after, if total resistance of resistance R 15 and resistance R 18 can be by regulating resistance R 18 accurately near design load not in the scope of design the time.Consider from the working stability aspect of cost and circuit that again preferred control chip U2 is two dual operational amplifiers that comparator is integrated, the preferred one-way SCR of controllable silicon Q1.
In sum, the utility model provides a kind of circuit of power-limiting, through actual fabrication, finish and test repeatedly after, reached the desired purpose of the utility model, solved existing weak point in the prior art effectively.Yet, more than the specific embodiment of lifting only be that technical characterictic of the present utility model and technology contents are described in further detail, shown in accompanying drawing only for reference with the explanation usefulness, be not to be used for the utility model is limited.

Claims (9)

1. the circuit of a power-limiting, it is characterized in that: this circuit comprises:
Relay is used to control the break-make between input and the output;
Controllable silicon is used for control relay and is switched to normally opened contact by normally-closed contact;
Control chip carries out the comparison of sample voltage value and reference voltage value, and drives the silicon controlled conducting;
Current sampler is gathered the output loop electric current and the Voltage Feedback of sample circuit is given the sampling end of control chip;
DC power supply is used for to control chip power supply and reference voltage value is provided.
2. the circuit of power-limiting according to claim 1, it is characterized in that: described current sampler is by two parallel resistor R11, the diode of R12 and two reverse parallel connections is composed in series, the one end is in proper order by diode D7 and resistance R 15, R18, R14 links to each other with the other end and is connected to the negative pole end of DC power supply, be connected between 3 pin of described control chip U2 and resistance R 14 and the R18,3 pin of three terminal regulator U1 orders is connected to the negative pole end of DC power supply by resistance R 5 and R13 in the described DC power supply, is connected between 2 pin of described control chip U2 and resistance R 5 and the resistance R 13.
3. the circuit of power-limiting according to claim 1, it is characterized in that: described circuit comprises reset circuit.
4. the circuit of power-limiting according to claim 3, it is characterized in that: described reset circuit comprises electrochemical capacitor, resistance and reset switch, in parallel behind the resistance series connection reset switch with electrochemical capacitor, one end of its reset circuit is connected to the silicon controlled control utmost point, and the other end is connected with the negative pole end of DC power supply.
5. the circuit of power-limiting according to claim 1 is characterized in that: the described silicon controlled control utmost point is connected to the output of control chip by resistance and diode, and anode is connected with relay, and negative electrode is connected with the negative pole end of DC power supply.
6. the circuit of power-limiting according to claim 2 is characterized in that: the rated limits power of described load is more than or equal to 190W, the 3 pin voltage U of three terminal regulator U1 in the DC power supply 3=15V, resistance R 11//R12=0.175 Ω, R15+R18=13K Ω, R14=47K Ω, R13=180 Ω, R5=6.2K Ω.
7. the circuit of power-limiting according to claim 6, it is characterized in that: described load is an incandescent lamp bulb.
8. the circuit of power-limiting according to claim 1 or 5, it is characterized in that: described controllable silicon is an one-way SCR.
9. the circuit of power-limiting according to claim 1 and 2, it is characterized in that: described control chip is a dual operational amplifier.
CNU2007200507740U 2007-04-25 2007-04-25 A power limited circuit Expired - Fee Related CN201039545Y (en)

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Application Number Priority Date Filing Date Title
CNU2007200507740U CN201039545Y (en) 2007-04-25 2007-04-25 A power limited circuit

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104102269A (en) * 2014-07-20 2014-10-15 苏州塔可盛电子科技有限公司 Novel power limiting circuit
CN107997601A (en) * 2016-10-31 2018-05-08 芜湖美的厨卫电器制造有限公司 Instant heating type heating unit and its control method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104102269A (en) * 2014-07-20 2014-10-15 苏州塔可盛电子科技有限公司 Novel power limiting circuit
CN107997601A (en) * 2016-10-31 2018-05-08 芜湖美的厨卫电器制造有限公司 Instant heating type heating unit and its control method
CN107997601B (en) * 2016-10-31 2020-08-07 芜湖美的厨卫电器制造有限公司 Instant heating type heating device and control method thereof

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Granted publication date: 20080319

Termination date: 20100425