CN101093936B - Device for cutting off voltage of abnormal power supply - Google Patents
Device for cutting off voltage of abnormal power supply Download PDFInfo
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- CN101093936B CN101093936B CN200610027807XA CN200610027807A CN101093936B CN 101093936 B CN101093936 B CN 101093936B CN 200610027807X A CN200610027807X A CN 200610027807XA CN 200610027807 A CN200610027807 A CN 200610027807A CN 101093936 B CN101093936 B CN 101093936B
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Abstract
The cut off device can detect abnormal source voltage of power supply apparatus and cut off abnormal source voltage of causing destroying power line. The disclosed device can carry out rectifying and stabilizing flow for AC source voltage as well as can convert and control electrical source supplied from transformer according to switch of pulse amplitude modification. The cut off device is composed of following parts: voltage detection part capable of detecting abnormal voltage state of source voltage; switch circuit for cutting off switch of pulse amplitude modification based on the detectedabnormal voltage state detected by the voltage detection part. If detecting that external AC voltage is in over loading state, the cut off device cuts off the over loading voltage so as to prevent components from damaging caused by abnormal voltage supply.
Description
Technical field
The present invention relates to device for cutting off voltage of abnormal power supply, relate in particular to a kind of device for cutting off voltage of abnormal power supply that can cut off the moment overload voltage/low pressure that produces unusually because of external power source.
Background technology
Generally speaking, in household electrical appliance such as TV or audio equipment, DVD player, refrigerator, washing machine, built-in power feedway by various household electrical appliance inside provides power supply to carry out all operations of instrument, for more stable power is provided, just used suitable SMPS (switching mode power supply: the power supplier switched-mode power supply feedway).
As shown in Figure 1, this power supplier is by having the rectification part 10 that a bridge diode (bridge diode) and an interchange AC power supplies are transformed into direct current DC power supply; Can remove current stabilization portion 20 with the fluctuation composition of stable DC electric current; The dc voltage conversion of current stabilization is become the transformer 30 of the essential voltage of machine operation line scan pickup coil side; The PWM IC 40 that the transformation operation of above-mentioned transformer is controlled in the mode of pulse-width modulation (PWM:pulse width modulation) constitutes.
In the power supplier of prior art,, the higher PWM IC 40 of interior pressure or standby (relay) circuit have just been used in order to tackle outside abnormal voltage.But be to use this PWM IC 40 or extension wire can cause the rising of cost, there is the shortcoming that there is no need to use in the stable area of power supply this power supplier in it.
In addition,,, the interior pressure of the PWM IC that allows SMPS will occur surpassing or overload current takes place according to moment overload voltage or low pressure in the unstable area of supply voltage or with the area of generator drive power supply, thus the problem of destruction PWM IC.
Summary of the invention
The present invention proposes for addressing the above problem just, and its purpose is to provide a kind of abnormal voltage that detects power supplier, and can cut off the device for cutting off voltage of abnormal power supply of the infringement that abnormal voltage causes power circuit.
To achieve these goals, device for cutting off voltage of abnormal power supply of the present invention, it is applicable to AC supply voltage is carried out rectification and current stabilization and the power supplier of supply power on the transformer of foundation pwm switch conversion and control, be characterized in that this device for cutting off voltage of abnormal power supply comprises: the voltage detecting parts that detect the abnormal voltage state of above-mentioned AC supply voltage; The switching circuit that the abnormal voltage that detects according to above-mentioned voltage detecting parts cuts off the switching manipulation of above-mentioned pwm switch; Wherein, described voltage detecting parts comprise:
The above-mentioned AC supply voltage of dividing potential drop, and the first voltage distribution portion of output regulation alternating voltage;
The regulation alternating voltage that the first above-mentioned voltage distribution is partly pressed is to the ac/dc transformation component of regulation dc voltage conversion;
Afore mentioned rules direct voltage and normal voltage are compared, and produce the comparator of outputting standard signal, wherein, described outputting standard signal is input to described switching circuit according to its comparative result.。
Effect of the present invention:
In sum, device for cutting off voltage of abnormal power supply of the present invention if detect the state that outside alternating voltage is in the overload input, is just controlled the switching manipulation of PWM IC in power supplier, to cut off the input of overload voltage.Therefore, can reach the effect that prevents to cause component wear because of the abnormal voltage supply.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the schematic diagram that the power supplier of prior art constitutes;
Fig. 2 is the schematic diagram that device for cutting off voltage of abnormal power supply of the present invention constitutes;
Fig. 3 is the detailed figures that the circuit of Fig. 2 constitutes.
The symbol description of major part in the accompanying drawing:
10: rectification part 20: current stabilization portion
30: transformer 40:PWM IC
50,90: the 1, the 2nd voltage distribution portion 60: ac/dc transformation component
70: comparator 80: switching circuit
Embodiment
Embodiment to device for cutting off voltage of abnormal power supply of the present invention is elaborated below with reference to accompanying drawings.
Fig. 2 is the schematic diagram that device for cutting off voltage of abnormal power supply of the present invention constitutes.
As shown in Figure 2, abnormal voltage shearing device of the present invention is by rectification part 10; Current stabilization portion 20; Transformer 30; PWM IC 40; The 1st voltage distribution portion 50; Ac/dc transformation component 60; Comparator 70; Switching circuit 80; The 2nd voltage distribution portion 90 formations such as grade.
Above-mentioned the 1st voltage distribution portion 50 is connected between above-mentioned interchange AC voltage input end and the rectification part 10, it when distributing alternating voltage, the voltage of exportable regulation.Above-mentioned ac/dc transformation component 60 becomes direct voltage (Vsense) to the regulation AC voltage conversion of distributing according to above-mentioned the 1st voltage distribution portion 50.
It is low that above-mentioned comparator 70 compares the regulation direct voltage (Vsense) of the normal voltage of above-mentioned the 2nd voltage distribution portion 90 (Verf) and above-mentioned AC/DC transformation component 60, and generates output according to its comparative result " height " or " " standard signal (H/L).
Above-mentioned switching circuit 80 is changed according to the outputting standard signal of above-mentioned comparator 70, and the conversion operations of control said PWM IC 40.
Above-mentioned the 2nd voltage distribution portion 90 is connected between above-mentioned current stabilization portion 20 and the transformer 30, and can distribute the direct voltage of current stabilization portion 20, produce normal voltage (Verf) simultaneously, above-mentioned normal voltage (Verf) can be set in its maximum output voltage (for example 5 volts) value scope arbitrarily according to the voltage of restriction.
Afterwards, the detailed figures that Fig. 3 constitutes as Fig. 2 circuit, above-mentioned the 1st voltage distribution portion 50 is by the divider resistance at the ac input end two ends that connect above-mentioned rectification part 10, and promptly the 1st resistance R the 1, the 2nd resistance R 2 constitutes.Above-mentioned ac/dc transformation component 60 is made of the photoelectrical coupler (photocoupler) that AC voltage conversion is become direct voltage.
The non-output that returns electric terminal (+) and above-mentioned ac/dc transformation component 60 of comparator is connected, it returns electric terminal (-) and the divider resistance that constitutes above-mentioned the 2nd voltage distribution portion 90, promptly the 3rd resistance R the 3, the 4th resistance R 4 links connect, so, it is low that above-mentioned comparator 70 compares afore mentioned rules direct voltage (Vsense) and normal voltage (Verf), to produce " height " or " " outputting standard voltage signal (H/L).
Above-mentioned switching circuit 80 is connected with the output of above-mentioned comparator 70 through the 5th resistance R b by its base stage, its collector electrode is connected with the Vcc end of said PWM IC40, and change according to the standard signal of comparator 70, simultaneously low with " height " or " " the standard Vcc that generates said PWM IC40 hold, also the switching transistor Q1 of the conversion operations of may command PWM IC40 constitutes, and its emitter is through the 6th resistance R e ground connection.
Above-mentioned the 1st voltage distribution portion 50, ac/dc transformation component 60, comparator 70 are formed the voltage detecting parts of the abnormal voltage state that detects above-mentioned supply voltage.
With reference to chart operation of the present invention is elaborated below.
At first, divider resistance R1, R2 according to the 1st voltage distribution portion 50 carry out dividing potential drop to exchanging AC voltage, if produce the regulation alternating voltage, on the photoelectrical coupler of ac/dc transformation component 60, just the alternating voltage of above-mentioned dividing potential drop is changed to the direct voltage (Vsense) of regulation.
In this state, the divider resistance of foundation the 2nd voltage distribution portion 90 in comparator 70, promptly the 3rd resistance R the 3, the 4th resistance R 4 is carried out dividing potential drop, and normal voltage (Verf) that generates and the afore mentioned rules direct voltage (Vsense) that returns electric terminal (-) input compared, produce the outputting standard signal according to its comparative result.Alternating voltage is externally just exported the standard signal of " height " with under the overload voltage situation about importing in above-mentioned comparator 70.
Then, on the switching transistor Q1 of switching circuit 80, standard signal is opened switch according to " height " of the overload voltage detecting of above-mentioned comparator 70 by the input of its base stage, the standard signal of the Vcc end generation " low " of the PWM IC 40 that connects by its collector electrode.
In view of the above, according to " low " standard that said PWM IC 40 generates at its Vcc end,, thereby cut off the overload voltage that above-mentioned transformer 30 is supplied with regard to the operation of terminating switch.
In addition, if above-mentioned alternating-voltage stabilization is just exported " low " standard signal in the above-mentioned comparator 70, because the switching transistor Q1 of above-mentioned switching circuit 80 is in closed condition, therefore, in the switching manipulation of carrying out said PWM IC 40, can supply with normal power supply by transformer 80.
Technology type of the present invention is not limited in the foregoing description to be narrated, and those skilled in the art can carry out various change and modification to the present invention fully in the scope that does not depart from the technology of the present invention thought.But those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (4)
1. device for cutting off voltage of abnormal power supply, its be applicable to AC supply voltage carry out rectification and current stabilization and on the transformer of foundation pwm switch conversion and control the power supplier of supply power, it is characterized in that described device for cutting off voltage of abnormal power supply comprises with lower member:
Detect the voltage detecting parts of the abnormal voltage state of above-mentioned AC supply voltage;
Detect the switching circuit of the switching manipulation of cutting off above-mentioned pwm switch according to the abnormal voltage of above-mentioned voltage detecting parts;
Wherein, described voltage detecting parts comprise:
The above-mentioned AC supply voltage of dividing potential drop, and the first voltage distribution portion of output regulation alternating voltage;
The regulation alternating voltage that the first above-mentioned voltage distribution is partly pressed is to the ac/dc transformation component of regulation dc voltage conversion;
Afore mentioned rules direct voltage and normal voltage are compared, and produce the comparator of outputting standard signal, wherein, described outputting standard signal is input to described switching circuit according to its comparative result.
2. device for cutting off voltage of abnormal power supply as claimed in claim 1 is characterized in that:
Described ac/dc transformation component is made of photoelectrical coupler.
3. device for cutting off voltage of abnormal power supply as claimed in claim 1 is characterized in that:
Described voltage detecting parts also comprise above-mentioned AC supply voltage are carried out rectification and current stabilization and the direct voltage that obtains carries out dividing potential drop, and produce the second voltage distribution portion of the normal voltage of above-mentioned comparator.
4. device for cutting off voltage of abnormal power supply as claimed in claim 1 is characterized in that:
Described switching circuit is made up of the outputting standard signal of the above-mentioned comparator of input and the conversioning transistor of changing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610027807XA CN101093936B (en) | 2006-06-19 | 2006-06-19 | Device for cutting off voltage of abnormal power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610027807XA CN101093936B (en) | 2006-06-19 | 2006-06-19 | Device for cutting off voltage of abnormal power supply |
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| Publication Number | Publication Date |
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| CN101093936A CN101093936A (en) | 2007-12-26 |
| CN101093936B true CN101093936B (en) | 2010-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610027807XA Expired - Fee Related CN101093936B (en) | 2006-06-19 | 2006-06-19 | Device for cutting off voltage of abnormal power supply |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872958B (en) * | 2010-01-14 | 2012-05-30 | 杭州海康威视数字技术股份有限公司 | Input voltage under-voltage protection circuit of switching power supply |
| KR101970551B1 (en) | 2011-12-26 | 2019-04-22 | 엘지디스플레이 주식회사 | Circuit for generating driving voltage of light emitting display device and method for driving the same |
| CN104218520B (en) * | 2013-05-30 | 2017-03-29 | 海洋王（东莞）照明科技有限公司 | Isolated overvoltage crowbar and light fixture |
| CN107947123A (en) * | 2017-10-24 | 2018-04-20 | 深圳市必易微电子有限公司 | ACDC protective circuit of switch power source and ACDC switching power units |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5771162A (en) * | 1996-04-25 | 1998-06-23 | Samsung Electronics Co., Ltd. | Electric protective device used in switching mode power supply systems |
| US6229681B1 (en) * | 1998-03-07 | 2001-05-08 | Samsung Electronics Co., Ltd. | Switching mode power supply apparatus having a low voltage protection circuit |
| CN1379536A (en) * | 2001-03-29 | 2002-11-13 | 夏普株式会社 | Switch power source device |
| CN1455981A (en) * | 2001-01-19 | 2003-11-12 | 索尼公司 | Switch power supply device |
| CN1467894A (en) * | 2002-07-13 | 2004-01-14 | 艾默生网络能源有限公司 | Switch power supply under-voltage protecting circuit for preventing starting by mistake and under-voltage protecting method |
| CN2744056Y (en) * | 2004-10-25 | 2005-11-30 | 西南交通大学 | Switch power controller |
-
2006
- 2006-06-19 CN CN200610027807XA patent/CN101093936B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5771162A (en) * | 1996-04-25 | 1998-06-23 | Samsung Electronics Co., Ltd. | Electric protective device used in switching mode power supply systems |
| US6229681B1 (en) * | 1998-03-07 | 2001-05-08 | Samsung Electronics Co., Ltd. | Switching mode power supply apparatus having a low voltage protection circuit |
| CN1455981A (en) * | 2001-01-19 | 2003-11-12 | 索尼公司 | Switch power supply device |
| CN1379536A (en) * | 2001-03-29 | 2002-11-13 | 夏普株式会社 | Switch power source device |
| CN1467894A (en) * | 2002-07-13 | 2004-01-14 | 艾默生网络能源有限公司 | Switch power supply under-voltage protecting circuit for preventing starting by mistake and under-voltage protecting method |
| CN2744056Y (en) * | 2004-10-25 | 2005-11-30 | 西南交通大学 | Switch power controller |
Non-Patent Citations (1)
| Title |
|---|
| JP 平10-4677 A,全文. |
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| CN101093936A (en) | 2007-12-26 |
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