CN202679332U - Digital air switch - Google Patents
Digital air switch Download PDFInfo
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- CN202679332U CN202679332U CN 201220366600 CN201220366600U CN202679332U CN 202679332 U CN202679332 U CN 202679332U CN 201220366600 CN201220366600 CN 201220366600 CN 201220366600 U CN201220366600 U CN 201220366600U CN 202679332 U CN202679332 U CN 202679332U
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Abstract
The utility model provides a digital air switch which comprises a central processing unit (CPU), a power circuit connected with the CPU, a voltage detection circuit, a current detection circuit, a voltage output shifting circuit and an input setting circuit. The digital air switch is totally different from a traditional mechanical type air switch. A full digitalization circuit design is utilized, and therefore functions are more complete and cost is lower. Compared with the traditional mechanical type air switch, the digital air switch has a voltage protection function. When power grid voltage is abnormal, voltage output can be cut off quickly and household appliance equipment can be protected from being impacted by overvoltage or undervoltage of a power grid. The digital air switch has an overcurrent protection function. Overcurrent protection value can be set freely, for instance, the overcurrent protection value can be adjusted within a range from 1 ampere to 15 ampere. The overcurrent protection value is suitable for different loads. When a load current is larger than set value, the voltage output can be cut off quickly. The digital air switch has a surge protection function. When a surge occurs on the power grid, the voltage output can be cut off quickly and household appliances can be protected from being impacted by the surge.
Description
Technical field
The utility model belongs to the power distribution network field of switches, is specifically related to a kind of digital air switch.
Background technology
Air switch is as long as that electric current surpasses the switch that rated current will automatic disconnection in a kind of circuit, and it is very important a kind of electrical equipment in low voltage power distribution network and the electric drive system.Air switch integrates control and multi-protective function, and except finishing contact and minute deenergizing, the short circuit that can also occur circuit or electric equipment, seriously overload and under voltage etc. are protected, and the while also can be for actuating motor continually not.
Traditional air switch generally all is mechanical structure, and the dropout mode has that heat is moving, 3 kinds of electromagnetism and compound dropouts.When general overload occurs in circuit, though overload current can not make the magnetictrip action, can make thermal element produce certain heat, impel bimetal leaf to be heated and be bent upwards, the promotion lever makes to have contact with snap close throws off, and with the main contact disjunction, cuts off the electricity supply.When circuit is short-circuited or during serious overload current, short circuit current surpasses instantaneous trip setting current value, magnetictrip produces enough large suction, with the armature adhesive and clash into lever, make and have contact with rotate axle bed upwards rotation and snap close disengagement, latch under the effect of reaction spring three secondary main contact disjunctions, cut off the electricity supply.The tripping mechanism of switch is a cover linkage.After main contacts passes through the operating mechanism closure, just be locked in the position of combined floodgate by latch hook.If break down in the circuit, then relevant release throws off the latch hook in the tripping mechanism generation effect, so main contacts rapidly disjunction under the effect of retracting spring.
But the current protection value of traditional mechanical air switch can not arrange, and could protect output when load current must be greater than lowest high-current value; The mechanical air switch does not have voltage protection function simultaneously, even line voltage reaches 300V, can not cut off Voltage-output yet; The mechanical air switch does not have surge protection function yet, and the responsive electronic devices and components in most of electric equipment are punctured by the electrical network surge easily, damages household electrical appliance.
The utility model content
The utility model provides a kind of digital air switch for above-mentioned the deficiencies in the prior art, and this number air switch can arrange the current protection value, and has overvoltage protection and surge protection function.
The utility model is achieved by the following technical solution:
A kind of digital air switch is characterized in that, comprising:
One power circuit is used to the CPU power supply;
One voltage detecting circuit for detection of the current voltage value of electrical network, and exports CPU to;
One current detection circuit for detection of the current current value of load, and exports CPU to;
One Voltage-output commutation circuit is used for driving relay adhesive or the disconnection that is connected to load end, makes load energising or outage;
One input arranges circuit, is used for output switch is set, and protective current numerical value is set, and export CPU to;
One CPU is used for the current voltage value of receiver voltage testing circuit detection, the current current value that current detection circuit detects, output switch and the protective current numerical value that input arranges the circuit setting;
When output switch for opening, current current value is less than protective current numerical value, current voltage value value is less than the protection voltage max that sets in advance, current voltage value value is during greater than the protection voltage minimum that sets in advance, CPU trigger voltage output switching circuit drives the relay adhesive, makes the load energising; Otherwise CPU trigger voltage output switching circuit drives relay and disconnects, and makes the load outage;
Power circuit, voltage detecting circuit, current detection circuit, Voltage-output commutation circuit and input arrange circuit and all link to each other with CPU.
Further, described digital air switch also comprises a nixie display circuit that links to each other with CPU, and described nixie display circuit is used for showing the current voltage value of electrical network, current current value and the protective current numerical value of load.
Digital air switch described in the utility model is fully different from traditional mechanical air switch, and it adopts totally digitilized circuit design, and function is more complete, and cost is cheaper.Compare with traditional mechanical air switch, this number air switch has voltage protection function, and when line voltage occurs cutting off rapidly output when unusual, the protection domestic electric appliance is avoided electrical network overvoltage or under-voltage impact; Have overcurrent protection, and the overcurrent protection value can freely arrange (such as regulating at 1 ~ 15A), be fit to different loads, when load current during greater than set point, can cut off rapidly Voltage-output; Have surge protection function, when surge appears in electrical network, can disconnect rapidly output, the protection household electrical appliance are avoided surge impact.
Description of drawings
Fig. 1 is the structured flowchart of digital air switch described in the utility model;
Fig. 2 is the schematic diagram of power circuit;
Fig. 3 is the schematic diagram of voltage detecting circuit;
Fig. 4 is the schematic diagram of current detection circuit;
Fig. 5 is the schematic diagram of Voltage-output commutation circuit;
Fig. 6 is the schematic diagram that CPU and input arrange circuit;
Fig. 7 is the schematic diagram of nixie display circuit.
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the utility model provides a kind of digital air switch, comprise that power circuit, voltage detecting circuit, current detection circuit, Voltage-output commutation circuit, input arrange circuit and CPU, power circuit, voltage detecting circuit, current detection circuit, Voltage-output commutation circuit and input arrange circuit and all link to each other with CPU.
Power circuit is mainly used in the power supply into CPU; As shown in Figure 2, power circuit adopts the mode of capacitance decompression, have wide input voltage range, 0 ~ 300V input, voltage is through the C1 step-down, then pass through D1, the D2 rectification, through electrochemical capacitor E1 filtering, input three terminal integrated voltage stabilizer 78L05 voltage stabilizing after the voltage stabilizing didoe Z1 voltage stabilizing, output 5V direct current is powered to CPU.
Voltage detecting circuit is for detection of the current voltage value of electrical network, and exports CPU to; As shown in Figure 3, electrical network live wire " L " then passes through electric resistance partial pressure through diode 4007, becomes the voltage of 0 ~ 5V, then is input to the voltage that CPU carries out the high-speed sampling electrical network, is calculated the current voltage value of electrical network by the CPU process.Certainly also can adopt other circuit to realize voltage detecting, namely be calculated after the current voltage value of electrical network by voltage detecting circuit, be sent to again CPU.
Current detection circuit is for detection of the current current value of load, and exports CPU to; As shown in Figure 4, load current is input to operational amplifier LM358 by R2 and amplifies through the R4 sampling, and current signal is input to CPU through amplifying, and calculates the size of current of present load through high-speed sampling.Certainly also can adopt other circuit to realize current detecting, namely be calculated after the current current value of electrical network by current detection circuit, be sent to again CPU.
The Voltage-output commutation circuit is used for driving relay adhesive or the disconnection that is connected to load end, makes load energising or outage; As shown in Figure 5, CPU is according to current voltage, size of current, and whether output switch opens or closes the trigger voltage output switching circuit; If open, can drive triode Q1 through R17, make relay K 1 adhesive, conducting N line, load can be switched on.If disconnect, then in addition R17 without input, 1 disconnection of relay K, load outage.
Input arranges circuit, is used for output switch is set, and protective current numerical value is set, and export CPU to; CPU is used for the current voltage value of receiver voltage testing circuit detection, the current current value that current detection circuit detects, output switch and the protective current numerical value that input arranges the circuit setting;
When output switch for opening, current current value is less than protective current numerical value, current voltage value value is less than the protection voltage max that sets in advance, current voltage value value is during greater than the protection voltage minimum that sets in advance, CPU trigger voltage output switching circuit drives the relay adhesive, makes the load energising; Otherwise CPU trigger voltage output switching circuit drives relay and disconnects, and makes the load outage.So can realize voltage protection function and surge protection function, when line voltage occurs cutting off rapidly output when unusual, the protection domestic electric appliance is avoided electrical network overvoltage or under-voltage impact; When surge appears in electrical network, can disconnect rapidly output, the protection household electrical appliance are avoided surge impact.
Be illustrated in figure 6 as the circuit theory diagrams that CPU and input arrange circuit, button S1 is used for arranging whether open or close output, i.e. output switch; Button S2 is used for arranging protective current numerical value.Button S1, S2 all link to each other with cpu chip U1.
For the ease of showing and checking; described digital air switch also comprises a nixie display circuit that links to each other with CPU; as shown in Figure 7; the nixie display circuit is realized man-machine interface by seven segment digital tubes; charactron can show the protective current numerical value of setting when current protection was set, and can show in real time voltage and the current current value of load that electrical network is current during work.
The utility model not only is confined to above-mentioned embodiment; persons skilled in the art are according to the disclosed content of the utility model; can adopt other multiple embodiment to implement the utility model; therefore; every employing project organization of the present utility model and thinking; do some simple designs that change or change, all fall into the scope of the utility model protection.
Claims (2)
1. a digital air switch is characterized in that, comprising:
One power circuit is used to the CPU power supply;
One voltage detecting circuit for detection of the current voltage value of electrical network, and exports CPU to;
One current detection circuit for detection of the current current value of load, and exports CPU to;
One Voltage-output commutation circuit is used for driving relay adhesive or the disconnection that is connected to load end, makes load energising or outage;
One input arranges circuit, is used for output switch is set, and protective current numerical value is set, and export CPU to;
One CPU is used for the current voltage value of receiver voltage testing circuit detection, the current current value that current detection circuit detects, output switch and the protective current numerical value that input arranges the circuit setting;
When output switch for opening, current current value is less than protective current numerical value, current voltage value value is less than the protection voltage max that sets in advance, current voltage value value is during greater than the protection voltage minimum that sets in advance, CPU trigger voltage output switching circuit drives the relay adhesive, makes the load energising; Otherwise CPU trigger voltage output switching circuit drives relay and disconnects, and makes the load outage;
Power circuit, voltage detecting circuit, current detection circuit, Voltage-output commutation circuit and input arrange circuit and all link to each other with CPU.
2. digital air switch according to claim 1; it is characterized in that; described digital air switch also comprises a nixie display circuit that links to each other with CPU, and described nixie display circuit is used for showing the current voltage value of electrical network, current current value and the protective current numerical value of load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220366600 CN202679332U (en) | 2012-07-26 | 2012-07-26 | Digital air switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220366600 CN202679332U (en) | 2012-07-26 | 2012-07-26 | Digital air switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202679332U true CN202679332U (en) | 2013-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220366600 Expired - Fee Related CN202679332U (en) | 2012-07-26 | 2012-07-26 | Digital air switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202679332U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769449A (en) * | 2012-07-26 | 2012-11-07 | 温州宝翔电气有限公司 | Digital air switch |
-
2012
- 2012-07-26 CN CN 201220366600 patent/CN202679332U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769449A (en) * | 2012-07-26 | 2012-11-07 | 温州宝翔电气有限公司 | Digital air switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20150726 |
|
| EXPY | Termination of patent right or utility model |