CN2597996Y - Sampling circuit for 220V ac voltage - Google Patents
Sampling circuit for 220V ac voltage Download PDFInfo
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- CN2597996Y CN2597996Y CNU032229496U CN03222949U CN2597996Y CN 2597996 Y CN2597996 Y CN 2597996Y CN U032229496 U CNU032229496 U CN U032229496U CN 03222949 U CN03222949 U CN 03222949U CN 2597996 Y CN2597996 Y CN 2597996Y
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- voltage
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- resistance
- alternating voltage
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Abstract
The utility model provides a sampling circuit that is applied in 220 V AC voltage. The utility model comprises a resistance, a voltage regulator diode, a photocoupler and a capacitor, all of which are connected sequentially. The resistance is connected with one input end of the photocoupler and the cathode of the voltage regulator diode whose anode is connected with the other input end of the photocoupler whose light sensitive dynatron collecting electrode output end is connected with the 5 V power supply voltage, the anode of the capacitor and the 5 V output end of the sampling voltage. The cathode of the capacitor is connected with the 0 V output end of the sampling voltage. The utility model has the advantages of simple structure, low cost, excellent economic benefit. The utility model can also reduce the failure rate of the circuit and improve the reliability and stability of the circuit.
Description
Technical field
The utility model relates to circuit, particularly a kind of sample circuit to the 220V alternating voltage.
Background technology
In computer control or testing circuit, need sometimes the 220V alternating voltage is sampled, to determine whether there is the 220V alternating voltage in the circuit.Because its operating voltage of integrated circuit that is adopted in computing machine or the testing circuit is generally dc low-voltage (5V), therefore, must design a kind of circuit reduces to the 220V alternating voltage about 5V, and it is become DC voltage, the ability that several kilovolts of spike undesired signals that seal in the 220V ac cable are isolated also will be arranged.At present, this class circuit is generally in the following ways: with resistance or capacitor or transformer the 220V alternating voltage is carried out step-down earlier, carry out rectification with diode then, carry out filtering with filtering circuit again, make the 220V alternating voltage become dc low-voltage, isolate by the light idol again, give computer control or testing circuit sampled signal; Employing is more with the needed element of 220V alternating voltage sample circuit of upper type, constitutes comparatively complexity, and manufacturing cost is higher.Thereby, design a kind of comparatively simple 220V alternating voltage sample circuit, will help reducing the production cost of computer control or testing circuit, owing to reduced the use element, also increased the reliability and the stability of circuit simultaneously.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming of prior art, designs a kind of 220V alternating voltage sample circuit simple in structure, to reduce production costs, improves the reliability of circuit.
The purpose of this utility model is achieved through the following technical solutions: this sample circuit to the 220V alternating voltage is connected in sequence by resistance, voltage stabilizing diode, light idol, capacitor.
The input end of described resistance and light idol and the negative pole of voltage stabilizing diode are connected; The positive pole of described voltage stabilizing diode is connected with another input end of light idol; The phototriode collector output of described light idol is connected with the 5V supply voltage; The phototriode emitter output terminal of described light idol is connected with sampled voltage 5V output terminal with electrolytic condenser is anodal; The negative pole of described electrolytic condenser is connected with sampled voltage 0V output terminal with direct current ground.
Described resistance specification is 0.25 watt 75000 ohm plain metal film resistance or a carbon resister.
Described capacitor specification is the electrolytic condenser of the withstand voltage 10V of 22 microfarads.
The miniwatt voltage stabilizing diode that described stabilivolt specification is 0.5 watt of 5V.
Described light idol model is PC817.
The utlity model has following advantage and effect: this 220V alternating voltage sample circuit is compared element with homogeneous circuit use amount has reduced over half, manufacturing cost reduces greatly, when needing a plurality of 220V alternating voltage sample circuit in the Circuits System, the effect of utilizing the utility model to reduce cost is tangible; Because the element that circuit adopts reduces the failure rate that will reduce circuit, improve the reliability and the stability of circuit simultaneously.
Description of drawings
Fig. 1 is that the utility model is used for the sample circuit schematic diagram of oil burning boiler controller to the 220V alternating voltage.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
Embodiment
Fig. 1 shows embodiment of the present utility model, as seen from Figure 1, this to 220V alternating voltage sample circuit by (75 kilo-ohms of resistance R, 0.25 watt), light idol G (model is PC817), a voltage stabilizing diode W (5V, 0.5 watt), (22 microfarads 10V) are formed for electrolytic condenser C.The input end of described resistance R and light idol G and the negative pole of voltage stabilizing diode W are connected; The positive pole of described voltage stabilizing diode W is connected with another input end of light idol G; The phototriode collector output of described light idol G is connected with the 5V supply voltage; The phototriode emitter output terminal of described light idol G is connected with sampled voltage 5V output terminal with electrolytic condenser C is anodal; The negative pole of described electrolytic condenser C is connected with sampled voltage 0V output terminal with direct current ground.
The action principle of this 220V alternating voltage sample circuit is: when the 220V of circuit ac voltage input has the 220V alternating voltage, positive half cycle at the 220V alternating voltage, after the step-down of 220V alternating voltage process resistance R, W is stabilized in 5V with AC-input voltage by voltage stabilizing diode, sampling input voltage as light idol G, the phototriode conducting of this time idol G, the voltage of the about 4.5V of emitter terminal output; Negative half period at the 220V alternating voltage; because this moment, voltage stabilizing diode W was in the forward conduction state; so through the reverse voltage that is added to light idol G input end after the resistance R step-down only is about 0.5V; protected the light idol G that can only accept low pressure input (zero to tens volts) not damaged by high pressure; because the input end of this time idol G has only the reverse voltage of 0.5V; therefore, the phototriode of light idol G ends, and the voltage of emitter terminal output is about zero volt.Become comparatively mild DC voltage after the filtering of dc pulse voltage through electrolytic condenser C of light idol G emitter terminal output and supply with computer control or the use of other testing circuits as the sampled signal of 220V alternating voltage.
Claims (5)
1, a kind of sample circuit to the 220V alternating voltage is characterized in that: be connected in sequence by resistance, voltage stabilizing diode, light idol, capacitor.
2, the sample circuit to the 220V alternating voltage according to claim 1 is characterized in that: the input end of described resistance and light idol and the negative pole of voltage stabilizing diode are connected; The positive pole of described voltage stabilizing diode is connected with another input end of light idol; The phototriode collector output of described light idol is connected with the 5V supply voltage; The phototriode emitter output terminal of described light idol is connected with sampled voltage 5V output terminal with capacitor anode; The negative pole of described capacitor is connected with sampled voltage 0V output terminal with direct current ground.
3, the sample circuit to the 220V alternating voltage according to claim 1 is characterized in that: described resistance is 0.25 watt 75000 ohm plain metal film resistance or carbon resister.
4, the sample circuit to the 220V alternating voltage according to claim 1 is characterized in that: described capacitor specification is the electrolytic condenser of the withstand voltage 10V of 22 microfarads.
5, the sample circuit to the 220V alternating voltage according to claim 1 is characterized in that: described stabilivolt is the miniwatt voltage stabilizing diode of 0.5 watt of 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032229496U CN2597996Y (en) | 2003-01-14 | 2003-01-14 | Sampling circuit for 220V ac voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032229496U CN2597996Y (en) | 2003-01-14 | 2003-01-14 | Sampling circuit for 220V ac voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2597996Y true CN2597996Y (en) | 2004-01-07 |
Family
ID=34162485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032229496U Expired - Fee Related CN2597996Y (en) | 2003-01-14 | 2003-01-14 | Sampling circuit for 220V ac voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2597996Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788895A (en) * | 2011-05-18 | 2012-11-21 | 富泰华工业（深圳）有限公司 | Alternating voltage detection circuit |
| CN112505395A (en) * | 2020-11-30 | 2021-03-16 | 贵州航天风华实业有限公司 | Alternating voltage and frequency detection system |
-
2003
- 2003-01-14 CN CNU032229496U patent/CN2597996Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788895A (en) * | 2011-05-18 | 2012-11-21 | 富泰华工业（深圳）有限公司 | Alternating voltage detection circuit |
| CN112505395A (en) * | 2020-11-30 | 2021-03-16 | 贵州航天风华实业有限公司 | Alternating voltage and frequency detection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |