CN201440149U - AC power supply state monitoring circuit and device - Google Patents
AC power supply state monitoring circuit and device Download PDFInfo
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- CN201440149U CN201440149U CN2009201340005U CN200920134000U CN201440149U CN 201440149 U CN201440149 U CN 201440149U CN 2009201340005 U CN2009201340005 U CN 2009201340005U CN 200920134000 U CN200920134000 U CN 200920134000U CN 201440149 U CN201440149 U CN 201440149U
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- 238000012544 monitoring process Methods 0.000 title abstract 8
- 238000001514 detection method Methods 0.000 claims description 28
- 239000003990 capacitor Substances 0.000 claims description 26
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
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Abstract
The utility model relates to an AC power supply state monitoring circuit, which comprises a rectification unit connected between an AC phase and a zero line, an infrared light emitting pipe, an infrared receiving pipe and a charge and discharge unit connected between the anode of the infrared receiving pipe and the ground in parallel. The infrared light emitting pipe is connected with the rectification unit in parallel. The infrared receiving pipe is electrically connected between a DC power supply end and a DC ground end and receives infrared signals sent by the infrared light emitting pipe. The monitoring signals of the monitoring circuit are output by the anode of the infrared receiving pipe. The utility model further discloses a device using the monitoring circuit. The utility model has the beneficial effects that because the charge and discharge unit is adopted, when the AC is on, the electrical level is pulled downed to the output monitoring signal electrical level while when the AC is power off, the monitoring signal output electrical level of the monitoring circuit is high. Therefore, the device simplifies the judgment of a CPU and reduces occupied system resources.
Description
Technical field
The utility model relates to the alternating current detection range, more particularly, relates to a kind of AC-powered status detection circuit and device.
Background technology
In many cases, people need know the state of current AC-powered, and wherein, a most basic state is whether current alternating current cuts off the power supply.This detection is necessary under many circumstances.For example, in the power supply switched system, just need when cutting off the power supply, alternating current switch to the standby power supply power supply as early as possible.Usually use light emitting diode and photoelectric receiving tube to detect alternating current, and the data transmission that records is judged to central processing unit.Wherein, central processing unit is detected to be high low pulse signal with the alternating current same frequency, as judge the alternating current incoming call with photoelectric receiving tube output low level (during the conducting of the positive half cycle photoelectric receiving tube of alternating current), judge the alternating current outage with photoelectric receiving tube output high level, will face a very big problem so: alternating current negative half period or outage the time all can cause photoelectric receiving tube to end and export high level, central processing unit can't be judged identification, current state be on earth alternating current the electricity went off, or alternating current is in negative half period.For addressing this problem, whether central processing unit need constantly go the height pulse signal frequency of detection computations photoelectric receiving tube output frequently same with alternating current, and the handling procedure of this method is comparatively loaded down with trivial details, occupying system resources is more.
The utility model content
The technical problems to be solved in the utility model is,, occupying system resources more defective comparatively loaded down with trivial details at the above-mentioned handling procedure of prior art provides a kind of simple, AC-powered status detection circuit and device that occupying system resources is few.
The technical scheme that its technical matters that solves the utility model adopts is: construct a kind of AC-powered status detection circuit, comprise the rectification unit that is connected between alternating current phase, the zero line, be attempted by the infraluminescence pipe on the described rectification unit and be connected electrically in dc power supply terminal and direct current ground end between, the infrared receiving tube that receives the infrared signal that described infraluminescence pipe sends, the detection signal of this testing circuit also comprises the charge/discharge unit that is connected in parallel between described infrared receiving tube positive pole and the ground by the positive pole output of described infrared receiving tube.
In testing circuit described in the utility model, described charge/discharge unit comprises electrochemical capacitor, and the positive pole of described electrochemical capacitor is connected with described infrared receiving diode is anodal, and its negative pole connects direct current ground.
In testing circuit described in the utility model, the positive pole of described infrared receiving tube is connected with described dc power supply terminal by first resistance.
In testing circuit described in the utility model, the appearance value of described electrochemical capacitor comprises 10 μ F-47 μ F; Described first resistance comprises 10K Ω-100K Ω.
In testing circuit described in the utility model, described rectification unit comprises the half-wave rectification unit.
In testing circuit described in the utility model, described infraluminescence pipe and infrared receiving tube comprise infraluminescence pipe and the infrared receiving tube that is encapsulated in the photoelectrical coupler in the same device.
In testing circuit described in the utility model, described half-wave rectification unit comprises resistance R 2, resistance R 3 and diode D1, described resistance R 2 one ends link to each other with the alternating current phase line, the other end is connected on the alternating current zero line by resistance R 3, the positive pole of described diode D1 is connected with described zero line, and its negative pole is connected on the tie point of described resistance R 2 and resistance R 3; The positive pole of described infraluminescence pipe is connected the negative pole of described diode D1, and its negative pole is connected with the positive pole of described diode D1.
The utility model has also disclosed a kind of device, comprise the central processing unit of accepting detection signal and judging the AC-powered state, it is characterized in that, also be included as described central processing unit described detection signal is provided, testing circuit, described testing circuit comprises and is connected the alternating current phase, rectification unit between the zero line, be attempted by the infraluminescence pipe on the described rectification unit and be connected electrically in dc power supply terminal and direct current ground end between, receive the infrared receiving tube of the infrared signal of described infraluminescence pipe transmission, the detection signal of this testing circuit also comprises the charge/discharge unit that is connected in parallel between described infrared receiving tube positive pole and the ground by the positive pole output of described infrared receiving tube.
Implement AC-powered status detection circuit of the present utility model and device, has following beneficial effect: owing to adopt charge/discharge unit to make the detection signal level of when alternating current is sent a telegram here, moving output to always, and the detection signal output level of testing circuit is high when alternating current cuts off the power supply, therefore, this device makes the judgement of central processing unit simple, occupying system resources is few.
Description of drawings
Fig. 1 is the structural representation of testing circuit among the utility model AC-powered status detection circuit and the device embodiment;
Fig. 2 is the circuit diagram of testing circuit among the described embodiment.
Embodiment
Below in conjunction with accompanying drawing the utility model embodiment is described further.
As shown in Figure 1, in the utility model AC-powered status detection circuit and device embodiment, this circuit comprises rectification unit 1, infraluminescence pipe 2, infrared receiving tube 3 and charge/discharge unit 4, wherein rectification unit 1 is connected on the phase line and zero line of alternating current, with output after alternating current step-down and the rectification as the luminous drive waveforms of driving infraluminescence pipe 2; Infrared receiving tube 3 is electrically connected on between its direct current power source supplying power end VCC and the direct current ground, also be connected with current-limiting resistance R1 between the positive pole of above-mentioned infrared receiving tube 3 and the dc power supply terminal VCC, the negative pole of infrared receiving tube 3 is connected with direct current ground, infraluminescence pipe 2 is luminous to be received by infrared receiving tube 3, infrared receiving tube 3 its electrorheological after receiving the infrared light that infraluminescence pipe 2 sends is big, the voltage drop step-down on it; Charge/discharge unit 4 is connected between the positive pole and direct current ground of above-mentioned infrared receiving tube 3.In the present embodiment, the output signal of foregoing circuit is drawn by the positive pole of above-mentioned infrared receiving tube 3.In the present embodiment, above-mentioned rectification unit 1 comprises the half-wave rectification unit; Charge/discharge unit 4 comprises electrochemical capacitor.
Fig. 2 is the electrical schematic diagram of present embodiment, and in Fig. 2, the half-wave rectification unit comprises resistance R 2, resistance R 3 and diode D1, and resistance R 2 one ends link to each other with the alternating current phase line, and the other end is connected on the alternating current zero line by resistance R 3; The positive pole of diode D1 is connected with described zero line, and its negative pole is connected on the tie point of resistance R 2 and resistance R 3; The positive pole of infraluminescence pipe is connected the negative pole of diode D1, and its negative pole is connected with the positive pole of diode D1.Dc power supply terminal VCC is connected to the positive pole of infrared receiving tube, the minus earth of infrared receiving tube by first resistance R 1; In addition, be connected the positive pole of above-mentioned infrared receiving tube as the positive pole of the electrochemical capacitor C1 of charge/discharge unit 4, electrochemical capacitor C1 goes up also and is connected to a ceramic disc capacitor, and this ceramic disc capacitor is used for filtering.In the present embodiment, the detection signal of alternating current outputs to processor by the positive pole of above-mentioned electrochemical capacitor, is used to differentiate the power supply state of alternating current.In the present embodiment, above-mentioned infraluminescence pipe and infrared receiving tube are encapsulated in together as a device, i.e. photoelectrical coupler, this set have further improved the reliability of signal transmission.In other embodiments, also can be independent infraluminescence pipe and infrared receiving tube.
As shown in Figure 2, in the present embodiment, the principle of work of this testing circuit is as follows: it keeps apart high pressure and low-voltage circuit by photoelectrical coupler, and changes the alternating current of positive and negative alternation into continual and steady direct current low level output.At the positive half cycle of alternating current, 3,4 output pin conductings of photoelectrical coupler, 3, the 4 pin discharge of electrochemical capacitor C1 by photoelectrical coupler, what resistance became during because of 3,4 output pin conductings of photoelectrical coupler is very little, electrochemical capacitor discharges rapidly by 3,4 output pins of photoelectrical coupler, and voltage is close to 0V; At the alternating current negative half period, 3,4 output pins of photoelectrical coupler end, power supply VCC by first resistance R 1 (in the present embodiment, its resistance is 20K Ω) charge to electrochemical capacitor, but because electrochemical capacitor C1 (in the present embodiment, its appearance value is 22 μ F) time constant is relatively large, its charging rate T (being charged to the time of 70%Vdd)=RC=20000 * 22 * 10
-6=0.44 second=440ms, this charging rate was far longer than the duration 10ms of alternating current negative half period, so 22UF electrochemical capacitor C1 charging voltage is lower than 1/8VCC, therefore can only be judged to low level.Come temporarily at the positive half cycle of next alternating current, 22UF electrochemical capacitor C1 is discharged again, and so under the situation that alternating current does not cut off the power supply, the voltage of electrochemical capacitor C1 anode is always less than 1/8VCC, so the detection signal of its output low level always.
When alternating current cut off the power supply, 3,4 pin of photoelectrical coupler ended, and electrochemical capacitor C1 can only can't discharge by 3,4 pin of photoelectrical coupler through 1 charging of first resistance R, so electrochemical capacitor C1 is transformed into lasting high level.Like this, central processing unit just can just can judge that alternating current is that (that is: be low level as detecting photoelectrical coupler the 4th pin, then declaring alternating current has incoming call for incoming call or outage by the detected high and low level of I/O mouth of simple detection; As to detect photoelectrical coupler the 4th pin be high level, then declares the alternating current outage), and need not by detection computations ac frequency repeatedly confirm the end be alternating current the electricity went off, or alternating current is in negative half period.
In the present embodiment, the appearance value of above-mentioned electrochemical capacitor C1 is 22 μ F, and the resistance of first resistance R 1 is 20K Ω, in other embodiments, it also can not above-mentioned value, the value of its electrochemical capacitor C1 can be in 10 μ F-47 μ F value, and the value of first resistance R 1 can obtain in 10K Ω-100K Ω.Mainly decide according to the concrete condition of circuit.
Present embodiment has also disclosed a kind of equipment that uses above-mentioned testing circuit, comprise the central processing unit of accepting detection signal and judging the AC-powered state, also being included as described central processing unit provides the testing circuit of described detection signal, described testing circuit comprises and is connected the alternating current phase, rectification unit between the zero line, be attempted by the infraluminescence pipe on the described rectification unit and be connected electrically in dc power supply terminal and direct current ground end between, receive the infrared receiving tube of the infrared signal of described infraluminescence pipe transmission, the detection signal of this testing circuit also comprises the charge/discharge unit that is connected in parallel between described infrared receiving tube positive pole and the ground by the positive pole output of described infrared receiving tube; Described charge/discharge unit comprises electrochemical capacitor, and the positive pole of described electrochemical capacitor is connected with described infrared receiving diode is anodal, and its negative pole connects direct current ground; The positive pole of described infrared receiving tube is connected with described dc power supply terminal by first resistance; The appearance value of described electrochemical capacitor comprises 10 μ F-47 μ F; Described first resistance comprises 10K Ω-100K Ω; Described rectification unit comprises the half-wave rectification unit; Described infraluminescence pipe and infrared receiving tube comprise infraluminescence pipe and the infrared receiving tube that is encapsulated in the photoelectrical coupler in the same device.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (8)
1. AC-powered status detection circuit, comprise the rectification unit that is connected between alternating current phase, the zero line, be attempted by the infraluminescence pipe on the described rectification unit and be connected electrically in dc power supply terminal and direct current ground end between, the infrared receiving tube that receives the infrared signal that described infraluminescence pipe sends, the detection signal of this testing circuit is by the positive pole output of described infrared receiving tube, it is characterized in that, also comprise the charge/discharge unit that is connected in parallel between described infrared receiving tube positive pole and the ground.
2. testing circuit according to claim 1 is characterized in that described charge/discharge unit comprises electrochemical capacitor, and the positive pole of described electrochemical capacitor is connected with described infrared receiving diode is anodal, and its negative pole connects direct current ground.
3. testing circuit according to claim 2 is characterized in that, the positive pole of described infrared receiving tube is connected with described dc power supply terminal by first resistance.
4. testing circuit according to claim 3 is characterized in that, the appearance value of described electrochemical capacitor comprises 10 μ F-47 μ F; Described first resistance comprises 10K Ω-100K Ω.
5. testing circuit according to claim 4 is characterized in that described rectification unit comprises the half-wave rectification unit.
6. according to any described testing circuit of claim 1-5, it is characterized in that described infraluminescence pipe and infrared receiving tube comprise infraluminescence pipe and the infrared receiving tube that is encapsulated in the photoelectrical coupler in the same device.
7. testing circuit according to claim 6, it is characterized in that, described half-wave rectification unit comprises resistance R 2, resistance R 3 and diode D1, described resistance R 2 one ends link to each other with the alternating current phase line, the other end is connected on the alternating current zero line by resistance R 3, the positive pole of described diode D1 is connected with described zero line, and its negative pole is connected on the tie point of described resistance R 2 and resistance R 3; The positive pole of described infraluminescence pipe is connected the negative pole of described diode D1, and its negative pole is connected with the positive pole of described diode D1.
8. AC-powered status detection device, comprise the central processing unit of accepting detection signal and judging the AC-powered state, it is characterized in that, also be included as described central processing unit testing circuit described detection signal, as claimed in claim 6 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201340005U CN201440149U (en) | 2009-08-04 | 2009-08-04 | AC power supply state monitoring circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201340005U CN201440149U (en) | 2009-08-04 | 2009-08-04 | AC power supply state monitoring circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN201440149U true CN201440149U (en) | 2010-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201340005U Expired - Fee Related CN201440149U (en) | 2009-08-04 | 2009-08-04 | AC power supply state monitoring circuit and device |
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| CN (1) | CN201440149U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104111397A (en) * | 2013-04-18 | 2014-10-22 | 深圳市海洋王照明工程有限公司 | Power interruption detection circuit and lamp |
| CN106226641A (en) * | 2016-08-30 | 2016-12-14 | 温岭甬岭水表有限公司 | Device for rapidly detecting open circuit of infrared receiving tube |
-
2009
- 2009-08-04 CN CN2009201340005U patent/CN201440149U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104111397A (en) * | 2013-04-18 | 2014-10-22 | 深圳市海洋王照明工程有限公司 | Power interruption detection circuit and lamp |
| CN104111397B (en) * | 2013-04-18 | 2017-02-08 | 深圳市海洋王照明工程有限公司 | Power interruption detection circuit and lamp |
| CN106226641A (en) * | 2016-08-30 | 2016-12-14 | 温岭甬岭水表有限公司 | Device for rapidly detecting open circuit of infrared receiving tube |
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| 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: 20100421 Termination date: 20170804 |
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| CF01 | Termination of patent right due to non-payment of annual fee |