CN203850814U - Load protection circuit of air purifier - Google Patents
Load protection circuit of air purifier Download PDFInfo
- Publication number
- CN203850814U CN203850814U CN201420287716.XU CN201420287716U CN203850814U CN 203850814 U CN203850814 U CN 203850814U CN 201420287716 U CN201420287716 U CN 201420287716U CN 203850814 U CN203850814 U CN 203850814U
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- resistance
- comparator
- load
- protection circuit
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Abstract
The utility model discloses the load protection circuit of an air purifier, which comprises an operational amplifier (1), a comparator (2), a triode (3), a first resistor (4), a second resistor (5), a third resistor (6), a fourth resistor (7), a fifth resistor (8), a sixth resistor (9), a seventh resistor (10), an eighth resistor (11), a ninth resistor (12) and a tenth resistor (13). The operational amplifier (1) is used for amplifying a load current signal. The amplified signal is then compared with a reference level, and then the on/off state of a load circuit is controlled based on the comparison result. According to the technical scheme of the utility model, by means of the load protection circuit of the air purifier, the current of a load is sampled, and then the power supply to the load can be timely cut off during the overload or short-circuit phenomenon. Therefore, all functional load modules of the air purifier can be protected from being damaged.
Description
Technical field
The utility model relates to a kind of load protection circuit, particularly protective circuit during the excessive or short circuit of load current in air cleaning machine equipment.
Background technology
Air cleaner can adsorb, decomposes or transform various airborne pollutants, effectively improves the product of indoor air clean degree, at home, medical treatment, industrial circle all have application.Topmost function is to remove airborne particle, comprises anaphylactogen, indoor PM2.5 etc., can also solve due to volatile organic matter air pollution problems inherent in indoor, the underground space that finishing or other reasons cause, car simultaneously.
Air cleaner comprises anion generator and high-tension circuit mostly, once load circuit occurs the useful life of transshipping or short circuit meeting reduces air cleaner greatly, even can cause fire.
Therefore, need to design a kind of air cleaner load protection circuit, it is not damaged with protection equipment and device that this circuit can be made rapidly action when abnormal conditions appear in air cleaner load.
Utility model content
In view of this, the utility model provides a kind of air cleaner load protection circuit, adopts operational amplifier to carry out amplification detection signal, and is compared and determined whether cutting off load supplying by comparator and reference current.
Air cleaner load protection circuit of the present utility model, comprises operational amplifier, comparator, triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance; The input in the same way of described the first operational amplifier is connected with load current signal by the first resistance, the second resistance, reverse input end is connected and is connected with output by the 4th resistance with ground by the 3rd resistance, and output is connected with comparator positive input by the 5th resistance; Described comparator positive input negative input end is connected with ground by the 8th resistance, and reverse input end is connected and is connected with the positive 12V of power supply by the 6th resistance with ground by the 7th resistance, and output is connected with transistor base by the 9th resistance; Described transistor collector is connected with load switch pipe and is connected with the positive 12V of power supply by the tenth resistance, and emitter is connected with ground; When being less than comparator negative input setting reference voltage by comparator positive input signal voltage, comparator output low level, triode cut-off, this circuit is exported high level to load switch pipe, load normal power supply; When being greater than by comparator positive input signal voltage when comparator negative input is set reference voltage, comparator output high level, triode conducting, this circuit output low level, to load switch pipe, is cut off load supplying.
Further, described air cleaner load protection circuit, also comprises diode, and described diode cathode is connected with comparator output terminal, and negative pole is connected with transistor base, prevents that electric current from oppositely pouring into air cleaner load protection circuit.
Further, described air cleaner load protection circuit, also comprises the first electric capacity, and described the first capacitance cathode is connected negative pole and is connected with ground with the first resistance, and filtering is input to described the first operational amplifier noise signal.
Further, described air cleaner load protection circuit, also comprises the second electric capacity, and described the second capacitance cathode is connected negative pole and is connected with ground with the 6th resistance, and filtering is input to described comparator reverse input end noise signal.
Further, described air cleaner load protection circuit, also comprises the 3rd electric capacity, and described the 3rd capacitance cathode is connected negative pole and is connected with ground with the 5th resistance, and filtering is input to described comparator positive input noise signal.
The beneficial effects of the utility model: air cleaner load protection circuit of the present utility model, load current is sampled, during to appearance overload or short circuit phenomenon, can cut off in time load, guarantee that each function load blocks of air cleaner is not damaged.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further described.
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Fig. 1 is circuit diagram of the present utility model, as shown in the figure: air cleaner load protection circuit of the present utility model, comprises operational amplifier 1, comparator 2, triode 3, the first resistance 4, the second resistance 5, the 3rd resistance 6, the 4th resistance 7, the 5th resistance 8, the 6th resistance 9, the 7th resistance 10, the 8th resistance 11, the 9th resistance 12 and the tenth resistance 13; The input in the same way of described the first operational amplifier 1 is connected with load current signal by the first resistance 4, the second resistance 5, reverse input end is connected and is connected with output by the 4th resistance 7 with ground by the 3rd resistance 6, and output is connected with comparator 2 positive inputs by the 5th resistance 8; Described comparator 2 positive input negative input ends are connected with ground by the 8th resistance 11, and reverse input end is connected and is connected with the positive 12V of power supply by the 6th resistance 9 with ground by the 7th resistance 10, and output is connected with transistor base by the 9th resistance 12; Described triode 3 collector electrodes are connected with load switch pipe and are connected with the positive 12V of power supply by the tenth resistance 13, and emitter is connected with ground; When being less than comparator 2 negative inputs setting reference voltage by comparator 2 positive input signal voltages, comparator 2 output low levels, triode 3 cut-offs, this circuit is exported high level to load switch pipe, load normal power supply; When being greater than by comparator 2 positive input signal voltages when comparator 2 negative inputs are set reference voltage, comparator 2 output high level, triode 3 conductings, this circuit output low level, to load switch pipe, is cut off load supplying.
In the present embodiment, described air cleaner load protection circuit also comprises diode 14, and described diode 14 is anodal to be connected with comparator 2 outputs, and negative pole is connected with triode 3 base stages, prevents that electric current from oppositely pouring into air cleaner load protection circuit.
In the present embodiment, described air cleaner load protection circuit, also comprises the first electric capacity 15, and the anodal negative pole that is connected with the first resistance 4 of described the first electric capacity 15 is connected with ground, and filtering is input to described the first operational amplifier 1 noise signal.
In the present embodiment, described air cleaner load protection circuit, also comprises the second electric capacity 16, and the anodal negative pole that is connected with the 6th resistance 9 of described the second electric capacity 16 is connected with ground, and filtering is input to described comparator 2 reverse input end noise signals.
In the present embodiment, described air cleaner load protection circuit, also comprises the 3rd electric capacity 17, and the anodal negative pole that is connected with the 5th resistance 8 of described the 3rd electric capacity 17 is connected with ground, and filtering is input to described comparator 2 positive input noise signals.
Finally explanation is, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (5)
1. an air cleaner load protection circuit, it is characterized in that, comprise operational amplifier (1), comparator (2), triode (3), the first resistance (4), the second resistance (5), the 3rd resistance (6), the 4th resistance (7), the 5th resistance (8), the 6th resistance (9), the 7th resistance (10), the 8th resistance (11), the 9th resistance (12) and the tenth resistance (13); The input in the same way of described the first operational amplifier (1) is connected with load current signal by the first resistance (4), the second resistance (5), reverse input end is connected and passes through the 4th resistance (7) with ground by the 3rd resistance (6) and is connected with output, and output is connected with comparator (2) positive input by the 5th resistance (8); Described comparator (2) positive input negative input end is connected with ground by the 8th resistance (11), reverse input end is connected and passes through the 6th resistance (9) with ground by the 7th resistance (10) and is connected with the positive 12V of power supply, and output is connected with transistor base by the 9th resistance (12); Described triode (3) collector electrode is connected with load switch pipe and passes through the tenth resistance (13) and is connected with the positive 12V of power supply, and emitter is connected with ground; When being less than comparator (2) negative input setting reference voltage by comparator (2) positive input signal voltage, comparator (2) output low level, triode (3) cut-off, this circuit is exported high level to load switch pipe, load normal power supply; When being greater than by comparator (2) positive input signal voltage when comparator (2) negative input is set reference voltage, comparator (2) output high level, triode (3) conducting, this circuit output low level, to load switch pipe, is cut off load supplying.
2. air cleaner load protection circuit according to claim 1; it is characterized in that: also comprise diode (14); described diode (14) is anodal to be connected with comparator (2) output; negative pole is connected with triode (3) base stage, prevents that electric current from oppositely pouring into air cleaner load protection circuit.
3. air cleaner load protection circuit according to claim 1; it is characterized in that: also comprise the first electric capacity (15); the anodal negative pole that is connected with the first resistance (4) of described the first electric capacity (15) is connected with ground, and filtering is input to described the first operational amplifier (1) noise signal.
4. air cleaner load protection circuit according to claim 1; it is characterized in that: also comprise the second electric capacity (16); the anodal negative pole that is connected with the 6th resistance (9) of described the second electric capacity (16) is connected with ground, and filtering is input to described comparator (2) reverse input end noise signal.
5. air cleaner load protection circuit according to claim 1; it is characterized in that: also comprise the 3rd electric capacity (17); the anodal negative pole that is connected with the 5th resistance (8) of described the 3rd electric capacity (17) is connected with ground, and filtering is input to described comparator (2) positive input noise signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420287716.XU CN203850814U (en) | 2014-06-03 | 2014-06-03 | Load protection circuit of air purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420287716.XU CN203850814U (en) | 2014-06-03 | 2014-06-03 | Load protection circuit of air purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203850814U true CN203850814U (en) | 2014-09-24 |
Family
ID=51563786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420287716.XU Expired - Fee Related CN203850814U (en) | 2014-06-03 | 2014-06-03 | Load protection circuit of air purifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203850814U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108205100A (en) * | 2016-12-16 | 2018-06-26 | 深圳市三诺数字科技有限公司 | A kind of circuit checker |
| CN113092836A (en) * | 2021-04-14 | 2021-07-09 | 山东英信计算机技术有限公司 | Circuit and method for realizing reliable protection of load circuit |
-
2014
- 2014-06-03 CN CN201420287716.XU patent/CN203850814U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108205100A (en) * | 2016-12-16 | 2018-06-26 | 深圳市三诺数字科技有限公司 | A kind of circuit checker |
| CN113092836A (en) * | 2021-04-14 | 2021-07-09 | 山东英信计算机技术有限公司 | Circuit and method for realizing reliable protection of load circuit |
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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: 20140924 Termination date: 20150603 |
|
| EXPY | Termination of patent right or utility model |