CN203057005U - Switching power supply device of air purifier - Google Patents
Switching power supply device of air purifier Download PDFInfo
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- CN203057005U CN203057005U CN 201220596811 CN201220596811U CN203057005U CN 203057005 U CN203057005 U CN 203057005U CN 201220596811 CN201220596811 CN 201220596811 CN 201220596811 U CN201220596811 U CN 201220596811U CN 203057005 U CN203057005 U CN 203057005U
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- power supply
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- source chip
- voltage
- optocoupler
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Abstract
The utility model discloses a switching power supply device of an air purifier. The switching power supply device comprises a PWM module as well as a rectifying and voltage-stabilizing module, a transformer and a switching tube which are connected with each other successively; an optocoupler feedback loop is connected between an a power supply output end and the PWM module; a failure protection circuit mainly composed of a reference source chip is connected between a collector and an emitter of an optocoupler secondary edge; the transformer comprises an auxiliary coil used for supplying power for the optocoupler feedback loop; a resistor R1 and a resistor R2 are connected in series between a positive pole and a negative pole of the reference source chip; a control pole of the reference source chip is connected with a series-connection point of the resistor R1 and the resistor R2; and the a positive pole and the negative pole of the reference source chip are respectively connected with the collector and the emitter of the optocoupler secondary edge. According to the switching power supply device of the utility model, the reference source chip is adopted to form a reference voltage-stabilizing circuit which can greatly clamp voltage at two ends of the optocoupler secondary edge in the optocoupler feedback loop and can prevent continuous rise of output voltage, and therefore, the security of the power supply device of the air purifier can be ensured.
Description
Technical field
The utility model relates to the air purifier technical field, is specifically related to a kind of switching power unit of air purifier.
Background technology
Along with the raising of people's living standard and the renewal of health idea, recognize that more and more air quality is to the importance of health.
The normal feedback control loop that has optic coupling element that adopts of employed switching power unit is connected between power output end and the PWM module in the existing air purifier, because optic coupling element adopts the mode of optical coupling to carry out the signal transmission, can under the state that circuit is isolated, realize voltage transmission control, therefore the interference for the PWM module can significantly reduce in transmission course, favored by those skilled in the art, but the problem that adopts optic coupling element also can run into is: in case optic coupling element lost efficacy, then the feedback control loop of power supply can lose efficacy, cause power supply to lose automatic control ability (being open loop), cause the signal of output can not feed back to input, therefore output current can continue to rise, and accelerated the temperature rise of power supply itself, cause power supply itself and load to damage, and then cause the device damage even cause burning.
The utility model content
The utility model provides a kind of switching power unit of air purifier, can address the above problem.
The utility model provides a kind of switching power unit of air purifier; comprise PWM module and the rectifying and voltage-stabilizing module that connects successively; transformer; switching tube; the output of rectifying and voltage-stabilizing module is the PWM module for power supply; the conducting of PWM module controls switching tube with end; also be connected with the optocoupler feedback control loop that comprises optocoupler U3 between power output end and the PWM module; be connected the fail-safe circuit that is mainly constituted by a reference source chip U1 between the collector electrode of optical coupling secondary edges and the emitter; wherein; transformer comprises that also one is used to the ancillary coil T1 of optocoupler feedback control loop power supply; the resistance R 1 and the resistance R 2 that are connected series connection between the negative electrode of a reference source chip U1 and the anode; the control utmost point of a reference source chip U1 is connected in the series connection point of resistance R 1 and resistance R 2, and the negative electrode of a reference source chip U1 and anode are connected collector electrode and the emitter of optical coupling secondary edges respectively.
Preferably, described a reference source chip U1 is the LM236 chip.
Technique scheme as can be seen; because adopting a reference source chip to constitute reference voltage-stabilizing circuit, the utility model embodiment can carry out clamper to the voltage at optical coupling secondary edges two ends; when raising, the voltage of optical coupling secondary edges in time guard signal is sent to the PWM module; can allow the PWM module quit work; and then turn-off whole Switching Power Supply, the air purifier of safer protection.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of switching power unit among the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making all other embodiment that obtain under the creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment:
The utility model embodiment provides a kind of switching power unit of air purifier; as shown in Figure 1; comprise PWM module and the rectifying and voltage-stabilizing module that connects successively; transformer; switching tube; the output of rectifying and voltage-stabilizing module is the PWM module for power supply; the conducting of PWM module controls switching tube with end; also be connected with the optocoupler feedback control loop that comprises optocoupler U3 between power output end and the PWM module; be connected the fail-safe circuit that is mainly constituted by a reference source chip U1 between the collector electrode of optical coupling secondary edges and the emitter; wherein; transformer comprises that also one is used to the ancillary coil T1 of optocoupler feedback control loop power supply; the resistance R 1 and the resistance R 2 that are connected series connection between the negative electrode of a reference source chip U1 and the anode; the control utmost point of a reference source chip U1 is connected in the series connection point of resistance R 1 and resistance R 2, and the negative electrode of a reference source chip U1 and anode are connected collector electrode and the emitter of optical coupling secondary edges respectively.
The U1 of a reference source chip described in the utility model embodiment is the LM236 chip.
Be understandable that because the optocoupler feedback control loop by ancillary coil T1 power supply, therefore, does not need external power supply, simplified power supply architecture, and reduced energy loss.
The Switching Power Supply of air purifier has the input of interchange among the utility model embodiment; trouble free service for the Switching Power Supply that guarantees air purifier; can increase overvoltage protector or fuse at ac input end; can in time disconnect input when too high or electric current is big when input voltage, the protection power supply.Obtain direct voltage after the alternating current process rectifying and voltage-stabilizing module; be understandable that; the rectifying and voltage-stabilizing module has multiple implementation; adopt rectifier bridge to connect the combination of filter capacitor among the utility model embodiment; circuit structure simply is easy to realize; can increase voltage-stabiliser tube behind filter capacitor further stablizes voltage; guarantee the steady output of direct voltage; the direct voltage of rectifying and voltage-stabilizing module output; wherein one road direct voltage is the PWM module for power supply; another road direct voltage transfers to the primary coil of transformer; in the PWM module, has control chip; this control chip can adopt UC3842 chip or SG3525 chip, and concrete pwm chip should not constitute the restriction to the utility model protection range.Transformer among the utility model embodiment has primary coil and secondary coil, but also has ancillary coil T1, and be the power supply of optocoupler feedback control loop by ancillary coil T1, the primary coil of transformer connects switching tube, switching tube is by R13 ground connection, switching tube can adopt the CMOS pipe to have switching frequency and response speed preferably, the grid of PWM module connection CMOS pipe is controlled the conducting of CMOS pipe and is ended, thereby the primary coil at transformer produces the oscillating voltage with certain pulsewidth, realize the voltage coupled transfer of the former secondary of transformer, for the Switching Power Supply that guarantees air purifier has more stable output voltage, therefore between the output of the Switching Power Supply of air purifier and PWM module, be connected with feedback loop, feedback loop among the utility model embodiment is the optocoupler feedback control loop, can be in real time the voltage of output be fed back to the PWM module by the optocoupler feedback control loop, and then the pulsewidth width of the oscillating voltage of PWM module by control transformer primary coil place is to output (J1, the J2 terminal) voltage is made conciliation, realizes closed-loop control.
In the voltage feedback procedure of optocoupler feedback control loop, the anode of the luminous tube of optocoupler U3 is connected to the output terminal J1 of the Switching Power Supply of air purifier, therefore the output end voltage of the Switching Power Supply of air purifier can be controlled the conducting state of optocoupler U3 by R10, and then the voltage on the control divider resistance R12, thereby the voltage condition of the Switching Power Supply output of air purifier is fed back to the PWM module, and in the course of work of the Switching Power Supply of air purifier, the situation that optocoupler U3 lost efficacy may take place, cause the optocoupler feedback control loop to disconnect, control voltage control variable to the output of the Switching Power Supply of air purifier is controlled for open loop, cause the output current of output of the Switching Power Supply of air purifier continue to raise and can not get control, therefore in the utility model embodiment, be connected the fail-safe circuit that is mainly constituted by a reference source chip U1 between the collector electrode of optocoupler U3 secondary and the emitter, the resistance R 1 and the resistance R 2 that are connected series connection between the negative electrode of a reference source chip U1 and the anode, the control utmost point of a reference source chip U1 is connected in the series connection point of resistance R 1 and resistance R 2, and the negative electrode of a reference source chip U1 and anode are connected collector electrode and the emitter of optical coupling secondary edges respectively; In case optocoupler U3 lost efficacy, the two ends that constitute reference voltage-stabilizing circuit by a reference source chip U1 can form stable benchmark voltage so, namely form stable voltage at the collector electrode of optocoupler U3 and the two ends of emitter, guarantee that the magnitude of voltage on the divider resistance is certain, thereby the Switching Power Supply that makes the PWM module can control air purifier has certain voltage to be exported, and avoids being in open loop control and continuing rising of output voltage.
Adopt a reference source chip to constitute reference voltage-stabilizing circuit among the utility model embodiment and can be good at clamping down on the voltage at optical coupling secondary edges two ends in the optocoupler feedback control loop, therefore, can prevent that output end voltage from continuing to rise, guarantee the safety of the Switching Power Supply of air purifier.
More than the switching power unit of a kind of air purifier that the utility model embodiment is provided be described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present utility model; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (2)
1. the switching power unit of an air purifier; it is characterized in that: comprise PWM module and the rectifying and voltage-stabilizing module that connects successively; transformer; switching tube; the output of rectifying and voltage-stabilizing module is the PWM module for power supply; the conducting of PWM module controls switching tube with end; also be connected with the optocoupler feedback control loop that comprises optocoupler U3 between power output end and the PWM module; be connected the fail-safe circuit that is mainly constituted by a reference source chip U1 between the collector electrode of optical coupling secondary edges and the emitter; wherein; transformer comprises that also one is used to the ancillary coil T1 of optocoupler feedback control loop power supply; the resistance R 1 and the resistance R 2 that are connected series connection between the negative electrode of a reference source chip U1 and the anode; the control utmost point of a reference source chip U1 is connected in the series connection point of resistance R 1 and resistance R 2, and the negative electrode of a reference source chip U1 and anode are connected collector electrode and the emitter of optical coupling secondary edges respectively.
2. the switching power unit of a kind of air purifier as claimed in claim 1, it is characterized in that: described a reference source chip U1 is the LM236 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220596811 CN203057005U (en) | 2012-11-13 | 2012-11-13 | Switching power supply device of air purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220596811 CN203057005U (en) | 2012-11-13 | 2012-11-13 | Switching power supply device of air purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057005U true CN203057005U (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220596811 Expired - Fee Related CN203057005U (en) | 2012-11-13 | 2012-11-13 | Switching power supply device of air purifier |
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| Country | Link |
|---|---|
| CN (1) | CN203057005U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253546A (en) * | 2014-09-23 | 2014-12-31 | 惠州市可立克科技有限公司 | Switching power supply circuit |
| CN106549581A (en) * | 2015-09-18 | 2017-03-29 | 立锜科技股份有限公司 | The control circuit of flyback power supply transducer |
| WO2017147790A1 (en) * | 2016-03-01 | 2017-09-08 | Astec International Limited | Switch mode power supplies including primary side clamping circuits controlled based on secondary side signals |
-
2012
- 2012-11-13 CN CN 201220596811 patent/CN203057005U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253546A (en) * | 2014-09-23 | 2014-12-31 | 惠州市可立克科技有限公司 | Switching power supply circuit |
| CN106549581A (en) * | 2015-09-18 | 2017-03-29 | 立锜科技股份有限公司 | The control circuit of flyback power supply transducer |
| CN106549581B (en) * | 2015-09-18 | 2019-03-12 | 立锜科技股份有限公司 | The control circuit of flyback power supply converter |
| WO2017147790A1 (en) * | 2016-03-01 | 2017-09-08 | Astec International Limited | Switch mode power supplies including primary side clamping circuits controlled based on secondary side signals |
| US9991799B2 (en) | 2016-03-01 | 2018-06-05 | Astec International Limited | Switch mode power supplies including primary side clamping circuits controlled based on secondary side signals |
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| 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: 20130710 Termination date: 20151113 |
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| EXPY | Termination of patent right or utility model |