CN2660754Y - Mains protective circuit of household electrical appliances - Google Patents
Mains protective circuit of household electrical appliances Download PDFInfo
- Publication number
- CN2660754Y CN2660754Y CN 200320121011 CN200320121011U CN2660754Y CN 2660754 Y CN2660754 Y CN 2660754Y CN 200320121011 CN200320121011 CN 200320121011 CN 200320121011 U CN200320121011 U CN 200320121011U CN 2660754 Y CN2660754 Y CN 2660754Y
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- main switch
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Abstract
The utility model discloses a protective circuit for switch power supply and is particularly applicable for the switch power supply of household appliances. The utility model is added a detection circuit for short circuit through the output terminal of a main switch power supply circuit to monitor power supply output in real time, achieving that the switch power supply can be closed in time and power supply state can be locked through protection triggering of locked circuit when short circuit occurs due to load, thereby avoiding security incidents, such as high temperature caused by power supply load. The circuit does not need specific components or even software design, with simple structure, security and reliability, and low cost.
Description
Technical field
The utility model relates to a kind of protective circuit of switch power source, specifically a kind of protective circuit that is applied in the Switching Power Supply in the household appliances.
Background technology
In household electrical appliance, power circuit is a wherein very important part.At present, the power of household electrical appliance is increasing, and is also more and more higher to the requirement of power safety performance, if the output of power supply is not detected control, in case load is short-circuited, will cause power supply to transship, and causes the generation of security incidents such as high temperature.
Summary of the invention
The utility model is in order to overcome the deficiencies in the prior art; a kind of power protecting circuit is provided; this circuit adopts particular design at Switching Power Supply; each road output in Switching Power Supply adds testing circuit; powered-down is also locked rapidly when load is short-circuited, and prevents that the power supply overload from causing the generation of accident.
In order to solve the problems of the technologies described above, the utility model is achieved by the following technical programs:
A kind of household electrical appliance protective circuit of switch power source, comprise the main switch power circuit, the output of described main switch power circuit includes positive voltage output end and negative voltage output, the output of described main switch power circuit links to each other with a short-circuit detecting circuit, the output of described short-circuit detecting circuit is connected with a protection and triggers lock-in circuit, realizes the locking to the main switch power circuit state; Input at the main switch power circuit has additional a final controlling element and a standby power, and control end one end of described final controlling element connects the output of standby power, and the other end triggers lock-in circuit by one drive circuit and described protection and links to each other.
Described short-circuit detecting circuit includes two diodes, two divider resistances and two triodes at least; Wherein, the negative pole of a diode links to each other with the positive voltage output end of main switch power circuit, and the negative pole of another diode links to each other with the collector electrode of a triode, and its base stage links to each other with the negative voltage output of main switch power circuit by divider resistance; The positive pole of two diodes all links to each other with the base stage of another triode by resistance, and the emitter of this triode links to each other with the output of standby power, and collector electrode passes through grounding through resistance.
Described protection triggers lock-in circuit and consists predominantly of a controllable silicon, and its positive pole links to each other with the output of standby power, and negative pole links to each other with described drive circuit, and its control end links to each other with the collector electrode of second triode in the short-circuit detecting circuit by resistance; In addition, described silicon controlled negative pole links to each other with the main switch power circuit by an optocoupler.
Described drive circuit consists predominantly of two triodes, and wherein, the base stage of first triode links to each other with the silicon controlled negative pole, and collector electrode links to each other with the base stage of second triode and the output of standby power respectively.
Described final controlling element has adopted a relay, and its armature contact is serially connected in the input of main switch power circuit, and control end is serially connected between the collector electrode of second triode in the output of described standby power and the drive circuit.
Compared with prior art; the beneficial effects of the utility model are: by setting up short-circuit detecting circuit at the output of main switch power supply; output is monitored to power supply in real time; realized when load is short-circuited; timely off switch power supply and trigger lock-in circuit by protection power supply status is locked is avoided because power supply transships the generation of the security incidents such as high temperature that cause.This circuit does not need special components and parts, does not more need software design, and is simple in structure, safe and reliable, with low cost.
Description of drawings
Fig. 1 is the theory diagram of the utility model protective circuit of switch power source;
Fig. 2 is the physical circuit figure of the utility model protective circuit of switch power source.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Among Fig. 1, set up short-circuit detecting circuit, realized real-time detection power supply output at the output of main switch power circuit; Its output triggers lock-in circuit with a protection and links to each other, and this protection triggering lock-in circuit can be realized the locking to the main switch power circuit state; Input at the main switch power circuit has additional a final controlling element and a standby power, and control end one end of described final controlling element connects the output of standby power, and the other end triggers lock-in circuit by a drive circuit and protection and links to each other.When short-circuit detecting circuit detects load short circuits, can drive the final controlling element action by drive circuit, make the main switch power cut-off, avoid the generation of accident.The physical circuit of realizing its protective effect is referring to shown in Figure 2.
Among Fig. 2, short-circuit detecting circuit mainly is made up of diode VD1～VDn, divider resistance R7, R8, triode V1, V2 and resistance R 4, R5, R6.The positive voltage output end of main switch power circuit directly links to each other with the negative pole of diode, and the negative voltage output then need pass through divider resistance, triode links to each other with the negative pole of diode, and existing is that example is illustrated with positive voltage output end 1 and negative voltage output 1.The positive voltage output end 1 of main switch power circuit links to each other with the negative pole of diode VD1, and negative voltage output 1 links to each other with the base stage of triode V2 by divider resistance R7, and its collector electrode links to each other with the negative pole of diode VD4.The positive pole of described diode VD1 and VD4 all links to each other by the base stage of resistance R 6 with triode V1, and its emitter links to each other with the output of standby power, and collector electrode is by resistance R 4 ground connection.
In protection triggering lock-in circuit, consist predominantly of a controllable silicon SCR1; its control end links to each other with the collector electrode of triode V1 by resistance R 3; the anodal output that connects standby power, negative pole one tunnel connects drive circuit, and the resistance R 1 of leading up to links to each other with the main switch power circuit with optocoupler N2.
Include two triode V3, V4 in drive circuit, the base stage of triode V3 links to each other with the negative pole of controllable silicon SCR 1 by resistance R 9, and its collector electrode links to each other with the base stage of triode V4, and the collector electrode by triode V4 links to each other with the control end of final controlling element.Final controlling element has adopted a relay J 1 in the utility model, and its armature contact is serially connected in certain circuitry phase of line voltage, and control end is serially connected between the output and drive circuit of standby power.Described standby power converts electrical network 220V alternating current to+and the 5V direct current provides direct current supply for protective circuit.
The course of work of whole protecting circuit is as follows: when positive voltage output end 1 load that connects of main switch power circuit is short-circuited; output voltage is approximately 0V, at this moment, and diode VD1 conducting; and then making triode V1 be in conducting state, control controllable silicon SCR 1 conducting is also kept.The conducting of controllable silicon SCR 1 makes standby power output+5V direct current be added to the input of optocoupler N2 on the one hand by resistance R 1, and the voltage of N2 output is dragged down, and makes Switching Power Supply continue to close; Be added to the base stage of triode V3 on the other hand by resistance R 9, make triode V3 conducting.The conducting of triode V3 descends its collector voltage, cause the base stage of triode V4 to be in low level state and end, and then the armature contact that drives relay J 1 disconnects, and makes the main switch power cut-off, avoids accident to take place.At this moment, standby power works on, and keeps controllable silicon SCR 1 and continues conducting, makes the guard mode locking.
When negative voltage output 1 load that connects of main switch power circuit is short-circuited; output voltage is approximately 0V; at this moment; standby power output+the 5V direct current affacts the base stage of triode V2 by divider resistance R8; make its base stage set up enough voltage and conducting; and then making diode VD4 conducting, the course of work after this is identical with the course of work of above-mentioned positive voltage output end short-circuit protection, repeats no more here.
When pulling out power line or turning off standby power supply, protective circuit can unlock, and after pending fault is got rid of, keeps main switch power circuit operate as normal.
By adopting foregoing circuit, realized short-circuit detecting and protection to Switching Power Supply, prevent to cause the generation of accident because of the power supply overload.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (6)
1. household electrical appliance protective circuit of switch power source, comprise the main switch power circuit, the output of described main switch power circuit includes positive voltage output end and negative voltage output, it is characterized in that: the output of described main switch power circuit links to each other with a short-circuit detecting circuit, the output of described short-circuit detecting circuit is connected with a protection and triggers lock-in circuit, realizes the locking to the main switch power circuit state; Input at the main switch power circuit has additional a final controlling element and a standby power, and control end one end of described final controlling element connects the output of standby power, and the other end triggers lock-in circuit by one drive circuit and described protection and links to each other.
2. household electrical appliance protective circuit of switch power source according to claim 1 is characterized in that: described short-circuit detecting circuit includes two diodes (VD1, VD4), two divider resistances (R7, R8) and two triodes (V1, V2) at least; Wherein, the negative pole of diode (VD1) links to each other with the positive voltage output end of main switch power circuit, the negative pole of diode (VD4) links to each other with the collector electrode of triode (V2), and its base stage links to each other with the negative voltage output of main switch power circuit by divider resistance (R7); The positive pole of two diodes (VD1, VD4) all links to each other by the base stage of resistance (R6) with triode (V1); The emitter of described triode (V1) links to each other with the output of standby power, and collector electrode is by resistance (R4) ground connection.
3. household electrical appliance protective circuit of switch power source according to claim 1 and 2; it is characterized in that: described protection triggers lock-in circuit and consists predominantly of a controllable silicon (SCR1); its positive pole links to each other with the output of standby power; negative pole links to each other with described drive circuit, and its control end links to each other with the collector electrode of triode (V1) in the described short-circuit detecting circuit by resistance (R3).
4. household electrical appliance protective circuit of switch power source according to claim 3 is characterized in that: the negative pole that described protection triggers controllable silicon (SCR1) in the lock-in circuit links to each other with the main switch power circuit by an optocoupler (N2).
5. household electrical appliance protective circuit of switch power source according to claim 3 is characterized in that: described drive circuit consists predominantly of two triodes (V3, V4); Wherein, the base stage of triode (V3) links to each other with the negative pole of described controllable silicon (SCR1), and collector electrode links to each other with the base stage of triode (V4) and the output of standby power respectively.
6. household electrical appliance protective circuit of switch power source according to claim 1 or 5; it is characterized in that: described final controlling element adopts a relay (J1); the armature contact of described relay (J1) is serially connected in the input of main switch power circuit, and its control end is serially connected between the collector electrode of triode (V4) in the output of described standby power and the drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320121011 CN2660754Y (en) | 2003-11-28 | 2003-11-28 | Mains protective circuit of household electrical appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320121011 CN2660754Y (en) | 2003-11-28 | 2003-11-28 | Mains protective circuit of household electrical appliances |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2660754Y true CN2660754Y (en) | 2004-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320121011 Expired - Fee Related CN2660754Y (en) | 2003-11-28 | 2003-11-28 | Mains protective circuit of household electrical appliances |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2660754Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338858A (en) * | 2010-07-27 | 2012-02-01 | 上海梅山钢铁股份有限公司 | Detection and control device for pull-cord switch |
| CN102420421A (en) * | 2011-12-12 | 2012-04-18 | 江苏中凌高科技有限公司 | Direct-current output short-circuit protection circuit for high-frequency switching power supply |
-
2003
- 2003-11-28 CN CN 200320121011 patent/CN2660754Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338858A (en) * | 2010-07-27 | 2012-02-01 | 上海梅山钢铁股份有限公司 | Detection and control device for pull-cord switch |
| CN102338858B (en) * | 2010-07-27 | 2014-10-29 | 上海梅山钢铁股份有限公司 | Detection and control device for pull-cord switch |
| CN102420421A (en) * | 2011-12-12 | 2012-04-18 | 江苏中凌高科技有限公司 | Direct-current output short-circuit protection circuit for high-frequency switching power supply |
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| 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 |