CN205123687U - Power protection circuit - Google Patents
Power protection circuit Download PDFInfo
- Publication number
- CN205123687U CN205123687U CN201521015027.4U CN201521015027U CN205123687U CN 205123687 U CN205123687 U CN 205123687U CN 201521015027 U CN201521015027 U CN 201521015027U CN 205123687 U CN205123687 U CN 205123687U
- Authority
- CN
- China
- Prior art keywords
- spdt
- pole double
- throw switch
- short circuit
- indicator light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a power protection circuit, including a short circuit pilot lamp L1 and a switch S1, switch S1's both ends are connected with short circuit pilot lamp L1's both ends respectively, short circuit pilot lamp L1's the one end and the live wire of commercial power are connected, short circuit pilot lamp L1's the other end and the zero line of commercial power are the power output end. This power protection circuit can prevent that the power amplifier short circuit from damaging.
Description
Technical field
The utility model relates to a kind of protective circuit technical field, is specifically a kind of power protecting circuit when detecting for preventing power amplifier to be burned.
Background technology
At present when detection power amplifier, the power supply of power amplifier is directly connected with civil power, then power amplifier is connected with oscilloscope, audio analyzer again.And by the input of power amplifier access load, at the output access oscilloscope of power amplifier, audio analyzer whether normal carry out the relevant parameter of detection power amplifier by some diverter switches.Power supply due to power amplifier is directly connected with civil power, if short circuit appears in the inside of power amplifier when therefore detecting, then directly power amplifier can be burnt out, thus cause damage.Therefore, for these reasons, urgently need a kind of power protecting circuit, this power protecting circuit can prevent the damage of power amplifier and testing equipment, to solve the problem.
Utility model content
The technical problems to be solved in the utility model is, provides a kind of power protecting circuit, and this power protecting circuit can prevent power amplifier Damage by Short Circuit.
The technical solution of the utility model is, provides a kind of power protecting circuit, comprises a short circuit indicator light L1 and a switch S 1; The two ends of described switch S 1 are connected with the two ends of short circuit indicator light L1 respectively; One end of described short circuit indicator light L1 is connected with the live wire of civil power, and the described other end of short circuit indicator light L1 and the zero line of civil power are power output end.
Described power protecting circuit also comprises voltage commutation circuit, between one end that described voltage commutation circuit is arranged on short circuit indicator light L1 and civil power.
Described voltage commutation circuit comprises transformer TF1, single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12; The primary side of described transformer TF1 is electrically connected with city; Two terminals of described transformer TF1 secondary side are connected with a tie point of single-pole double-throw switch (SPDT) SW11, a tie point of single-pole double-throw switch (SPDT) SW12 respectively; Another tie point of described single-pole double-throw switch (SPDT) SW11, another tie point of single-pole double-throw switch (SPDT) SW12 are electrically connected with city; The points of common connection of described single-pole double-throw switch (SPDT) SW11 is connected with one end of short circuit indicator light L1; The points of common connection of described single-pole double-throw switch (SPDT) SW12, the other end of short circuit indicator light L1 are power output end.
Described power protecting circuit also comprises LED indicating circuit, and described LED indicating circuit is connected with one end of short circuit indicator light L1.
Described LED indicating circuit comprises single-pole double-throw switch (SPDT) SW13, the LED1 lamp of different colours and LED2 lamp; The points of common connection of described single-pole double-throw switch (SPDT) SW13 is connected with one end of short circuit indicator light L1; Described single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12, single-pole double-throw switch (SPDT) SW13 form a triac device, three Chang Kaiduan of described triac device are connected with the anode of live wire, LED2 lamp, and three normal-closed ends of described triac device are connected with the secondary side of transformer TF1, the anode of LED1 lamp; The negative electrode of described LED1 lamp is connected with one end of resistance R1, and the negative electrode of described LED2 lamp is connected with one end of resistance R2; The other end of described resistance R1, the other end of resistance R2 are electrically connected with city.
After adopting above structure, the utility model compared with prior art, has the following advantages:
The two ends of the switch S 1 of the utility model power protecting circuit are connected with the two ends of short circuit indicator light L1 respectively; One end of short circuit indicator light L1 is connected with the live wire of civil power, and the described other end of short circuit indicator light L1 and the zero line of civil power are power output end.When connecting power supply, first switch S 1 being in notconnect state, then connecting power supply.If short-circuit state appears at this moment detected power amplifier, then load current can be added on short circuit indicator light L1, make short circuit indicator light L1 light to remind tester's power-off and prevent power amplifier to be burned, thus avoid loss.
As improvement, described power protecting circuit also comprises voltage commutation circuit, between one end that described voltage commutation circuit is arranged on short circuit indicator light L1 and civil power.Different voltage can be adapted to by this voltage commutation circuit, thus make the scope of application of the utility model power protecting circuit wider.
As improvement, described power protecting circuit also comprises LED indicating circuit, and described LED indicating circuit is connected with one end of short circuit indicator light L1.Operator can be made to be well understood to the voltage of this device work by LED indicating circuit.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model power protecting circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of power protecting circuit of the utility model, comprises a short circuit indicator light L1 and a switch S 1; The two ends of described switch S 1 are connected with the two ends of short circuit indicator light L1 respectively; One end of described short circuit indicator light L1 is connected with the live wire of civil power, and the described other end of short circuit indicator light L1 and the zero line of civil power are power output end.
Described power protecting circuit also comprises voltage commutation circuit, between one end that described voltage commutation circuit is arranged on short circuit indicator light L1 and civil power.
Described voltage commutation circuit comprises transformer TF1, single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12; The primary side of described transformer TF1 is electrically connected with city; Two terminals of described transformer TF1 secondary side are connected with a tie point of single-pole double-throw switch (SPDT) SW11, a tie point of single-pole double-throw switch (SPDT) SW12 respectively; Another tie point of described single-pole double-throw switch (SPDT) SW11, another tie point of single-pole double-throw switch (SPDT) SW12 are electrically connected with city; The points of common connection of described single-pole double-throw switch (SPDT) SW11 is connected with one end of short circuit indicator light L1; The points of common connection of described single-pole double-throw switch (SPDT) SW12, the other end of short circuit indicator light L1 are power output end.
Described power protecting circuit also comprises LED indicating circuit, and described LED indicating circuit is connected with one end of short circuit indicator light L1.
Described LED indicating circuit comprises single-pole double-throw switch (SPDT) SW13, the LED1 lamp of different colours and LED2 lamp; The points of common connection of described single-pole double-throw switch (SPDT) SW13 is connected with one end of short circuit indicator light L1; Described single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12, single-pole double-throw switch (SPDT) SW13 form a triac device, three Chang Kaiduan of described triac device are connected with the anode of live wire, LED2 lamp, and three normal-closed ends of described triac device are connected with the secondary side of transformer TF1, the anode of LED1 lamp; The negative electrode of described LED1 lamp is connected with one end of resistance R1, and the negative electrode of described LED2 lamp is connected with one end of resistance R2; The other end of described resistance R1, the other end of resistance R2 are electrically connected with city.
Below only just most preferred embodiment of the present utility model is described, but can not be interpreted as it is limitations on claims.The utility model is not limited only to above embodiment, and its concrete structure allows to change.In every case the various change done in the protection range of the utility model independent claims is all in protection range of the present utility model.
Claims (5)
1. a power protecting circuit, is characterized in that: comprise a short circuit indicator light L1 and a switch S 1; The two ends of described switch S 1 are connected with the two ends of short circuit indicator light L1 respectively; One end of described short circuit indicator light L1 is connected with the live wire of civil power, and the described other end of short circuit indicator light L1 and the zero line of civil power are power output end.
2. power protecting circuit according to claim 1, is characterized in that: described power protecting circuit also comprises voltage commutation circuit, between one end that described voltage commutation circuit is arranged on short circuit indicator light L1 and civil power.
3. power protecting circuit according to claim 2, is characterized in that: described voltage commutation circuit comprises transformer TF1, single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12; The primary side of described transformer TF1 is electrically connected with city; Two terminals of described transformer TF1 secondary side are connected with a tie point of single-pole double-throw switch (SPDT) SW11, a tie point of single-pole double-throw switch (SPDT) SW12 respectively; Another tie point of described single-pole double-throw switch (SPDT) SW11, another tie point of single-pole double-throw switch (SPDT) SW12 are electrically connected with city; The points of common connection of described single-pole double-throw switch (SPDT) SW11 is connected with one end of short circuit indicator light L1; The points of common connection of described single-pole double-throw switch (SPDT) SW12, the other end of short circuit indicator light L1 are power output end.
4. power protecting circuit according to claim 3, is characterized in that: described power protecting circuit also comprises LED indicating circuit, and described LED indicating circuit is connected with one end of short circuit indicator light L1.
5. power protecting circuit according to claim 4, is characterized in that: described LED indicating circuit comprises single-pole double-throw switch (SPDT) SW13, the LED1 lamp of different colours and LED2 lamp; The points of common connection of described single-pole double-throw switch (SPDT) SW13 is connected with one end of short circuit indicator light L1; Described single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12, single-pole double-throw switch (SPDT) SW13 form a triac device, three Chang Kaiduan of described triac device are connected with the anode of live wire, LED2 lamp, and three normal-closed ends of described triac device are connected with the secondary side of transformer TF1, the anode of LED1 lamp; The negative electrode of described LED1 lamp is connected with one end of resistance R1, and the negative electrode of described LED2 lamp is connected with one end of resistance R2; The other end of described resistance R1, the other end of resistance R2 are electrically connected with city.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521015027.4U CN205123687U (en) | 2015-12-09 | 2015-12-09 | Power protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521015027.4U CN205123687U (en) | 2015-12-09 | 2015-12-09 | Power protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205123687U true CN205123687U (en) | 2016-03-30 |
Family
ID=55579258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521015027.4U Expired - Fee Related CN205123687U (en) | 2015-12-09 | 2015-12-09 | Power protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205123687U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107783004A (en) * | 2016-08-30 | 2018-03-09 | 迈普通信技术股份有限公司 | Switching Power Supply product input short-circuit test device and method |
-
2015
- 2015-12-09 CN CN201521015027.4U patent/CN205123687U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107783004A (en) * | 2016-08-30 | 2018-03-09 | 迈普通信技术股份有限公司 | Switching Power Supply product input short-circuit test device and method |
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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: 20160330 Termination date: 20201209 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |