CN213990489U - Power supply circuit with prevent exploding quick-witted function - Google Patents
Power supply circuit with prevent exploding quick-witted function Download PDFInfo
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- CN213990489U CN213990489U CN202022822925.8U CN202022822925U CN213990489U CN 213990489 U CN213990489 U CN 213990489U CN 202022822925 U CN202022822925 U CN 202022822925U CN 213990489 U CN213990489 U CN 213990489U
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Abstract
The utility model discloses a power supply circuit with prevent machine of exploding function, it includes power control chip, transformer and connects between power control chip and transformer and as electronic switch' S MOS pipe, and the transformer is connected to the D utmost point of this MOS pipe, and the power control chip is connected to the G utmost point of this MOS pipe, and ground connection behind the first current-limiting resistor of S utmost point connection of this MOS pipe, first current-limiting resistor both ends parallel connection has and is used for preventing that first current-limiting resistor is unusual and the TVS diode of machine of exploding appears. The utility model discloses set up first current-limiting resistor on the S pole of MOS pipe, control output current' S size through first current-limiting resistor, a TVS diode that connects in parallel on first current-limiting resistor, this TVS diode can prevent abnormal test or during operation, avoids appearing too big electric current on the first current-limiting resistor and leads to exploding the machine, uses safelyr, and guarantees product life, the order the utility model discloses extremely strong market competition has.
Description
The technical field is as follows:
the utility model relates to an electronic circuit technical field refers in particular to a power supply circuit with prevent exploding quick-witted function.
Background art:
the existing power supply or charger generally adopts a power supply control chip to control the conduction of an MOS tube, so that a transformer is grounded and conducted, the power supply control chip outputs PWM signals for the transformer, at the moment, the S pole of the MOS tube limits the output current of the power supply through a current-limiting resistor, when the current-limiting resistor is abnormal, the resistance value of the current-limiting resistor is close to 0, and at the moment, the abnormal work of the power supply can be caused to explode, thereby affecting the product quality.
In view of the above, the present inventors propose the following.
The utility model has the following contents:
an object of the utility model is to overcome prior art not enough, provide a power supply circuit with prevent frying function.
In order to solve the technical problem, the utility model discloses a following technical scheme: this power supply circuit with prevent exploding quick-witted function includes power control chip, transformer and connects between power control chip and transformer and as electronic switch' S MOS pipe, and the transformer is connected to the D utmost point of this MOS pipe, and the power control chip is connected to the G utmost point of this MOS pipe, and the S utmost point of this MOS pipe is connected first current-limiting resistance back ground connection, first current-limiting resistance both ends are parallelly connected to have and are used for preventing that first current-limiting resistance is unusual and the TVS diode that explodes the machine appears.
Further, in the above technical solution, the power control chip is a multi-mode PWM controller, and its model is LD 5523P/Q.
Further, in the above technical solution, two ends of the first current limiting resistor are connected in parallel with a second current limiting resistor.
Further, in the above technical solution, a resistor R6 is connected between the S pole and the G pole of the MOS transistor.
In the above technical solution, the G-pole of the MOS transistor is connected to the resistor R8 and then connected to the DRV pin of the power control chip, and both ends of the resistor R8 are connected in parallel to the resistor R4 and the diode D1, the anode of the diode D1 is connected to the resistor R4, and the cathode of the diode D1 is connected to the resistor R8 and the DRV pin of the power control chip.
Furthermore, in the above technical solution, the CS pin of the power control chip is connected to the capacitor C1 and then grounded, and the CS pin is connected to the resistor R3 and then connected to the S-pole of the MOS transistor.
After the technical scheme is adopted, compared with the prior art, the utility model has following beneficial effect: the utility model discloses set up first current-limiting resistor on the S pole of MOS pipe, control output current' S size through first current-limiting resistor, a TVS diode that connects in parallel on first current-limiting resistor, this TVS diode can prevent abnormal test or during operation, avoids appearing too big electric current on the first current-limiting resistor and leads to exploding the machine, uses safelyr, and guarantees product life, the order the utility model discloses extremely strong market competition has.
Description of the drawings:
fig. 1 is a circuit diagram of the present invention.
The specific implementation mode is as follows:
the present invention will be further described with reference to the following specific embodiments and accompanying drawings.
As shown in fig. 1, the power circuit with a function of preventing a machine from being exploded includes a power control chip 1, a transformer 2, and a MOS transistor 3 connected between the power control chip 1 and the transformer 2 and serving as an electronic switch, a D pole of the MOS transistor 3 is connected to the transformer 2, a G pole of the MOS transistor 3 is connected to the power control chip 1, an S pole of the MOS transistor 3 is connected to a first current-limiting resistor 4 and then grounded, and TVS diodes 5 for preventing the machine from being exploded due to abnormality of the first current-limiting resistor 4 are connected in parallel to two ends of the first current-limiting resistor 4. The utility model discloses set up first current-limiting resistor on the S pole of MOS pipe, control output current' S size through first current-limiting resistor, a TVS diode that connects in parallel on first current-limiting resistor, this TVS diode can prevent abnormal test or during operation, avoids appearing too big electric current on the first current-limiting resistor and leads to exploding the machine, uses safelyr, and guarantees product life, the order the utility model discloses extremely strong market competition has.
The power control chip 1 is a multi-mode PWM controller with model number LD 5523P/Q.
And a second current limiting resistor 6 is connected in parallel with two ends of the first current limiting resistor 4.
A resistor R6 is connected between the S pole and the G pole of the MOS tube 3. The G pole of the MOS transistor 3 is connected with a resistor R8 and then connected with a DRV pin of the power control chip 1, two ends of the resistor R8 are connected with a resistor R4 and a diode D1 in parallel, the anode of the diode D1 is connected with a resistor R4, the cathode of the diode D1 is connected with a resistor R8 and the DRV pin of the power control chip 1, and the diode D1 and the resistor R4 play a role in protection.
The CS pin of the power control chip 1 is connected with a capacitor C1 and then grounded, and the CS pin is connected with a resistor R3 and then connected with the S pole of the MOS tube 3.
To sum up, the utility model discloses set up first current-limiting resistor on the S pole of MOS pipe, control output current' S size through first current-limiting resistor, a TVS diode that connects in parallel on first current-limiting resistor, this TVS diode can prevent abnormal test or during operation, avoids appearing too big electric current on the first current-limiting resistor and leads to exploding the machine, uses safelyr, and guarantees product life, the order the utility model discloses extremely strong market competition has.
Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.
Claims (6)
1. The utility model provides a power supply circuit with prevent exploding quick-witted function, it includes power control chip (1), transformer (2) and connect between power control chip (1) and transformer (2) and as electronic switch' S MOS pipe (3), transformer (2) are connected to the D utmost point of this MOS pipe (3), power control chip (1) is connected to the G utmost point of this MOS pipe (3), ground connection behind first current-limiting resistor (4) is connected to the S utmost point of this MOS pipe (3), its characterized in that: and both ends of the first current limiting resistor (4) are connected in parallel with a TVS diode (5) for preventing the first current limiting resistor (4) from generating explosion due to abnormity.
2. A power supply circuit having a fryer-preventing function according to claim 1, wherein: the power supply control chip (1) is a multi-mode PWM controller, and the model number of the power supply control chip is LD 5523P/Q.
3. A power supply circuit having a fryer-preventing function according to claim 2, wherein: and a second current limiting resistor (6) is connected in parallel with two ends of the first current limiting resistor (4).
4. A power supply circuit having a fryer-preventing function according to claim 3, wherein: and a resistor R6 is connected between the S pole and the G pole of the MOS tube (3).
5. A power supply circuit having a fryer-preventing function according to claim 4, wherein: the G pole of the MOS tube (3) is connected with a resistor R8 and then connected with the DRV pin of the power control chip (1), two ends of the resistor R8 are connected with a resistor R4 and a diode D1 in parallel, the anode of the diode D1 is connected with a resistor R4, and the cathode of the diode D1 is connected with a resistor R8 and the DRV pin of the power control chip (1).
6. A power supply circuit having a fryer-preventing function according to claim 5, wherein: the CS pin of the power control chip (1) is connected with the capacitor C1 and then grounded, and the CS pin is connected with the resistor R3 and then connected with the S pole of the MOS tube (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022822925.8U CN213990489U (en) | 2020-11-30 | 2020-11-30 | Power supply circuit with prevent exploding quick-witted function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022822925.8U CN213990489U (en) | 2020-11-30 | 2020-11-30 | Power supply circuit with prevent exploding quick-witted function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213990489U true CN213990489U (en) | 2021-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022822925.8U Active CN213990489U (en) | 2020-11-30 | 2020-11-30 | Power supply circuit with prevent exploding quick-witted function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213990489U (en) |
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2020
- 2020-11-30 CN CN202022822925.8U patent/CN213990489U/en active Active
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