CN206490588U - A kind of circuit for power supply IC protection ends - Google Patents
A kind of circuit for power supply IC protection ends Download PDFInfo
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- CN206490588U CN206490588U CN201621453959.1U CN201621453959U CN206490588U CN 206490588 U CN206490588 U CN 206490588U CN 201621453959 U CN201621453959 U CN 201621453959U CN 206490588 U CN206490588 U CN 206490588U
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Abstract
The utility model discloses a kind of circuit for power supply IC protection ends, belong to field of switch power.It includes transformer, PWM controller, feedback optocoupler, MOSFET main switches, main switch radiator, the PWM controller model NCP1337, there are BO, FB, CS, GND, DRV, VCC, HV pin, clamp diode is accessed between the BO pins and GND pin end, the main switch radiator is directly connected to GND pin end.By accessing clamp diode between BO pins and GND pin end, it is capable of the level of nip BO pins, realizes the control of input overvoltage/undervoltage, interference free performance enhancing has protective effect in itself to PWM controller chip；Main switch radiator directly connects the GND pin end after input rectifying, the external conduction and radiation of suppression common mode noise.
Description
Technical field
The utility model is related to a kind of circuit for power supply IC protection ends, belongs to field of switch power.
Background technology
At present, the circuit of power supply IC protection ends is general by transformer, PWM controller, feedback optocoupler, MOSFET main switches
Pipe, main switch radiator, and multiple resistance, electric capacity, diode composition, this current technology of power supply IC protection circuits into
It is ripe, it is widely used, wherein PWM controller model typically selects NCP1337, and NCP1337 is that a kind of enhanced quasi-resonance pulse is wide
Degree modulation current mode controller, with 500mA peak point current driving forces, can directly drive drain current within 15A
High-voltage MOSFET power switch pipe.Thus chip composition Switching Power Supply or power supply adaptor, with small volume, efficiency high, into
This low advantage, has been widely used in the electrical equipment such as adapter, liquid crystal colour display screen, lcd-tv.But in actual application
It was found that, because the BO pins of PWM controller do not have overvoltage/undervoltage control protection, cause its interference free performance poor, be easily damaged；This
Outside, the common-mode noise externally conducted and radiated occurs in main switch radiator.
Utility model content
Technical problem to be solved in the utility model is：A kind of circuit for power supply IC protection ends is provided, it is solved
The BO pins for PWM controller of having determined do not have overvoltage/undervoltage control protection and main switch radiator externally conduction easily occur and radiate
Common-mode noise the problem of.
Technical problem to be solved in the utility model takes following technical scheme to realize：
A kind of circuit for power supply IC protection ends, it includes transformer, PWM controller, feedback optocoupler, MOSFET master
Switching tube, main switch radiator, and first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th electricity
Resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first commutation diode, the pole of the second rectification two
Pipe, voltage-regulator diode, the PWM controllers model NCP1337 have BO, FB, CS, GND, DRV, VCC, HV pin, wherein
BO pins are connected by the anode of first resistor and transformer, and BO pins pass through second resistance and GND pin end
Connection, second resistance two ends are parallel with the first electric capacity, and FB pins are connected with feedback optocoupler, and CS pins are distinguished by 3rd resistor
MOSFET main switches and the 4th resistance are connected, the 4th resistance is connected with GND leads ends, GND pin is by the second electric capacity with becoming
Depressor primary coil anode is connected, and DRV pins are connected with MOSFET main switches, MOSFET main switches and primary line
The negative terminal of the negative terminal connection of circle, main switch radiator and transformer is by the 3rd capacitance connection, and VCC pin passes through
4th capacity earth, HV pins are connected by the 5th resistance with transformer anode, transformer secondary coil it is positive and negative
The first commutation diode and the 5th electric capacity are in series between end, the first commutation diode negative pole is also associated with the 6th resistance, second
Commutation diode, voltage-regulator diode, voltage-regulator diode ground connection, clamp diode is accessed between the BO pins and GND pin end,
The main switch radiator is directly connected to GND leads ends.
As preferred embodiment, the clamp diode is that two identical diode series aiding connections are formed.
The beneficial effects of the utility model are：, can by accessing clamp diode between BO pins and GND pin end
The level of nip BO pins, realizes the control of input overvoltage/undervoltage, and interference free performance enhancing has guarantor in itself to PWM controller chip
Shield is acted on；Main switch radiator directly connects the GND pin end after input rectifying, the external conduction of suppression common mode noise and spoke
Penetrate.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
In figure：Transformer 1, PWM controller 2, feedback optocoupler 3, MOSFET main switches 4, main switch radiator 5, the
One resistance 61, second resistance 62,3rd resistor 63, the 4th resistance 64, the 5th resistance 65, the 6th resistance 66, the first electric capacity 71, the
Two electric capacity 72, the 3rd electric capacity 73, the 4th electric capacity 74, the 5th electric capacity 75, the first commutation diode 81, the second commutation diode 82,
Voltage-regulator diode 83, clamp diode 9.
Embodiment
In order to be easy to understand to technological means of the present utility model, creation characteristic, reached purpose and effect, tie below
Conjunction is specifically illustrating, and the utility model is expanded on further.
As shown in figure 1, a kind of circuit for power supply IC protection ends, it includes transformer 1, PWM controller 2, feedback light
Coupling 3, MOSFET main switches 4, main switch radiator 5, and first resistor 61, second resistance 62,3rd resistor 63,
Four resistance 64, the 5th resistance 65, the 6th resistance 66, the first electric capacity 71, the second electric capacity 72, the 3rd electric capacity 73, the 4th electric capacity 74,
Five electric capacity 75, the first commutation diode 81, the second commutation diode 82, voltage-regulator diode 83, the model of PWM controller 2
NCP1337, there is BO, FB, CS, GND, DRV, VCC, HV pin, and wherein BO pins pass through first resistor 61 and the primary line of transformer 1
The anode connection of circle, BO pins are connected by second resistance 62 and GND leads ends, and the two ends of second resistance 62 are parallel with the first electricity
Hold 71, FB pins and be connected with feedback optocoupler 3, CS pins connect MOSFET main switches 4 and the 4th respectively by 3rd resistor 63
Resistance 64, the 4th resistance 64 is connected with GND pin end, and GND pin is connected by the second electric capacity 72 and the primary coil anode of transformer 1
Connect, DRV pins are connected with MOSFET main switches 4, MOSFET main switches 4 are connected with the negative terminal of the primary coil of transformer 1, it is main
Switch tube radiator 5 is connected with the negative terminal of the primary coil of transformer 1 by the 3rd electric capacity 73, and VCC pin passes through the 4th electric capacity 74
Ground connection, HV pins are connected by the 5th resistance 65 with the primary coil anode of transformer 1, the positive and negative terminal of the secondary coil of transformer 1 it
Between be in series with the first commutation diode 81 and the 5th electric capacity 75, the negative pole of the first commutation diode 81 be also associated with the 6th resistance 66,
Second commutation diode 82, voltage-regulator diode 83, voltage-regulator diode 83 are grounded, it is characterised in that：BO pins and GND pin end it
Between access clamp diode 9, main switch radiator is directly connected to GND leads ends.Clamp diode 9 is two identicals
Diode series aiding connection is formed.
By accessing clamp diode 9 between BO pins and GND pin end, it is capable of the level of nip BO pins, realizes
The control of overvoltage/undervoltage is inputted, interference free performance enhancing has protective effect in itself to the chip of PWM controller 2；Main switch radiator
5 directly connect the GND pin end after input rectifying, the external conduction and radiation of suppression common mode noise.
General principle of the present utility model and principal character and advantage of the present utility model has been shown and described above.One's own profession
The technical staff of industry it should be appreciated that the utility model is not restricted to the described embodiments, do not depart from the utility model spirit and
On the premise of scope, the utility model also has various changes and modifications, and these changes and improvements both fall within the utility model will
In the range of asking protection.Scope is claimed by appended claims and its equivalent thereof in the utility model.
Claims (2)
1. a kind of circuit for power supply IC protection ends, it include transformer (1), PWM controller (2), feedback optocoupler (3),
MOSFET main switches (4), main switch radiator (5), and first resistor (61), second resistance (62), 3rd resistor
(63), the 4th resistance (64), the 5th resistance (65), the 6th resistance (66), the first electric capacity (71), the second electric capacity (72), the 3rd electricity
Hold (73), the 4th electric capacity (74), the 5th electric capacity (75), the first commutation diode (81), the second commutation diode (82), voltage stabilizing two
Pole pipe (83), PWM controller (2) the model NCP1337, has BO, FB, CS, GND, DRV, VCC, HV pin, wherein BO draws
Pin is connected by first resistor (61) with the anode of transformer (1) primary coil, and BO pins are drawn by second resistance (62) and GND
Foot is connected, and second resistance (62) two ends are parallel with the first electric capacity (71), and FB pins are connected with feedback optocoupler (3), and CS pins lead to
Cross 3rd resistor (63) and connect MOSFET main switches (4) and the 4th resistance (64), the 4th resistance (64) and GND pin end respectively
Connection, GND pin is connected by the second electric capacity (72) with transformer (1) primary coil anode, DRV pins and MOSFET main switches
Manage (4) connection, MOSFET main switches (4) are connected with the negative terminal of transformer (1) primary coil, main switch radiator (5) and
The negative terminal of transformer (1) primary coil is connected by the 3rd electric capacity (73), and VCC pin is grounded by the 4th electric capacity (74), and HV draws
Pin is connected by the 5th resistance (65) with transformer (1) primary coil anode, is gone here and there between the positive and negative terminal of transformer (1) secondary coil
The first commutation diode (81) and the 5th electric capacity (75) are associated with, the first commutation diode (81) negative pole is also associated with the 6th resistance
(66), the second commutation diode (82), voltage-regulator diode (83), voltage-regulator diode (83) ground connection, it is characterised in that：The BO draws
Clamp diode (9) is accessed between pin and GND pin end, the main switch radiator is directly connected to GND pin end.
2. a kind of circuit for power supply IC protection ends according to claim 1, it is characterised in that：The clamp diode
(9) formed for two identical diode series aiding connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621453959.1U CN206490588U (en) | 2016-12-28 | 2016-12-28 | A kind of circuit for power supply IC protection ends |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621453959.1U CN206490588U (en) | 2016-12-28 | 2016-12-28 | A kind of circuit for power supply IC protection ends |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206490588U true CN206490588U (en) | 2017-09-12 |
Family
ID=59770228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621453959.1U Active CN206490588U (en) | 2016-12-28 | 2016-12-28 | A kind of circuit for power supply IC protection ends |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206490588U (en) |
-
2016
- 2016-12-28 CN CN201621453959.1U patent/CN206490588U/en active Active
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