CN207321108U - The HV pins protection circuit of pwm chip - Google Patents
The HV pins protection circuit of pwm chip Download PDFInfo
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- CN207321108U CN207321108U CN201721256677.7U CN201721256677U CN207321108U CN 207321108 U CN207321108 U CN 207321108U CN 201721256677 U CN201721256677 U CN 201721256677U CN 207321108 U CN207321108 U CN 207321108U
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- pwm chip
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Abstract
The HV pins protection circuit of pwm chip; including high-voltage capacitance filter circuit and chip; high-voltage capacitance filter circuit side is connected with pwm chip high input voltage circuit; pwm chip high input voltage circuit connects the HV pins of chip; pwm chip high input voltage circuit includes first resistor, first resistor, the first capacitance and the second capacitance; the input terminal of pwm chip high input voltage circuit is connected with three-phase and four-line rectification input; output terminal connects high-voltage capacitance filter circuit, and output terminal is between the first capacitance and the second capacitance.The utility model has the advantages that：First capacitance and the second capacitance can complete the half of voltage so that and the 5th resistance is only 1 μ A through overcurrent, so the power consumption of all devices in pwm chip high input voltage circuit will not be burnt out.
Description
Technical field
The utility model belongs to field of switch power, and in particular to the HV pins protection circuit of pwm chip.
Background technology
As shown in Figure 1, Switching Power Supply PWM control chips N1, No. 7 pin HV therein are high voltage input terminal, pressure-resistant to be
700V, but southern network technology specification is distinctly claimed terminal and needs to work normally under 2 times of UN, i.e. 1074V, needs to increase at this time
One protection circuit deprotects this chip and endures No. 7 pin HV.
This is pervious way as shown in the block diagram 1 of Fig. 1, and wherein diac VD1 is that low pressure opens in order to prevent
It is dynamic, diac VD3 be for high pressure clamper, and when voltage is up to 1027V, the work(of the 5th resistance R5 of this circuit
Consumption increase causes the 5th resistance R5 often to damage.
The content of the invention
For deficiency of the prior art, the utility model provides the HV pins protection circuit of pwm chip, to solve
The problem of existing protection circuit, the power consumption increase of the 5th resistance R5 causes the 5th resistance R5 often to damage.
The utility model is achieved through the following technical solutions.
The HV pins protection circuit of pwm chip, including high-voltage capacitance filter circuit and chip, the high-voltage capacitance
Filter circuit side is connected with pwm chip high input voltage circuit, pwm chip high input voltage circuit connection core
The HV pins of piece, the pwm chip high input voltage circuit include first resistor, first resistor, the first capacitance and second
Capacitance, the input terminal of the pwm chip high input voltage circuit are connected with three-phase and four-line rectification input, and output terminal connection is high
Voltage capacitance filter circuit, the output terminal is between the first capacitance and the second capacitance.
Preferably, one end of the first resistor is connected with three-phase and four-line rectification input, the 4th electricity of other end connection
One end of resistance, the other end connection three-phase and four-line rectification input of the 4th resistance, the first electricity of one end connection of first capacitance
One end of resistance, the other end of first capacitance connect one end of the second capacitance, the 4th electricity of other end connection of the second capacitance
The other end of resistance.
Preferably, one end connection high-voltage capacitance filter circuit of second capacitance.
Preferably, the high-voltage capacitance filter circuit includes diac and the 5th resistance, described is double
Connect to breakdown diode and the 5th resistance, one end of the diac connects one end of the second capacitance.
Preferably, the model FAN6605 of the chip.
Compared with prior art：When voltage is less than voltage is set, circuit does not work, and power attenuation is almost 0, and voltage is higher than
When setting voltage, metal-oxide-semiconductor, TVS pipe are by voltage clamping to setting voltage so that rear terminal voltage is all setting below voltage.
Brief description of the drawings
Fig. 1 is that the circuit of the utility model connects block diagram.
Fig. 2 is the circuit connection diagram of the prior art of the utility model.
Embodiment
Below in conjunction with the accompanying drawings with embodiment, the utility model is described further.
The HV pins protection circuit of pwm chip, including high-voltage capacitance filter circuit 1 and chip N1, it is characterised in that
1 side of high-voltage capacitance filter circuit is connected with pwm chip high input voltage circuit 2, and the pwm chip is high
Input circuit 2 is pressed to connect the HV pins of chip N1, the pwm chip high input voltage circuit 2 includes first resistor R1, the
One resistance R5, the first capacitance CE1 and the second capacitance CE2, the input terminal connection of the pwm chip high input voltage circuit 2
Have a three-phase and four-line rectification input, output terminal connection high-voltage capacitance filter circuit 1, the output terminal be located at the first capacitance CE1 with
Between second capacitance CE2, one end of the first resistor R1 is connected with three-phase and four-line rectification input, the 4th electricity of other end connection
Hinder one end of R4, the other end connection three-phase and four-line rectification input of the 4th resistance R4, one end connection of the first capacitance CE1
One end of first resistor R1, the other end of the first capacitance CE1 connect one end of the second capacitance CE2, the second capacitance CE2's
The other end connects the other end of the 4th resistance R4, one end connection high-voltage capacitance filter circuit 1 of the second capacitance CE2, institute
The high-voltage capacitance filter circuit 1 stated includes diac VD1 and the 5th resistance R5, the diac
VD1 and the 5th resistance R5 series connection, one end of the diac VD1 connects one end of the second capacitance CE2, described
The model FAN6605 of chip N1.
Borrow the first capacitance CE1 and the second capacitance CE2 high-voltage capacitances carries out 1/2 partial pressure, can thus reach i.e.
When to make three-phase and four-line rectified input voltage be 1027V, the HV pins of chip N1 will not reach 700V, and high-voltage capacitance filters
After circuit 1 and pwm chip high input voltage circuit 2 start, the electric current in pwm chip high input voltage circuit 2 is only 1 μ
A, so the power consumption of all devices in pwm chip high input voltage circuit 2 will not be burnt out.The protection model of the utility model
Enclose including but not limited to embodiment of above, the scope of protection of the utility model is subject to claims, any to this technology
Replacement that the those skilled in the art made is readily apparent that, deformation, improvement each fall within the scope of protection of the utility model.
Claims (5)
1. the HV pins protection circuit of pwm chip, including high-voltage capacitance filter circuit（1）And chip（N1）, its feature exists
In the high-voltage capacitance filter circuit（1）Side is connected with pwm chip high input voltage circuit（2）, described PWM controls
Coremaking piece high input voltage circuit（2）Connect chip（N1）HV pins, the pwm chip high input voltage circuit（2）Bag
Include first resistor（R1）, first resistor（R5）, the first capacitance（CE1）With the second capacitance（CE2）, the pwm chip is high
Press input circuit（2）Input terminal be connected with three-phase and four-line rectification input, output terminal connection high-voltage capacitance filter circuit（1）, institute
The output terminal stated is located at the first capacitance（CE1）With the second capacitance（CE2）Between.
2. the HV pins protection circuit of pwm chip according to claim 1, it is characterised in that first electricity
Resistance（R1）One end be connected with three-phase and four-line rectification input, the other end connect the 4th resistance（R4）One end, the 4th resistance（R4）
Other end connection three-phase and four-line rectification input, first capacitance（CE1）One end connection first resistor（R1）One end,
First capacitance（CE1）The other end connect the second capacitance（CE2）One end, the second capacitance（CE2）The other end connection
4th resistance（R4）The other end.
3. the HV pins protection circuit of pwm chip according to claim 2, it is characterised in that second electricity
Hold（CE2）One end connection high-voltage capacitance filter circuit（1）.
4. the HV pins protection circuit of pwm chip according to claim 3, it is characterised in that the high-voltage electricity
Capacitor filter circuit（1）Including diac（VD1）With the 5th resistance（R5）, the diac（VD1）
With the 5th resistance（R5）Series connection, the diac（VD1）One end connect the second capacitance（CE2）One end.
5. the HV pins protection circuit of pwm chip according to claim 4, it is characterised in that the chip
（N1）Model FAN6605.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721256677.7U CN207321108U (en) | 2017-09-28 | 2017-09-28 | The HV pins protection circuit of pwm chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721256677.7U CN207321108U (en) | 2017-09-28 | 2017-09-28 | The HV pins protection circuit of pwm chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207321108U true CN207321108U (en) | 2018-05-04 |
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ID=62428170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721256677.7U Active CN207321108U (en) | 2017-09-28 | 2017-09-28 | The HV pins protection circuit of pwm chip |
Country Status (1)
| Country | Link |
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| CN (1) | CN207321108U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115174875A (en) * | 2022-09-08 | 2022-10-11 | 深圳市飞思卓科技有限公司 | HDMI high-definition data line and data transmission method |
-
2017
- 2017-09-28 CN CN201721256677.7U patent/CN207321108U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115174875A (en) * | 2022-09-08 | 2022-10-11 | 深圳市飞思卓科技有限公司 | HDMI high-definition data line and data transmission method |
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