CN208062779U - Short-circuit fault protection circuit and detection control circuit - Google Patents
Short-circuit fault protection circuit and detection control circuit Download PDFInfo
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- CN208062779U CN208062779U CN201721749574.4U CN201721749574U CN208062779U CN 208062779 U CN208062779 U CN 208062779U CN 201721749574 U CN201721749574 U CN 201721749574U CN 208062779 U CN208062779 U CN 208062779U
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Abstract
The utility model provides a short-circuit fault protection circuit, including flyback control chip, input rectification protection circuit, bleeder circuit, detection control circuit. The voltage input end of the flyback control chip is connected to the output end of the voltage division circuit, and the input end of the voltage division circuit is respectively connected to the live wire and the zero wire of the input rectification protection circuit; the voltage output end of the flyback control chip is connected to the input end of the detection control circuit, and the output end of the detection control circuit is connected to a live wire of the input rectification protection circuit; when the chip pin short circuit, output voltage punctures the zener diode among the detection control circuit and makes the switch tube among the detection control circuit switch on, and then makes the live wire of input rectification protection circuit to ground short circuit, and this circuit will produce great electric current and fuse on the live wire, and the input breaks off with the back stage circuit, and the circuit is closed, and bleeder circuit does not work this moment, and the resistance does not have the risk of generating heat.
Description
Technical field
The utility model is related to field of circuit technology, more particularly to a kind of short-circuit fault protection circuit and detection control electricity
Road.
Background technology
To reduce the stand-by power consumption of Switching Power Supply, most flyback topologies chips are all integrated with high voltage startup function on the market,
Such as flyback control chip LD5760T.Such flyback controls the high voltage startup function of integrated chip mainly in chip high voltage pin
A high-voltage MOS pipe is integrated, when powering on, high-voltage MOS pipe conducting, flyback control chip is powered on, and chip is controlled in flyback
After normal work, high-voltage MOS pipe shutdown, to reduce loss.
Referring to Fig. 1, such chip is commonly used in the high voltage startup of input rectifying protection circuit, and safety test is found.When this
When high voltage startup foot and loop the control foot short circuit of class chip, it can cause to be serially connected in input rectifying protection circuit input AC lines and core
High voltage startup current-limiting resistance Wen Sheng between piece high voltage startup foot has exceeded safety requirements, easily causes danger.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of short-circuit fault protection circuit, technical solution is as follows：
A kind of short-circuit fault protection circuit, the circuit include flyback control chip, input rectifying protection circuit, partial pressure electricity
Control circuit is detected on road, wherein：
The voltage input end of the flyback control chip is connected to the output end of bleeder circuit, the input of the bleeder circuit
End is respectively connected to the firewire and zero curve of input rectifying protection circuit；
The voltage output end of the flyback control chip is connected to detection control circuit input terminal, the detection control circuit
Output end be connected to the firewire of input rectifying protection circuit；
The detection control circuit is used to detect the short circuit fault signal that the voltage output end of flyback control chip is sent out, and
The firewire of input rectifying protection circuit is controlled after receiving short circuit fault signal makes its shorted to earth.
As the improvement of said program, the bleeder circuit, including resistance first resistor, second resistance, 3rd resistor, the
Four resistance, wherein：
One end of 4th resistance is connected to the voltage output end of flyback control chip, and the other end connects after connecting with 3rd resistor
It is connected to first resistor, one end of second resistance；
First resistor, second resistance is in parallel, and first resistor is connected to the zero curve of input rectifying protection circuit, and second resistance connects
It is connected to the firewire of input rectifying protection circuit.
As the improvement of said program, the bleeder circuit further includes the first diode and the second diode；Described first
The anode of diode is connect with the zero curve of the rectification protection circuit, cathode and the first resistor of first diode
One end connects；The anode of second diode is that the firewire of the rectification protection circuit connects, the moon of second diode
Pole is connect with one end of the second resistance.
As the improvement of said program, the detection control circuit includes switching tube, the 5th resistance, capacitance, the three or two pole
Tetra- diodes of Guan Yu, wherein：
5th resistance and capacitance are parallel between the voltage output end and ground of counterattack flyback flyback control chip；
Switching tube includes three ends, the voltage output end of the first end connection counterattack flyback control chip of switching tube, second end
It is connected to the firewire of input rectifying protection circuit, third end ground connection；Third diode and the 4th diode are connected to switching tube
Between first end and the voltage output end of counterattack flyback control chip, and the anode of third diode and the 4th diode mutually interconnects
It connects.
As the improvement of said program, the 4th diode is zener diode.
As the improvement of said program, the switching tube is metal-oxide-semiconductor, and the first end of the switching tube is the grid of metal-oxide-semiconductor
Pole, the second end of the switching tube are the drain electrode of metal-oxide-semiconductor, and the third end of the switching tube is the source electrode of metal-oxide-semiconductor.
Utility model embodiment increases detection control circuit, and the effect of the detection control circuit is to receive flyback control core
Piece transmits short circuit fault signal and controls the firewire L shorted to earths of input rectifying protection circuit, so make the fuse of firewire L because
High current and fuse.No current passes through on bleeder circuit at this time, and solving causes pacifying in the prior art because resistance temperature is excessively high
Problem that cannot be up to standard in full Specification Design, realizes short trouble protection so that entire circuit can meet safety standard design
It is required that.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is that some embodiments described in the utility model for those of ordinary skill in the art can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structure chart of input rectifying protection circuit in the prior art；
Fig. 2 is the structure diagram of the utility model embodiment short-circuit fault protection circuit；
Fig. 3 is the circuit structure diagram of the utility model embodiment short-circuit fault protection circuit.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the utility model.On the contrary, they be only with such as
The example of the consistent device and method of some aspects be described in detail in the appended claims, the utility model.
It is a kind of structure diagram for short-circuit fault protection circuit that the utility model embodiment provides, packet referring to Fig. 2, Fig. 2
It includes：
Flyback controls chip UB, bleeder circuit 100, detection control circuit 200 and input rectifying protection circuit 300.
The input terminal IN1 of the bleeder circuit 100 is separately connected the zero curve N and fire of the input rectifying protection circuit 300
Line L, the output end OUT2 of the bleeder circuit 100 connect the voltage input end IN2 of the flyback control chip UB.
The input terminal IN3 of the detection control circuit 200 connects the voltage output end OUT1 of the flyback control chip UB,
The output end OUT2 of the detection control circuit 200 is connected to the firewire L of the input rectifying protection circuit 300.
The utility model embodiment increases detection control circuit, and the effect of the detection control circuit is to receive flyback control
Chip transmits short circuit fault signal and controls the firewire L shorted to earths of input rectifying protection circuit, and then makes the fuse of firewire L
It fuses because of high current.No current passes through on bleeder circuit at this time, and solve causes because resistance temperature is excessively high in the prior art
Problem that cannot be up to standard in safety standard design, realizes short trouble protection so that entire circuit can meet safety standard design
Requirement.
It is a kind of circuit structure diagram for short-circuit fault protection circuit that the utility model embodiment provides referring to Fig. 3, Fig. 3,
Including：Bleeder circuit 100, flyback control chip UB, detection control circuit 200 and input rectifying protection circuit 300；The flyback
The high voltage startup HV feet for controlling chip UB are the voltage input end IN2 that the flyback controls chip UB, and the flyback controls chip
The loop control COMP feet of UB are the voltage output end OUT1 that the flyback controls chip UB.
The detection control circuit 200 includes switching tube Q1, the 5th resistance R5, capacitance C1, third diode D3 and the 4th
Diode D4；
The second end of switching tube Q1 is connected to the firewire of input rectifying protection circuit, for the detection control circuit 200
Output end OUT2；The first end of switching tube Q1 is separately connected one end of the 5th resistance R5, one end of capacitance and third diode D3
Cathode；Third end, the other end of the 5th resistance R5 and the other end of capacitance of switching tube Q1 is grounded respectively；Third diode D3
Anode is connect with the 4th diode D4 anodes；4th diode D4 cathodes are the input terminal IN3 of the detection control circuit 200,
The voltage output end that chip is controlled with flyback is connected.
Wherein, by way of example, the 4th diode D4 can be zener diode.
Wherein, the switching tube Q1 can be N-channel field-effect tube, at this point, the first end of the switching tube Q1 is N-channel
The grid of field-effect tube, the second end of the switching tube Q1 are the drain electrode of N-channel field-effect tube, the third end of the switching tube Q1
For the source electrode of N-channel field-effect tube.
Wherein bleeder circuit 100, including resistance first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4.
One end of 4th resistance R4 is the output end OUT1 of the bleeder circuit, the voltage output end phase with flyback control chip UB
Connection, the other end are connected to first resistor R1, one end of second resistance R2 after connecting with 3rd resistor R3；First resistor R1, the
Two resistance R2 are in parallel, and first resistor R1 is connected to the zero curve of input rectifying protection circuit, and second resistance R2 is connected to input rectifying
The firewire of protection circuit.
The bleeder circuit 100 further includes the first diode D1 and the first diode D2；The sun of the first diode D1
Pole is connect with the zero curve of the input rectifying protection circuit, one end of the cathode and the first resistor of the first diode D1
Connection；The anode of the first diode D2 is that the firewire of the input rectifying protection circuit connects, the first diode D2
Cathode connect with one end of the second resistance R2.
Wherein, the high voltage startup foot of flyback control chip is the voltage input end that the flyback controls chip, the flyback
The loop control foot for controlling chip is the voltage output end that the flyback controls chip.As an example, the flyback controls chip
The model that UB can be selected includes LD5760T；
Wherein, the GND pins ground connection of the flyback control chip UB.
Specifically, when the high voltage startup foot of flyback control chip UB and loop control foot are not shorted, the inspection
The input terminal IN3 for surveying control circuit 200 does not have input signal, and the 4th diode D4 is not turned at this time, and switching tube Q1 is also not turned on,
Entire detection control circuit 200 does not work；When the high voltage startup foot and loop control foot of flyback control chip UB are shorted
When, flyback controls chip UB output voltage signals to the detection control circuit 200, because the four or two pole D4 is two pole of voltage stabilizing
Pipe, and the voltage signal is more than the critical voltage of the zener diode, therefore the 4th diode D4 is breakdown, at this time
The 4th diode D4 is connected and so that its both end voltage is maintained at the critical voltage constant；The switching tube Q1 is because described in
4th diode D4 conductings, the grid of the switching tube Q1 have input voltage signal, the input voltage signal to believe for high level
Number, switching tube Q1 is connected at this time；The 5th resistance R5 is pull down resistor, and the switching tube Q1 can be prevented because of input voltage mistake
It is big and breakdown；Detection control circuit 200 is started to work after the switching tube Q1 conductings, and detection control circuit is equivalent to conducting wire
By the zero curve of input rectifying protection circuit 300 short circuit over the ground.
Wherein, fuse is housed on the zero curve of input rectifying protection circuit 300, on fuse can because zero curve over the ground short circuit due to
Larger electric current is generated, when this electric current is more than fuse FB1 blow-out current values, blown fuse, power input and rear class
Circuit disconnects, and circuit is closed.The first of bleeder circuit at this time, second, third, the 4th resistance does not work, no fever risk.
Specifically, input rectifying protection circuit include a fuse, a thermistor, an AC input current rectifying and wave filtering circuit,
One EMI protection circuit, the input terminal of the fuse are connected with alternating current input power supplying, output end and the EMI protection circuit
Input terminal be connected；The input terminal of the thermistor is connected with alternating current input power supplying, output end and EMI protection electricity
The input terminal on road is connected；The input terminal of the AC input current rectifying and wave filtering circuit is connected with the output end of EMI protection circuit, defeated
Outlet is grounded.
Obviously, those skilled in the art can carry out the utility model various modification and variations without departing from this practicality
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this practicality is new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this practicality is new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing in the equivalent requirements of the claims will be fallen
All changes in justice and range are included in the utility model.Any reference numeral in claim should not be considered as limitation
Involved claim.Furthermore, it is to be understood that one word of " comprising " is not excluded for other units or step, odd number is not excluded for plural number.Device
The multiple units or device stated in claim can also be realized by a unit or device by software or hardware.The
One, the second equal words are used to indicate names, and are not represented any particular order.
Claims (10)
1. a kind of short-circuit fault protection circuit, which is characterized in that the circuit includes flyback control chip, input rectifying protection electricity
Road, bleeder circuit detect control circuit, wherein：
The voltage input end of the flyback control chip is connected to the output end of bleeder circuit, the input terminal point of the bleeder circuit
It is not connected to the firewire and zero curve of input rectifying protection circuit；
The voltage output end of the flyback control chip is connected to detection control circuit input terminal, described to detect the defeated of control circuit
Outlet is connected to the firewire of input rectifying protection circuit；
The detection control circuit is used to detect the short circuit fault signal that the voltage output end of flyback control chip is sent out, and is connecing
Receiving the firewire of control input rectifying protection circuit after short circuit fault signal makes its shorted to earth.
2. short-circuit fault protection circuit according to claim 1, which is characterized in that the bleeder circuit, including the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, wherein：
One end of 4th resistance is connected to the voltage output end of flyback control chip, and the other end is connected to after connecting with 3rd resistor
First resistor, one end of second resistance；
First resistor, second resistance is in parallel, and first resistor is connected to the zero curve of input rectifying protection circuit, and second resistance is connected to
The firewire of input rectifying protection circuit.
3. short-circuit fault protection circuit as claimed in claim 2, which is characterized in that the bleeder circuit further includes the one or two pole
Pipe and the second diode；The anode of first diode is connect with the zero curve of the rectification protection circuit, the one or two pole
The cathode of pipe is connect with one end of the first resistor；The anode of second diode is the firewire of the rectification protection circuit
Connection, the cathode of second diode are connect with one end of the second resistance.
4. short-circuit fault protection circuit according to claim 1, which is characterized in that the detection control circuit includes switch
Pipe, the 5th resistance, capacitance, third diode and the 4th diode, wherein：
5th resistance and capacitance are parallel between the voltage output end and ground of flyback control chip；
Switching tube includes three ends, and the voltage output end of the first end connection flyback control chip of switching tube, second end is connected to defeated
Enter the firewire of rectification protection circuit, third end ground connection；Third diode and the 4th diode be connected to the first end of switching tube with
Between flyback controls the voltage output end of chip, and the anode of third diode and the 4th diode is connected with each other.
5. short-circuit fault protection circuit according to claim 4, which is characterized in that the 4th diode is two pole of voltage stabilizing
Pipe.
6. short-circuit fault protection circuit according to claim 4, which is characterized in that the switching tube is metal-oxide-semiconductor, described to open
The first end for closing pipe is the grid of metal-oxide-semiconductor, and the second end of the switching tube is the drain electrode of metal-oxide-semiconductor, the third end of the switching tube
For the source electrode of metal-oxide-semiconductor.
7. a kind of detection control circuit of electronic device, the electronic device includes flyback control chip, input rectifying protection electricity
The voltage input end on road, bleeder circuit, the flyback control chip is connected to the output end of bleeder circuit, the bleeder circuit
Input terminal is respectively connected to the firewire and zero curve of input rectifying protection circuit；It is characterized in that：
The voltage output end that the input terminal of the detection control circuit controls chip with flyback is connect, and it is whole that output end is connected to input
The firewire for flowing protection circuit controls the short circuit fault signal that the voltage output end of chip is sent out for detecting flyback, and is receiving
The firewire of input rectifying protection circuit is controlled after to short circuit fault signal makes its shorted to earth.
8. detection control circuit according to claim 7, which is characterized in that the detection control circuit include switching tube,
Resistance, capacitance, two diodes, wherein：
Resistance and capacitance are parallel between the voltage output end and ground of flyback control chip；
Switching tube includes three ends, and the voltage output end of the first end connection flyback control chip of switching tube, second end are connected to defeated
Enter the firewire of rectification protection circuit, third end ground connection；Two diodes are connected to the first end of switching tube and flyback controls chip
Voltage output end between, and the anode of two diodes is connected with each other.
9. detection control circuit according to claim 8, which is characterized in that the voltage output end of the flyback control chip
The diode of connection is zener diode.
10. detection control circuit according to claim 8, which is characterized in that the switching tube is metal-oxide-semiconductor, the switch
The first end of pipe is the grid of metal-oxide-semiconductor, and the second end of the switching tube is the drain electrode of metal-oxide-semiconductor, and the third end of the switching tube is
The source electrode of metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721749574.4U CN208062779U (en) | 2017-12-13 | 2017-12-13 | Short-circuit fault protection circuit and detection control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721749574.4U CN208062779U (en) | 2017-12-13 | 2017-12-13 | Short-circuit fault protection circuit and detection control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN208062779U true CN208062779U (en) | 2018-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721749574.4U Active CN208062779U (en) | 2017-12-13 | 2017-12-13 | Short-circuit fault protection circuit and detection control circuit |
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| Country | Link |
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| CN (1) | CN208062779U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111806281A (en) * | 2020-07-23 | 2020-10-23 | 张家港友诚新能源科技股份有限公司 | An AC transfer circuit with self-test function |
| CN112821780A (en) * | 2021-02-07 | 2021-05-18 | 浙江中新电力工程建设有限公司 | Auxiliary power supply rectifier circuit board for multifunctional circuit breaker and distribution structure thereof |
-
2017
- 2017-12-13 CN CN201721749574.4U patent/CN208062779U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111806281A (en) * | 2020-07-23 | 2020-10-23 | 张家港友诚新能源科技股份有限公司 | An AC transfer circuit with self-test function |
| CN112821780A (en) * | 2021-02-07 | 2021-05-18 | 浙江中新电力工程建设有限公司 | Auxiliary power supply rectifier circuit board for multifunctional circuit breaker and distribution structure thereof |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190604 Address after: 510663 No. 192 Kezhu Road, Guangzhou Economic and Technological Development Zone, Guangdong Province Patentee after: GUANGZHOU SHIKUN ELECTRONICS Co.,Ltd. Address before: 510530 No. 6, Yun Po four road, Whampoa District, Guangzhou, Guangdong. Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited |
|
| TR01 | Transfer of patent right |