CN107493009A - Multi-functional expansion protection circuit - Google Patents
Multi-functional expansion protection circuit Download PDFInfo
- Publication number
- CN107493009A CN107493009A CN201710744721.7A CN201710744721A CN107493009A CN 107493009 A CN107493009 A CN 107493009A CN 201710744721 A CN201710744721 A CN 201710744721A CN 107493009 A CN107493009 A CN 107493009A
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- Prior art keywords
- resistance
- electric capacity
- voltage
- low
- triode
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of multi-functional expansion protection circuit, including low-voltage protection circuit, low-voltage testing circuit and bleeder circuit；The low-voltage protection circuit, low-voltage testing circuit and bleeder circuit are sequentially connected electrically；The low-voltage protection circuit includes resistance RS54, voltage-regulator diode ZS51, electric capacity CS52, electric capacity CS53, resistance RS56, resistance RS55A, resistance RS57 and triode QS52.The present invention has the advantages that：The present invention can expand multiple functions, including the function such as the minimum-depth of light modulation angle, input low-voltage variation, output over-voltage protection；Chip can be protected by low-voltage testing circuit and low-voltage protection circuit, improve electronic power device security, extend electronic power service life of equipment.
Description
Technical field
The present invention relates to electronic power equipment protection technical field, and multiple functions can be expanded more particularly, to one kind, can
To improve electronic power device security, the multi-functional expansion protection circuit of electronic power service life of equipment can be extended.
Background technology
As country widelys popularize to energy-conserving product, the electronic power equipment such as power supply, driver is more next in the market demand
It is bigger, while country proposes higher requirement to the attitude of security incident zero tolerance to the security of electronic power equipment.
With the popularization in LED illumination market, various chip factory commercial cities release countless control chips for illumination market.But
In many amateur IC suppliers, chip price is often made low, welcome by many power supplys, drive manufacturers.But
Including not accounted for by the function of amateur IC suppliers, many securities, these products are caused to exist from some applications
Larger potential safety hazard.Wherein input low pressure has certain security risk without protecting.If at this moment there is no defencive function, make
Power output declines, then for the fuse in prime major loop in power circuit, differential mode, common mode inductance and commutation diode
Loss increase by more than 4 times, cause these long term devices to be in high loss febrile state, co-mode coil high temperature can be caused when serious
It is rubescent, skeleton is heated, and PCB is burnt and is carbonized, cause shell to heat.If these elements are non-flame-retardant material, may make
Into the severe safety accident such as fire.
The content of the invention
The present invention in order to overcome in the prior art electronic power equipment safety performance it is low, brownout causes component to damage
It is bad, cause the deficiency that service life is short, it is proposed that one kind can expand multiple functions, can improve electronic power equipment safety
Property, the multi-functional expansion protection circuit of electronic power service life of equipment can be extended.
To achieve these goals, present invention employs following technical scheme：
A kind of multi-functional expansion protection circuit, including low-voltage protection circuit, low-voltage testing circuit and bleeder circuit；The low pressure is protected
Protection circuit, low-voltage testing circuit and bleeder circuit are sequentially connected electrically；The low-voltage protection circuit includes resistance RS54, the pole of voltage stabilizing two
Pipe ZS51, electric capacity CS52, electric capacity CS53, resistance RS56, resistance RS55A, resistance RS57 and triode QS52；The one of resistance RS54
One end of the negative pole with voltage-regulator diode ZS51, electric capacity CS52, electric capacity CS53, resistance RS56 and resistance RS55A respectively is held to be electrically connected
Connect, the electric capacity CS52 other end and voltage-regulator diode ZS51 positive pole are grounded, resistance the RS55A other end and triode QS52
Emitter stage electrical connection, triode QS52 colelctor electrode electrically connects with resistance RS57 one end, triode QS52 base stage, electric capacity
CS53 and resistance the RS56 other end electrically connect with low-voltage testing circuit.
The present invention detects input voltage by low-voltage testing circuit, if input voltage is less than the voltage set, three poles
Pipe QS51 is turned on, and allows electric capacity CS53 to charge, and forms electric capacity both ends pressure difference, so as to which trigger triode QS52 is turned on, is produced certain
Voltage is applied to control chip protection pin or reduced on power control pin, so as to realize low-voltage variation.
Preferably, low-voltage testing circuit include commutation diode DS51, electric capacity CS51, resistance RS52A, resistance RS52B,
Triode QS51 and resistance RS53；Commutation diode DS51 positive pole electrically connects with bleeder circuit, and commutation diode DS51's is negative
The one end of pole respectively with electric capacity CS51, resistance RS52A and resistance RS52B electrically connects, resistance the RS52B other end and triode
QS51 base stage electrical connection, triode QS51 emitter stage electrically connect with resistance RS53 one end, the resistance RS53 other end point
The other end of base stage, electric capacity CS53 and resistance RS56 not with triode QS52 electrically connects, resistance the RS52A other end, electric capacity
The CS51 other end and triode QS51 colelctor electrode electrically connect with bleeder circuit.
Preferably, bleeder circuit includes resistance RS51A, resistance RS51B, resistance RS51C and resistance RS51D；Resistance
RS51A, resistance RS51B, resistance RS51C and resistance RS51D are sequentially connected electrically, commutation diode DS51 positive pole respectively with resistance
RS51C and resistance RS51D one end electrically connect, the resistance RS51D other end, the resistance RS52A other end, electric capacity CS51 it is another
One end and triode QS51 colelctor electrode are grounded.
Preferably, low-voltage protection circuit also includes resistance RS55B and electric capacity CS54, resistance RS55B one end respectively with
The emitter stage electrical connection of electric capacity CS54 one end, the resistance RS55A other end and triode QS52, the resistance RS55B other end
It is grounded with the electric capacity CS54 other end.
Preferably, also including control chip, control chip electrically connects with the resistance RS57 other end.
Preferably, also include pcb board, all resistance, all electric capacity, all diodes, all control chips and all
Triode is respectively positioned in PCB.
Therefore, the present invention has the advantages that：（1）The present invention can expand multiple functions, including dim angle
The functions such as minimum-depth, input low-voltage variation, output over-voltage protection；（2）Can by low-voltage testing circuit and low-voltage protection circuit
To be protected to chip, electronic power device security is improved, extends electronic power service life of equipment.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of the present invention；
Fig. 2 is a kind of left part of circuit diagram of embodiments of the invention；
Fig. 3 is a kind of right part of circuit diagram of embodiments of the invention.
In figure：Low-voltage protection circuit 1, low-voltage testing circuit 2, bleeder circuit 3.
Embodiment
The present invention is described further with embodiment below in conjunction with the accompanying drawings：
A kind of multi-functional expansion protection circuit as shown in Figure 1, including low-voltage protection circuit 1, low-voltage testing circuit 2 and partial pressure electricity
Road 3；The low-voltage protection circuit, low-voltage testing circuit and bleeder circuit are sequentially connected electrically；The low-voltage protection circuit includes electricity
Hinder RS54, voltage-regulator diode ZS51, electric capacity CS52, electric capacity CS53, resistance RS56, resistance RS55A, resistance RS57 and triode
QS52；Resistance RS54 one end negative pole with voltage-regulator diode ZS51, electric capacity CS52, electric capacity CS53, resistance RS56 and electricity respectively
RS55A one end electrical connection is hindered, the electric capacity CS52 other end and voltage-regulator diode ZS51 positive pole are grounded, resistance RS55A's
The other end electrically connects with triode QS52 emitter stage, and triode QS52 colelctor electrode electrically connects with resistance RS57 one end, and three
The other end of pole pipe QS52 base stage, electric capacity CS53 and resistance RS56 electrically connects with low-voltage testing circuit；Low-voltage protection circuit
Also include resistance RS55B and electric capacity CS54, resistance RS55B one end respectively one end with electric capacity CS54, resistance RS55A it is another
End and triode QS52 emitter stage are electrically connected, and the resistance RS55B other end and the electric capacity CS54 other end are grounded.
Wherein, low-voltage testing circuit includes commutation diode DS51, electric capacity CS51, resistance RS52A, resistance RS52B, three poles
Pipe QS51 and resistance RS53；Commutation diode DS51 positive pole electrically connects with bleeder circuit, commutation diode DS51 negative pole point
One end not with electric capacity CS51, resistance RS52A and resistance RS52B electrically connects, and the resistance RS52B other end is with triode QS51's
Base stage electrically connects, and triode QS51 emitter stage electrically connects with resistance RS53 one end, and the resistance RS53 other end is respectively with three
The other end electrical connection of pole pipe QS52 base stage, electric capacity CS53 and resistance RS56, the resistance RS52A other end, electric capacity CS51
The other end and triode QS51 colelctor electrode electrically connect with bleeder circuit.
Wherein, bleeder circuit includes resistance RS51A, resistance RS51B, resistance RS51C and resistance RS51D；Resistance RS51A,
Resistance RS51B, resistance RS51C and resistance RS51D are sequentially connected electrically, commutation diode DS51 positive pole and resistance RS51C and electricity
Hinder RS51D one end electrical connection, the resistance RS51D other end, the resistance RS52A other end, the electric capacity CS51 other end and three
Pole pipe QS51 colelctor electrode is grounded.
The course of work of the present invention is as follows：
Embodiment as shown in Figure 1, Figure 2 and Figure 3, the circuit in Fig. 2 and Fig. 3 are electrically connected by FB ports with the circuit in Fig. 1.
After power supply is accessed, alternating voltage AC is through insuring resistance F11, piezo-resistance VD21, differential mode inductance L11 and electric capacity C11 again through complete
Bridge rectification DS11, DS12, DS13 and DS14 form positive half cycle pulsating wave, then through differential mode inductance L21, supplying resistance RS61A,
RS61B and RS61C powers to VCC.When VCC voltages, which reach control chip, starts voltage, control chip drives three by RS31
Pole pipe Q31 ON-OFF alternations, it is primary inductance L41A energy storage, and electric energy is discharged by secondary inductance L41C and exported.
High-frequency ac voltage charges after diode D43 rectifications to electrochemical capacitor C43, because electrochemical capacitor capacity is very big, is formed stable
DC voltage, powering load, complete alternating voltage AC to DC voltage DC conversion.
The rectified bridge rectifications of AC power AC are positive pulsating semi-wave, through VDC points by divider resistance RS51A, resistance
RS51B, resistance RS51C and the detection of resistance RS51D partial pressures, then charged by rectifying tube DS51 to electric capacity CS51, and by resistance RS52A
Discharged with triode QS51.Resistance RS51 and electric capacity CS51 charge constant are shorter, in voltage-regulator diode ZS51
Datum mark formed before about 200ms complete charging process, to prevent delay from causing to judge by accident.Another way is electric by the power supply of control chip
The output of VCC ends is pressed, is charged by current-limiting resistance RS54 to electric capacity CS52, voltage-regulator diode ZS51 stable voltage is as charging
The judgment standard of voltage.Because triode QS51 is in cut-off state, resistance RS53 no currents pass through electric capacity CS53 and resistance
RS56 and triode QS52 is in voltage-regulator diode ZS51 datum marks, so circuit is in " floating ground " state, does not work.
When input voltage 100-240V is normal, the minimum about 7.5V of voltage at electric capacity CS51 and resistance RS52A both ends, specific capacitance
CS52 and voltage-regulator diode ZS51 reference voltages 5.6V are higher by about 2V or so, triode QS51 and triode QS52 all in back-pressure
Closed mode, current-limiting resistance RS57 no currents pass through.
When input voltage is less than action potential 80V, RS51D points of resistance RS51A, resistance RS51B, resistance RS51C and resistance
Charged after pressure through diode DS51 to electric capacity CS51, charging voltage is 5V or so, and electric capacity CS52 and the pole of voltage stabilizing two are supplied less than VCC
Pipe ZS51 reference voltage 5.6V, now triode QS51 have turn-on condition, it is in the conduction state, by resistance RS53 by electric capacity
CS53 lower end is directly pulled low to 5V or so, causes electric capacity CS53 both ends that about 0.6V pressure differences are presented, and triode QS52 has conducting bar
Part, in the conduction state, electric current provides triggering level through resistance RS57 to chip controls pin FB, promotes chip to be in protection work
State, the work of " hiccup " pattern, power output are reduced within 3W.
It should be understood that the present embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it is to be understood that
After having read the content of the invention lectured, those skilled in the art can make various changes or modifications to the present invention, these etc.
Valency form equally falls within the application appended claims limited range.
Claims (6)
1. a kind of multi-functional expansion protection circuit, it is characterised in that including low-voltage protection circuit（1）, low-voltage testing circuit（2）With
Bleeder circuit（3）；The low-voltage protection circuit, low-voltage testing circuit and bleeder circuit are sequentially connected electrically；The low-voltage variation electricity
Road include resistance RS54, voltage-regulator diode ZS51, electric capacity CS52, electric capacity CS53, resistance RS56, resistance RS55A, resistance RS57 and
Triode QS52；Resistance RS54 one end negative pole with voltage-regulator diode ZS51, electric capacity CS52, electric capacity CS53, resistance respectively
RS56 and resistance RS55A one end are electrically connected, and the electric capacity CS52 other end and voltage-regulator diode ZS51 positive pole are grounded, resistance
The RS55A other end electrically connects with triode QS52 emitter stage, triode QS52 colelctor electrode and resistance RS57 one end electricity
Connection, the other end of triode QS52 base stage, electric capacity CS53 and resistance RS56 electrically connect with low-voltage testing circuit.
2. multi-functional expansion protection circuit according to claim 1, it is characterised in that the low-voltage testing circuit includes whole
Flow diode DS51, electric capacity CS51, resistance RS52A, resistance RS52B, triode QS51 and resistance RS53；Commutation diode DS51
Positive pole electrically connected with bleeder circuit, commutation diode DS51 negative pole respectively with electric capacity CS51, resistance RS52A and resistance
RS52B one end electrical connection, the resistance RS52B other end electrically connect with triode QS51 base stage, triode QS51 transmitting
Pole electrically connects with resistance RS53 one end, the resistance RS53 other end base stage with triode QS52, electric capacity CS53 and electricity respectively
RS56 other end electrical connection is hindered, the colelctor electrode of the resistance RS52A other end, the electric capacity CS51 other end and triode QS51 is equal
Electrically connected with bleeder circuit.
3. multi-functional expansion protection circuit according to claim 2, it is characterised in that bleeder circuit include resistance RS51A,
Resistance RS51B, resistance RS51C and resistance RS51D；Resistance RS51A, resistance RS51B, resistance RS51C and resistance RS51D are electric successively
Connection, the one end of commutation diode DS51 positive pole respectively with resistance RS51C and resistance RS51D electrically connect, and resistance RS51D's is another
One end, the resistance RS52A other end, the electric capacity CS51 other end and triode QS51 colelctor electrode are grounded.
4. multi-functional expansion protection circuit according to claim 1, it is characterised in that low-voltage protection circuit also includes resistance
RS55B and electric capacity CS54, resistance RS55B one end one end with electric capacity CS54, resistance the RS55A other end and triode respectively
QS52 emitter stage electrical connection, the resistance RS55B other end and the electric capacity CS54 other end are grounded.
5. multi-functional expansion protection circuit according to claim 1, it is characterised in that also including control chip, control core
Piece electrically connects with the resistance RS57 other end.
6. the multi-functional expansion protection circuit according to claim 1 or 2 or 3 or 4 or 5, it is characterised in that also including PCB
Plate, all resistance, all electric capacity, all diodes, all control chips and all triodes are respectively positioned in PCB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710744721.7A CN107493009B (en) | 2017-08-25 | 2017-08-25 | Multifunctional expansion protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710744721.7A CN107493009B (en) | 2017-08-25 | 2017-08-25 | Multifunctional expansion protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107493009A true CN107493009A (en) | 2017-12-19 |
| CN107493009B CN107493009B (en) | 2023-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710744721.7A Active CN107493009B (en) | 2017-08-25 | 2017-08-25 | Multifunctional expansion protection circuit |
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| Country | Link |
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| CN (1) | CN107493009B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201937238U (en) * | 2011-01-27 | 2011-08-17 | 新宝电机(东莞)有限公司 | Input undervoltage protection circuit |
| CN204349420U (en) * | 2014-12-31 | 2015-05-20 | 深圳创维－Rgb电子有限公司 | Power protecting circuit and electronic equipment |
| CN204464946U (en) * | 2015-04-13 | 2015-07-08 | 安徽康佳绿色照明技术有限公司 | A kind of auxiliary power supply under-voltage protecting circuit |
| CN105591540A (en) * | 2015-11-16 | 2016-05-18 | 浙江凯耀照明股份有限公司 | Auxiliary direct current low-voltage power supply circuit applicable to switch power supply |
| US20170163143A1 (en) * | 2015-07-27 | 2017-06-08 | Shenzehn China Star Optoelectronics Technology Co. Ltd. | Protection circuit |
| US20170229969A1 (en) * | 2015-11-30 | 2017-08-10 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | Constant voltage output circuit, flyback switching power supply and electronic device |
| CN207184318U (en) * | 2017-08-25 | 2018-04-03 | 浙江凯耀照明股份有限公司 | Multi-functional expansion protection circuit |
-
2017
- 2017-08-25 CN CN201710744721.7A patent/CN107493009B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201937238U (en) * | 2011-01-27 | 2011-08-17 | 新宝电机(东莞)有限公司 | Input undervoltage protection circuit |
| CN204349420U (en) * | 2014-12-31 | 2015-05-20 | 深圳创维－Rgb电子有限公司 | Power protecting circuit and electronic equipment |
| CN204464946U (en) * | 2015-04-13 | 2015-07-08 | 安徽康佳绿色照明技术有限公司 | A kind of auxiliary power supply under-voltage protecting circuit |
| US20170163143A1 (en) * | 2015-07-27 | 2017-06-08 | Shenzehn China Star Optoelectronics Technology Co. Ltd. | Protection circuit |
| CN105591540A (en) * | 2015-11-16 | 2016-05-18 | 浙江凯耀照明股份有限公司 | Auxiliary direct current low-voltage power supply circuit applicable to switch power supply |
| US20170229969A1 (en) * | 2015-11-30 | 2017-08-10 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | Constant voltage output circuit, flyback switching power supply and electronic device |
| CN207184318U (en) * | 2017-08-25 | 2018-04-03 | 浙江凯耀照明股份有限公司 | Multi-functional expansion protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107493009B (en) | 2023-08-25 |
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