CN108988296A - A kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply - Google Patents
A kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply Download PDFInfo
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- CN108988296A CN108988296A CN201810810264.1A CN201810810264A CN108988296A CN 108988296 A CN108988296 A CN 108988296A CN 201810810264 A CN201810810264 A CN 201810810264A CN 108988296 A CN108988296 A CN 108988296A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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Abstract
The invention discloses a kind of overload hiccup protections circuits for half-bridge topology Switching Power Supply, including overload hiccup protections circuit and power circuit；The overload hiccup protections circuit includes driving circuit and control circuit, the driving circuit includes field-effect tube Q5, thyristor SCR2, diode D13, resistance R58, resistance R76, capacitor C18, hiccup interval delay control circuit, the capacitor C18 and resistance R76 are connected in parallel between the cathode and control electrode of thyristor SCR2, the control electrode of thyristor SCR2 is connect with the drain electrode of field-effect tube Q5, cathode is connect with the source electrode of field-effect tube Q5, the anode of thyristor SCR2 is connect with the cathode of diode D13, the anode of diode D13 is connected to the center-side of the transformer T coil of switching power circuit, the source electrode of field-effect tube Q5 is connect with the hiccup interval delay control circuit of control field-effect tube Q5 on-off.The advantages of invention is: for Switching Power Supply when overloading, Switching Power Supply enters interval protected mode, after overload phenomenon disappears, automatically restores to work normally.
Description
Technical field
The present invention relates to the technical fields of Switching Power Supply more particularly to a kind of overload for half-bridge topology Switching Power Supply to beat
Belch protection circuit.
Background technique
The half-bridge topology switching power circuit being made of FAN7500 (TL494) has more than 30 years history, has performance can
It leans on, interference is small, is still widely used in my company's Universal Switching Power Supply product so far.Since FAN7500 integrated circuit is set itself
Meter, this circuit output overcurrent protection mode are generally the mode that constant current current limliting adds output short-circuit shutdown, and the product of design is general
Needing to re-power after protection could restore normally to export.If necessary to after load restoration is normal, be designed as not powering off certainly
The dynamic working method for restoring normally to export generally is exactly to remove short-circuit breaking circuit, and the method, which can be brought when short circuit, still to be had very greatly
Output electric current, load circuit may be caused further damage and overheat risk.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, it is an object of the invention to solve in the prior art equipment after protection
The problem of re-powering is needed, for this purpose, the present invention provides a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply.
To achieve the above object, the invention adopts the following technical scheme:
A kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply includes overload hiccup protections circuit and power supply
Circuit；The overload hiccup protections circuit includes driving circuit, including driving circuit and control circuit, and control circuit includes benchmark
Potential circuit and the first output current amplification circuit being all connected with reference voltage circuit, the second output current amplification circuit, the
One comparison circuit, the second comparison circuit；
The power circuit includes rectifier bridge BD1, transformer T, resistance R1, capacitor C1, power supply chip IC2, diode
Two input terminals and the 220V exchange of D29, electrolytic capacitor C33, the rectifier bridge BD1 are electrically connected, two output ends respectively with change
The primary side of depressor T connects, and the cathode output end of transformer T is connect by resistance R1 with the input terminal of power supply chip IC2, by two
The anode of the connection of the input terminal of pole pipe D25 and reference voltage circuit, electrolytic capacitor is connect with the output end of diode D29, cathode
It is connected to ground；
The driving circuit includes field-effect tube Q5, thyristor SCR2, diode D13, resistance R58, resistance R76, capacitor
C18, hiccup interval delay control circuit, the capacitor C18 and resistance R76 are connected in cathode and the control of thyristor SCR2 in parallel
Between pole, the control electrode of thyristor SCR2 is connect with the drain electrode of field-effect tube Q5, and cathode is connect with the source electrode of field-effect tube Q5, brilliant
The anode of brake tube SCR2 is connect with the cathode of diode D13, and the anode of diode D13 is connected to the transformer of switching power circuit
The source electrode of the center-side of T coil, field-effect tube Q5 is connect with the hiccup interval delay control circuit of control field-effect tube Q5 on-off；
The reference voltage circuit exports current amplification circuit, first with the first output current amplification circuit, second respectively
Comparison circuit, the second comparison circuit connection, it is described first output current amplification circuit output end by the first delay circuit with
One input terminal of the first comparison circuit connects, and the output end of the second output current amplification circuit is by the second delay circuit and the
One input terminal of two comparison circuits connects, the output end connection of the output end of the first comparison circuit and the second comparison circuit.
Further, the reference voltage circuit includes resistance R62, three end adjustable voltage fiducial chip IC3, and described first
Output current amplification circuit, the second output current amplification circuit, the first comparison circuit, the second comparison circuit respectively include operation and put
Big device IC5B, operational amplifier IC5A, operational amplifier IC4A, operational amplifier IC4B, one end of the resistance R62 is as base
The input terminal of quasi- potential circuit, the other end are connect with the positive input terminal of the first comparison circuit and the second comparison circuit respectively, and
It is connect with the cathode of three end adjustable voltage fiducial chip IC3 and benchmark pole, the anode and ground of three end adjustable voltage fiducial chip IC3
Connection.
Further, it is described first output current amplification circuit include resistance R67, operational amplifier IC5B, resistance R39,
Resistance R56, resistance R59, resistance R63, resistance R67, potentiometer VR3, the cathode of three end adjustable voltage fiducial chip IC3 lead to respectively
Resistance R56 is crossed to connect and connect by resistance R59 with positive input terminal, operational amplifier with the negative input end of operational amplifier IC5B
The positive input terminal of IC5B is connected to ground by resistance R56, negative input end successively pass through resistance R63, potentiometer VR3, resistance R39 with
One end of current sampling resistor in Switching Power Supply connects.
Further, first delay circuit includes resistance R71 and electrolytic capacitor C34, one end of the resistance R71 with
The output end of operational amplifier IC5B connects, and the other end is positive and operational amplifier IC4A negative with electrolytic capacitor C34 respectively
Input terminal connects, one end connection of the current sampling resistor in the cathode and Switching Power Supply of electrolytic capacitor C34.
Further, it is described second output current amplification circuit include operational amplifier IC5A, resistance R50, resistance R55,
Resistance R57, resistance R73, resistance R74, potentiometer VR2, the cathode of three end adjustable voltage fiducial chip IC3 pass through resistance respectively
R74 connect with the negative input end of operational amplifier IC5A and is connect by resistance R73 with positive input terminal, operational amplifier IC5A's
Positive input terminal is connected to ground by resistance R73, and negative input end successively passes through resistance R50, potentiometer VR2, resistance R57 and switch electricity
One end of current sampling resistor in source connects.
Further, second delay circuit includes resistance R69 and electrolytic capacitor C42, one end of the resistance R69 with
The output end of operational amplifier IC5A connects, and the other end is positive and operational amplifier IC4B negative with electrolytic capacitor C42 respectively
Input terminal connects, one end connection of the current sampling resistor in the cathode and Switching Power Supply of electrolytic capacitor C42.
It further, further include the anode process of diode D25, resistance R60, electrolytic capacitor C41, the diode D25
The connection of the input terminal of resistance R60 and reference voltage circuit, and connect with the source electrode of the anode of electrolytic capacitor C41 and field-effect tube Q5
It connects, the cathode of electrolytic capacitor is connected to ground.
Further, the model K2962 of the field-effect tube Q5.
Further, the power supply chip IC2 is IM7812.
The present invention has the advantages that the invention enables half-bridge topology Switching Power Supplies when overloading, Switching Power Supply enters
Interval protection (hiccup mode) mode, after overload phenomenon disappears, automatically restores to work normally.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the overload hiccup protections circuit for half-bridge topology Switching Power Supply of the present invention.
Fig. 2 is the enlarged drawing of the part A in Fig. 1.
Specific embodiment
The present embodiment is with a 150W single channel output switch power source, it is desirable that output electric current is delayed 3-9 within the scope of 7-10A
Second hiccup entered hiccup state more than 10A within 0.5 second time.In order to achieve the above object, the technical solution adopted by the present invention
Are as follows: it installs overload hiccup protections circuit circuit additional in power circuit and is answered by 7-10A delay hiccup and greater than what 10A had the hiccups immediately
Electrical combination is closed to form.
As shown in Figs. 1-2, a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply, including driving circuit,
The driving circuit includes field-effect tube Q5, thyristor SCR2, diode D13, resistance R58, resistance R76, capacitor C18, hiccup
It is spaced delay control circuit, the capacitor C18 and resistance R76 are connected in parallel between the cathode and control electrode of thyristor SCR2,
The control electrode of thyristor SCR2 is connect with the drain electrode of field-effect tube Q5, and cathode is connect with the source electrode of field-effect tube Q5, thyristor
The anode of SCR2 is connect with the cathode of diode D13, and the anode of diode D13 is connected to the transformer T line of switching power circuit
The center-side of circle, the source electrode of field-effect tube Q5 and the hiccup interval delay control circuit of control field-effect tube Q5 on-off.Its midfield
The model K2962 of effect pipe Q5, thyristor SCR2 are the three pole thyristor of reverse blocking of model BT169D, resistance
R58 and resistance R76 resistance value are 10K Ω.
The control circuit includes the first output current amplification circuit, the first delay circuit, the second output Current amplifier electricity
Road, the second delay circuit, the first comparison circuit, the second comparison circuit, reference voltage circuit, the reference voltage circuit respectively with
First output current amplification circuit, the second output current amplification circuit, the first comparison circuit, the connection of the second comparison circuit, it is described
The output end of first output current amplification circuit is connect by the first delay circuit with an input terminal of the first comparison circuit, the
The output end of two output current amplification circuits is connect by the second delay circuit with an input terminal of the second comparison circuit, and first
The connection of the output end of the output end of comparison circuit and the second comparison circuit.
The reference voltage circuit includes resistance R62, three end adjustable voltage fiducial chip IC3, the first output electric current
Amplifying circuit, the second output current amplification circuit, the first comparison circuit, the second comparison circuit respectively include operational amplifier
IC5B, operational amplifier IC5A, operational amplifier IC4A, operational amplifier IC4B, operational amplifier IC5B and operational amplifier
IC5A is two operational amplifiers in chip IC 5, and operational amplifier IC4A and operational amplifier IC4B are two in chip IC 4
The model of a operational amplifier, chip IC 4 and chip IC 5 is LM358.One end of the resistance R62 is as reference voltage electricity
The input terminal on road, the other end are connect with the positive input terminal of the first comparison circuit and the second comparison circuit respectively, and can with three ends
The cathode of voltage reference chip IC3 is adjusted to connect with benchmark pole, the anode of three end adjustable voltage fiducial chip IC3 is connected to ground.Its
The resistance value of middle resistance R62 is 3.3K Ω, the model AZ431 of three end adjustable voltage fiducial chip IC3.
The first output current amplification circuit includes resistance R67, operational amplifier IC5B, resistance R39, resistance R56, electricity
R59, resistance R63, resistance R67, potentiometer VR3 are hindered, the cathode of three end adjustable voltage fiducial chip IC3 passes through resistance R56 respectively
It connect with the negative input end of operational amplifier IC5B and is connect by resistance R59 with positive input terminal, operational amplifier IC5B is just
Input terminal is connected to ground by resistance R56, and negative input end successively passes through resistance R63, potentiometer VR3, resistance R39 and Switching Power Supply
In current sampling resistor one end connection.The resistance value of resistance R67 is 2.4K Ω, and the resistance value of resistance R39 is 1K Ω, resistance R56
Resistance value be 15 Ω, the resistance value of resistance R59 is 8.2K Ω, and the resistance value of resistance R63 is 1K Ω, and the resistance value of resistance R67 is 2.4K Ω,
The maximum value of potentiometer VR3 is 10K Ω.
First delay circuit includes resistance R71 and electrolytic capacitor C34, one end of the resistance R71 and operation amplifier
The output end of device IC5B connects, and negative input end of the other end respectively with the anode of electrolytic capacitor C34 and operational amplifier IC4A connects
It connects, one end connection of the current sampling resistor in the cathode and Switching Power Supply of electrolytic capacitor C34.The resistance value of resistance R71 is 200K
Ω.The capacitance size of electrolytic capacitor C34 is 25V100UF.
The second output current amplification circuit includes operational amplifier IC5A, resistance R50, resistance R55, resistance R57, electricity
R73, resistance R74, potentiometer VR2 are hindered, the cathode of three end adjustable voltage fiducial chip IC3 passes through resistance R74 respectively and puts with operation
The negative input end of big device IC5A is connected and is connect by resistance R73 with positive input terminal, the positive input terminal warp of operational amplifier IC5A
It crosses resistance R73 to be connected to ground, negative input end successively passes through the electric current in resistance R50, potentiometer VR2, resistance R57 and Switching Power Supply
One end of sample resistance connects.The resistance value of resistance R50 is 1K Ω, and the resistance value of resistance R55 is 15 Ω, and the resistance value of resistance R57 is 1K
The resistance value of Ω, resistance R73 are 8.2K Ω, and the resistance value of resistance R74 is 2.4K Ω, and the maximum value of potentiometer VR2 is 10K Ω.
Second delay circuit includes resistance R69 and electrolytic capacitor C42, one end of the resistance R69 and operation amplifier
The output end of device IC5A connects, and negative input end of the other end respectively with the anode of electrolytic capacitor C42 and operational amplifier IC4B connects
It connects, one end connection of the current sampling resistor in the cathode and Switching Power Supply of electrolytic capacitor C42.The resistance value of resistance R69 is 10K
Ω.The capacitance size of electrolytic capacitor C42 is 25V47UF.
Switching Power Supply further includes the anode of diode D25, resistance R60, electrolytic capacitor C41, the diode D25 by electricity
The input terminal for hindering R60 and reference voltage circuit connects, and connect with the source electrode of the anode of electrolytic capacitor C41 and field-effect tube Q5,
The cathode of electrolytic capacitor is connected to ground.The resistance value of resistance R60 is 10K Ω, and the capacitance size of electrolytic capacitor is C4116V470UF.
Switching Power Supply further includes power circuit, including rectifier bridge BD1, transformer T, resistance R1, capacitor C1, power supply chip
Two input terminals and the 220V exchange of IC2, diode D29, electrolytic capacitor C33, the rectifier bridge BD1 be electrically connecteds, and two export
End is connect with the primary side of transformer T respectively, and the cathode output end of transformer T passes through the input terminal of resistance R1 and power supply chip IC2
Connection is connected by the input terminal of diode D25 and reference voltage circuit, the output of the anode and diode D29 of electrolytic capacitor
End connection, cathode are connected to ground.
The above is only the preferred embodiments of the invention, are not intended to limit the invention creation, all in the present invention
Made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the invention within the spirit and principle of creation
Within the scope of shield.
Claims (9)
1. a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply, which is characterized in that including overloading hiccup protections
Circuit and power circuit；The overload hiccup protections circuit includes driving circuit, including driving circuit and control circuit, control electricity
Road includes that reference voltage circuit and the first output current amplification circuit being all connected with reference voltage circuit, the second output electric current are put
Big circuit, the first comparison circuit, the second comparison circuit；The power circuit includes rectifier bridge BD1, transformer T, resistance R1, electricity
Hold two input terminals and 220V alternating current of C1, power supply chip IC2, diode D29, electrolytic capacitor C33, the rectifier bridge BD1
Connection, two output ends are connect with the primary side of transformer T respectively, and the cathode output end of transformer T is by resistance R1 and power supply core
The input terminal of piece IC2 connects, and connects by the input terminal of diode D25 and reference voltage circuit, the anode and two of electrolytic capacitor
The output end of pole pipe D29 connects, and cathode is connected to ground；
The driving circuit include field-effect tube Q5, thyristor SCR2, diode D13, resistance R58, resistance R76, capacitor C18,
Hiccup interval delay control circuit, the capacitor C18 and resistance R76 be connected in parallel thyristor SCR2 cathode and control electrode it
Between, the control electrode of thyristor SCR2 is connect with the drain electrode of field-effect tube Q5, and cathode is connect with the source electrode of field-effect tube Q5, thyristor
The anode of SCR2 is connect with the cathode of diode D13, and the anode of diode D13 is connected to the transformer T line of switching power circuit
The source electrode of the center-side of circle, field-effect tube Q5 is connect with the hiccup interval delay control circuit of control field-effect tube Q5 on-off；
Compared with the reference voltage circuit exports current amplification circuit, the second output current amplification circuit, first with first respectively
The output end of circuit, the connection of the second comparison circuit, the first output current amplification circuit passes through the first delay circuit and first
One input terminal of comparison circuit connects, and the output end of the second output current amplification circuit is by the second delay circuit and the second ratio
An input terminal compared with circuit connects, the output end connection of the output end of the first comparison circuit and the second comparison circuit.
2. a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply according to claim 1, feature exist
In the reference voltage circuit includes resistance R62, three end adjustable voltage fiducial chip IC3, the first output Current amplifier electricity
Road, the second output current amplification circuit, the first comparison circuit, the second comparison circuit respectively include operational amplifier IC5B, operation
Amplifier IC5A, operational amplifier IC4A, operational amplifier IC4B, one end of the resistance R62 is as reference voltage circuit
Input terminal, the other end are connect with the positive input terminal of the first comparison circuit and the second comparison circuit respectively, and with three end adjustable electrics
The cathode of pressure fiducial chip IC3 is connected with benchmark pole, and the anode of three end adjustable voltage fiducial chip IC3 is connected to ground.
3. a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply according to claim 2, feature exist
In the first output current amplification circuit includes resistance R67, operational amplifier IC5B, resistance R39, resistance R56, resistance
R59, resistance R63, resistance R67, potentiometer VR3, the cathode of three end adjustable voltage fiducial chip IC3 pass through respectively resistance R56 with
The negative input end of operational amplifier IC5B is connected and is connect by resistance R59 with positive input terminal, and operational amplifier IC5B's is just defeated
Enter end to be connected to ground by resistance R56, negative input end successively passes through in resistance R63, potentiometer VR3, resistance R39 and Switching Power Supply
Current sampling resistor one end connection.
4. a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply according to claim 3, feature exist
In first delay circuit includes one end and the operational amplifier IC5B of resistance R71 and electrolytic capacitor C34, the resistance R71
Output end connection, the other end connect with the anode and the negative input end of operational amplifier IC4A of electrolytic capacitor C34 respectively, electrolysis
One end of current sampling resistor in the cathode and Switching Power Supply of capacitor C34 connects.
5. a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply according to claim 4, feature exist
In the second output current amplification circuit includes operational amplifier IC5A, resistance R50, resistance R55, resistance R57, resistance
R73, resistance R74, potentiometer VR2, the cathode of three end adjustable voltage fiducial chip IC3 pass through resistance R74 and operation amplifier respectively
The negative input end of device IC5A is connected and is connect by resistance R73 with positive input terminal, and the positive input terminal of operational amplifier IC5A passes through
Resistance R73 is connected to ground, and negative input end successively passes through resistance R50, potentiometer VR2, resistance R57 and the electric current in Switching Power Supply and takes
One end of sample resistance connects.
6. a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply according to claim 5, feature exist
In second delay circuit includes one end and the operational amplifier IC5A of resistance R69 and electrolytic capacitor C42, the resistance R69
Output end connection, the other end connect with the anode and the negative input end of operational amplifier IC4B of electrolytic capacitor C42 respectively, electrolysis
One end of current sampling resistor in the cathode and Switching Power Supply of capacitor C42 connects.
7. a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply according to claim 2, feature exist
In, further include diode D25, resistance R60, electrolytic capacitor C41, the diode D25 anode by resistance R60 and benchmark electricity
The input terminal of volt circuit connects, and connect with the source electrode of the anode of electrolytic capacitor C41 and field-effect tube Q5, the cathode of electrolytic capacitor
It is connected to ground.
8. a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply according to claim 7, feature exist
In the model K2962 of the field-effect tube Q5.
9. a kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply according to claim 1, feature exist
In the power supply chip IC2 is IM7812.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810264.1A CN108988296A (en) | 2018-07-23 | 2018-07-23 | A kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810264.1A CN108988296A (en) | 2018-07-23 | 2018-07-23 | A kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply |
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| Publication Number | Publication Date |
|---|---|
| CN108988296A true CN108988296A (en) | 2018-12-11 |
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ID=64550179
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810810264.1A Pending CN108988296A (en) | 2018-07-23 | 2018-07-23 | A kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012163248A1 (en) * | 2011-05-31 | 2012-12-06 | 杭州士兰微电子股份有限公司 | Switching power supply control device and flyback switching power supply comprising same |
| CN102969883A (en) * | 2012-12-07 | 2013-03-13 | 深圳市核达中远通电源技术有限公司 | Switching power supply burp protection and delay protection circuit |
| CN207039172U (en) * | 2017-07-02 | 2018-02-23 | 中国航空工业集团公司雷华电子技术研究所 | A kind of Switching Power Supply hiccup protections circuit |
| CN207490494U (en) * | 2017-10-11 | 2018-06-12 | 安徽衡孚电子科技有限公司 | A kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply |
-
2018
- 2018-07-23 CN CN201810810264.1A patent/CN108988296A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012163248A1 (en) * | 2011-05-31 | 2012-12-06 | 杭州士兰微电子股份有限公司 | Switching power supply control device and flyback switching power supply comprising same |
| CN102969883A (en) * | 2012-12-07 | 2013-03-13 | 深圳市核达中远通电源技术有限公司 | Switching power supply burp protection and delay protection circuit |
| CN207039172U (en) * | 2017-07-02 | 2018-02-23 | 中国航空工业集团公司雷华电子技术研究所 | A kind of Switching Power Supply hiccup protections circuit |
| CN207490494U (en) * | 2017-10-11 | 2018-06-12 | 安徽衡孚电子科技有限公司 | A kind of overload hiccup protections circuit for half-bridge topology Switching Power Supply |
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Application publication date: 20181211 |
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