CN103872890B - Switching power supply circuit with short-circuit protection function - Google Patents
Switching power supply circuit with short-circuit protection function Download PDFInfo
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Abstract
The invention discloses a switch power supply circuit with short-circuit protection function, comprising: the main power conversion circuit controls the electric energy conversion process of the resonance controller chip by accessing a control signal, performs power conversion on a voltage signal at the input end of the power supply and reduces an output voltage signal; the constant-current and constant-voltage control circuit is provided with a current loop and a voltage loop, monitors a voltage signal of an output voltage end of the switching power supply in real time, and controls the switching power supply circuit to work in a constant-current and constant-voltage mode when the switching power supply circuit is short-circuited; and the short-circuit protection circuit is used for sending an overvoltage protection signal to the main power conversion circuit when the switching power supply is short-circuited and detects that the switching power supply circuit enters a constant-current constant-voltage mode, controlling the working state of the resonant controller chip and reducing an output voltage signal. The switching power supply circuit provided by the invention has the advantages of low power consumption, temperature rise prevention, strong load capacity and wide application range.
Description
Technical field
A kind of the present invention relates to electronic technology field, more particularly to switching power circuit with short-circuit protection function.
Background technology
At present, Switching Power Supply has become the main flow power supply on market, with the maturing of Switching Power Supply, standardization with it is international
Change, the requirement to Switching Power Supply is more harsh in the world.And as the world is to the energy and the pay attention to day by day of environmental issue, switch electricity
The development in source with apply in energy saving, economize on resources and the aspect such as environmental protection is also imperative, for this purpose, famous both at home and abroad
Switching Power Supply manufacturer the problems such as energy-conservation, efficiency, power consumption, environmental protection on especially pay attention to, while volume, weight to Switching Power Supply,
Quality, safety, use environment, Centralized Monitoring, parallel-operation expansion etc. propose more requirements.
Currently, traditional Switching Power Supply does not consider to work as load equipment（External devices or external equipment）It is short-circuited
The power consumption and problem of temperature rise of Shi Zaocheng switching power circuits.In order to solve the problem in prior art, switching power circuit is entered
Row is improved, and for example, adopts self-locking manner to output short-circuit, i.e., once detection finds short circuit phenomenon, then close output voltage, so
Resulted in Switching Power Supply need to reset again start could normal work, while also reducing the load capacity of Switching Power Supply；This
Outward, also another kind of Switching Power Supply on output short-circuit using beat every（Self- recoverage）Mode tackling the generation of short-circuit conditions.
Although the technical scheme can serve the effect of short-circuit protection to a certain extent, which is without constant current constant voltage mode of operation control
The Switching Power Supply of system thus be difficult to the application of parallel-operation expansion and limit switch power supply.And pure constant current constant voltage type switch electricity
Have the disadvantage during the output short-circuit of source, Switching Power Supply（About 1000 watts）The general loss for having tens watts, so as to cause the waste of the energy,
And will also result in the temperature rise of power supply and exceed the requirement of safety standard, there is serious potential safety hazard, while can not expire
Podomere energy, environmental requirement.
The content of the invention
The technical problem to be solved is to provide a kind of switching power circuit with short-circuit protection function, energy
It is enough to be reduced or switched off output voltage signal, protection switch power circuit energy saving consumption when being short-circuited, and realize electricity
The parallel function in source.
For solving above technical problem, the present invention provides a kind of switching power circuit with short-circuit protection function, including：
Main power conversion circuit, by incoming control signal, controls to the electric energy transfer process of resonant controller chip
System, carries out power conversion to the voltage signal of power input, reduces output voltage signal, with the protection switch when being short-circuited
Power circuit；
Constant-current and constant-voltage control circuit, is provided with current loop and voltage loop, the output voltage of real-time monitoring Switching Power Supply
The voltage signal at end, and control the switching power circuit when switching power circuit is short-circuited and be operated in constant current constant voltage mould
Formula；
And, short-circuit protection circuit, being short-circuited and detect the switching power circuit in Switching Power Supply enters constant current
During constant voltage mode, overvoltage protection signal is sent to the main power conversion circuit, control the work of the resonant controller chip
State, reduces output voltage signal.
In a kind of achievable mode, the short-circuit protection circuit includes the first operational amplifier, overvoltage protection signal end
With Switching Power Supply secondary feeder ear, and, by the first diode, the second diode, first resistor, second resistance, 3rd resistor,
4th resistance, the 5th resistance, the 6th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and protection optocoupler transmitting
The peripheral circuit of device composition；
Wherein, the protection optocoupler transmitter is sequentially connected in series with the first resistor, the first diode, and the protection light
The minus earth of coupling transmitter, anode are connected with the either end of the first resistor；First diode is common cathode double two
Pole pipe, an and anode of first diode is connected with the overvoltage protection signal end, first diode it is another
Individual anode is connected with the anode of second diode；
One end ground connection of first electric capacity, the other end are connected with the anode of second diode；Two or two pole
It is connected on the normal phase input end of first operational amplifier after the negative electrode series connection second resistance of pipe；First computing
The positive power source terminal of amplifier is the Switching Power Supply secondary feeder ear；The negative power end ground connection of first operational amplifier；Institute
One end ground connection of the second electric capacity is stated, the other end is connected to the Switching Power Supply secondary feeder ear；One termination of the 3rd electric capacity
Ground, the other end are connected to the normal phase input end of first operational amplifier；
One end of the 3rd resistor is connected to the inverting input of first operational amplifier, electricity on the basis of the other end
Pressure side；One end of 4th resistance is connected with the inverting input of first operational amplifier, other end ground connection；First fortune
The output end for calculating amplifier is connected with the anode of the second diode；
One end ground connection of the 5th resistance, the other end are connected with the normal phase input end of first operational amplifier；Institute
The one end for stating the 6th resistance is connected with the normal phase input end of first operational amplifier, and the other end is Current amplifier sampling end；
One end ground connection of the 4th electric capacity, the other end are connected on the inverting input of first operational amplifier.
Preferably, resistance of the short-circuit protection circuit by the regulation second resistance, controlling switch power circuit are entered
Enter self-locking state or self- recoverage state.
Further, the short-circuit protection circuit also includes the second operational amplifier, output voltage test side, mode of operation
Control end, and, by the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the tenth
The peripheral circuit of three resistance, the 3rd diode, the 5th electric capacity and first crystal triode composition；
Wherein, one end of the 7th resistance is connected with the Current amplifier sampling end, and the other end is connected to described second
In the output end of operational amplifier；5th resistance, the 6th resistance, the 7th resistance are constituted with the 3rd electric capacity
Delay circuit；
The negative electrode of the 3rd diode is connected in the output end of second operational amplifier, anode and the described 8th
One end connection of resistance；
It is connected on the reference voltage terminal after 8th resistance and the 9th resistant series；Second computing is put
The normal phase input end of big device is connected on the series connection point of the 8th resistance and the 9th resistance；One end connection of the tenth resistance
In the inverting input of second operational amplifier, the other end is the output voltage test side；
The emitter stage of the first crystal triode is connected with the Current amplifier sampling end, grounded collector, and base stage connects
It is connected on the series connection point of the 11st resistance and the 12nd resistance；A termination after 11st resistance and the 12nd resistant series
Ground, the other end are the mode of operation control end；One end ground connection after 13rd resistance is in parallel with the 5th electric capacity, the other end
It is connected with the normal phase input end of second operational amplifier.
A kind of switching power circuit with short-circuit protection function that the present invention is provided, has the advantages that：Pass through
Main power conversion circuit is set, the electric energy transfer process of resonant controller chip therein is controlled by incoming control signal
System, carries out power conversion to the voltage signal of power input, reduces output voltage signal, with the protection switch when being short-circuited
Power circuit；Constant current constant voltage pattern is operated in by arranging the constant-current and constant-voltage control circuit control switching power circuit, is improved
The load capacity of switching power circuit；By arranging short-circuit protection circuit to drive main power conversion circuit when being short-circuited,
Reduce output voltage signal, protection switch power circuit simultaneously realizes the parallel function of switching power circuit.Therefore, the present invention is provided
Switching power circuit on the basis of short-circuit protection is realized, while solving power consumption that output short-circuit brings and temperature rise is asked
Topic, the load capacity for enhancing switching power circuit and the scope of application for having widened switching power circuit.
Description of the drawings
Fig. 1 is the structural representation of the first embodiment of the switching power circuit with short-circuit protection function that the present invention is provided
Figure.
Fig. 2 is a kind of physical circuit schematic diagram of the short-circuit protection circuit that first embodiment of the invention is provided.
Fig. 3 is another physical circuit schematic diagram that the present invention provides the short-circuit protection circuit that second embodiment is provided.
Fig. 4 is a kind of circuit theory diagrams of the constant-current and constant-voltage control circuit that second embodiment of the invention is provided.
Fig. 5 is a kind of complete circuit schematic diagram of the switching power circuit that second embodiment of the invention is provided.
Fig. 6 is the partial circuit schematic diagram of the main power conversion circuit that second embodiment of the invention is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described.
Referring to Fig. 1, it is the knot of the first embodiment of the switching power circuit with short-circuit protection function that the present invention is provided
Structure schematic diagram.
Specifically, the described switching power circuit with short-circuit protection function, including：
Main power conversion circuit 100, by incoming control signal, is carried out to the electric energy transfer process of resonant controller chip
Control, carries out power conversion to the voltage signal of power input, reduces output voltage signal, opened with protecting when being short-circuited
Powered-down source circuit；
Constant-current and constant-voltage control circuit 200, is provided with current loop and voltage loop, the output electricity of real-time monitoring Switching Power Supply
The voltage signal of pressure side, and control the switching power circuit when switching power circuit is short-circuited and be operated in constant current constant voltage mould
Formula；
And, short-circuit protection circuit 300, being short-circuited and detect the switching power circuit in Switching Power Supply enters permanent
During stream constant voltage mode, overvoltage protection signal is sent to the main power conversion circuit 100, control the resonant controller chip
Working condition, reduces output voltage signal.
In the present embodiment, described short-circuit protection circuit 300 can be realized using various implementations.
Referring to Fig. 2, it is a kind of physical circuit schematic diagram of the short-circuit protection circuit that first embodiment of the invention is provided.
In a kind of achievable mode, the short-circuit protection circuit 300 includes the first operational amplifier U1, overvoltage protection letter
Number end OVP and Switching Power Supply secondary feeder ear VDD, and, by the first diode D1, the second diode D2, first resistor R1, the
Two resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the first electric capacity C1, the second electric capacity C2,
The peripheral circuit of three electric capacity C3, the 4th electric capacity C4 and protection optocoupler transmitter PC2A compositions.
Wherein, the protection optocoupler transmitter PC2A is sequentially connected in series with first resistor R1, the first diode D1, and institute
State the minus earth of protection optocoupler transmitter PC2A, anode to be connected with the either end of first resistor R1；One or two pole
Pipe D1 is common-cathode dual-diode, and an anode of the first diode D1 is connected with the overvoltage protection signal end OVP,
Another anode of the first diode D1 is connected with the anode of the second diode D2.
One end ground connection of the first electric capacity C1, the other end are connected with the anode of the second diode D2；Described second
It is connected on the in-phase input end of the first operational amplifier U1 after negative electrode series connection second resistance R2 of diode D2；Institute
The positive power source terminal for stating the first operational amplifier U1 is the Switching Power Supply secondary feeder ear VDD；The first operational amplifier U1
Negative power end ground connection；One end ground connection of the second electric capacity C2, the other end are connected to the Switching Power Supply secondary feeder ear
VDD；One end ground connection of the 3rd electric capacity C3, the other end are connected to the normal phase input end of the first operational amplifier U1.
One end of 3rd resistor R3 is connected to the inverting input of the first operational amplifier U1, and the other end is base
Quasi- voltage end REF；One end of 4th resistance R4 is connected with the inverting input of the first operational amplifier U1, another termination
Ground；The output end of the first operational amplifier U1 is connected with the anode of the second diode D2；When being embodied as, it is preferable that institute
State voltage on the basis of the voltage signal of reference voltage terminal REF access 5V.
One end ground connection of the 5th resistance R5, the other end are connected with the normal phase input end of the first operational amplifier U1
Connect；One end of the 6th resistance R6 is connected with the normal phase input end of the first operational amplifier U1, and the other end is put for electric current
Big sampling end IS；One end ground connection of the 4th electric capacity C4, the other end are connected to the anti-phase defeated of the first operational amplifier U1
Enter on end.
Further, when being embodied as, resistance of the short-circuit protection circuit 300 by regulation second resistance R2,
Controlling switch power circuit enters self-locking state or self- recoverage state.When the resistance of second resistance R2 is larger, short-circuit protection electricity
Road 300 launches into lock-out state when short circuit is detected；When the resistance of second resistance R2 is less, short-circuit protection circuit 300
Self- recoverage mode of operation, i.e. intermittent start is entered when being short-circuited（Hiccup）To obtain self-healing purpose.
In second embodiment of the invention, the basic composition of switching power circuit and circuit theory with first embodiment phase
Together.The present embodiment with the difference of first embodiment is：On the basis of first embodiment, short-circuit protection circuit is done further
Improvement, with the power consumption that solves to bring during switching power circuit output short-circuit and problem of temperature rise, and improve switching power circuit
Load capacity, and realize the simultaneously machine design of multiple switch power supply.
Referring to Fig. 3, it is another the physical circuit principle for the short-circuit protection circuit that the present invention provides second embodiment offer
Figure.
As shown in figure 3, on the basis of first embodiment, further, the short-circuit protection circuit 300 also includes second
Operational amplifier U2, output voltage test side V-CT, mode of operation control end MODE, and, by the 7th resistance R7, the 8th resistance
R8, the 9th resistance R9, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the three or two pole
The peripheral circuit of pipe D3, the 5th electric capacity C5 and first crystal triode Q1 compositions.
Wherein, one end of the 7th resistance R7 is connected with the Current amplifier sampling end IS, and the other end is connected to described
In the output end of the second operational amplifier U2；The 5th resistance R5, the 6th resistance R6, the 7th resistance R7 with it is described
3rd electric capacity C3 constitutes delay circuit.
The negative electrode of the 3rd diode D3 is connected in the output end of the second operational amplifier U2, anode with it is described
One end connection of the 8th resistance R8.
The 8th resistance R8 is connected on the reference voltage terminal REF after being connected with the 9th resistance R9；Described
The normal phase input end of two operational amplifier U2 is connected on the series connection point of the 8th resistance R8 and the 9th resistance R9；Described tenth
One end of resistance R10 is connected to the inverting input of the second operational amplifier U2, and the other end is detected for the output voltage
End V-CT.
The emitter stage of the first crystal triode Q1 is connected with the Current amplifier sampling end IS, grounded collector, base
Pole is connected on the series connection point of the 11st resistance R11 and the 12nd resistance R12；The 11st resistance R11 and the 12nd resistance
One end ground connection after R12 series connection, the other end is mode of operation control end MODE；The 13rd resistance R13 is electric with the 5th
One end ground connection after appearance C5 is in parallel, the other end are connected with the normal phase input end of the second operational amplifier U2.
When being embodied as, when switching power circuit is short-circuited, mode of operation control end MODE exports high level,
Control the first crystal triode Q1 and enter cut-off state, so as to controlling switch power circuit enters constant current mode.
Further, the constant-current and constant-voltage control circuit that the present embodiment is provided also includes current amplification circuit, and described
Current amplification circuit is sequentially connected with the current loop, the voltage loop.Preferably, the constant-current and constant-voltage control circuit is also
Including the overvoltage crowbar being connected with the voltage loop.
Referring to Fig. 4, it is a kind of circuit theory diagrams of the constant-current and constant-voltage control circuit that second embodiment of the invention is provided.
When being embodied as, constant-current and constant-voltage control circuit is provided with resistance R14～R40, diode D4～D9, electric capacity C6～C22,
Operational amplifier U3～U6, and the feedback optocoupler transmitter PC1A of current loop and voltage loop and former limit.Constant current constant voltage control
Circuit processed combines peripheral circuit, also plays a part of a kind of short-circuit protection, and over-pressed signal protection end OVP is connected with short-circuit protection circuit
Connecing, by controlling the resistance value of second resistance R2, controlling self-locking pattern to be operated in when its resistance value is larger, resistance value is compared with hourly worker
Make in self- recoverage pattern.
Referring to Fig. 5, it is a kind of complete circuit schematic diagram of the switching power circuit that second embodiment of the invention is provided.
The basic functional principle of the switching power circuit provided by the present embodiment is：When switching power circuit output occur it is short
Lu Shi, current sample end-IS locate the gathered amplified circuit of current sampling signal, current loop and enter constant current mode, then work
Operation mode control end MODE exports high level, causes first crystal triode Q1 to enter cut-off state；Now, when output voltage is examined
Survey the detected output voltages for obtaining of end V-CT and be less than the reference voltage accessed by the positive input of the second operational amplifier U2
When, cause the output signal of the second operational amplifier U2 to overturn, i.e., the output end of the second operational amplifier U2 is high level signal,
Jing after the delay circuit constituted by the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 3rd electric capacity C3 enters line delay, letter
Number being sent to the first operation amplifier comparator U1 is compared；Signal Jing after relatively is defeated from the first operational amplifier U1 output ends
Go out, then feed back to the control of former limit after the first diode D1, first resistor R1 and protection optocoupler transmitter PC2A are processed
Chip, i.e., in described resonant controller chip, so as to controlling switch power circuit cuts out output voltage signal, protection switch power supply
Circuit.
When being embodied as, according to above circuit operation principle, when switching power circuit enters guard mode, it is necessary to meet with
Lower three conditions：First, switching power circuit enters constant current mode, i.e. first crystal triode Q1 cut-offs；Second, output voltage
The voltage signal detected by test side V-CT is less than reference voltage（Reference voltage value can be designed as needed, it is preferable that adopt
With voltage on the basis of the voltage signal of 5V）；3rd, switching power circuit enters the time of constant current mode, more than delay circuit
Time delay.
Referring to Fig. 6, it is the partial circuit schematic diagram of the main power conversion circuit that second embodiment of the invention is provided.
Specifically, the main power conversion circuit 100 includes：Sent for accessing the protection optocoupler transmitter PC2A
Control signal, and control the protection optocoupler receiver that the resonant controller chip U7 closes output voltage when being short-circuited
PC2B.Therefore, the control signal for being sent from protection optocoupler transmitter PC2A can be by set by main power conversion circuit 100
Protection optocoupler receiver pc 2B is received, so as to reach the purpose of the output voltage values of controlling switch power circuit, according to opening
Whether powered-down source circuit is short-circuited and controls whether to close electric power output voltage.When being embodied as, the resonant controller core
Piece U7 is provided with postpones signal end DELAY, and is connected with the protection optocoupler receiver by the postpones signal end, accesses by institute
State the control signal sent by short-circuit protection circuit.
Therefore, the switching power circuit provided by second embodiment of the invention by circuit parameter, including current sample
Signal, output voltage, RC time constants progressively compare process, control resonant controller chip by protecting optocoupler transmitter
Postpones signal end DELAY input signal, so as to reach controlling switch power circuit when short circuit is detected enter self-locking mode
Formula or self- recoverage pattern, and reach the purpose of short-circuit protection.
This kind of circuit design can solve the power supply power consumption caused by short circuit and temperature rise in the purpose for reaching short-circuit protection
Problem, and overcome traditional switch power circuit realize a kind of short-circuit protection of pattern, load capacity difference and narrow application range
Defect.And as switching power circuit remains constant current constant voltage function, therefore can easily realize N+1 parallel-operation expansions；
And neatly different loads is powered according to the demand of client, therefore reduce to PCB（Printed circuit board (PCB)）Change plate
Number of times；As circuit design is more flexible, taking up room for design cost and pcb board is reduced, therefore greatly strengthen switch
The practicality of power circuit.
It should be noted that Fig. 6 only depicts the delay with protection optocoupler receiver pc 2B and resonant controller chip U7
Signal end DELAY（Pin 2）Connection and relative electronic components, and feedback light coupling receiver PC1B and its and resonant controller
The catenation principle figure of chip U7.When being embodied as, resonant controller chip U7 is necessarily also provided with peripheral circuit by other pins,
With the output voltage of controlling switch power circuit.Preferably, the resonant controller chip U7 can adopt model L6599ADTR
Chip realized.
Preferably, switching power circuit provided in an embodiment of the present invention can be applicable to PWM（Pulse Width
Modulation, pulsewidth modulation）In control chip.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (9)
1. a kind of switching power circuit with short-circuit protection function, it is characterised in that include：
Main power conversion circuit, by incoming control signal, is controlled to the electric energy transfer process of resonant controller chip, right
The voltage signal of power input carries out power conversion, reduces output voltage signal, with the protection switch power supply when being short-circuited
Circuit；
Constant-current and constant-voltage control circuit, is provided with current loop and voltage loop, the output voltage terminal of real-time monitoring Switching Power Supply
Voltage signal, and control the switching power circuit when switching power circuit is short-circuited and be operated in constant current constant voltage pattern；
And, short-circuit protection circuit, being short-circuited and detect the switching power circuit in Switching Power Supply enters constant current constant voltage
During pattern, overvoltage protection signal is sent to the main power conversion circuit, controls the working condition of the resonant controller chip,
Reduce output voltage signal；
The short-circuit protection circuit includes the first operational amplifier, overvoltage protection signal end and Switching Power Supply secondary feeder ear, with
And, by the first diode, the second diode, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th
The peripheral circuit of resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and protection optocoupler transmitter composition；
Wherein, the protection optocoupler transmitter is sequentially connected in series with the first resistor, the first diode, and the protection optocoupler is sent out
The minus earth of emitter, anode are connected with the either end of the first resistor；First diode is common-cathode dual-diode,
And an anode of first diode is connected with the overvoltage protection signal end, another anode of first diode
It is connected with the anode of second diode；
One end ground connection of first electric capacity, the other end are connected with the anode of second diode；Second diode
It is connected on the normal phase input end of first operational amplifier after the negative electrode series connection second resistance；First operation amplifier
The positive power source terminal of device is the Switching Power Supply secondary feeder ear；The negative power end ground connection of first operational amplifier；Described
One end ground connection of two electric capacity, the other end are connected to the Switching Power Supply secondary feeder ear；One end ground connection of the 3rd electric capacity, separately
One end is connected to the normal phase input end of first operational amplifier；
One end of the 3rd resistor is connected to the inverting input of first operational amplifier, voltage on the basis of the other end
End；One end of 4th resistance is connected with the inverting input of first operational amplifier, other end ground connection；First computing
The output end of amplifier is connected with the anode of the second diode；
One end ground connection of the 5th resistance, the other end are connected with the normal phase input end of first operational amplifier；Described
One end of six resistance is connected with the normal phase input end of first operational amplifier, and the other end is Current amplifier sampling end；It is described
One end ground connection of the 4th electric capacity, the other end are connected on the inverting input of first operational amplifier.
2. the switching power circuit of short-circuit protection function is carried as claimed in claim 1, it is characterised in that the short-circuit protection
Resistance of the circuit by the regulation second resistance, controlling switch power circuit enter self-locking state or self- recoverage state.
3. the switching power circuit of short-circuit protection function is carried as claimed in claim 1, it is characterised in that the short-circuit protection
Circuit also includes the second operational amplifier, output voltage test side, mode of operation control end, and, by the 7th resistance, the 8th electric
Resistance, the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 3rd diode, the 5th electric capacity and
The peripheral circuit of one transistor composition；
Wherein, one end of the 7th resistance is connected with the Current amplifier sampling end, and the other end is connected to second computing
In the output end of amplifier；5th resistance, the 6th resistance, the 7th resistance constitute time delay with the 3rd electric capacity
Circuit；
The negative electrode of the 3rd diode is connected in the output end of second operational amplifier, anode and the 8th resistance
One end connection；
It is connected on the reference voltage terminal after 8th resistance and the 9th resistant series；Second operational amplifier
Normal phase input end be connected on the series connection point of the 8th resistance and the 9th resistance；One end of tenth resistance is connected to institute
The inverting input of the second operational amplifier is stated, the other end is the output voltage test side；
The emitter stage of the first crystal triode is connected with the Current amplifier sampling end, and grounded collector, base stage are connected to
On the series connection point of the 11st resistance and the 12nd resistance；One end ground connection after 11st resistance and the 12nd resistant series,
The other end is the mode of operation control end；After 13rd resistance is in parallel with the 5th electric capacity one end ground connection, the other end with
The normal phase input end connection of second operational amplifier.
4. the switching power circuit of short-circuit protection function is carried as claimed in claim 3, it is characterised in that the main power becomes
Changing circuit includes：For accessing the control signal sent by the protection optocoupler transmitter, and control when being short-circuited described
Resonant controller chip closes the protection optocoupler receiver of output voltage.
5. the switching power circuit with short-circuit protection function as described in claim 3 or 4, it is characterised in that when switch electricity
When source circuit is short-circuited, the mode of operation control end exports high level, controls the first crystal triode and enters cut-off
State, so as to controlling switch power circuit enters constant current mode.
6. the switching power circuit of short-circuit protection function is carried as claimed in claim 5, it is characterised in that the resonance control
Device chip is provided with postpones signal end, and is connected with the protection optocoupler receiver by the postpones signal end, accesses by described
The control signal sent by short-circuit protection circuit.
7. the switching power circuit of short-circuit protection function is carried as claimed in claim 6, it is characterised in that the constant current constant voltage
Control circuit also includes current amplification circuit, and the current amplification circuit is with the current loop, the voltage loop successively
Connection.
8. the switching power circuit of short-circuit protection function is carried as claimed in claim 7, it is characterised in that the constant current constant voltage
Control circuit also includes the overvoltage crowbar being connected with the voltage loop.
9. the switching power circuit of short-circuit protection function is carried as claimed in claim 8, it is characterised in that the resonance control
Chip of the device chip for model L6599ADTR.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104779583B (en) * | 2015-04-30 | 2017-09-29 | 西安科技大学 | The design method of switch power supply die mould output short circuit protection circuit |
| FR3083397B1 (en) * | 2018-06-28 | 2020-08-21 | Valeo Equip Electr Moteur | SWITCH AND SWITCH ARM CONTROL SYSTEM |
| CN112994430B (en) * | 2021-02-26 | 2022-03-22 | 西安微电子技术研究所 | Multi-mode combined short-circuit protection circuit and working method and application thereof |
| CN117460122B (en) * | 2023-12-21 | 2024-04-30 | 厦门普为光电科技有限公司 | Lighting device with fault detection and self-locking control functions |
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