CN103872890A - Switching power supply circuit with short-circuit protection function - Google Patents
Switching power supply circuit with short-circuit protection function Download PDFInfo
- Publication number
- CN103872890A CN103872890A CN201410127345.3A CN201410127345A CN103872890A CN 103872890 A CN103872890 A CN 103872890A CN 201410127345 A CN201410127345 A CN 201410127345A CN 103872890 A CN103872890 A CN 103872890A
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- short
- switching power
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000005070 sampling Methods 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 208000031361 Hiccup Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Protection Of Static Devices (AREA)
- Amplifiers (AREA)
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
The present invention relates to electronic technology field, relate in particular to a kind of switching power circuit with short-circuit protection function.
Background technology
At present, Switching Power Supply has become the main flow power supply on market, along with maturing, standardization and the internationalization of Switching Power Supply, more harsh to the requirement of Switching Power Supply in the world.And along with the pay attention to day by day of the world to the energy and environmental issue; the development of Switching Power Supply be applied in energy savings, economize on resources and the aspect such as protection of the environment also imperative; for this reason; famous Switching Power Supply manufacturer especially payes attention in the problems such as energy-conservation, efficiency, power consumption, environmental protection both at home and abroad, and the volume to Switching Power Supply, weight, quality, safety, environment for use, centralized monitor, parallel operation dilatation etc. have simultaneously proposed more requirements.
Current, traditional Switching Power Supply does not consider to cause in the time that load equipment (external devices or external equipment) is short-circuited power consumption and the problem of temperature rise of switching power circuit.In prior art in order to address this problem, switching power circuit is improved, for example, output short-circuit is adopted to self-locking mode, find short circuit phenomenon once detect, close output voltage, so just caused Switching Power Supply again to reset and started shooting and could normally work, also reduced the load capacity of Switching Power Supply simultaneously; In addition, also have another kind of Switching Power Supply to adopt on output short-circuit and play the generation of dealing with short-circuit conditions every the mode of (certainly recovering).Although this technical scheme can play the effect of short-circuit protection to a certain extent, it is the Switching Power Supply with the control of constant current constant voltage mode of operation thereby be difficult to realize parallel operation dilatation and the application of limit switch power supply not.And shortcoming is when pure constant current constant voltage type Switching Power Supply output short-circuit, Switching Power Supply (approximately 1000 watts) generally has the loss of tens watts, thereby cause the waste of the energy, and also can cause the requirement that exceedes safety standard along with the temperature rise of power supply, there is serious potential safety hazard, can not meet energy-saving and environmental protection requirement simultaneously.
Summary of the invention
Technical problem to be solved by this invention is, a kind of switching power circuit with short-circuit protection function is provided, and can in the time being short-circuited, reduce or close output voltage signal, protection switch power circuit energy savings consumption, and realize the parallel function of power supply.
For solving above technical problem, the invention provides a kind of switching power circuit with short-circuit protection function, comprising:
Main power conversion circuit, by incoming control signal, controls the electric energy transfer process of resonant controller chip, and the voltage signal of power input is carried out to power conversion, reduces output voltage signal, with protection switch power circuit in the time being short-circuited;
Constant-current and constant-voltage control circuit, is provided with current loop and voltage loop, the voltage signal of the output voltage terminal of Real-Time Monitoring Switching Power Supply, and in the time that switching power circuit is short-circuited, control described switching power circuit and be operated in constant current constant voltage pattern;
And; short-circuit protection circuit, in the time that Switching Power Supply is short-circuited and detect that described switching power circuit enters constant current constant voltage pattern, sends overvoltage protection signal to described main power conversion circuit; the operating state of controlling described resonant controller chip, reduces output voltage signal.
In one can implementation, described short-circuit protection circuit comprises the first operational amplifier, overvoltage protection signal end and Switching Power Supply secondary feeder ear, and, the peripheral circuit being formed by the first diode, the second diode, the first resistance, the second resistance, the 3rd resistance, the 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 reflector;
Wherein, described protection optocoupler reflector is connected successively with described the first resistance, the first diode, and the minus earth of described protection optocoupler reflector, anode are connected with arbitrary end of described the first resistance; Described the first diode is common-cathode dual-diode, and an anode of described the first diode is connected with described overvoltage protection signal end, another anode of described the first diode and the anodic bonding of described the second diode;
One end ground connection of described the first electric capacity, the anodic bonding of the other end and described the second diode; The negative electrode of described the second diode is connected after described the second resistance and is connected on the normal phase input end of described the first operational amplifier; The positive power source terminal of described the first operational amplifier is described Switching Power Supply secondary feeder ear; The negative power end ground connection of described the first operational amplifier; One end ground connection of described the second electric capacity, the other end is connected to described Switching Power Supply secondary feeder ear; One end ground connection of described the 3rd electric capacity, the other end is connected to the normal phase input end of described the first operational amplifier;
One end of described the 3rd resistance is connected to the inverting input of described the first operational amplifier, and the other end is reference voltage terminal; One end of the 4th resistance is connected with the inverting input of described the first operational amplifier, other end ground connection; The anodic bonding of the output of described the first operational amplifier and the second diode;
One end ground connection of described the 5th resistance, the other end is connected with the normal phase input end of described the first operational amplifier; One end of described the 6th resistance is connected with the normal phase input end of described the first operational amplifier, and the other end is that electric current amplifies sampling end; One end ground connection of described the 4th electric capacity, the other end is connected on the inverting input of described the first operational amplifier.
Preferably, described short-circuit protection circuit is by regulating the resistance of described the second resistance, and control switch power circuit enters self-locking state or certainly returns to form.
Further, described short-circuit protection circuit also comprises the second operational amplifier, output voltage test side, mode of operation control end, and, the peripheral circuit being formed by the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 3rd diode, the 5th electric capacity and first crystal triode;
Wherein, one end of described the 7th resistance is amplified sampling end with described electric current and is connected, and the other end is connected on the output of described the second operational amplifier; Described the 5th resistance, described the 6th resistance, described the 7th resistance and described the 3rd electric capacity form delay circuit;
The negative electrode of described the 3rd diode is connected on the output of described the second operational amplifier, and anode is connected with one end of described the 8th resistance;
Described the 8th resistance is connected on described reference voltage terminal after connecting with described the 9th resistance; The normal phase input end of described the second operational amplifier is connected on the series connection point of described the 8th resistance and the 9th resistance; One end of described the tenth resistance is connected to the inverting input of described the second operational amplifier, and the other end is described output voltage test side;
The emitter of described first crystal triode amplifies sampling end with described electric current and is connected, grounded collector, and base stage is connected on the series connection point of the 11 resistance and the 12 resistance; One end ground connection after described the 11 resistance is connected with the 12 resistance, the other end is described mode of operation control end; One end ground connection after described the 13 resistance and the 5th Capacitance parallel connection, the other end is connected with the normal phase input end of described the second operational amplifier.
A kind of switching power circuit with short-circuit protection function provided by the invention, there is following beneficial effect: by main power conversion circuit is set, by incoming control signal, the electric energy transfer process of resonant controller chip is wherein controlled, the voltage signal of power input is carried out to power conversion, reduce output voltage signal, with protection switch power circuit in the time being short-circuited; Be operated in constant current constant voltage pattern by switching power circuit described in constant-current and constant-voltage control circuit control is set, improve the load capacity of switching power circuit; By short-circuit protection circuit being set to drive main power conversion circuit in the time being short-circuited, reduce output voltage signal, protection switch power circuit is also realized the parallel function of switching power circuit.Therefore, switching power circuit provided by the invention is being realized on the basis of short-circuit protection, has solved power consumption and problem of temperature rise that output short-circuit brings simultaneously, has strengthened the load capacity and the scope of application of having widened switching power circuit of switching power circuit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first embodiment of the switching power circuit with short-circuit protection function provided by the invention.
Fig. 2 is a kind of physical circuit schematic diagram of the short-circuit protection circuit that provides of first embodiment of the invention.
Fig. 3 is another the physical circuit schematic diagram that the invention provides the short-circuit protection circuit that the second embodiment provides.
Fig. 4 is a kind of circuit theory diagrams of the constant-current and constant-voltage control circuit that provides of second embodiment of the invention.
Fig. 5 is a kind of complete circuit schematic diagram of the switching power circuit that provides of second embodiment of the invention.
Fig. 6 is the partial circuit schematic diagram of the main power conversion circuit that provides of second embodiment of the invention.
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 clearly and completely described.
Referring to Fig. 1, it is the structural representation of the first embodiment of the switching power circuit with short-circuit protection function provided by the invention.
Particularly, the described switching power circuit with short-circuit protection function, comprising:
Main power conversion circuit 100, by incoming control signal, controls the electric energy transfer process of resonant controller chip, and the voltage signal of power input is carried out to power conversion, reduces output voltage signal, with protection switch power circuit in the time being short-circuited;
Constant-current and constant-voltage control circuit 200, is provided with current loop and voltage loop, the voltage signal of the output voltage terminal of Real-Time Monitoring Switching Power Supply, and in the time that switching power circuit is short-circuited, control described switching power circuit and be operated in constant current constant voltage pattern;
And; short-circuit protection circuit 300, in the time that Switching Power Supply is short-circuited and detect that described switching power circuit enters constant current constant voltage pattern, sends overvoltage protection signal to described main power conversion circuit 100; the operating state of controlling described resonant controller chip, reduces output voltage signal.
In the present embodiment, described short-circuit protection circuit 300 can adopt multiple implementation to realize.
Referring to Fig. 2, it is a kind of physical circuit schematic diagram of the short-circuit protection circuit that provides of first embodiment of the invention.
In one can implementation; described short-circuit protection circuit 300 comprises the first operational amplifier U1, overvoltage protection signal end OVP and Switching Power Supply secondary feeder ear VDD; and, the peripheral circuit being formed by the first diode D1, the second diode D2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4 and protection optocoupler reflector PC2A.
Wherein, described protection optocoupler reflector PC2A connects successively with described the first resistance R 1, the first diode D1, and the minus earth of described protection optocoupler reflector PC2A, anode are connected with arbitrary end of described the first resistance R 1; Described the first diode D1 is common-cathode dual-diode, and an anode of described the first diode D1 is connected with described overvoltage protection signal end OVP, another anode of described the first diode D1 and the anodic bonding of described the second diode D2.
One end ground connection of described the first capacitor C 1, the anodic bonding of the other end and described the second diode D2; The negative electrode of described the second diode D2 is connected after described the second resistance R 2 and is connected on the in-phase input end of described the first operational amplifier U1; The positive power source terminal of described the first operational amplifier U1 is described Switching Power Supply secondary feeder ear VDD; The negative power end ground connection of described the first operational amplifier U1; One end ground connection of described the second capacitor C 2, the other end is connected to described Switching Power Supply secondary feeder ear VDD; One end ground connection of described the 3rd capacitor C 3, the other end is connected to the normal phase input end of described the first operational amplifier U1.
One end of described the 3rd resistance R 3 is connected to the inverting input of described the first operational amplifier U1, and the other end is reference voltage terminal REF; One end of the 4th resistance R 4 is connected with the inverting input of described the first operational amplifier U1, other end ground connection; The anodic bonding of the output of described the first operational amplifier U1 and the second diode D2; When concrete enforcement, preferably, the voltage signal of described reference voltage terminal REF access 5V is reference voltage.
One end ground connection of described the 5th resistance R 5, the other end is connected with the normal phase input end of described the first operational amplifier U1; One end of described the 6th resistance R 6 is connected with the normal phase input end of described the first operational amplifier U1, and the other end is that electric current amplifies sampling end IS; One end ground connection of described the 4th capacitor C 4, the other end is connected on the inverting input of described the first operational amplifier U1.
Further, while specifically enforcement, described short-circuit protection circuit 300 is by regulating the resistance of described the second resistance R 2, and control switch power circuit enters self-locking state or certainly returns to form.In the time that the resistance of the second resistance R 2 is larger, short-circuit protection circuit 300, in the time short circuit being detected, starts and enters lock-out state; When the resistance of the second resistance R 2 hour, short-circuit protection circuit 300 enters from recovery mode of operation in the time being short-circuited, i.e. intermittent start (having the hiccups) is to obtain self-healing object.
In second embodiment of the invention, the basic comprising of switching power circuit and circuit theory are all identical with the first embodiment.The difference of the present embodiment and the first embodiment is: on the basis of the first embodiment; short-circuit protection circuit is done to further improvement; power consumption and the problem of temperature rise during with solution switching power circuit output short-circuit, brought; and improve the load capacity of switching power circuit, and realize the parallel operation design of multiple Switching Power Supplies.
Referring to Fig. 3, it is another the physical circuit schematic diagram that the invention provides the short-circuit protection circuit that the second embodiment provides.
As shown in Figure 3; on the basis of the first embodiment; further; described short-circuit protection circuit 300 also comprises the second operational amplifier U2, output voltage test side V-CT, mode of operation control end MODE; and, the peripheral circuit being formed by the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R 13, the 3rd diode D3, the 5th capacitor C 5 and first crystal triode Q1.
Wherein, one end of described the 7th resistance R 7 is amplified sampling end IS with described electric current and is connected, and the other end is connected on the output of described the second operational amplifier U2; Described the 5th resistance R 5, described the 6th resistance R 6, described the 7th resistance R 7 form delay circuit with described the 3rd capacitor C 3.
The negative electrode of described the 3rd diode D3 is connected on the output of described the second operational amplifier U2, and anode is connected with one end of described the 8th resistance R 8.
Described the 8th resistance R 8 is connected on described reference voltage terminal REF after connecting with described the 9th resistance R 9; The normal phase input end of described the second operational amplifier U2 is connected on the series connection point of described the 8th resistance R 8 and the 9th resistance R 9; One end of described the tenth resistance R 10 is connected to the inverting input of described the second operational amplifier U2, and the other end is described output voltage test side V-CT.
The emitter of described first crystal triode Q1 amplifies sampling end IS with described electric current and is connected, grounded collector, and base stage is connected on the series connection point of the 11 resistance R 11 and the 12 resistance R 12; One end ground connection after described the 11 resistance R 11 is connected with the 12 resistance R 12, the other end is described mode of operation control end MODE; One end ground connection after described the 13 resistance R 13 is in parallel with the 5th capacitor C 5, the other end is connected with the normal phase input end of described the second operational amplifier U2.
When concrete enforcement, in the time that switching power circuit is short-circuited, described mode of operation control end MODE output high level, controls described first crystal triode Q1 and enter cut-off state, thereby control switch power circuit enters constant current mode.
Further, the described constant-current and constant-voltage control circuit that the present embodiment provides also comprises current amplification circuit, and described current amplification circuit is connected successively with described current loop, described voltage loop.Preferably, described constant-current and constant-voltage control circuit also comprises the overvoltage crowbar being connected with described voltage loop.
Referring to Fig. 4, be a kind of circuit theory diagrams of the constant-current and constant-voltage control circuit that provides of second embodiment of the invention.
When concrete enforcement, constant-current and constant-voltage control circuit is provided with resistance R 14～R40, diode D4～D9, capacitor C 6～C22, operational amplifier U3～U6, and the feedback optocoupler reflector PC1A on current loop and voltage loop and former limit.Constant-current and constant-voltage control circuit is in conjunction with peripheral circuit; also play a kind of effect of short-circuit protection; overvoltage signal protection end OVP is connected with short-circuit protection circuit; by controlling the resistance value of the second resistance R 2; control its resistance value and be operated in self-locking pattern when larger, resistance value hour is operated in from recovery pattern.
Referring to Fig. 5, it is a kind of complete circuit schematic diagram of the switching power circuit that provides of second embodiment of the invention.
The basic functional principle of the switching power circuit that the present embodiment provides is: in the time that switching power circuit output is short-circuited, the current sampling signal that current sample end-IS place gathers enters constant current mode through amplifying circuit, current loop, mode of operation control end MODE output high level, causes first crystal triode Q1 to enter cut-off state; Now, in the time that output voltage test side V-CT detects the reference voltage that the output voltage that obtains accesses lower than the positive input of the second operational amplifier U2, cause the output signal upset of the second operational amplifier U2, the output of the second operational amplifier U2 is high level signal, the delay circuit forming through the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and the 3rd capacitor C 3 carries out after time delay, and signal is sent to the first operation amplifier comparator U1 and compares; Signal after is relatively exported from the first operational amplifier U1 output; after processing, the first diode D1, the first resistance R 1 and protection optocoupler reflector PC2A feed back to again the control chip on former limit; be in described resonant controller chip; thereby control switch power circuit cuts out output voltage signal, protection switch power circuit.
When concrete enforcement, according to above circuit working principle, when switching power circuit enters guard mode, must meet following three conditions: first, switching power circuit enters constant current mode, i.e. first crystal triode Q1 cut-off; The second, the voltage signal that output voltage test side V-CT detects is less than reference voltage (reference voltage value can design as required, and preferably, adopting the voltage signal of 5V is reference voltage); The 3rd, switching power circuit enters the time of constant current mode, is greater than the time of delay of delay circuit.
Referring to Fig. 6, it is the partial circuit schematic diagram of the main power conversion circuit that provides of second embodiment of the invention.
Particularly, described main power conversion circuit 100 comprises: the control signal sending for accessing described protection optocoupler reflector PC2A, and in the time being short-circuited, control described resonant controller chip U7 and close the protection optocoupler receiver pc 2B of output voltage.Therefore; the control signal sending from protection optocoupler reflector PC2A can receive by the set protection optocoupler receiver pc 2B of main power conversion circuit 100; thereby reach the object of the output voltage values of control switch power circuit, whether be short-circuited and whether control powered-down output voltage according to switching power circuit.When concrete enforcement, described resonant controller chip U7 is provided with inhibit signal end DELAY, and is connected with described protection optocoupler receiver by described inhibit signal end, the control signal that access is sent by described short-circuit protection circuit.
Therefore; the switching power circuit that second embodiment of the invention provides relies on circuit parameter; comprise the progressively relatively processing of current sampling signal, output voltage, RC time constant; control the input signal of the inhibit signal end DELAY of resonant controller chip by protection optocoupler reflector; in the time short circuit being detected, enter self-locking pattern or certainly recover pattern thereby reach control switch power circuit, and reaching the object of short-circuit protection.
This kind of circuit design can be in the object that reaches short-circuit protection, has solved power supply power consumption and problem of temperature rise that short circuit causes, and overcomes traditional switch power circuit and can only realize the poor defect with narrow application range of a kind of short-circuit protection of pattern, load capacity.And because switching power circuit has retained constant current constant voltage function, therefore can realize easily N+1 parallel operation dilatation; And neatly different loads is powered according to client's demand, therefore reduced the printed circuit board (PCB) to PCB() change plate number of times; Because circuit design is comparatively flexible, reduce taking up room of design cost and pcb board, therefore greatly strengthen the practicality of switching power circuit.
It should be noted that; Fig. 6 has only drawn and the inhibit signal end DELAY(pin 2 of protection optocoupler receiver pc 2B and resonant controller chip U7) be connected and associated electrical components and parts, and feedback light coupling receiver PC1B and with the catenation principle figure of resonant controller chip U7.When concrete enforcement, resonant controller chip U7 must also be provided with peripheral circuit by other pin, with the output voltage of control switch power circuit.Preferably, can to adopt model be that the chip of L6599ADTR is realized to described resonant controller chip U7.
Preferably, the switching power circuit that the embodiment of the present invention provides can be applicable to PWM(Pulse Width Modulation, pulse-width modulation) in control chip.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. with a switching power circuit for short-circuit protection function, it is characterized in that, comprising:
Main power conversion circuit, by incoming control signal, controls the electric energy transfer process of resonant controller chip, and the voltage signal of power input is carried out to power conversion, reduces output voltage signal, with protection switch power circuit in the time being short-circuited;
Constant-current and constant-voltage control circuit, is provided with current loop and voltage loop, the voltage signal of the output voltage terminal of Real-Time Monitoring Switching Power Supply, and in the time that switching power circuit is short-circuited, control described switching power circuit and be operated in constant current constant voltage pattern;
And; short-circuit protection circuit, in the time that Switching Power Supply is short-circuited and detect that described switching power circuit enters constant current constant voltage pattern, sends overvoltage protection signal to described main power conversion circuit; the operating state of controlling described resonant controller chip, reduces output voltage signal.
2. the switching power circuit with short-circuit protection function as claimed in claim 1, it is characterized in that, described short-circuit protection circuit comprises the first operational amplifier, overvoltage protection signal end and Switching Power Supply secondary feeder ear, and, the peripheral circuit being formed by the first diode, the second diode, the first resistance, the second resistance, the 3rd resistance, the 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 reflector;
Wherein, described protection optocoupler reflector is connected successively with described the first resistance, the first diode, and the minus earth of described protection optocoupler reflector, anode are connected with arbitrary end of described the first resistance; Described the first diode is common-cathode dual-diode, and an anode of described the first diode is connected with described overvoltage protection signal end, another anode of described the first diode and the anodic bonding of described the second diode;
One end ground connection of described the first electric capacity, the anodic bonding of the other end and described the second diode; The negative electrode of described the second diode is connected after described the second resistance and is connected on the normal phase input end of described the first operational amplifier; The positive power source terminal of described the first operational amplifier is described Switching Power Supply secondary feeder ear; The negative power end ground connection of described the first operational amplifier; One end ground connection of described the second electric capacity, the other end is connected to described Switching Power Supply secondary feeder ear; One end ground connection of described the 3rd electric capacity, the other end is connected to the normal phase input end of described the first operational amplifier;
One end of described the 3rd resistance is connected to the inverting input of described the first operational amplifier, and the other end is reference voltage terminal; One end of the 4th resistance is connected with the inverting input of described the first operational amplifier, other end ground connection; The anodic bonding of the output of described the first operational amplifier and the second diode;
One end ground connection of described the 5th resistance, the other end is connected with the normal phase input end of described the first operational amplifier; One end of described the 6th resistance is connected with the normal phase input end of described the first operational amplifier, and the other end is that electric current amplifies sampling end; One end ground connection of described the 4th electric capacity, the other end is connected on the inverting input of described the first operational amplifier.
3. the switching power circuit with short-circuit protection function as claimed in claim 2, is characterized in that, described short-circuit protection circuit is by regulating the resistance of described the second resistance, and control switch power circuit enters self-locking state or certainly returns to form.
4. the switching power circuit with short-circuit protection function as claimed in claim 2, it is characterized in that, described short-circuit protection circuit also comprises the second operational amplifier, output voltage test side, mode of operation control end, and, the peripheral circuit being formed by the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 3rd diode, the 5th electric capacity and first crystal triode;
Wherein, one end of described the 7th resistance is amplified sampling end with described electric current and is connected, and the other end is connected on the output of described the second operational amplifier; Described the 5th resistance, described the 6th resistance, described the 7th resistance and described the 3rd electric capacity form delay circuit;
The negative electrode of described the 3rd diode is connected on the output of described the second operational amplifier, and anode is connected with one end of described the 8th resistance;
Described the 8th resistance is connected on described reference voltage terminal after connecting with described the 9th resistance; The normal phase input end of described the second operational amplifier is connected on the series connection point of described the 8th resistance and the 9th resistance; One end of described the tenth resistance is connected to the inverting input of described the second operational amplifier, and the other end is described output voltage test side;
The emitter of described first crystal triode amplifies sampling end with described electric current and is connected, grounded collector, and base stage is connected on the series connection point of the 11 resistance and the 12 resistance; One end ground connection after described the 11 resistance is connected with the 12 resistance, the other end is described mode of operation control end; One end ground connection after described the 13 resistance and the 5th Capacitance parallel connection, the other end is connected with the normal phase input end of described the second operational amplifier.
5. the switching power circuit with short-circuit protection function as claimed in claim 4; it is characterized in that; described main power conversion circuit comprises: the control signal sending for accessing described protection optocoupler reflector, and in the time being short-circuited, control described resonant controller chip and close the protection optocoupler receiver of output voltage.
6. the switching power circuit with short-circuit protection function as described in claim 3～5 any one; it is characterized in that; in the time that switching power circuit is short-circuited; described mode of operation control end output high level; control described first crystal triode and enter cut-off state, thereby control switch power circuit enters constant current mode.
7. the switching power circuit with short-circuit protection function as claimed in claim 6; it is characterized in that; described resonant controller chip is provided with inhibit signal end, and is connected with described protection optocoupler receiver by described inhibit signal end, the control signal that access is sent by described short-circuit protection circuit.
8. the switching power circuit with short-circuit protection function as claimed in claim 7, is characterized in that, described constant-current and constant-voltage control circuit also comprises current amplification circuit, and described current amplification circuit is connected successively with described current loop, described voltage loop.
9. the switching power circuit with short-circuit protection function as claimed in claim 8, is characterized in that, described constant-current and constant-voltage control circuit also comprises the overvoltage crowbar being connected with described voltage loop.
10. the switching power circuit with short-circuit protection function as claimed in claim 9, is characterized in that, described resonant controller chip is that model is the chip of L6599ADTR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127345.3A CN103872890B (en) | 2014-03-31 | 2014-03-31 | Switching power supply circuit with short-circuit protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127345.3A CN103872890B (en) | 2014-03-31 | 2014-03-31 | Switching power supply circuit with short-circuit protection function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103872890A true CN103872890A (en) | 2014-06-18 |
| CN103872890B CN103872890B (en) | 2017-03-22 |
Family
ID=50911107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410127345.3A Active CN103872890B (en) | 2014-03-31 | 2014-03-31 | Switching power supply circuit with short-circuit protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103872890B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779583A (en) * | 2015-04-30 | 2015-07-15 | 西安科技大学 | Switching power supply voltage type output short circuit protection circuit and design method thereof |
| CN112368931A (en) * | 2018-06-28 | 2021-02-12 | 法雷奥电机设备公司 | System for controlling a switch and switch arm |
| WO2022179612A1 (en) * | 2021-02-26 | 2022-09-01 | 西安微电子技术研究所 | Multi-mode combined short-circuit protection circuit, and working method and use thereof |
| CN117460122A (en) * | 2023-12-21 | 2024-01-26 | 厦门普为光电科技有限公司 | Lighting device with fault detection and self-locking control functions |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564421A (en) * | 2004-03-17 | 2005-01-12 | 毛锦铭 | Charger for lithium cell |
| CN201821141U (en) * | 2010-10-18 | 2011-05-04 | 李彬斌 | Charger device with direct current voltage reduction and conversion function |
| CN202210884U (en) * | 2011-08-26 | 2012-05-02 | 上海新华电子设备有限公司 | Multi-path constant current driving power supply for LED illumination |
| CN202424283U (en) * | 2012-02-09 | 2012-09-05 | 广州市君盘实业有限公司 | Charger based on single-chip three-end TOP22X integrated chip |
| CN202586463U (en) * | 2012-04-16 | 2012-12-05 | 无锡市威德盛电子有限公司 | Nickel-cadmium charger control circuit |
| CN103442501A (en) * | 2013-09-12 | 2013-12-11 | 江华 | Forced constant flow source dimming LED (Light Emitting Diode) lamp |
-
2014
- 2014-03-31 CN CN201410127345.3A patent/CN103872890B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564421A (en) * | 2004-03-17 | 2005-01-12 | 毛锦铭 | Charger for lithium cell |
| CN201821141U (en) * | 2010-10-18 | 2011-05-04 | 李彬斌 | Charger device with direct current voltage reduction and conversion function |
| CN202210884U (en) * | 2011-08-26 | 2012-05-02 | 上海新华电子设备有限公司 | Multi-path constant current driving power supply for LED illumination |
| CN202424283U (en) * | 2012-02-09 | 2012-09-05 | 广州市君盘实业有限公司 | Charger based on single-chip three-end TOP22X integrated chip |
| CN202586463U (en) * | 2012-04-16 | 2012-12-05 | 无锡市威德盛电子有限公司 | Nickel-cadmium charger control circuit |
| CN103442501A (en) * | 2013-09-12 | 2013-12-11 | 江华 | Forced constant flow source dimming LED (Light Emitting Diode) lamp |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779583A (en) * | 2015-04-30 | 2015-07-15 | 西安科技大学 | Switching power supply voltage type output short circuit protection circuit and design method thereof |
| 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 |
| CN112368931A (en) * | 2018-06-28 | 2021-02-12 | 法雷奥电机设备公司 | System for controlling a switch and switch arm |
| WO2022179612A1 (en) * | 2021-02-26 | 2022-09-01 | 西安微电子技术研究所 | Multi-mode combined short-circuit protection circuit, and working method and use thereof |
| CN117460122A (en) * | 2023-12-21 | 2024-01-26 | 厦门普为光电科技有限公司 | Lighting device with fault detection and self-locking control functions |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103872890B (en) | 2017-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102628889B (en) | Voltage sampling circuit | |
| CN203443031U (en) | Low standby power consumption control circuit and air conditioner | |
| CN204258271U (en) | A kind of under-voltage protective switch of the short circuit supply unit | |
| CN203895095U (en) | Display screen power supply circuit that is shaded | |
| CN204287446U (en) | A kind of power-fail detection circuit | |
| CN103872890A (en) | Switching power supply circuit with short-circuit protection function | |
| CN205319797U (en) | Industrial automation produces monitored control system | |
| CN103425057A (en) | Switch circuit and electronic device with same | |
| CN204230883U (en) | A kind of electric machine controller for motor vehicle electric capacity active discharge circuit | |
| CN104218535A (en) | An active PFC over-current protection circuit | |
| CN203086113U (en) | Protection circuit allowing setting of protection threshold | |
| CN204089330U (en) | A kind of adaptive power-supply battery supplies power with double circuit device | |
| CN203722230U (en) | Simple protective circuit against reversal connection of power supply | |
| CN203572908U (en) | Power-failure status detection alarm circuit | |
| CN203217292U (en) | State machine-based multifunctional electronic appliance control circuit | |
| CN103899561A (en) | Fan control circuit | |
| CN203367662U (en) | Socket controlling on and off according to load current signal | |
| CN203501377U (en) | Controller of embedded central air conditioner monitoring system | |
| CN102780401B (en) | Intelligent control circuit and intelligent control method of switch power supply efficiency | |
| CN204462339U (en) | A kind of electric quantity detecting circuit and solar water heater control panel | |
| CN202840964U (en) | Intelligent switch power energy efficiency control circuit | |
| CN202886443U (en) | Voltage sampling circuit | |
| CN105047477A (en) | Relay energy-saving control circuit | |
| CN203894694U (en) | Low-power power circuit of computer | |
| CN209913487U (en) | Fast power-off circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |