CN201113793Y - Switch power source output control circuit - Google Patents
Switch power source output control circuit Download PDFInfo
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- CN201113793Y CN201113793Y CNU2007201224471U CN200720122447U CN201113793Y CN 201113793 Y CN201113793 Y CN 201113793Y CN U2007201224471 U CNU2007201224471 U CN U2007201224471U CN 200720122447 U CN200720122447 U CN 200720122447U CN 201113793 Y CN201113793 Y CN 201113793Y
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Abstract
The utility model discloses an output control circuit for a switching power supply, comprising an auxiliary power supply, a control module and a current regulating module, wherein, an output end of the auxiliary power supply is coupled to the control module and the current regulating module; an output end of the current regulating module is coupled to an input end of the control module; an output end of the control module is coupled to a control end of a switch component in a switching power supply voltage output module; the current regulating module comprises a signal sampling circuit which is used for acquiring an output current signal of the switching power supply voltage output module and transforming the output current signal into a sampling point voltage signal and a current-limiting regulating circuit which is used for providing an adjustable current-limiting reference voltage signal and generating a current regulatory signal according to the sampling point voltage signal at the same time. In the utility model, the current regulating module can continuously regulate an output current-limiting point and the control module can generate a corresponding switching control signal according to the current regulatory signal outputted by the current regulating module, thereby realizing current-limiting regulation of the output current.
Description
Technical field
The utility model relates to power technology, especially relates to a kind of output control circuit of Switching Power Supply.
Background technology
Switching Power Supply has obtained application more and more widely because of advantage such as its efficient height, volume be little.In switching power circuit, for avoiding causing that because of load current is excessive the situation that Switching Power Supply is damaged takes place, often adopt the output current control technology, work with security and stability to guarantee Switching Power Supply.Usually, control circuit is taken a sample to output current earlier, promptly in output loop the series connection sample resistance, produce pressure drop when output current is flowed through sample resistance, this pressure drop is delivered to the input of comparator as signal, compare with the reference voltage that is connected to the other end, when output current surpasses certain value, the output of comparator can be adjusted the width of control pulsewidth, reduces output current, thereby reaches the purpose of current limliting.But the current limliting value of foregoing circuit is fixed, though can make Switching Power Supply output reach constant current according to reference voltage, when being difficult to satisfy load variations for the requirement of different output current.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of output control circuit of Switching Power Supply, can realize the adjusting of output current current limliting, when satisfying load variations for the different requirement for restriction of output current.
The further technical problem to be solved of the utility model is to provide a kind of switching power source control circuit of Adjustable Output Voltage.
The further again technical problem to be solved of the utility model is to provide a kind of output control circuit of Switching Power Supply, can make output voltage make it be stabilized in this voltage when being adjusted to required voltage, and can further carry out overvoltage protection.
Above-mentioned technical problem to be solved in the utility model is achieved through the following technical solutions:
A kind of output control circuit of Switching Power Supply, comprise accessory power supply, control module and current regulating module, the output of described accessory power supply is coupled to described control module and described current regulating module, the output of described current regulating module is coupled to the input of described control module, the output of described control module is coupled to the control end of switching device in the Switching Power Supply direct voltage output module, its characteristics are, described current regulating module comprises: signal sample circuit, and it is used to gather the output current signal of Switching Power Supply direct voltage output module and is translated into the sample amplitude when reproduced signal; The current limliting regulating circuit, it is used to provide adjustable current limliting reference voltage signal and generates current regulating signal according to described adjustable current limliting reference voltage signal and described sample amplitude when reproduced signal, exports the Current Regulation input of described control module to.
Preferably, described signal sample circuit comprises sampling resistor, and described current limliting regulating circuit comprises second potentiometer, the 3rd potentiometer, the 3rd diode and the 3rd comparator;
Described sampling resistor is serially connected with in the output loop of Switching Power Supply direct voltage output module in the mode that the one end is coupled in the output negative terminal of Switching Power Supply direct voltage output module, and its other end also is connected to described second potentiometer; The adjustable side of described second potentiometer is coupled to the in-phase input end and described the 3rd potentiometer of the negative electrode of described the 3rd diode, described the 3rd comparator, the adjustable side of described the 3rd potentiometer is coupled to the accessory power supply anode, the anode of described the 3rd diode connects described the 3rd comparator inverting input, the inverting input of described the 3rd comparator also is coupled to ground, the negative electrode of described the 4th diode of its output termination, the anode of described the 4th diode connects the Current Regulation input of described control module.
Further, can also comprise Voltage Regulator Module, it will offer described control module after will being transformed to output voltage signal from the voltage signal of described accessory power supply, and described control module is exported corresponding switch controlling signal according to the switching device of this output voltage signal in Switching Power Supply direct voltage output module.
Described Voltage Regulator Module comprises first potentiometer and first triode, described first potentiometer, one end is coupled to the accessory power supply anode, another termination base-level signal, the base stage of described first triode is coupled in its adjustable side, the emitter-coupled of described first triode is to accessory power supply, and collector coupled is to the voltage-regulation input of described control module.
Further, also comprise voltage stabilizing circuit, the input of described voltage stabilizing circuit is coupled to the output plus terminal of Switching Power Supply direct voltage output module, and output is coupled to the voltage-regulation input of described control module.
Described voltage stabilizing circuit comprise be serially connected in and the output plus terminal of Switching Power Supply direct voltage output module between first divider resistance and second divider resistance, the connected node of described first divider resistance and second divider resistance links to each other with the collector electrode of described first triode.
Further, also comprise overvoltage protective module, described overvoltage protective module input is gathered the voltage of the output plus terminal output of Switching Power Supply direct voltage output module, and output is coupled to the overvoltage protection input of described control module.
Described overvoltage protective module comprises first comparator, the 6th resistance, the 7th resistance and second diode;
Described the 6th resistance and the 7th resistance string be connected on and the output plus terminal of Switching Power Supply direct voltage output module between; The in-phase input end of described first comparator is coupled to the connected node of the 6th resistance and the 7th resistance; its inverting input connects base-level signal; its output is coupled to the anode of second diode, and the negative electrode of described second diode is coupled to described overvoltage protection input.
Described overvoltage protective module also can comprise second comparator, the 9th resistance and the tenth resistance;
Described the 9th resistance and the tenth resistance string be connected on and the accessory power supply anode between, the inverting input of described second comparator is coupled to the connected node of the 9th resistance and the tenth resistance, its in-phase input end connects base-level signal, and its output is coupled to the anode of described second diode.
Described control module can adopt PWM (pulse width modulation) control device.
The utility model beneficial technical effects is:
1) in the utility model, signal sample circuit in the current regulating module is gathered the output current signal of direct voltage output module and is translated into the sample amplitude when reproduced signal, the current limliting regulating circuit provides adjustable current limliting reference voltage signal, and according to adjustable current limliting reference voltage signal, sample amplitude when reproduced signal generation current regulating signal, control module is adjusted switch controlling signal according to this signal again, because of the current limliting that can realize output current is regulated.Under the optimal way, can to further conversion of sample amplitude when reproduced signal or adjusting current limliting reference voltage signal, change the Current limited Control condition, promptly realize the adjustable continuously of current-limiting points by potentiometer is set.As when adjustment the 3rd potentiometer makes that the current limliting reference voltage increases, perhaps, when adjustment second potentiometer makes that current-limiting points voltage sample value reduces, carry out the threshold that current limliting is regulated with improving control module, promptly make the higher limit of output current increase, satisfy the different current limliting requirements of load thus output current.
2) the utility model can further have Voltage Regulator Module, Voltage Regulator Module will offer control module after will being transformed to output voltage signal from the voltage signal of accessory power supply, control module is handled according to this output voltage signal, export the switch controlling signal of corresponding duty ratio to the switching device of direct voltage output module, the switching device of Switching Power Supply direct voltage output module is controlled by this switch controlling signal like this, by the switch converters effect, can obtain having taken place the output voltage of respective change at last, thereby satisfy the demand of load different operating voltage.
3) the utility model can further have the voltage stabilizing circuit that is used to realize voltage stabilizing output, output voltage signal by voltage stabilizing circuit sampling direct voltage output module, utilize the voltage signal of being sampled that the output voltage signal of Voltage Regulator Module is adjusted, can reach the purpose of the output voltage voltage stabilizing of direct voltage output module; Also can comprise overvoltage protective module; the voltage signal of overvoltage protective module sampling direct voltage output module output; compare processing back output over-voltage protection conditioning signal with reference voltage signal, control module is adjusted switch controlling signal according to this signal, reaches the purpose of overvoltage protection.
Above-mentioned improvement makes the utility model easy to use, has the dynamic load ability, can effectively be applicable to capacitive, inductive load power supply unit.
Description of drawings
Fig. 1 is the circuit structure block diagram of a kind of execution mode of the utility model;
Fig. 2 is the circuit structure block diagram of the another kind of execution mode of the utility model;
Fig. 3 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Below by specific embodiment and in conjunction with the accompanying drawings the utility model is explained in detail.
Embodiment one:
As shown in Figure 1, the output control circuit of the Switching Power Supply of present embodiment comprises accessory power supply 1, control module 2 and current regulating module.Accessory power supply 1 is coupled to control module 2 and current regulating module, for control module 2 and current regulating module provide-6V voltage and+12V voltage.Wherein, current regulating module comprises signal sample circuit 6 and current limliting adjustment module 7, the output negative terminal of the input termination switch power supply direct voltage output module of signal sample circuit 6, the input of the output termination current limliting adjustment module 7 of signal sample circuit 6, the Current Regulation input of the output termination control module of current limliting adjustment module 7.The control end of the switching device in the output termination Switching Power Supply direct voltage output module of control module 1, the output termination load of Switching Power Supply direct voltage output module.
The physical circuit figure of Switching Power Supply output control circuit sees also Fig. 3.Control module 2 adopts control chip in the present embodiment, for example adopts PWM controller IC 1, and the model of concrete chip can be selected SG3532 for use.The model of the selected chip of comparator in the circuit is LM324.The anode VCC+ of accessory power supply is output as+and 12V, negative terminal VCC-be output as-6V.
The operation principle that present embodiment Switching Power Supply output current limiting is regulated:
The current signal of signal sample circuit 6 sampling direct voltage output module outputs, and be translated into the sample amplitude when reproduced signal and reach current limliting regulating circuit 7, current limliting regulating circuit 7 provides the current limliting reference voltage signal, and according to the Current Regulation input (the 8th pin) of delivering to pwm chip IC1 behind above-mentioned current limliting reference voltage signal and the sample amplitude when reproduced signal generation current regulating signal.
In the signal sample circuit 6, sampling resistor manganese-copper filament R0 is connected to direct voltage output module transformer secondary output winding by energy storage inductor L1 and forms the sample rate current path, and the connected node of the sampling resistor R0 and the second potentiometer VR2 is current limliting sampled point B, B point voltage V
BChange with load RL variation.The first auxiliary resistance R11 that connects the sampled signal end joins with the second auxiliary resistance R12 that connects the reference signal end and forms continuous adjustable current-limiting points C, and the C point voltage is continuous adjustable current-limiting points voltage V
cCan regulate continuously by the second potentiometer VR2.Simultaneously, introduced the current limliting reference voltage signal, therefore, adjusted the maximum reference voltage that the 3rd potentiometer VR4 can set continuous adjustable current-limiting points C, stipulated that this maximum reference voltage is V by the 3rd potentiometer VR4, the second auxiliary resistance R12
A, then | V
B-V
A| voltage range be the continuous adjustable voltage of current-limiting points C.In the current limliting adjustment process, when load variations causes output current change, continuous adjustable current-limiting points voltage V
cWith the maximum reference voltage V that sets by the 3rd potentiometer VR4
ACompare, as long as | V
C|＞| V
A| (the C point voltage is obtained by the sampling of direct voltage output module output negative terminal, is negative value), the 3 pin voltages of the 3rd comparator IC2A become low level, through comparing with 2 pin voltages, are its 1 pin output low level signal by the 3rd comparator IC2A output.This low level signal is 8 pin through the Current Regulation input that the 4th diode D17 feeds back to pwm chip IC1.Pwm chip IC1 detects this current limliting conditioning signal, with reducing the PWM ripple duty ratio of output, adjusts the break-make situation of main circuit switch pipe with this, thereby reaches current limliting, constant current purpose.The above-mentioned course of work can be schematically as follows: according to sample rate current I=V
Out/ RL, RL ↓-I ↑-V
B↑-V
C1 pin of ↑-IC2A ↓-D17 ↓-8 pin of IC1 ↓-PWM ↓-V
Out↓-I ↓.It more than is exactly the closed loop procedure of a current limliting adjusting.On the other hand, need only | V
C|＜| V
A|, the 3 pin voltages of the 3rd comparator IC2A are high level, through with 2 pin voltage ratios, 1 pin output high level signal by the 3rd comparator IC2A, this does not influence the 8 pin voltages of pwm chip IC1 through the 4th diode D17 buffer action, reaches the constant current purpose equally.Regulate the second potentiometer VR2 and the 3rd potentiometer VR4 can change the current limliting condition, promptly current limliting is adjustable.For example, make the maximum reference voltage V of continuous adjustable current-limiting points C when adjusting the 3rd potentiometer VR4
ADuring increase, perhaps, make continuous adjustable current-limiting points C voltage V when adjusting the second potentiometer VR2
cWhen reducing, will improve the threshold that pwm chip IC1 carries out Current limited Control, promptly make the value of the available output current of load increase.
Embodiment two:
On the basis of embodiment one, increased Voltage Regulator Module; press for making Switching Power Supply output constant DC; can further include voltage stabilizing circuit 4; can further include overvoltage protective module 5; the output of Voltage Regulator Module 3 input termination accessory power supplys 1; the output plus terminal of the input termination switch power supply direct voltage output module of voltage stabilizing circuit 4; Voltage Regulator Module 3; the voltage-regulation input of the output link control module 1 of voltage stabilizing circuit 4; the output plus terminal of the input termination switch power supply direct voltage output module of overvoltage protective module 5, the overvoltage protection input of the output termination control module 1 of overvoltage protective module 5.
The physical circuit figure of Switching Power Supply output control circuit sees also Fig. 3.
As shown in Figure 3, Voltage Regulator Module 3 comprises the first potentiometer VR5 and the first triode Q9, the first potentiometer VR5, one end is coupled to accessory power supply anode VCC+, another termination one reference signal, reference signal can be arbitrary reference level, for example the desirable automatic control coremaking of reference level sheet IC1+the base-level signal Vref of 5.1V, the base stage of the first triode Q9 is coupled in the adjustable side of the first potentiometer VR5, the emitter-coupled of the first triode Q9 is to accessory power supply anode VCC+, and 1 pin that the collector electrode of the first triode Q9 meets pwm chip IC1 is its voltage-regulation input.In the side circuit, the peripheral cell that also comprises the first triode Q9, for example first resistance R 22 is connected between the accessory power supply anode VCC+ and the first triode Q9 emitter, second resistance R 23 is connected between the accessory power supply anode VCC+ and the first potentiometer VR5, the 3rd resistance R 24 is connected between the adjustable side of the first triode Q9 base stage and the first potentiometer VR5, the positive pole of the first electrochemical capacitor C19 connects the emitter of the first triode Q9, negative pole connects its base stage, the positive pole of the second electrochemical capacitor C20 connects the base stage of the first triode Q9, minus earth.Can also comprise low-voltage protection circuit; wherein; the second triode Q8 base stage meets accessory power supply anode VCC+ by the 4th resistance R 25; collector electrode connects the voltage-regulation input of control chip IC1; emitter connects the negative electrode of the first diode D18 and the positive pole of the 3rd electrochemical capacitor C21; the minus earth of the 3rd electrochemical capacitor C21, the anode of the first diode D18 meet accessory power supply anode VCC+.
The operation principle of voltage stabilizing is regulated and exported to the present embodiment switch power source output voltage:
When the first potentiometer VR5 is regulated,, know that by the triode characteristic respective change also takes place the voltage of the first triode Q9 collector electrode C with the base voltage of the triode Q9 that wins is changed.Therefore, the 1 pin voltage of pwm chip IC1 also will change.Pwm chip IC1 receives from the regulated voltage signal of 1 pin input, generates the control end output of corresponding switch drive control signal (PWM ripple) to the switching device of direct voltage output module after treatment.For example, present embodiment Switching Power Supply direct voltage output module adopts half bridge circuit, therefore exports two-way drive control signal Drive A and the extremely corresponding switching tube of Drive B respectively by 11,14 pin of pwm chip IC1.Variation has taken place in the PWM pulsewidth of drive control signal Drive A and Drive B, thereby has promptly changed the regulation and control of the duty ratio realization of pwm control signal to each switching tube break-make.The signal of telecommunication that the direct voltage output module generates under the switching tube effect transforms by high frequency transformer, finally obtains having produced the output voltage of respective change again through rectifying and wave-filtering, satisfies the demand of load to different operating voltage.
The effect of low-voltage protection circuit: when the voltage signal of accessory power supply anode VCC+ low; the Q8 conducting; the 1 pin level of pwm chip IC1 is drawn high the input high level signal, and the pwm signal of 11 pin, the output of 14 pin DriveA, DriveB can be closed, and reaches low-voltage variation and turn-offs the output purpose.Otherwise, do not influence the 1 foot control system of the PWM variation of Q9 generation to IC1 when VCC+ height, not conducting of Q8.
Overvoltage protective module 5 comprises the first comparator IC2D, the 6th resistance R 36, the 7th resistance R 37, the second diode D21, in physical circuit, for better effects if can also comprise first capacitor C 31, the 4th electrochemical capacitor C32, the 8th resistance R 38.First capacitor C 31 is connected to the same of the first comparator IC2D; between the inverting input; the 7th resistance R 37 is connected between the in-phase input end of the output plus terminal OUTPUT+V of Switching Power Supply main circuit and the first comparator IC2D; the in-phase input end of the first comparator IC2D is also by the 6th resistance R 36 ground connection; its inverting input meets base-level signal Vref; its output is its voltage protection input by the 8th resistance R 38 and the second diode D21 10 pin that are connected to pwm chip IC1 of serial connection; the negative electrode of the second diode D21 connects the voltage protection input; the power supply of the first comparator IC2D is imported the positive pole of positive termination the 4th electrochemical capacitor C32, the minus earth of the 4th electrochemical capacitor C32.
The operation principle of present embodiment Switching Power Supply output over-voltage protection:
Overvoltage protective module 5 is by the output voltage OUTPUT+V of the 6th resistance R 36 and the 7th resistance R 37 sampling switch power supply direct voltage output modules, and the sampled voltage signal compares through the first comparator IC2D and the base-level signal Vref that takes from control chip IC1.When the sampled voltage signal is higher than base-level signal Vref; feed back to 10 pin of pwm chip IC1 through the second diode D21 by the 14 pin output high level signal of the first comparator IC2D; pwm chip IC1 is according to receiving high level signal; correspondingly carrying out overvoltage protection handles; make from its 11; the drive control signal Drive A of 14 pin output and the PWM pulsewidth of Drive B narrow down; promptly reduce the duty ratio of PWM useful signal; the on-off action of control switch pipe; thereby reduce the output voltage of Switching Power Supply direct voltage output module, reach the effect of overvoltage protection.
On the other hand, overvoltage protective module 5 can further include the second comparator IC2C, second capacitor C 30, the 9th resistance R 32, the tenth resistance R 33 and the 11 resistance R 34.Second capacitor C 30 is connected between same, the inverting input of the second comparator IC2C, the 9th resistance R 32 is connected between the inverting input of the accessory power supply anode VCC+ and the second comparator IC2C, the inverting input of the second comparator IC2C is also by the tenth resistance R 33 ground connection, its in-phase input end meets base-level signal Vref, and its output connects the anode of the second diode D21 by the 11 resistance R 34.
By the voltage signal of the 9th resistance R 32, the tenth resistance R 33 sampling accessory power supply anode VCC+, the sampled voltage signal compares through the second comparator IC2C and the base-level signal Vref that takes from control chip IC1.When the sampled voltage signal is higher than base-level signal Vref; feed back to 10 pin of pwm chip IC1 through the second diode D21 by the 8 pin output high level signal of the second comparator IC2D; pwm chip IC1 correspondingly carries out overvoltage protection and handles according to receiving high level signal.
In sum, the switching power source control circuit of present embodiment can realize that voltage is adjustable, electric current is adjustable, and is easy to use.It has the dynamic load ability, is fit to be applied to capacitive, inductive load power supply unit.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (10)
1. the output control circuit of a Switching Power Supply, comprise accessory power supply (1), control module (2) and current regulating module, the output of described accessory power supply (1) is coupled to described control module (2) and described current regulating module, the output of described current regulating module is coupled to the input of described control module (2), the output of described control module (2) is coupled to the control end of switching device in the Switching Power Supply direct voltage output module, it is characterized in that, described current regulating module comprises: signal sample circuit (6), and it is used to gather the output current signal of Switching Power Supply direct voltage output module and is translated into the sample amplitude when reproduced signal; Current limliting regulating circuit (7), it is used to provide adjustable current limliting reference voltage signal and generates current regulating signal according to described adjustable current limliting reference voltage signal and described sample amplitude when reproduced signal, exports the Current Regulation input of described control module to.
2. the output control circuit of Switching Power Supply according to claim 1, it is characterized in that, described signal sample circuit (6) comprises sampling resistor (R0), and described current limliting regulating circuit (7) comprises second potentiometer (VR2), the 3rd potentiometer (VR4), the 3rd diode (D16) and the 3rd comparator (IC2A);
Described sampling resistor (R0) is serially connected with in the output loop of Switching Power Supply direct voltage output module in the mode that the one end is coupled in the output negative terminal (OUTPUT-) of Switching Power Supply direct voltage output module, and its other end also is connected to described second potentiometer (VR2); The adjustable side of described second potentiometer (VR2) is coupled to the negative electrode of described the 3rd diode (D16), the in-phase input end of described the 3rd comparator (IC2A) and described the 3rd potentiometer (VR4), the adjustable side of described the 3rd potentiometer (VR4) is coupled to accessory power supply anode (VCC+), the anode of described the 3rd diode (D16) connects described the 3rd comparator (IC2A) inverting input, the inverting input of described the 3rd comparator (IC2A) also is coupled to ground, the negative electrode of its output described the 4th diode of termination (D17), the anode of described the 4th diode (D17) connects the Current Regulation input of described control module.
3. the output control circuit of Switching Power Supply according to claim 1 and 2, it is characterized in that, also comprise Voltage Regulator Module (3), it will offer described control module (2) after will being transformed to output voltage signal from the voltage signal of described accessory power supply (1), and described control module (2) is exported corresponding switch controlling signal according to the switching device of this output voltage signal in Switching Power Supply direct voltage output module.
4. the output control circuit of Switching Power Supply according to claim 3, it is characterized in that, described Voltage Regulator Module (3) comprises first potentiometer (VR5) and first triode (Q9), described first potentiometer (VR5) end is coupled to accessory power supply anode (VCC+), another termination base-level signal (Vref), the base stage of described first triode (Q9) is coupled in its adjustable side, the emitter-coupled of described first triode (Q9) is to accessory power supply, and collector coupled is to the voltage-regulation input of described control module (2).
5. the output control circuit of Switching Power Supply according to claim 3, it is characterized in that, also comprise voltage stabilizing circuit (4), the input of described voltage stabilizing circuit (4) is coupled to the output plus terminal (OUTPUT+V) of Switching Power Supply direct voltage output module, and output is coupled to the voltage-regulation input of described control module (2).
6. the output control circuit of Switching Power Supply according to claim 5, it is characterized in that, described voltage stabilizing circuit comprise be serially connected in and the output plus terminal (OUTPUT+V) of Switching Power Supply direct voltage output module between first divider resistance (R8) and second divider resistance (R27), the connected node of described first divider resistance (R8) and second divider resistance (R27) links to each other with the collector electrode of described first triode (Q9).
7. the output control circuit of Switching Power Supply according to claim 1 and 2; it is characterized in that; also comprise overvoltage protective module (5); described overvoltage protective module (5) input is gathered the voltage of output plus terminal (OUTPUT+V) output of Switching Power Supply direct voltage output module, and output is coupled to the overvoltage protection input of described control module (2).
8. the output control circuit of Switching Power Supply according to claim 7 is characterized in that, described overvoltage protective module (5) comprises first comparator (IC2D), the 6th resistance (R36), the 7th resistance (R37) and second diode (D21);
Described the 6th resistance (R36) and the 7th resistance (R37) be serially connected in and the output plus terminal (OUTPUT+V) of Switching Power Supply direct voltage output module between; The in-phase input end of described first comparator (IC2D) is coupled to the connected node of the 6th resistance (R36) and the 7th resistance (R37); its inverting input connects base-level signal (Vref); its output is coupled to the anode of second diode (D21), and the negative electrode of described second diode (D21) is coupled to described overvoltage protection input.
9. the output control circuit of Switching Power Supply according to claim 8 is characterized in that, described overvoltage protective module also comprises second comparator (IC2C), the 9th resistance (R32) and the tenth resistance (R33);
Described the 9th resistance (R32) and the tenth resistance (R33) are serially connected between accessory power supply anode (VCC+) and the ground, the inverting input of described second comparator (IC2C) is coupled to the connected node of the 9th resistance (R32) and the tenth resistance (R33), its in-phase input end meets base-level signal Vref, and its output is coupled to the anode of described second diode (D21).
10. the output control circuit of Switching Power Supply according to claim 1 and 2 is characterized in that, described control module (2) is the PWM control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201224471U CN201113793Y (en) | 2007-08-24 | 2007-08-24 | Switch power source output control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201224471U CN201113793Y (en) | 2007-08-24 | 2007-08-24 | Switch power source output control circuit |
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| CN201113793Y true CN201113793Y (en) | 2008-09-10 |
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| CNU2007201224471U Expired - Fee Related CN201113793Y (en) | 2007-08-24 | 2007-08-24 | Switch power source output control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999073A (en) * | 2011-09-08 | 2013-03-27 | 洛阳嘉盛电源科技有限公司 | Constant-voltage and constant-current control circuit applied to power supply technology |
| CN104569549A (en) * | 2014-12-30 | 2015-04-29 | 上海贝岭股份有限公司 | Switching power supply current detection circuit |
| CN107037854A (en) * | 2015-11-04 | 2017-08-11 | 英飞凌科技股份有限公司 | Strengthen semiconductor switch |
| CN113945754A (en) * | 2021-10-16 | 2022-01-18 | 深圳市卡贝电子技术有限公司 | Power-down protection circuit and protection method |
-
2007
- 2007-08-24 CN CNU2007201224471U patent/CN201113793Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999073A (en) * | 2011-09-08 | 2013-03-27 | 洛阳嘉盛电源科技有限公司 | Constant-voltage and constant-current control circuit applied to power supply technology |
| CN102999073B (en) * | 2011-09-08 | 2015-04-22 | 洛阳嘉盛电源科技有限公司 | Constant-voltage and constant-current control circuit applied to power supply technology |
| CN104569549A (en) * | 2014-12-30 | 2015-04-29 | 上海贝岭股份有限公司 | Switching power supply current detection circuit |
| CN107037854A (en) * | 2015-11-04 | 2017-08-11 | 英飞凌科技股份有限公司 | Strengthen semiconductor switch |
| US10256814B2 (en) | 2015-11-04 | 2019-04-09 | Infineon Technologies Ag | Enhanced semiconductor switch |
| CN113945754A (en) * | 2021-10-16 | 2022-01-18 | 深圳市卡贝电子技术有限公司 | Power-down protection circuit and protection method |
| CN113945754B (en) * | 2021-10-16 | 2024-05-24 | 深圳市卡贝电子技术有限公司 | Power-down protection circuit and protection method |
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Granted publication date: 20080910 Termination date: 20100824 |