CN102969910A - Switching power supply control chip and application circuit thereof - Google Patents
Switching power supply control chip and application circuit thereof Download PDFInfo
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Abstract
The invention provides a switching power supply control chip and an application circuit thereof. The switching power supply control chip comprises a modulator circuit, a constant-voltage loop unit, a comparison circuit, a ground pin, a power supply pin, a direct current output pin and a current signal detection pin, wherein the power supply pin is used for inputting a starting voltage or inputting the external supply voltage of the chip, the direct current output pin is used for outputting low-voltage direct current voltage and inputting the low-voltage direct current voltage as a sampling signal into the chip, and the current signal detection pin is used for detecting a current signal. According to the switching power supply control chip, the constant-voltage loop unit directly receives a voltage feedback signal from the power supply pin, the number of the pins of the switching power supply control chip is reduced to four, the production cost can be effectively lowered, the structure is applicable to TO92 type packaging, thereby further simplifying the packaging process, and beneficial to wide application of the application circuit of the switching power supply control chip.
Description
Technical field
The invention belongs to integrated circuit fields, relate in particular to a kind of Switching Power Supply control chip and application circuit thereof.
Background technology
In daily life, interchange turns DC circuit and usually is applied in the fields such as charger, adapter, light fixture, and at present traditional Switching Power Supply control chip adopts five pin SOT23(Small Outline Transistor, small outline transistor usually) the formula encapsulation.
Fig. 1 shows the Switching Power Supply control chip of existing five pin encapsulation, comprising grounding pin 11, power pins 12, direct current output pin 13, feedback voltage pin 14, input pin 15, constant voltage loop unit 16, modulation circuit 17, reference circuit 18 and comparison circuit 19.
The input of constant voltage loop unit 16 is connected with the inside input of power pins 12, the feedback end of constant voltage loop unit 16 is connected with the inside link of feedback voltage pin 14, the output of constant voltage loop unit 16 is connected with the input of modulation circuit 17, the first input end of comparison circuit 19 is connected with the output of reference circuit 18, the second input of comparison circuit 19 is connected with the inside link of input pin 15, the output of comparison circuit 19 is connected with the control end of modulation circuit 17, and the output of modulation circuit 17 is connected with the inside link of direct current output pin 13.
Starting resistor inputs to constant voltage loop unit 16 by power pins 12, it is the power supply of Switching Power Supply control chip 1 internal module that constant voltage loop unit 16 is converted to internal supply voltage with the starting resistor of this high voltage direct current, modulation circuit 17 is low-voltage dc voltage with this voltage transitions further, export application circuit to by direct current output pin 13, input pin 15 is used for by the applications circuit output low-voltage dc voltage being sampled, and the reference voltage that sampled signal and modulation circuit 18 are provided relatively, to modulation circuit 17 output control signals, to come the amplitude of regulation output low-voltage dc voltage by the pulse duration of control modulation circuit, make it keep stable.Feedback voltage pin 14 is used for the auxiliary winding of feedback and senses and the proportional voltage feedback signal of system's output voltage.
Fig. 2 shows the application circuit of the Switching Power Supply control chip of existing five pin encapsulation, comprising:
Switching Power Supply control chip 1, current rectifying and wave filtering circuit 21, start-up circuit 22, switching circuit 23, transformer 24, feedback circuit 25 and filter circuit 26.
The input of current rectifying and wave filtering circuit 21 connects AC power, the output of current rectifying and wave filtering circuit 21 is connected with the input of start-up circuit 22, the output of start-up circuit 22 is connected with the outside link of the power pins 12 of Switching Power Supply control chip 1, the input of switching circuit 23 is connected with the outside link of Switching Power Supply control chip 1 direct current output pin 13, the sampling end of switching circuit 23 is connected with the outside link of the input pin 15 of Switching Power Supply control chip 1, the earth terminal of switching circuit 23 is connected with the outside link of the grounding pin of Switching Power Supply control chip 1, common ground, the output of switching circuit 23 is connected with the armature winding of transformer 24, the auxiliary winding of transformer 24 is connected with the input of feedback circuit 25, the output of feedback circuit 25 is connected with the outside link of the feedback voltage pin 14 of Switching Power Supply control chip 1, the secondary winding of transformer 24 is connected with the input of filter circuit 26, and the output of filter circuit 26 is the output of application circuit of the Switching Power Supply control chip 1 of this five pin encapsulation.
Alternating current is through becoming the direct current of concussion high pressure behind the current rectifying and wave filtering circuit 21, this high voltage direct current is by charging with starting switch power supply control chip 1 to start-up circuit 22, make the direct current output pin 13 output low-voltage DCs of described chip 1, this low-voltage DC is exported to the armature winding of transformer 24 by switch element 23, secondary winding by transformer 24 is passed to filter circuit 26 with this voltage, is carried out becoming behind the secondary filtering output voltage of this application circuit by 26 pairs of these low-voltage DCs of filter circuit.
Because the structure of five pins of above-mentioned Switching Power Supply control chip is so that this chip can only be selected the encapsulation of SOT23 formula at present, still, SOT23 formula packaging technology is complicated, and cost is high, is unfavorable for the extensive use of Switching Power Supply control chip.
Summary of the invention
For this reason, technical problem to be solved by this invention is: a kind of Switching Power Supply control chip and application circuit thereof are provided, and to overcome the deficiencies in the prior art, the facilitating chip packaging technology reduces manufacturing cost.
So, the invention provides a kind of Switching Power Supply control chip, comprise: the power pins that is used for input starting resistor and input chip exterior supply power voltage, the direct current output pin that is used for the output low-voltage dc voltage, the current signal that is used for the input current detection signal detects pin and grounding pin, comprise the constant voltage loop unit in this Switching Power Supply control chip inside, modulation circuit, reference circuit and comparison circuit, wherein the first input end of constant voltage loop unit is connected with the inside link of power pins, the second input is connected with reference circuit the first output, output is connected with the first input end of modulation circuit, the output of modulation circuit is connected with the inside link of electric current output pin, the second output output signal of reference circuit is connected with the first input end of comparison circuit, the second input of comparison circuit is connected with the inside link that current signal detects pin, and comparison circuit outputs signal to modulation circuit.
Wherein, described chip adopts the encapsulation of TO-92 formula four pin.
The first input end IN1 of described constant voltage loop unit is by resistance R 62 and resistance R 61 ground connection of series connection, the second input IN2 is connected with the inverting input of operational amplifier, output OUT is connected with the output of operational amplifier, and the in-phase input end of operational amplifier is connected between resistance R 62 and the resistance R 61.
Described comparison circuit is a voltage comparator.
The present invention also provides a kind of application circuit that uses said chip, and this circuit comprises: current rectifying and wave filtering circuit, the filter capacitor C1 that is connected with rectification filter circuit output end, and the other end ground connection of this filter capacitor C1, and
Start-up circuit, the input of described start-up circuit is connected with rectification filter circuit output end, the end of filter capacitor C1 is connected between start-up circuit and the current rectifying and wave filtering circuit, the output of described start-up circuit is connected with the bringing-out of the power pins of the described chip of claim 1, be used for when power supply electrifying, charging, to described chip output starting resistor;
Switching circuit, the first input end of described switching circuit is connected with the outside link of the direct current output pin of the described chip of claim 1, the second input of switching circuit is connected with the outside link that the current signal of the described chip of claim 1 detects pin, the outside link common ground of the grounding pin of the earth terminal of switching circuit and the described chip of claim 1, be used for conducting when described chip is exported described low-voltage dc voltage, the output On current;
Transformer T1, the Same Name of Ends of the armature winding N1 of this transformer T1 is connected with the input of described start-up circuit, the different name end of described armature winding N1 is connected with the output of described switching circuit, the Same Name of Ends of the secondary winding N2 of this transformer T1 is the output negative pole of described application circuit, the different name end of the secondary winding N2 of this transformer T1 is connected with the input of filter circuit, and the Same Name of Ends of the compole winding N3 of this transformer T1 is connected with the grounding pin of the described chip of claim 1;
Diode D6, the anode of this diode D6 is connected with the different name end of the auxiliary winding N3 of described transformer T1, and negative electrode is connected with the bringing-out of the power pins of the described chip of claim 1, and being used for provides supply power voltage and voltage feedback signal to described chip;
Filter circuit, the positive input terminal of this filter circuit is connected with the different name end of the secondary winding N2 of described transformer T1, the negative input end of described filter circuit is connected with the Same Name of Ends of the secondary winding N2 of described transformer T1, the positive output end of this filter circuit is the output cathode of described application circuit, the negative output terminal of this filter circuit is the output negative pole of described application circuit, for reducing the ripple in the low-voltage dc voltage of sensing.
Wherein, described start-up circuit comprises:
Wherein, described switching circuit comprises:
Triode Q1 and resistance R 3, the base stage of triode Q1 is the input of described switching circuit, the output of the very described switching circuit of the current collection of triode Q1, the emitter of triode Q1 is connected with an end of resistance R 3, and the other end of resistance R 3 is the earth terminal of described switching circuit.
Wherein, described filter circuit comprises:
Diode D7, capacitor C 4 and resistance R 4, capacitor C 4 is in parallel with resistance R 4, capacitor C 4 is negative input end and the negative output terminal of described filter circuit with a common port of resistance R 4 simultaneously, capacitor C 4 is the positive output end of described filter circuit with another common port of resistance R 4, the negative electrode of diode D7 is connected on the positive output end of this filter circuit, and the anode of diode D7 is connected with the different name end of transformer T1 secondary winding N2.
Above-mentioned application circuit also comprises:
Absorbing circuit, the input of described absorbing circuit is connected with the different name end of the armature winding N1 of transformer T1, and the output of this absorbing circuit is connected with the Same Name of Ends of the armature winding N1 of transformer T1, is used for absorbing leakage inductance current spike voltage.
Wherein, described absorbing circuit comprises:
Diode D5, capacitor C 2 and resistance R 2, resistance R 2 is in parallel with capacitor C 3, resistance R 2 is the output of described absorbing circuit with a common port of capacitor C 3, and another common port is connected with the negative electrode of diode D5, and the anode of diode D5 is the input of described absorbing circuit.
In embodiments of the present invention, by changing Switching Power Supply control chip internal module structure and applications circuit, can realize that alternating current arrives galvanic conversion so that only detect pin by power pins, grounding pin, direct current output pin and current signal, effectively reduce cost of manufacture, and this structure is applicable to the encapsulation of TO92 formula, further simplify packaging technology, be conducive to the extensive use of Switching Power Supply control chip.
Description of drawings
Fig. 1 is the structure chart of the Switching Power Supply control chip of existing five pin encapsulation;
Fig. 2 is the structure chart of application circuit of the Switching Power Supply control chip of existing five pin encapsulation;
The structure chart of the Switching Power Supply control chip that Fig. 3 provides for one embodiment of the invention;
The structure chart of the application circuit of the Switching Power Supply control chip that Fig. 4 provides for one embodiment of the invention;
The exemplary circuit structure chart of the application circuit of the Switching Power Supply control chip that Fig. 5 provides for one embodiment of the invention;
Fig. 6 is the particular circuit configurations of constant voltage loop unit in the described Switching Power Supply control chip of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the invention utilizes the constant voltage loop unit directly from power pins receiver voltage feedback signal, and the pin of Switching Power Supply control chip is reduced to four.
Fig. 3 illustrates the structure of the Switching Power Supply control chip that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
As the Switching Power Supply control chip 3 that one embodiment of the invention provides, comprise grounding pin 31, reference circuit 37 and modulation circuit 36 and constant voltage loop power 35, and four pins of this chip 3.
Wherein, power pins 32, the supply power voltage and the auxiliary winding that are used for the input chip exterior are sensed and the proportional voltage feedback signal of system's output voltage;
Direct current output pin 33 is used for the output low-voltage dc voltage;
Current signal detects pin 34, is used for to described Switching Power Supply control chip 3 input current detection signals;
The first input end of constant voltage loop unit 35 is connected with the inside link of power pins 32, the second input of constant voltage loop unit 35 is connected with the first output of reference circuit 37, the output of constant voltage loop unit 35 is connected with the first input end of modulation circuit 36, constant voltage loop unit 35 outputs one voltage feedback signal is to modulation circuit 36, modulation circuit 36 is adjusted himself operating state according to this voltage feedback signal, stable with the VD that guarantees the application circuit system.
The first input end of comparison circuit 38 is connected with the second output of reference circuit 37, the second input of comparison circuit 38 is connected with the inside link that current signal detects pin 34, the output of comparison circuit 38 is connected with the second input of modulation circuit 36, comparison circuit 38 is used for the reference voltage that current detection signal and reference circuit 37 provide is compared, and result of its comparison inputs to modulation circuit 36 by the output of comparison circuit 38.Described comparison circuit 38 is a voltage comparator.
As one embodiment of the invention, grounding pin 31 is drawn chip with the chip internal earth terminal, be connected with ground wire, behind the alternating voltage process rectifying and wave-filtering of input, form the high-voltage dc signal of concussion, this high-voltage dc signal is inputted by power pins 32 as the starting resistor of Switching Power Supply control chip 3, and Switching Power Supply control chip 3 is started working.
Constant voltage loop unit 35 detects the voltage feedback signal of power pins 32, and the voltage feedback signal of input is different, and constant voltage loop unit 35 can be exported different voltage, and different voltage control modulation circuits 36 are in different operating states.When voltage feedback signal in greater than constant voltage loop unit 35 during default magnitude of voltage, the higher voltage of constant voltage loop unit 35 outputs, make modulation circuit 36 reduce the duty ratio of modulation signal, and then reduce the amplitude of output dc voltage, when voltage feedback signal in less than constant voltage loop unit 35 during default magnitude of voltage, the lower voltage of constant voltage loop unit 35 outputs, make modulation circuit 36 increase the duty ratio of modulation signal, and then the amplitude of the direct voltage of increase application circuit system output, and then controlled the stable of application circuit system output dc voltage amplitude.
In embodiments of the present invention, the parameters such as the conversion efficiency of Switching Power Supply control chip and reliability can reach the technical indicator identical with the Switching Power Supply control chip of existing five pin SOT23 formulas encapsulation.
As one embodiment of the invention, Switching Power Supply control chip 3 can adopt the encapsulation of transistor T O92 formula.
In embodiments of the present invention, utilize the constant voltage loop unit directly from power pins receiver voltage feedback signal, the pin of Switching Power Supply control chip is reduced to four, effectively reduce cost of manufacture, and this structure is applicable to the encapsulation of TO92 formula, further simplify packaging technology, reduced packaging cost, be conducive to the extensive use of Switching Power Supply control chip.
Fig. 4 illustrates the structure of the application circuit of the Switching Power Supply control chip that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
The application circuit 4 of this Switching Power Supply control chip can be used in charger, adapter, light fixture and the led drive circuit.
As one embodiment of the invention, the application circuit of Switching Power Supply control chip comprises rectification circuit 41, filter capacitor C1, diode D6, start-up circuit 42, transformer 44, filter circuit 46, switching circuit 43 and Switching Power Supply control chip 3.
Wherein, the input of start-up circuit 42 is connected with the end of filter capacitor C1, and capacitor C 1 also is connected with current rectifying and wave filtering circuit 41 with the link of start-up circuit 42, an other end ground connection of capacitor C 1.The output of start-up circuit 42 is connected with the bringing-out of power pins 32, is used for charging when power supply electrifying, to chip 3 output starting resistors;
The first input end of switching circuit 43 is connected with the outside link of direct current output pin 33, the second input of switching circuit 43 is connected with the bringing-out that current signal detects pin 34, the outside link common ground of the earth terminal of switching circuit 43 and grounding pin 31, be used for conducting when chip 3 output low-voltage dc voltage, the output On current;
The Same Name of Ends of the armature winding of transformer is connected with the input of start-up circuit 42, the different name end of armature winding N1 is connected with the output of switching circuit 43, the Same Name of Ends of the secondary winding N2 of transformer T1 is the output negative pole of the application circuit 4 of Switching Power Supply control chip, the different name end of the secondary winding N2 of transformer T1 is connected with the input of filter circuit 46, is used for On current is converted to output voltage;
The anode of diode D6 is connected with the different name end of the auxiliary winding N3 of described transformer T1, the negative electrode of described diode D6 is connected with the bringing-out of described power pins, and being used for provides supply power voltage and auxiliary winding to sense and the proportional voltage feedback signal of system's output voltage to described chip;
Below in conjunction with specific embodiment realization of the present invention is elaborated.
Fig. 5 illustrates the exemplary circuit structure of the application circuit of the Switching Power Supply control chip that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
As one embodiment of the invention, start-up circuit 42 comprises: resistance R 1 and capacitor C 3, and an end of resistance R 1 is the input of start-up circuit 42, the other end of resistance R 1 is connected with an end of capacitor C 3, its link is the output of start-up circuit 42, the other end ground connection of capacitor C 3.
The anode of diode D6 is connected with the different name end of the auxiliary winding N3 of described transformer T1, and the negative electrode of described diode D6 is connected with the bringing-out of described power pins, and being used for provides supply power voltage and voltage feedback signal to described chip.
Absorbing circuit 47, the input of absorbing circuit 47 is connected with the different name end of the armature winding N1 of transformer T1, and the output of absorbing circuit 47 is connected with the Same Name of Ends of the armature winding N1 of transformer T1, is used for absorbing leakage inductance current spike voltage.
This absorbing circuit 47 comprises: diode D5, capacitor C 2 and resistance R 2, resistance R 2 is in parallel with capacitor C 3, resistance R 2 is the output of absorbing circuit 47 with a common port of capacitor C 3, resistance R 2 is connected with the negative electrode of diode D5 with another common port of capacitor C 3, and the anode of diode D5 is the input of absorbing circuit 47.
Absorb the peak voltage that is produced by the Transformer Winding leakage inductance by absorptive unit, it is breakdown that switch element is difficult for, and increased the reliability of the application circuit of Switching Power Supply control chip.
In embodiments of the present invention, AC power becomes the high voltage direct current of concussion by 3 chargings of 1 pair of capacitor C of resistance R after through the rectification circuit 41 that is made of rectifier bridge and filter capacitor C1, when the voltage on the capacitor C 3 reaches the starting resistor of chip 3, chip 3 is started working, constant voltage loop unit 35 detects the voltage feedback signal of power pins 32, according to different voltage feedback signal control modulation circuits 36, make it work in different states, when voltage feedback signal in greater than constant voltage loop unit 35 during default magnitude of voltage preset value, the higher voltage of constant voltage loop unit 35 outputs, make modulation circuit unit 36 reduce the duty ratio of modulation signal, and then reduce the amplitude of output dc voltage, when voltage feedback signal in less than constant voltage loop unit 35 during default magnitude of voltage, the lower voltage of constant voltage loop unit 35 outputs, make modulation circuit 36 increase the duty ratio of modulation signal, and then increase the amplitude of the direct voltage of application circuit system output, and then stable with the direct voltage amplitude of having controlled the output of application circuit system.
Constant voltage loop unit 35 in the described Switching Power Supply control chip 3 of above-described embodiment, its particular circuit configurations figure as shown in Figure 6, this figure only provides a kind of particular circuit configurations, is described in detail as case.As shown in Figure 6, the first input end IN1 of constant voltage loop unit 35 is by resistance R 62 and resistance R 61 ground connection of series connection, the second input IN2 is connected with the inverting input of operational amplifier A MP, output OUT is connected with the output of operational amplifier A MP, and the in-phase input end of operational amplifier A MP is connected between resistance R 62 and the resistance R 61.That is: constant voltage loop unit 35 first input ends are IN1, and the second input is IN2, and output is OUT.AMP is operational amplifier, when higher than input IN2 voltage after input IN1 voltage is through resistance R 61 and resistance R 62 dividing potential drops, the higher voltage of constant voltage loop unit 35 outputs, when lower than input IN2 voltage after input IN1 voltage is through resistance R 61 and resistance R 62 dividing potential drops, the lower voltage of constant voltage loop unit 35 outputs.
In embodiments of the present invention, by changing Switching Power Supply control chip internal module structure and applications circuit, can realize that alternating current arrives galvanic conversion so that only detect pin by power pins, grounding pin, direct current output pin and current signal, effectively reduce cost of manufacture, and this structure is applicable to the encapsulation of TO92 formula, further simplify packaging technology, be conducive to the extensive use of Switching Power Supply control chip.
In embodiments of the present invention, utilize the constant voltage loop unit directly from power pins receiver voltage feedback signal, the pin of Switching Power Supply control chip is reduced to four, and by changing its applications circuit, so that only pass through power pins, grounding pin, direct current output pin and current signal detect pin can realize that alternating current arrives galvanic conversion, effectively reduce cost of manufacture, simplified packaging technology, be conducive to the extensive use of Switching Power Supply control chip, absorb peak voltage by increasing absorptive unit in addition, increased the reliability of the application circuit of Switching Power Supply control chip.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. Switching Power Supply control chip, it is characterized in that, comprise: the power pins that is used for input starting resistor and input chip exterior supply power voltage, the direct current output pin that is used for the output low-voltage dc voltage, the current signal that is used for the input current detection signal detects pin and grounding pin, comprise the constant voltage loop unit in this Switching Power Supply control chip inside, modulation circuit, reference circuit and comparison circuit, wherein the first input end of constant voltage loop unit is connected with the inside link of power pins, the second input is connected with reference circuit the first output, output is connected with the first input end of modulation circuit, the output of modulation circuit is connected with the inside link of electric current output pin, the second output output signal of reference circuit is connected with the first input end of comparison circuit, the second input of comparison circuit is connected with the inside link that current signal detects pin, and comparison circuit outputs signal to modulation circuit.
2. Switching Power Supply control chip according to claim 1 is characterized in that, described chip adopts the encapsulation of TO-92 formula four pin.
3. Switching Power Supply control chip according to claim 1, it is characterized in that, the first input end IN1 of described constant voltage loop unit is by resistance R 62 and resistance R 61 ground connection of series connection, the second input IN2 is connected with the inverting input of operational amplifier, output OUT is connected with the output of operational amplifier, and the in-phase input end of operational amplifier is connected between resistance R 62 and the resistance R 61.
4. according to claim 1 to 3 described Switching Power Supply control chips, it is characterized in that described comparison circuit is a voltage comparator.
5. one kind is used the as claimed in claim 1 application circuit of chip, it is characterized in that, comprising: current rectifying and wave filtering circuit, the filter capacitor C1 that is connected with rectification filter circuit output end, and the other end ground connection of this filter capacitor C1, and
Start-up circuit, the input of described start-up circuit is connected with rectification filter circuit output end, the end of filter capacitor C1 is connected between start-up circuit and the current rectifying and wave filtering circuit, the output of described start-up circuit is connected with the bringing-out of the power pins of the described chip of claim 1, be used for when power supply electrifying, charging, to described chip output starting resistor;
Switching circuit, the first input end of described switching circuit is connected with the outside link of the direct current output pin of the described chip of claim 1, the second input of switching circuit is connected with the outside link that the current signal of the described chip of claim 1 detects pin, the outside link common ground of the grounding pin of the earth terminal of switching circuit and the described chip of claim 1, be used for conducting when described chip is exported described low-voltage dc voltage, the output On current;
Transformer T1, the Same Name of Ends of the armature winding N1 of this transformer T1 is connected with the input of described start-up circuit, the different name end of described armature winding N1 is connected with the output of described switching circuit, the Same Name of Ends of the secondary winding N2 of this transformer T1 is the output negative pole of described application circuit, the different name end of the secondary winding N2 of this transformer T1 is connected with the input of filter circuit, and the Same Name of Ends of the compole winding N3 of this transformer T1 is connected with the grounding pin of the described chip of claim 1;
Diode D6, the anode of this diode D6 is connected with the different name end of the auxiliary winding N3 of described transformer T1, and negative electrode is connected with the bringing-out of the power pins of the described chip of claim 1, and being used for provides supply power voltage and voltage feedback signal to described chip;
Filter circuit, the positive input terminal of this filter circuit is connected with the different name end of the secondary winding N2 of described transformer T1, the negative input end of described filter circuit is connected with the Same Name of Ends of the secondary winding N2 of described transformer T1, the positive output end of this filter circuit is the output cathode of described application circuit, the negative output terminal of this filter circuit is the output negative pole of described application circuit, for reducing the ripple in the low-voltage dc voltage of sensing.
6. application circuit according to claim 5 is characterized in that, described start-up circuit comprises:
Resistance R 1 and capacitor C 3, an end of resistance R 1 is the input of described start-up circuit, and the other end of resistance R 1 is connected with an end of capacitor C 3, and its link is the output of described start-up circuit, the other end ground connection of capacitor C 3.
7. application circuit according to claim 5 is characterized in that, described switching circuit comprises:
Triode Q1 and resistance R 3, the base stage of triode Q1 is the input of described switching circuit, the output of the very described switching circuit of the current collection of triode Q1, the emitter of triode Q1 is connected with an end of resistance R 3, and the other end of resistance R 3 is the earth terminal of described switching circuit.
8. application circuit according to claim 5 is characterized in that, described filter circuit comprises:
Diode D7, capacitor C 4 and resistance R 4, capacitor C 4 is in parallel with resistance R 4, capacitor C 4 is negative input end and the negative output terminal of described filter circuit with a common port of resistance R 4 simultaneously, capacitor C 4 is the positive output end of described filter circuit with another common port of resistance R 4, the negative electrode of diode D7 is connected on the positive output end of this filter circuit, and the anode of diode D7 is connected with the different name end of transformer T1 secondary winding N2.
9. application circuit according to claim 5 is characterized in that, also comprises:
Absorbing circuit, the input of described absorbing circuit is connected with the different name end of the armature winding N1 of transformer T1, and the output of this absorbing circuit is connected with the Same Name of Ends of the armature winding N1 of transformer T1, is used for absorbing leakage inductance current spike voltage.
10. application circuit according to claim 9 is characterized in that, described absorbing circuit comprises:
Diode D5, capacitor C 2 and resistance R 2, resistance R 2 is in parallel with capacitor C 3, resistance R 2 is the output of described absorbing circuit with a common port of capacitor C 3, and another common port is connected with the negative electrode of diode D5, and the anode of diode D5 is the input of described absorbing circuit.
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| CN2012105198132A CN102969910A (en) | 2012-12-06 | 2012-12-06 | Switching power supply control chip and application circuit thereof |
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| CN2012105198132A CN102969910A (en) | 2012-12-06 | 2012-12-06 | Switching power supply control chip and application circuit thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108183466A (en) * | 2017-12-26 | 2018-06-19 | 成都鼎信致远科技有限公司 | Direct current window type work high temperature pulse power supply |
| CN111271271A (en) * | 2018-12-05 | 2020-06-12 | 银隆新能源股份有限公司 | Detection device and detection system |
| CN111682772A (en) * | 2020-04-02 | 2020-09-18 | 上海航天控制技术研究所 | Multi-output switch power supply device of high-voltage servo controller |
| CN116260341A (en) * | 2023-02-22 | 2023-06-13 | 华南师范大学 | Bias power supply device for single photon detector and control method thereof |
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