CN104716820A - Soft start and direct-current voltage conversion circuit and electronic device - Google Patents
Soft start and direct-current voltage conversion circuit and electronic device Download PDFInfo
- Publication number
- CN104716820A CN104716820A CN201310674672.6A CN201310674672A CN104716820A CN 104716820 A CN104716820 A CN 104716820A CN 201310674672 A CN201310674672 A CN 201310674672A CN 104716820 A CN104716820 A CN 104716820A
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- Prior art keywords
- resistance
- connects
- operational amplifier
- pin
- electric capacity
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a soft start circuit. One end of a first resistor is connected with the positive pole of a direct-current power supply, the other end of the first resistor is connected with a positive input end of an operational amplifier, one end of a second resistor is grounded, the other end of the second resistor is connected with the positive input end of an operational amplifier, one end of a third resistor is connected with the direct-current power supply, the other end of the third resistor is connected with a negative input end of the operational amplifier, the negative pole of a first diode is connected with the positive pole of the direct-current power supply, the positive pole of the first diode is connected with the negative input end of the operational amplifier, a first capacitor is connected between the negative input end and the output end of the operational amplifier in a bridging mode, the negative input end of the operational amplifier is grounded through a second capacitor, the positive pole of a second diode is connected with the output end of the operational amplifier, and the negative pole of the second diode is connected with an enabling pin of a buck converter chip. The invention further discloses a direct-current voltage conversion circuit and an electronic device. By means of the soft start circuit, the direct-current voltage conversion circuit and the electronic device, reliability is high, and deadlock and spurious triggering are avoided.
Description
Technical field
The present invention relates to circuit field, particularly relate to a kind of soft starting circuit and DC voltage conversion circuit and electronic equipment.
Background technology
Switching Power Supply at present in the electronic equipment of industry-by-industry generally adopts Buck buck converter, in the integrated chip of buck converter, some uses outside pin to set soft starting time, and some inside secures soft-start time, eliminates external pin to reduce costs.
Find in the application of some reality, electric charge have the chip of outside soft start pin sometimes because can not bleed off by inner soft start electric capacity in time, or power output end is connected with bulky capacitor, current foldback circuit action when causing system reboot is also locked, power supply cisco unity malfunction; Those chips with fixing soft starting time but can not meet the requirement of some application sometimes.As in some industrial medical electrical application, some voltage requires very long soft start time delay in power up; In automobile electronic system, output voltage needs the electric capacity of a very high capacity, thus when power supply power-fail or motor throw load time, guarantee system can continue one and hold time, these application have bulky capacitor owing to exporting, if soft starting time is inadequate, will have problems in the starting of system, reliability is not high.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of soft start, DC voltage conversion circuit and electronic equipment.The deficiency that the reliability of soft starting circuit in prior art is not high can be solved.
In order to solve the problems of the technologies described above, the invention provides a kind of soft starting circuit, comprising:
First resistance, the second resistance, the 3rd resistance, the first electric capacity, the second electric capacity, the first diode, the second diode and operational amplifier, wherein, one end of described first resistance connects the positive pole of DC power supply, and the other end of described first resistance connects the positive input terminal of described operational amplifier;
One end ground connection of described second resistance, the other end of described second resistance connects the positive input terminal of described operational amplifier;
One end of described 3rd resistance connects described DC power supply, the other end of described 3rd resistance connects the negative input end of described operational amplifier, the negative electrode of described first diode connects the positive pole of described DC power supply, and the anode of described first diode connects the negative input end of described operational amplifier;
Between the negative input end that described first electric capacity is connected across described operational amplifier and output, the negative input end of described operational amplifier is by described second capacity earth;
The anode of described second diode connects the output of described operational amplifier, and the negative electrode of described second diode connects the enable pin of decompression transformation chip.
Wherein, the components and parts in described soft starting circuit are surface mount elements.
Wherein, the components and parts in described software startup circuit are coated with three anti-paints.
Accordingly, the invention provides a kind of DC voltage conversion circuit, comprise above-mentioned soft starting circuit.
Wherein, also comprise voltage conversion circuit, described voltage conversion circuit comprises decompression transformation chip, the 4th circuit, the 5th resistance, the 6th resistance, the 4th electric capacity, the 5th electric capacity and inductance, wherein, the voltage input pin of described decompression transformation chip connects DC power supply, the enable pin of described decompression transformation chip connects described soft starting circuit, and the comparison pin of described decompression transformation chip is by described 3rd resistance and the 3rd capacity earth;
The signal ground pin ground connection of described decompression transformation chip, described signal ground pin connects the feedback pin of described decompression transformation chip by described 5th resistance, described feedback pin is connected with the pulse-width modulation pin of described inductance with described decompression transformation chip by described 4th electric capacity, and described 6th resistance is connected across the two ends of described 4th electric capacity;
The pulsewidth that one end of described 5th electric capacity connects described decompression transformation chip by described inductance regulates and guides pin, and the other end of described 5th torch connects power supply ground pin and the ground connection of described decompression transformation chip respectively.
Wherein, described 5th electric capacity is polar capacitor, and wherein, the pulsewidth that the positive pole of described 5th electric capacity connects described decompression transformation chip by described inductance regulates and guides pin, and the negative pole of described 5th torch connects power supply ground pin and the ground connection of described decompression transformation chip respectively.
Wherein, the output voltage range of described DC power supply is 4.5V-16V.
Wherein, the packing forms of described decompression transformation chip is small-sized package.
Wherein, the components and parts in described translation circuit are surface mount elements and components and parts are coated with three anti-paints.
Accordingly, the invention provides a kind of electronic equipment, comprise above-mentioned DC voltage conversion circuit
Implement the present invention, there is following beneficial effect:
The soft starting circuit consisted of operational amplifier is connected to the soft start pin of decompression transformation chip, realizes the soft start function when Switching Power Supply is restarted large with load variations, high compared to the soft starting circuit reliability of prior art.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The circuit diagram of a kind of soft starting circuit of Fig. 1 embodiment of the present invention;
Fig. 2 is the circuit diagram of a kind of DC voltage converting circuit of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, for the circuit diagram of a kind of soft starting circuit of the embodiment of the present invention, in the present embodiment, described soft starting circuit comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the first electric capacity C1, the second electric capacity C2, the first diode D1, the second diode D2 and operational amplifier U1
The annexation of above-mentioned components and parts is: one end of the first resistance R1 connects the positive pole of DC power supply VCC, the minus earth of DC power supply VCC, the positive input terminal of the other end concatenation operation amplifier U1 of the first resistance R1; One end ground connection of the second resistance R2, the positive input terminal of the other end concatenation operation amplifier U1 of the second resistance R2; One end of 3rd resistance R3 connects the positive pole of DC power supply VCC, the negative input end of the other end concatenation operation amplifier U1 of the 3rd resistance R3, the negative electrode of the first diode D1 connects the positive pole of DC power supply VCC, the negative input end of the anode concatenation operation amplifier U1 of the first diode D1; Between the negative input end that first electric capacity C1 is connected across operational amplifier U1 and output, the negative input end of operational amplifier U1 is by the second electric capacity C2 ground connection; The output of the anode concatenation operation amplifier U1 of the second diode D2, the negative electrode of the second diode D2 connects the enable pin EN of decompression transformation chip.
Optionally, the components and parts in soft starting circuit are surface mount elements, are convenient to realize automation and generate, improve formation efficiency.
Optionally, the components and parts in soft starting circuit are coated with three anti-paints, to make this soft starting circuit normally can work in dust, humidity and the adverse circumstances vibrated, improve the reliability of circuit.
The operation principle of this soft starting circuit is: the soft starting circuit based on operational amplifier U1 can provide soft startup protection function under various conditions.DC power supply VCC is connected to the positive input terminal of operational amplifier U1 by the resistance pressure-dividing network that the first resistance R1 and the second resistance R2 forms; Meanwhile, DC power supply VCC is connected to the negative input end of operational amplifier by the RC circuit that the 3rd resistance R3 and the second electric capacity C2 forms.When circuit powers on, the negative input end of operational amplifier U1 is due to the impact of capacitor charging transient short-circuit, the voltage of its positive input terminal will be greater than the voltage of negative input end, now operational amplifier U1 exports high level, high level is added on the soft start pin EN of decompression transformation chip by the second diode D2, and the voltage of soft start pin EN is low-voltage, in the end of oppisite phase capacitor charging process of operational amplifier U1, the voltage of soft start pin EN keeps lower numerical value always, achieves soft start function.The voltage of DC power supply continues to raise, and the second electric capacity C2 continues charging, and the negative input end terminal voltage of operational amplifier U1 rises, the voltage of negative input end will be greater than the voltage of positive input terminal, operational amplifier U1 output low level, the second diode D2 reverse bias, now circuit no longer works.
When soft starting circuit output short-circuit, the first diode D1 be connected in parallel on the 3rd resistance R3 discharges to the second electric capacity C2, thus prepares for soft start next time after resetting.
Implement the present invention, the soft starting circuit consisted of operational amplifier is connected to the soft start pin of decompression transformation chip, realizes the soft start function when Switching Power Supply is restarted large with load variations, high compared to the soft starting circuit reliability of prior art.
See Fig. 2, for the circuit diagram of a kind of DC voltage conversion circuit of the embodiment of the present invention, in the present embodiment, described translation circuit comprises soft starting circuit and voltage conversion circuit, and voltage conversion circuit comprises decompression transformation chip U2, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 4th electric capacity C4, the 5th electric capacity C5 and inductance L 1.
The annexation of above-mentioned components and parts is: the voltage input pin Vin of decompression transformation chip U2 connects the positive pole of DC power supply VCC, the minus earth of DC power supply VCC; The enable pin EN of decompression transformation chip U2 connects the negative electrode of the second diode D2 in soft starting circuit, and the comparison pin COMP of decompression transformation chip U2 is by the 3rd resistance R3 and the 3rd electric capacity C3 ground connection;
The signal ground pin AGND ground connection of decompression transformation chip U2, signal ground pin AGND connects the feedback pin FB of decompression transformation chip U2 by the 5th resistance R5, feedback pin FB is connected with the pulse-width modulation pin LX of decompression transformation chip U2 with inductance L 1 by the 4th electric capacity C4, and the 6th resistance R6 is connected across the two ends of the 4th electric capacity C4;
One end of 5th electric capacity C5 connects the pulse-width modulation pin LX of decompression transformation chip U2 by inductance L 1, the other end of described 5th electric capacity C5 connects power supply ground pin PGND and the ground connection of decompression transformation chip U2 respectively.
Optionally, the 5th electric capacity C5 is polar capacitor, and the positive pole of the 5th electric capacity C5 connects the pulse-width modulation pin LX of decompression transformation chip U2 by inductance L 1, and the negative pole of the 5th electric capacity C5 connects power supply ground pin PGND and the ground connection of decompression transformation chip U2 respectively.Polar capacitor can avoid output voltage reverse, protection subsequent conditioning circuit.
Optionally, the output voltage range of DC power supply VCC is 4.5V-16V.
Optionally, the packing forms of decompression transformation chip U2 is small-sized package.
Optionally, the components and parts in translation circuit are surface mount elements and components and parts are coated with three anti-paints.Be convenient to realize automation generate, improve formation efficiency.Normally can work in dust, humidity and the adverse circumstances vibrated simultaneously, improve the reliability of circuit.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly the interest field of the present invention can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that the claims in the present invention are done, still belong to the scope that invention is contained.
Claims (10)
1. a soft starting circuit, it is characterized in that, comprise the first resistance, the second resistance, the 3rd resistance, the first electric capacity, the second electric capacity, the first diode, the second diode and operational amplifier, wherein, one end of described first resistance connects the positive pole of DC power supply, and the other end of described first resistance connects the positive input terminal of described operational amplifier;
One end ground connection of described second resistance, the other end of described second resistance connects the positive input terminal of described operational amplifier;
One end of described 3rd resistance connects described DC power supply, the other end of described 3rd resistance connects the negative input end of described operational amplifier, the negative electrode of described first diode connects the positive pole of described DC power supply, and the anode of described first diode connects the negative input end of described operational amplifier;
Between the negative input end that described first electric capacity is connected across described operational amplifier and output, the negative input end of described operational amplifier is by described second capacity earth;
The anode of described second diode connects the output of described operational amplifier, and the negative electrode of described second diode connects the enable pin of decompression transformation chip.
2. soft starting circuit as claimed in claim 1, it is characterized in that, the components and parts in described soft starting circuit are surface mount elements.
3. soft starting circuit as claimed in claim 2, it is characterized in that, the components and parts in described software startup circuit are coated with three anti-paints.
4. a DC voltage conversion circuit, its feature exists, and comprises the soft starting circuit as described in claim 1-3 any one.
5. translation circuit as claimed in claim 4, it is characterized in that, also comprise voltage conversion circuit, described voltage conversion circuit comprises decompression transformation chip, the 4th resistance, the 5th resistance, the 6th resistance, the 4th electric capacity, the 5th electric capacity and inductance, wherein, the voltage input pin of described decompression transformation chip connects DC power supply, and the enable pin of described decompression transformation chip connects described soft starting circuit, and the comparison pin of described decompression transformation chip is by described 3rd resistance and the 3rd capacity earth;
The signal ground pin ground connection of described decompression transformation chip, described signal ground pin connects the feedback pin of described decompression transformation chip by described 5th resistance, described feedback pin is connected with the pulse-width modulation pin of described inductance with described decompression transformation chip by described 4th electric capacity, and described 6th resistance is connected across the two ends of described 4th electric capacity;
The pulsewidth that one end of described 5th electric capacity connects described decompression transformation chip by described inductance regulates and guides pin, and the other end of described 5th torch connects power supply ground pin and the ground connection of described decompression transformation chip respectively.
6. translation circuit as claimed in claim 5, it is characterized in that, described 5th electric capacity is polar capacitor, wherein, the positive pole of described 5th electric capacity connects the pulse-width modulation pin of described decompression transformation chip by described inductance, the negative pole of described 5th torch connects power supply ground pin and the ground connection of described decompression transformation chip respectively.
7. translation circuit as claimed in claim 6, the output voltage range of described DC power supply is 4.5V-16V.
8. translation circuit as claimed in claim 7, it is characterized in that, the packing forms of described decompression transformation chip is small-sized package.
9. translation circuit as claimed in claim 8, it is characterized in that, the components and parts in described translation circuit are surface mount elements and components and parts are coated with three anti-paints.
10. an electronic equipment, is characterized in that, comprises, as any one translation circuit of claim 4-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310674672.6A CN104716820A (en) | 2013-12-11 | 2013-12-11 | Soft start and direct-current voltage conversion circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310674672.6A CN104716820A (en) | 2013-12-11 | 2013-12-11 | Soft start and direct-current voltage conversion circuit and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104716820A true CN104716820A (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310674672.6A Pending CN104716820A (en) | 2013-12-11 | 2013-12-11 | Soft start and direct-current voltage conversion circuit and electronic device |
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| Country | Link |
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| CN (1) | CN104716820A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106412724A (en) * | 2016-09-06 | 2017-02-15 | 广州市婵昕生物科技有限责任公司 | DTU wireless terminal device for communication network engineering |
| CN108155882A (en) * | 2016-12-06 | 2018-06-12 | 瑞昱半导体股份有限公司 | Operational amplifier and its differential amplifier circuit |
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| CN108155882B (en) * | 2016-12-06 | 2021-04-20 | 瑞昱半导体股份有限公司 | Operational amplifier and differential amplification circuit thereof |
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Application publication date: 20150617 |