CN203180783U - Boosted circuit - Google Patents
Boosted circuit Download PDFInfo
- Publication number
- CN203180783U CN203180783U CN 201320184732 CN201320184732U CN203180783U CN 203180783 U CN203180783 U CN 203180783U CN 201320184732 CN201320184732 CN 201320184732 CN 201320184732 U CN201320184732 U CN 201320184732U CN 203180783 U CN203180783 U CN 203180783U
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- Prior art keywords
- switching tube
- circuit
- operational amplifier
- capacitor
- booster circuit
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Abstract
This utility model belongs to the control circuit field and particularly relates to a boosted circuit. In this utility model, the boosted circuit consists of discrete components including an inductor L, a Schottky diode D1,a sampling resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a voltage-regulator tube ZD1, an operational amplifier U1and a switch tube. Overlarge current passing through the circuit arises when unforeseen circumstances such as load short circuit and overload occur. Thus, voltage on the two ends of the sampling resistor R1 is increased. Therefore, operational amplifier U1 outputs control signals and a protection control circuit controls the switch tube to be disconnected. Then the boosted circuit stops operating. As a result, the boosted circuit is prevented from being damaged. The overcurrent protection circuit employed by the boosted circuit has a small size and low cost.
Description
Technical field
The utility model belongs to the control circuit field, relates in particular to a kind of booster circuit.
Background technology
Booster circuit is applied in all trades and professions as common power set, is used for driving various loaded work pieces.
When fortuitous events such as short circuit, overload appear in the load of booster circuit; can cause that the electric current that flows through the boost circuit switch pipe is excessive; make the pipe power consumption increase, generate heat; if there is not overcurrent protective device; high-power switch tube just may damage; the overcurrent protection of a lot of electric products in the market generally waits to detect and compare by sample resistance or Hall element, thereby realizes protection, but they have the big and high shortcoming of cost of volume.
The utility model content
The purpose of the utility model embodiment is to provide a kind of booster circuit, is intended to solve the current foldback circuit that present booster circuit adopts and has the big and high problem of cost of volume.
The utility model embodiment is achieved in that a kind of booster circuit, connects the protection control circuit, and described booster circuit comprises:
Inductance L, Schottky diode D1, sampling resistor R1, resistance R 2, resistance R 3, capacitor C 1, capacitor C 2, voltage-stabiliser tube ZD1, operational amplifier U1 and switching tube;
First end of described inductance L is input; the anode of the described Schottky diode D1 of second termination of described inductance L; the negative electrode of described Schottky diode D1 is output; described capacitor C 2 is connected between the negative electrode and ground of described Schottky diode D1; second end of the high potential termination inductance L of described switching tube; described control end of switching tube connects the output of protection control circuit; the cold end of described switching tube is by sampling resistor R1 ground connection; the in-phase input end of described operational amplifier U1 connects the cold end of described switching tube by resistance R 3; the input of the output termination protection control circuit of described operational amplifier U1; the negative electrode of described voltage-stabiliser tube ZD1 connects inverting input and the power supply of operational amplifier U1 simultaneously; the plus earth of described voltage-stabiliser tube ZD1 is between described resistance R 2 and capacitor C 1 parallel connection power supply and the ground.
In the utility model embodiment; booster circuit adopts common discrete component to constitute; inductance L; Schottky diode D1; sampling resistor R1; resistance R 2; resistance R 3; capacitor C 1; capacitor C 2; voltage-stabiliser tube ZD1; operational amplifier U1 and switching tube constitute booster circuit; when load short circuits occurring; during fortuitous events such as overload; can cause that the electric current that flows through circuit is excessive; the voltage at sampling resistor R1 two ends raises; cause operational amplifier U1 output control signal; protection control circuit control switch pipe disconnects; booster circuit quits work; thereby avoid booster circuit to be damaged, the current foldback circuit volume that this booster circuit adopts is little and cost is low.
Description of drawings
Fig. 1 is the circuit structure diagram of the booster circuit that provides of the utility model first embodiment;
Fig. 2 is the circuit structure diagram of the booster circuit that provides of the utility model second embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 1 shows the circuit structure of the booster circuit that the utility model first embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment, and details are as follows.
A kind of booster circuit connects the protection control circuit, and described booster circuit comprises:
Inductance L, Schottky diode D1, sampling resistor R1, resistance R 2, resistance R 3, capacitor C 1, capacitor C 2, voltage-stabiliser tube ZD1, operational amplifier U1 and switching tube 100;
First end of described inductance L is input; the anode of the described Schottky diode D1 of second termination of described inductance L; the negative electrode of described Schottky diode D1 is output; described capacitor C 2 is connected between the negative electrode and ground of described Schottky diode D1; second end of the high potential termination inductance L of described switching tube 100; the output of the control termination protection control circuit of described switching tube 100; the cold end of described switching tube 100 is by sampling resistor R1 ground connection; the in-phase input end of described operational amplifier U1 connects the cold end of described switching tube 100 by resistance R 3; the input of the output termination protection control circuit of described operational amplifier U1; the negative electrode of described voltage-stabiliser tube ZD1 connects inverting input and the power supply of operational amplifier U1 simultaneously; the plus earth of described voltage-stabiliser tube ZD1 is between described resistance R 2 and capacitor C 1 parallel connection power supply and the ground.
As the utility model one embodiment, described switching tube 100 adopts NPN type triode Q1, the base stage of described NPN type triode Q1 is the control end of switching tube 100, the current collection of described NPN type triode Q1 is the hot end of switching tube 100 very, and the emission of described NPN type triode Q1 is the cold end of switching tube 100 very.
Fig. 2 shows the circuit structure of the booster circuit that the utility model second embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment, and details are as follows.
As the utility model one embodiment, described switching tube 100 adopts N-type metal-oxide-semiconductor Q2, the grid of described N-type metal-oxide-semiconductor Q2 is the control end of switching tube 100, and the drain electrode of described N-type metal-oxide-semiconductor Q2 is the hot end of switching tube 100, and the source electrode of described N-type metal-oxide-semiconductor Q2 is the cold end of switching tube 100.
Adopting N-type metal-oxide-semiconductor Q2 with switching tube 100 below is the operation principle of the booster circuit of example explanation LED light fixture:
Inductance L, Schottky diode D1, N-type metal-oxide-semiconductor Q2 form the booster circuit of BOOST; the magnitude of voltage at sampling resistor R1 two ends exports the in-phase input end of operational amplifier U1 to; compare with the reference voltage Vf of the inverting input setting of operational amplifier U1; in-phase input end as operational amplifier U1 is higher than Vf; then operational amplifier U1 output high level is given the protection control circuit, stops PWM output, and N-type metal-oxide-semiconductor Q2 disconnects; no current passes through, and arrives the protection purpose.
By the resistance of sampling resistor R1 is set, make the crest voltage that produces through N-type metal-oxide-semiconductor Q2 peak inrush current also little by 30% than the Vf value, guarantee the misoperation of protection portion.So during operate as normal, protective circuit is inoperative.When the magnitude of voltage that has only the electric current on flowing through sampling resistor R1 to produce surpasses Vf=Ic*R1; the output output high level of operational amplifier U1 stops PWM output to protecting control circuit, and N-type metal-oxide-semiconductor Q2 disconnects; no current passes through, the danger of having protected circuit to burn because of overcurrent.
In the utility model embodiment; booster circuit adopts common discrete component to constitute; inductance L; Schottky diode D1; sampling resistor R1; resistance R 2; resistance R 3; capacitor C 1; capacitor C 2; voltage-stabiliser tube ZD1; operational amplifier U1 and switching tube constitute booster circuit; when load short circuits occurring; during fortuitous events such as overload; can cause that the electric current that flows through circuit is excessive; the voltage at sampling resistor R1 two ends raises; cause operational amplifier U1 output control signal; protection control circuit control switch pipe disconnects; booster circuit quits work; thereby avoid booster circuit to be damaged, the current foldback circuit volume that this booster circuit adopts is little and cost is low.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (3)
1. a booster circuit connects the protection control circuit, it is characterized in that, described booster circuit comprises:
Inductance L, Schottky diode D1, sampling resistor R1, resistance R 2, resistance R 3, capacitor C 1, capacitor C 2, voltage-stabiliser tube ZD1, operational amplifier U1 and switching tube;
First end of described inductance L is input; the anode of the described Schottky diode D1 of second termination of described inductance L; the negative electrode of described Schottky diode D1 is output; described capacitor C 2 is connected between the negative electrode and ground of described Schottky diode D1; second end of the high potential termination inductance L of described switching tube; described control end of switching tube connects the output of protection control circuit; the cold end of described switching tube is by sampling resistor R1 ground connection; the in-phase input end of described operational amplifier U1 connects the cold end of described switching tube by resistance R 3; the input of the output termination protection control circuit of described operational amplifier U1; the negative electrode of described voltage-stabiliser tube ZD1 connects inverting input and the power supply of operational amplifier U1 simultaneously; the plus earth of described voltage-stabiliser tube ZD1 is between described resistance R 2 and capacitor C 1 parallel connection power supply and the ground.
2. booster circuit as claimed in claim 1, it is characterized in that, described switching tube adopts NPN type triode Q1, the base stage of described NPN type triode Q1 is control end of switching tube, the current collection of described NPN type triode Q1 is the hot end of switching tube very, and the emission of described NPN type triode Q1 is the cold end of switching tube very.
3. booster circuit as claimed in claim 1, it is characterized in that, described switching tube adopts N-type metal-oxide-semiconductor Q2, the grid of described N-type metal-oxide-semiconductor Q2 is control end of switching tube, the drain electrode of described N-type metal-oxide-semiconductor Q2 is the hot end of switching tube, and the source electrode of described N-type metal-oxide-semiconductor Q2 is the cold end of switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320184732 CN203180783U (en) | 2013-04-12 | 2013-04-12 | Boosted circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320184732 CN203180783U (en) | 2013-04-12 | 2013-04-12 | Boosted circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203180783U true CN203180783U (en) | 2013-09-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320184732 Expired - Fee Related CN203180783U (en) | 2013-04-12 | 2013-04-12 | Boosted circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203180783U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762545A (en) * | 2014-02-14 | 2014-04-30 | 太原理工大学 | Multi-stage controllable current protection circuit |
| CN104466915A (en) * | 2013-09-12 | 2015-03-25 | 株式会社东芝 | Dc-dc converter and semiconductor integrated circuit |
| CN104617775A (en) * | 2013-11-05 | 2015-05-13 | 深圳市海洋王照明工程有限公司 | Switch power circuit and LED lamp |
| CN105024564A (en) * | 2014-04-24 | 2015-11-04 | 苏州华芯微电子股份有限公司 | CS short-circuit protection circuit of switching power supply |
| CN105449642A (en) * | 2015-12-30 | 2016-03-30 | 广州金升阳科技有限公司 | Protection method and circuit of Boost circuit |
| CN105978340A (en) * | 2015-03-10 | 2016-09-28 | 立锜科技股份有限公司 | Power converter, switch control circuit and short circuit detection method for current sensing resistor of the power converter |
| CN106354075A (en) * | 2016-11-25 | 2017-01-25 | 北京意同创科技有限公司 | Control circuit of remote controller with backlight screen |
| CN106712199A (en) * | 2017-01-22 | 2017-05-24 | 湖南电将军新能源有限公司 | Over-current protection circuit and method for automobile starting power supply |
-
2013
- 2013-04-12 CN CN 201320184732 patent/CN203180783U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466915A (en) * | 2013-09-12 | 2015-03-25 | 株式会社东芝 | Dc-dc converter and semiconductor integrated circuit |
| CN104617775A (en) * | 2013-11-05 | 2015-05-13 | 深圳市海洋王照明工程有限公司 | Switch power circuit and LED lamp |
| CN103762545B (en) * | 2014-02-14 | 2016-04-27 | 太原理工大学 | A kind of multi-stage controllable current protection circuit |
| CN103762545A (en) * | 2014-02-14 | 2014-04-30 | 太原理工大学 | Multi-stage controllable current protection circuit |
| CN105024564A (en) * | 2014-04-24 | 2015-11-04 | 苏州华芯微电子股份有限公司 | CS short-circuit protection circuit of switching power supply |
| CN105978340A (en) * | 2015-03-10 | 2016-09-28 | 立锜科技股份有限公司 | Power converter, switch control circuit and short circuit detection method for current sensing resistor of the power converter |
| CN105978340B (en) * | 2015-03-10 | 2018-12-04 | 立锜科技股份有限公司 | Power adapter, ON-OFF control circuit and current sensing resistor short circuit method for detecting |
| CN105449642A (en) * | 2015-12-30 | 2016-03-30 | 广州金升阳科技有限公司 | Protection method and circuit of Boost circuit |
| CN105449642B (en) * | 2015-12-30 | 2017-11-07 | 广州金升阳科技有限公司 | A kind of guard method of Boost circuit and circuit |
| CN106354075A (en) * | 2016-11-25 | 2017-01-25 | 北京意同创科技有限公司 | Control circuit of remote controller with backlight screen |
| CN106354075B (en) * | 2016-11-25 | 2020-01-21 | 北京意同创科技有限公司 | Remote controller control circuit with backlight screen |
| CN106712199A (en) * | 2017-01-22 | 2017-05-24 | 湖南电将军新能源有限公司 | Over-current protection circuit and method for automobile starting power supply |
| CN106712199B (en) * | 2017-01-22 | 2023-12-29 | 湖南电将军新能源有限公司 | Overcurrent protection circuit and method for automobile starting power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20190412 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |