CN105515357B - A kind of DCDC current-limiting circuits - Google Patents
A kind of DCDC current-limiting circuits Download PDFInfo
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- CN105515357B CN105515357B CN201510876247.4A CN201510876247A CN105515357B CN 105515357 B CN105515357 B CN 105515357B CN 201510876247 A CN201510876247 A CN 201510876247A CN 105515357 B CN105515357 B CN 105515357B
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a kind of DCDC current-limiting circuits.The current-limiting circuit includes power conversion module, image current module and makes energy control module；Wherein power conversion module is electrically connected with image current module；Image current module receives the output current of power conversion module, the current-limiting resistance that wherein flows through all the way of electric current flows to the first transistor emitter, another way electric current flows through first resistor and flows to the second transistor emitter from the second transistor collector outflow image current, the base stage of first triode and the electrical connection of the base stage of the second triode, second resistance of connecting between the base stage and ground of the first triode；Energy control module is made to be series between image current module and power conversion module, energy control module is made to receive image current, the output current in power conversion module is adjusted with cut-off the third transistor in energy control module is connected by image current control.Realize reduces the effect of power consumption while chip is protected.
Description
Technical field
The present invention relates to the present invention relates to a kind of DC power supply circuit, more particularly to a kind of DCDC current-limiting circuits.
Background technology
On current consumption market, portable electronic device, special standby is battery-powered electronic product, such as hand
The demand of machine, tablet computer etc. is increasing, for the design of the power management as DC-DC converter, how to drop
The working life that low-power consumption raising efficiency extends battery to the maximum extent becomes the problem of current urgently to be resolved.And current-limiting circuit
Application, can prevent the switching device inside power conversion chip from bearing excessive rush of current, cause unnecessary harm, protect
Protect power supply chip；Meanwhile improve the working efficiency of chip.
But the DCDC current-limiting circuits in the current power supply changeover device using Fig. 1 main in the prior art, such as scheme
The basic principle of DCDC current-limiting circuits in 1：In order to the electric current of detection switch pipe, connect one between metal-oxide-semiconductor Q10 and ground
Examine leakage resistance R10.According to the pressure drop on inspection leakage resistance R10 it is known that practical electric current, converts the current to voltage in this way,
Compared with the reference voltage level V of setting.The output of comparator COMP is subjected to logic and operation with the pwm signal inputted and is exported
As a result, adjusting the frequency and duty ratio of the drive signal of metal-oxide-semiconductor Q10 by the result of output, achieve the purpose that current limliting.Due to
The selection of reference voltage also has certain requirement, it is impossible to which too small, generally 1V or so of selection is examined on leakage resistance R10 in this way
Power consumption is bigger.
Invention content
The present invention provides a kind of DCDC current-limiting circuits, which realizes reduces work(while chip is protected
Consumption.
An embodiment of the present invention provides a kind of DCDC current-limiting circuits, including；Power conversion module, image current module and make
Energy control module；Wherein, the power conversion module is described for the DC voltage of input to be converted into required DC voltage
Power conversion module is electrically connected with the image current module；The image current module receives the defeated of the power conversion module
Go out electric current, the current-limiting resistance that wherein flows through all the way of the electric current flows to the first transistor emitter, and another way electric current flows through first
Resistance flows to the second transistor emitter and flows out image current, the base of first triode from second transistor collector
The base stage of pole and the second triode is electrically connected, second resistance of connecting between the base stage and ground of first triode；It is described enabled
Control module is series between image current module and power conversion module, described that energy control module is made to receive the mirror image electricity
Stream makes the third transistor in energy control module be connected with cut-off and then adjusting power conversion by the image current to control
Mould output current in the block.
Further, first triode and second triode are identical two PNP, tri- poles of each parameter
Pipe.
Further, the third transistor is NPN triode.
Further, the power conversion module includes：DCDC power conversion chips, the DCDC power conversions chip packet
Enabled pin and output voltage monitoring pin are included, the enabled pin is with connecting the collector of third transistor in energy control module
It connects, adjusts the height of current potential on enabled pin by controlling conducting and the cut-off of third transistor, power conversion module passes through
High low potential exports different electric currents；The output voltage monitoring pin is connect with feedback circuit, for exporting stable institute
Need DC voltage.
Further, the model TPS54232DR of the DCDC power conversions chip.
Further, the feedback circuit includes the first capacitance, 3rd resistor and the 4th resistance；The 3rd resistor and
Four resistance connect, first capacitance is in parallel with 3rd resistor, the electric connecting terminal between the 3rd resistor and the 4th resistance and
The output voltage monitoring pin electrical connection.
Further, it is described that energy control module is made to further include the second capacitance, the 5th resistance and the 6th resistance；Described second
The 5th resistance, the collector of second triode are in series between the base stage of the collector of triode and the third transistor
The 6th resistance is in series between ground, both ends of the third transistor collector and emitter respectively with the second capacitance are connect.
Technical solution provided by the invention passes through image current module and the enabled control of connecting in power conversion module circuit
Molding block, the image current module receive the output current of the power conversion module, and the electric current wherein flows through all the way
Current-limiting resistance flows to the first transistor emitter, and another way electric current flows through first resistor and flows to the second transistor emitter from described
Second transistor collector flows out image current, the base stage of first triode and the base stage electrical connection of the second triode, institute
State second resistance of connecting between the base stage of the first triode and ground；It is described that energy control module is made to be series at image current module and electricity
It is described that energy control module is made to receive the image current between the conversion module of source, enabled control is controlled by the image current
Molding third transistor conducting in the block is with ending and then adjusting the output current in power conversion module.Solves traditional circuit
Middle current limliting realizes the effect that power consumption is reduced while chip is protected power consumption is bigger on resistance the problem of.
Description of the drawings
Fig. 1 is the circuit diagram of DCDC current-limiting circuits in the prior art；
Fig. 2 is the structure diagram of a kind of DCDC current-limiting circuits that the embodiment of the present invention one provides；
Fig. 3 is the circuit diagram of image current module in the embodiment of the present invention one；
Fig. 4 is a kind of circuit diagram of DCDC current-limiting circuits provided by Embodiment 2 of the present invention；
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
Part related to the present invention rather than entire infrastructure are illustrated only in description, attached drawing.
Embodiment one
Fig. 2 is the structure diagram of a kind of DCDC current-limiting circuits that the embodiment of the present invention one provides, and Fig. 3 is implemented for the present invention
The circuit diagram of image current module in example one, as shown in Figures 2 and 3, the DCDC current-limiting circuits, including：Power conversion module
110th, image current module 120 and make energy control module 130；Wherein, the power conversion module 110 is used for the direct current inputted
Voltage is converted into required DC voltage, and the power conversion module 110 is electrically connected with the image current module 120；It is described
Image current module 120 receives the output current of the power conversion module 110, and the electric current wherein flows through current limliting electricity all the way
Resistance R flows to the first triode Q1 emitters, and another way electric current flows through first resistor R1 and flows to the second triode Q2 emitters from institute
State the second triode Q2 collectors outflow image current, the base stage of the first triode Q1 and the base stage electricity of the second triode Q2
Connection, connect second resistance R2 between the base stage and ground of the first triode Q1；It is described that energy control module 130 is made to be series at mirror
It is described that energy control module 130 is made to receive the image current between image current module 120 and power conversion module 110, pass through institute
State image current makes the third transistor in energy control module 130 be connected with ending and then adjusting power conversion module to control
Output current in 110.
Wherein, the first triode Q1 and the second triode Q2 is identical two PNP, tri- poles of each parameter
Pipe.
Specifically, the voltage that two identical triodes ensure that base stage to emitter is identical, and two triodes
Base stage be equipotentiality point, so that the voltage on current-limiting resistance R is identical with the voltage on first resistor R1.Flow through current limliting electricity
Electric current on resistance R and first resistor R1 is inversely proportional, such as current-limiting resistance R=0.1 Ω with resistance value, first resistor R=1K Ω, if stream
The electric current for crossing current-limiting resistance R is I=1A, then the electric current for flowing through first resistor R1 is I1=0.1mA, due to depositing for current-limiting resistance R
The electric current for flowing through first resistor is being caused to be 0.1mA, is being 1/1000 of total current in circuit, plays the role of current limliting.When similary
1A electric currents flow through on the current-limiting resistance of traditional current-limiting circuit and the current-limiting resistance R of the present embodiment, in traditional current-limiting circuit
The power consumption of current-limiting resistance is about 1W, and the power consumption on the current-limiting resistance R of the present invention is only 0.1W.Realize the effect of low-power consumption
Fruit.
A kind of DCDC current-limiting circuits provided in an embodiment of the present invention pass through mirror image electricity of connecting in power conversion module circuit
Flow module and make energy control module, the image current module receives the output current of the power conversion module, the electric current
The current-limiting resistance that wherein flows through all the way flow to the first transistor emitter, another way electric current flows through first resistor and flows to the two or three pole
Pipe emitter flows out image current from second transistor collector, the base stage of first triode and the second triode
Base stage is electrically connected, second resistance of connecting between the base stage and ground of first triode；It is described that energy control module is made to be series at mirror
It is described that energy control module is made to receive the image current between image current module and power conversion module, pass through mirror image electricity
Stream makes the conducting of the third transistor in energy control module with ending and then adjusting the output current in power conversion module to control.
Solve the problems, such as that current limliting power consumption on resistance is bigger in traditional circuit, realize reduces power consumption while chip is protected
Effect.
Embodiment two
Fig. 4 is a kind of circuit diagram of DCDC current-limiting circuits provided by Embodiment 2 of the present invention.As shown in figure 4, the present embodiment
Based on above-described embodiment.
Power conversion module 110 includes the peripheral circuit of DCDC power conversions chip and DCDC chips, the DCDC electricity
Source conversion chip includes enabled pin EN and output voltage monitoring pin VSENSE, the enabled pin EN and makes energy control module
The collector connection of middle third transistor Q3 adjusts EN on enabled pin by controlling conducting and the cut-off of third transistor Q3
The height of current potential, power conversion module 110 export different electric currents by high low potential；The output voltage monitors pin
VSENSE is connect with feedback circuit, for exporting stable required DC voltage.
Specifically, the DCDC power conversions chip is the chip of TPS systems class, such as TPS54232, TPS54232D and
The chip of TPS54232DR etc., preferably model TPS54232DR.
TPS54232DR chips, including input pin VIN, start pin BOOT, phase terminal pin PH, grounding pin GND,
Compensation pin COMP, output voltage monitoring pin VSENSE, enabled pin EN and soft start pin SS；The pin VIN connects
Enter external dc voltage, VIN pin serial connections have resistance R7 and resistance R8, for dividing, start pin BOOT and phase terminal pin
PH is electrically connected respectively with capacitance C3 both ends, for improving the voltage of power supply；Phase terminal pin PH connects with the first end of inductance L,
The second end of the inductance L is electrically connected with 120 input terminal of image current module；Between phase terminal pin PH and grounding pin GND
Sustained diode is connected to, the current break in electric current is prevented, is in series between the second end of the inductance L and grounding pin GND
Capacitance C4, the capacitance both ends C4 are parallel with capacitance C5；It connects between compensation pin COMP pins and ground and has been sequentially connected in series capacitance
C6 and resistance R9, the capacitance C6 and resistance R9 both ends are parallel with capacitance C7；Enabled pin EN and make in energy control module 130 the
Three triode Q3 connections adjust the height of current potential on enabled foot, power supply by controlling conducting and the cut-off of third transistor Q3
Conversion module 110 exports different electric currents by high low potential；The output voltage monitoring pin VSENSE and feedback circuit
Connection, for exporting stable required DC voltage.
Wherein, the feedback circuit includes the first capacitance C1,3rd resistor R3 and the 4th resistance R4；The 3rd resistor R3
It connects with the 4th resistance R4, the first capacitance C1 is in parallel with 3rd resistor R3, by adjusting 3rd resistor R3 and the 4th resistance
The resistance value of R4 stablizes the required DC voltage of output.
Wherein, it is described that energy control module is made to further include the second capacitance C2, the 5th resistance R5 and the 6th resistance R6；Described
The 5th resistance R5, second triode are in series between the base stage of the collector of two triode Q2 and the third transistor Q3
The 6th resistance R6 is in series between the collector and ground of Q2, the third transistor Q3 collector and emitters are electric with second respectively
Hold the both ends connection of C2.
Further, the third transistor is the preferred NPN triode of switch type transistor.
The concrete operating principle of above example of the present invention：The input pin VIN of power conversion module 110 receives extraneous
DC voltage, by DCDC power conversion chips, output current, electric current flows through inductance L, and image current module 120 receives described
Electric current, wherein flowing through current-limiting resistance R all the way flows to the first triode Q1, another way electric current flows through first resistor R1 and flows to the two or three
Pole pipe Q2, and image current is formed, as output current gradually increases, flow through the electric current on current-limiting resistance R and also gradually increase, together
The electric current flowed through on first resistor R1 of sample can also increase therewith, and image current also gradually increases, and image current flows through enabled control
Molding block 130, driving make the three or three pipe Q3 of energy control module 130, when the electric current for flowing through third transistor Q3 is more than unlatching value
When, third transistor Q3 can be connected, so as to drag down the current potential that pin EN is enabled in power conversion module 110, power conversion module
110 receive low potentials, adjust electric current so that the electric current of output reduce, same image current also reduces therewith, flows through third
The electric current of triode Q3 is also gradually reduced, and when the unlatching value less than third transistor Q3, third transistor Q3 cut-offs make at this time
Current potential that can be on pin EN increases, and power conversion module connects high potential, adjusts electric current so that the electric current of output become larger.Pass through
Electric current is adjusted repeatedly to achieve the purpose that current limliting.
A kind of DCDC current-limiting circuits provided in an embodiment of the present invention pass through mirror image electricity of connecting in power conversion module circuit
Flow module and make energy control module, the image current module receives the output current of the power conversion module, the electric current
The current-limiting resistance that wherein flows through all the way flow to the first transistor emitter, another way electric current flows through first resistor and flows to the two or three pole
Pipe emitter flows out image current from second transistor collector, the base stage of first triode and the second triode
Base stage is electrically connected, second resistance of connecting between the base stage and ground of first triode；It is described that energy control module is made to be series at mirror
It is described that energy control module is made to receive the image current between image current module and power conversion module, pass through mirror image electricity
Stream makes the conducting of the third transistor in energy control module with ending and then adjusting the output current in power conversion module to control.
Solve the problems, such as that current limliting power consumption on resistance is bigger in traditional circuit, realize reduces power consumption while chip is protected
Effect.
Note that it above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiment described here, can carry out for a person skilled in the art various apparent variations,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
It can include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (7)
1. a kind of DCDC current-limiting circuits, which is characterized in that including：
Power conversion module, image current module and make energy control module；Wherein,
The power conversion module is used to for the DC voltage of input to be converted into required DC voltage, the power conversion module
It is electrically connected with the image current module；
The image current module receives the output current of the power conversion module, and the electric current wherein flows through current limliting all the way
Resistance flows to the first transistor emitter, and another way electric current flows through first resistor and flows to the second transistor emitter from described second
Transistor collector flows out image current, the base stage electrical connection of the base stage of first triode and the second triode, and described the
It connects between the base stage of one triode and ground second resistance；
It is described that energy control module is made to be series between image current module and power conversion module, it is described to receive energy control module
The image current makes the third transistor in energy control module be connected with cut-off and then tune by the image current to control
Save the output current in power conversion module.
2. DCDC current-limiting circuits according to claim 1, which is characterized in that first triode and the two or three pole
It manages as identical two PNP triodes of each parameter.
3. DCDC current-limiting circuits according to claim 1, which is characterized in that the third transistor is NPN triode.
4. DCDC current-limiting circuits according to claim 1, which is characterized in that the power conversion module includes：DCDC electricity
Source converts chip, and the DCDC power conversions chip includes enabled pin and output voltage monitoring pin, the enabled pin with
Connect the collector of third transistor in energy control module, the conducting by controlling third transistor is enabled to adjust with cut-off
The height of current potential on pin, power conversion module export different electric currents by high low potential；The output voltage monitoring is drawn
Foot is connect with feedback circuit, for exporting stable required DC voltage.
5. DCDC current-limiting circuits according to claim 4, which is characterized in that the model of the DCDC power conversions chip
TPS54232DR。
6. DCDC current-limiting circuits according to claim 4, which is characterized in that the feedback circuit includes the first capacitance, the
Three resistance and the 4th resistance；The 3rd resistor and the series connection of the 4th resistance, first capacitance is in parallel with 3rd resistor, and described the
Electric connecting terminal between three resistance and the 4th resistance is electrically connected with output voltage monitoring pin.
7. DCDC current-limiting circuits according to claim 1, which is characterized in that described that energy control module is made to further include the second electricity
Appearance, the 5th resistance and the 6th resistance；It connects between the collector of second triode and the base stage of the third transistor
There is the 5th resistance, the 6th resistance, the current collection of the third transistor are in series between the collector and ground of second triode
The both ends of pole and emitter respectively with the second capacitance are connect.
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| CN201510876247.4A CN105515357B (en) | 2015-12-03 | 2015-12-03 | A kind of DCDC current-limiting circuits |
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| CN105515357B true CN105515357B (en) | 2018-06-12 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105915029B (en) * | 2016-06-07 | 2018-08-07 | 青岛歌尔声学科技有限公司 | Power supply conversion efficiency selection circuit, method and mobile power |
| CN110545031B (en) * | 2019-07-26 | 2020-12-18 | 上海空间电源研究所 | Laser load distributor current-limiting control circuit for space |
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