CN105515357A - DCDC current-limiting circuit - Google Patents
DCDC current-limiting circuit Download PDFInfo
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- CN105515357A CN105515357A CN201510876247.4A CN201510876247A CN105515357A CN 105515357 A CN105515357 A CN 105515357A CN 201510876247 A CN201510876247 A CN 201510876247A CN 105515357 A CN105515357 A CN 105515357A
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- current
- triode
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- power conversion
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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 DCDC current-limiting circuit. The current-limiting circuit comprises a power conversion module, an image current module and an enable-control module. The power conversion module and the image current module are electrically connected. The image current module receives the output current of the power conversion module. One path of the current flows to the emitter of a first triode through a current-limiting resistor. The other path of the current flows from the emitter of a second triode out of the collector of the second triode through a first resistor in the form of the image current. The base of the first triode and the base of the second triode are electrically connected. A second resistor is connected in series between the base of the first triode and the ground. The enable-control module is connected in series between the image current module and the power conversion module. The enable-control module receives the above image current. Based on the image current, a third triode in the enable-control module is controlled to be switched on/off, so that the output current in the power conversion module can be adjusted. Therefore, the chip protection function is realized, while the power consumption is reduced at the same time.
Description
Technical field
The present invention relates to a kind of DC power supply circuit, particularly relate to a kind of DCDC current-limiting circuit.
Background technology
On current consumption market, portable electric appts, spy is standby is battery-powered electronic product, the demand of such as mobile phone, panel computer etc. is increasing, for the design of the power management as DC-DC converter, how to reduce power consumption and raise the efficiency the working life extending battery to greatest extent and become the current problem that urgently will solve.And the application of current-limiting circuit, can prevent the switching device of power conversion chip inside from bearing excessive rush of current, cause unnecessary harm, protection power source chip; Meanwhile, the operating efficiency of chip is improved.
But, DCDC current-limiting circuit in current prior art in the main power supply changeover device adopting Fig. 1, general principle as DCDC current-limiting circuit in Fig. 1: in order to can the electric current of sense switch pipe, connect an inspection leakage resistance R10 between metal-oxide-semiconductor Q10 and ground.Just can know actual electric current according to the pressure drop on inspection leakage resistance R10, like this current conversion be become voltage, compare with the reference voltage level V of setting.The pwm signal of the output of comparator COMP and input is carried out logic and operation and Output rusults, is regulated frequency and the duty ratio of the drive singal of metal-oxide-semiconductor Q10 by the result exported, reach the object of current limliting.Because the selection of reference voltage also has certain requirement, that can not select is too little, is generally about 1V, and the power dissipation ratio examined on leakage resistance R10 is like this larger.
Summary of the invention
The invention provides a kind of DCDC current-limiting circuit, this current-limiting circuit achieves and reduce power consumption while protect IC.
Embodiments provide a kind of DCDC current-limiting circuit, comprise; Power conversion module, image current module and make energy control module; Wherein, described power conversion module is used for the direct voltage of input to be converted into required direct voltage, and described power conversion module is electrically connected with described image current module; Described image current module receives the output current of described power conversion module, a wherein road of described electric current is flow through current-limiting resistance and is flowed to the first transistor emitter, another road electric current flows through the first resistance and flows to the second transistor emitter from described second transistor collector outflow image current, the base stage of described first triode and the base stage electrical connection of the second triode, base stage and second resistance of connecting between ground of described first diode; The described energy control module that makes is series between image current module and power conversion module, described enable module receives described image current, controls to make the 3rd triode ON in energy control module and cut-off and then regulate the output current in power conversion module by described image current.
Further, described first triode and described second triode are identical two PNP triode of each parameter.
Further, described 3rd triode is NPN triode.
Further, described power conversion module comprises: DCDC power conversion chip, described DCDC power conversion chip comprises enable pin and output voltage monitoring pin, described enable pin is connected with making the 3rd triode in energy control module, regulated the height of current potential on enable pin by the conducting and cut-off controlling the 3rd triode, power conversion module exports different electric currents by high electronegative potential; Described output voltage monitoring pin is connected with feedback circuit, for direct voltage needed for stable output.
Further, the signal of described DCDC power conversion chip is TPS54232DR.
Further, described feedback circuit comprises the first electric capacity, the 3rd resistance and the 4th resistance; Described 3rd resistance and the 4th resistant series, described first electric capacity and the 3rd resistor coupled in parallel, the electric connecting terminal between described 3rd resistance and the 4th resistance is monitored pin with described output voltage and is electrically connected.
Further, energy control module is made also to comprise the second electric capacity, the 5th resistance and the 6th resistance described in; Be in series with the 5th resistance between the collector electrode of described second triode and the base stage of described 3rd triode, be in series with the 6th resistance between the collector electrode of described second triode and ground, the two ends of described 3rd triode are parallel with the second electric capacity.
Technical scheme provided by the invention, by tandem mirror image current module in power conversion modular circuit and make energy control module, described image current module receives the output current of described power conversion module, a wherein road of described electric current is flow through current-limiting resistance and is flowed to the first transistor emitter, another road electric current flows through the first resistance and flows to the second transistor emitter from described second transistor collector outflow image current, the base stage of described first triode and the base stage electrical connection of the second triode, base stage and second resistance of connecting between ground of described first diode; The described energy control module that makes is series between image current module and power conversion module, described enable module receives described image current, controls to make the 3rd triode ON in energy control module and cut-off and then regulate the output current in power conversion module by described image current.Solve the problem that in traditional circuit, current limliting power dissipation ratio on resistance is larger, achieve the effect reducing power consumption while protect IC.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of DCDC current-limiting circuit in prior art;
The structural representation of a kind of DCDC current-limiting circuit that Fig. 2 provides for the embodiment of the present invention one;
Fig. 3 is the circuit diagram of image current module in the embodiment of the present invention one;
The circuit diagram of a kind of DCDC current-limiting circuit that Fig. 4 provides for the embodiment of the present invention two;
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not entire infrastructure.
Embodiment one
The structural representation of a kind of DCDC current-limiting circuit that Fig. 2 provides for the embodiment of the present invention one, Fig. 3 is the circuit diagram of image current module in the embodiment of the present invention one, as shown in Figures 2 and 3, described DCDC current-limiting circuit, comprising: power conversion module 110, image current module 120 and make energy control module 130; Wherein, described power conversion module 110 is for being converted into required direct voltage by the direct voltage of input, and described power conversion module 110 is electrically connected with described image current module 120; Described image current module 120 receives the output current of described power conversion module 110, a wherein road of described electric current is flow through current-limiting resistance R and is flowed to the first triode Q1 emitter, another road electric current flows through the first resistance R1 and flows to the second triode Q2 emitter from described second triode Q2 collector electrode outflow image current, the base stage of described first triode Q1 and the base stage electrical connection of the second triode Q2, base stage and the second resistance R2 that connects between ground of described first triode Q1; The described energy control module 130 that makes is series between image current module 120 and power conversion module 110, the described energy control module 130 that makes receives described image current, controls to make the 3rd triode ON in energy control module 130 and cut-off and then regulate the output current in power conversion module 110 by described image current.
Wherein, described first triode Q1 and described second triode Q2 is identical two PNP triode of each parameter.
Concrete, it is identical that two identical triodes ensure that base stage arrives the voltage of emitter, and the base stage of two triodes is equipotentiality point, makes the voltage on current-limiting resistance R identical with the voltage on the first resistance R1 like this.Namely electric current on current-limiting resistance R and the first resistance R1 is flow through and resistance is inversely proportional to, such as current-limiting resistance R=0.1 Ω, first resistance R=1K Ω, if the electric current flowing through current-limiting resistance R is I=1A, the electric current then flowing through the first resistance R1 is I1=0.1mA, existence due to current-limiting resistance R makes the electric current flowing through the first resistance be 0.1mA, is 1/1000 of total current in loop, plays the effect of current limliting.When same 1A electric current flows through on the current-limiting resistance of traditional current-limiting circuit and the current-limiting resistance R of the present embodiment, the power consumption of the current-limiting resistance in traditional current-limiting circuit is about 1W, and the power consumption on current-limiting resistance R of the present invention is only 0.1W.Achieve the effect of low-power consumption.
A kind of DCDC current-limiting circuit that the embodiment of the present invention provides, by tandem mirror image current module in power conversion modular circuit and make energy control module, described image current module receives the output current of described power conversion module, a wherein road of described electric current is flow through current-limiting resistance and is flowed to the first transistor emitter, another road electric current flows through the first resistance and flows to the second transistor emitter from described second transistor collector outflow image current, the base stage of described first triode and the base stage electrical connection of the second triode, base stage and second resistance of connecting between ground of described first diode, the described energy control module that makes is series between image current module and power conversion module, the described energy control module that makes receives described image current, controls to make the 3rd triode ON in energy control module and cut-off and then regulate the output current in power conversion module by described image current.Solve the problem that in traditional circuit, current limliting power dissipation ratio on resistance is larger, achieve the effect reducing power consumption while protect IC.
Embodiment two
The circuit diagram of a kind of DCDC current-limiting circuit that Fig. 4 provides for the embodiment of the present invention two.As shown in Figure 4, the present embodiment is based on above-described embodiment.
Power conversion module 110 comprises the peripheral circuit of DCDC power conversion chip and DCDC chip, described DCDC power conversion chip comprises enable pin EN and output voltage monitoring pin VSENSE, described enable pin EN is connected with making the 3rd triode Q3 in energy control module, regulated the height of EN current potential on enable pin by the conducting and cut-off controlling the 3rd triode Q3, power conversion module 110 exports different electric currents by high electronegative potential; Described output voltage monitoring pin VSENSE is connected with feedback circuit, for direct voltage needed for stable output.
Concrete, described DCDC power conversion chip is the chip of TPS system class, and as TPS54232, TPS54232D and TPS54232DR etc., preferred model is the chip of TPS54232DR.
TPS54232DR chip, comprises input pin VIN, startup pin BOOT, phase terminal pin PH, grounding pin GND, compensation pin COMP, output voltage monitoring pin VSENSE, enable pin EN and soft start pin SS; Described pin VIN accesses external dc voltage, and VIN pin serial connection has resistance R7 and resistance R8, for dividing potential drop, starts pin BOOT and is electrically connected with electric capacity C3 two ends respectively with phase terminal pin PH, for improving the voltage of power supply; Phase terminal pin PH connects with the first end of inductance L, and the second end of described inductance L is electrically connected with image current module 120 input; Be connected to sustained diode between phase terminal pin PH and grounding pin GND, prevent the current break in electric current, be in series with electric capacity C4 between the second end of described inductance L and grounding pin GND, described electric capacity two ends C4 is parallel with electric capacity C5; Compensation pin COMP pin is in series with electric capacity C6 and resistance R9 successively with connecting between ground, and described electric capacity C6 and resistance R9 two ends are parallel with electric capacity C7; Enable pin EN is connected with making the 3rd triode Q3 in energy control module 130, and regulated the height of current potential on enable pin by the conducting and cut-off controlling the 3rd triode Q3, power conversion module 110 exports different electric currents by high electronegative potential; Described output voltage monitoring pin VSENSE is connected with feedback circuit, for direct voltage needed for stable output.
Wherein, described feedback circuit comprises the first electric capacity C1, the 3rd resistance R3 and the 4th resistance R4; Described 3rd resistance R3 and the 4th resistance R4 connects, and described first electric capacity C1 is in parallel with the 3rd resistance R3, stablizes direct voltage needed for output by the resistance adjusting the 3rd resistance R3 and the 4th resistance R4.
Wherein, energy control module is made also to comprise the second electric capacity C2, the 5th resistance R5 and the 6th resistance R6 described in; Be in series with the 5th resistance R5 between the collector electrode of described second triode Q2 and the base stage of described 3rd triode Q3, be in series with the 6th resistance R6 between the collector electrode of described second triode Q2 and ground, the two ends of described 3rd triode Q3 are parallel with the second electric capacity C2.
Further, described 3rd triode is the preferred NPN triode of switch type transistor.
The specific works principle of the above embodiment of the present invention: the input pin VIN of power conversion module 110 receives extraneous direct voltage, by DCDC power conversion chip, output current, electric current flows through inductance L, image current module 120 receives described electric current, wherein a road is flow through current-limiting resistance R and is flowed to the first triode Q1, another road electric current flows through the first resistance R1 and flows to the second triode Q2, and form image current, along with output current increases gradually, the electric current flow through on current-limiting resistance R also increases gradually, the same electric current flow through on the first resistance R1 also can increase thereupon, image current also increases gradually, image current flows through and makes energy control module 130, drive the three or the three pipe Q3 making energy control module 130, when the electric current flowing through the 3rd triode Q3 exceedes unlatching value, 3rd triode Q3 meeting conducting, thus drag down the current potential of enable pin EN in power conversion module 110, power conversion module 110 receives electronegative potential, adjustment electric current, the electric current of the output made reduces, same image current also reduces thereupon, the electric current flowing through the 3rd triode Q3 also reduces gradually, when being less than the unlatching value of the 3rd triode Q3, 3rd triode Q3 ends, current potential now on enable pin EN uprises, power conversion module connects high potential, adjustment electric current, the ER effect of the output made is large.The object of current limliting is reached by repeatedly adjusting electric current.
A kind of DCDC current-limiting circuit that the embodiment of the present invention provides, by tandem mirror image current module in power conversion modular circuit and make energy control module, described image current module receives the output current of described power conversion module, a wherein road of described electric current is flow through current-limiting resistance and is flowed to the first transistor emitter, another road electric current flows through the first resistance and flows to the second transistor emitter from described second transistor collector outflow image current, the base stage of described first triode and the base stage electrical connection of the second triode, base stage and second resistance of connecting between ground of described first diode, the described energy control module that makes is series between image current module and power conversion module, described enable module receives described image current, controls to make the 3rd triode ON in energy control module and cut-off and then regulate the output current in power conversion module by described image current.Solve the problem that in traditional circuit, current limliting power dissipation ratio on resistance is larger, achieve the effect reducing power consumption while protect IC.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (7)
1. a DCDC current-limiting circuit, is characterized in that, comprising:
Power conversion module, image current module and make energy control module; Wherein,
Described power conversion module is used for the direct voltage of input to be converted into required direct voltage, and described power conversion module is electrically connected with described image current module;
Described image current module receives the output current of described power conversion module, a wherein road of described electric current is flow through current-limiting resistance and is flowed to the first transistor emitter, another road electric current flows through the first resistance and flows to the second transistor emitter from described second transistor collector outflow image current, the base stage of described first triode and the base stage electrical connection of the second triode, base stage and second resistance of connecting between ground of described first diode;
The described energy control module that makes is series between image current module and power conversion module, described enable module receives described image current, controls to make the 3rd triode ON in energy control module and cut-off and then regulate the output current in power conversion module by described image current.
2. DCDC current-limiting circuit according to claim 1, is characterized in that, described first triode and described second triode are identical two PNP triode of each parameter.
3. DCDC current-limiting circuit according to claim 1, is characterized in that, described 3rd triode is NPN triode.
4. DCDC current-limiting circuit according to claim 1, it is characterized in that, described power conversion module comprises: DCDC power conversion chip, described DCDC power conversion chip comprises enable pin and output voltage monitoring pin, described enable pin is connected with making the 3rd triode in energy control module, regulated the height of current potential on enable pin by the conducting and cut-off controlling the 3rd triode, power conversion module exports different electric currents by high electronegative potential; Described output voltage monitoring pin is connected with feedback circuit, for direct voltage needed for stable output.
5. DCDC current-limiting circuit according to claim 4, is characterized in that, the signal of described DCDC power conversion chip is TPS54232DR.
6. DCDC current-limiting circuit according to claim 4, is characterized in that, described feedback circuit comprises the first electric capacity, the 3rd resistance and the 4th resistance; Described 3rd resistance and the 4th resistant series, described first electric capacity and the 3rd resistor coupled in parallel, the electric connecting terminal between described 3rd resistance and the 4th resistance is monitored pin with described output voltage and is electrically connected.
7. DCDC current-limiting circuit according to claim 1, is characterized in that, described in make energy control module also comprise the second electric capacity, the 5th resistance and the 6th resistance; Be in series with the 5th resistance between the collector electrode of described second triode and the base stage of described 3rd triode, be in series with the 6th resistance between the collector electrode of described second triode and ground, the two ends of described 3rd triode are parallel with the second electric capacity.
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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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| CN201510876247.4A CN105515357B (en) | 2015-12-03 | 2015-12-03 | A kind of DCDC current-limiting circuits |
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Cited By (2)
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| CN105915029A (en) * | 2016-06-07 | 2016-08-31 | 青岛歌尔声学科技有限公司 | Power supply conversion efficiency selection circuit, method and mobile power supply thereof |
| CN110545031A (en) * | 2019-07-26 | 2019-12-06 | 上海空间电源研究所 | Laser load distributor current-limiting control circuit for space |
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| CN110545031A (en) * | 2019-07-26 | 2019-12-06 | 上海空间电源研究所 | Laser load distributor current-limiting control circuit for space |
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| CN105515357B (en) | 2018-06-12 |
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Address after: 201203 Shanghai City, Pudong New Area China Zuchongzhi Road (Shanghai) Free Trade Zone No. 73 Lane 887 Applicant after: Shanghai ZTE energy Polytron Technologies Inc Applicant after: SHANGHAI ZHONGXINGXIN ADVANCED MATERIAL CO., LTD. Address before: 201203 Shanghai City, Pudong New Area China Zuchongzhi Road (Shanghai) Free Trade Zone No. 73 Lane 887 Applicant before: Zhongxing (Shanghai) Pylon Technology Co., Ltd. Applicant before: SHANGHAI ZHONGXINGXIN ADVANCED MATERIAL CO., LTD. |
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Address after: 201203 Pudong New Area, Shanghai, China (Shanghai) free trade trial area, 887 Lane 73, Chong Chong Road. Co-patentee after: SHANGHAI ZHONGXINGXIN ADVANCED MATERIAL CO., LTD. Patentee after: Shanghai PON energy Polytron Technologies Inc Address before: 201203 Pudong New Area, Shanghai, China (Shanghai) free trade trial area, 887 Lane 73, Chong Chong Road. Co-patentee before: SHANGHAI ZHONGXINGXIN ADVANCED MATERIAL CO., LTD. Patentee before: Shanghai ZTE energy Polytron Technologies Inc |
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Effective date of registration: 20200316 Address after: 201203 Shanghai City, Pudong New Area China Zuchongzhi Road (Shanghai) Free Trade Zone No. 73 Lane 887 Patentee after: PYLON TECHNOLOGIES Co.,Ltd. Address before: 201203 Shanghai City, Pudong New Area China Zuchongzhi Road (Shanghai) Free Trade Zone No. 73 Lane 887 Co-patentee before: SHANGHAI ZHONGXINGXIN ADVANCED MATERIAL Co.,Ltd. Patentee before: PYLON TECHNOLOGIES Co.,Ltd. |