CN103647445A - Direct current-direct current (DC-DC) power supply apparatus and current detection method thereof - Google Patents
Direct current-direct current (DC-DC) power supply apparatus and current detection method thereof Download PDFInfo
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- CN103647445A CN103647445A CN201310616031.5A CN201310616031A CN103647445A CN 103647445 A CN103647445 A CN 103647445A CN 201310616031 A CN201310616031 A CN 201310616031A CN 103647445 A CN103647445 A CN 103647445A
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Abstract
The invention discloses a direct current-direct current (DC-DC) power supply apparatus and a current detection method thereof and relates to the technical field of power supplies. With the direct current-direct current (DC-DC) power supply apparatus and the current detection method thereof of the invention adopted, whether the output current of a direct current-direct current (DC-DC) power supply satisfies conditions of the effective value of the current can be judged more conveniently and accurately. The current detection method of the direct current-direct current (DC-DC) power supply apparatus comprises the following steps that: a second end of an energy storage inductor upwarps such that the second end of the energy storage inductor is disconnected from a first end of the energy storage inductor and the output end of the direct current-direct current (DC-DC) power supply, and the second end of the energy storage inductor is connected with a first contact through a fly line; a first end of a first resistor upwarps such that the first end of the first resistor is disconnected from the output end of the direct current-direct current (DC-DC) power supply, and the first end of the first resistor is connected with the first contact through a fly line; a first end of an energy storage capacitor is connected with the first contact through a fly line; a second contact is grounded through a fly line; and the direct current-direct current (DC-DC) power supply apparatus operates, a current detection probe is utilized to detect current on the fly line between the first contact and the first end of the energy storage capacitor.
Description
Technical field
The present invention relates to power technique fields, relate in particular to a kind of DC-DC power-supply device and electric current detecting method thereof.
Background technology
Along with the arrival of cybertimes, people are also increasing to the demand of electronic equipment, and router, switch, speech ciphering equipment etc. are a large amount of applies to various occasions, and people also have higher requirement for the stability of electronic equipment.At present, be often provided with DC-DC (Direct Current-Direct Current, DC-DC) power supply on the printed circuit board (PCB) in electronic equipment (Printed Circuit Board, PCB), this DC-DC power supply is used to device power supply.Can DC-DC power supply normally work very large to the stability influence of electronic equipment, therefore, for DC-DC power supply can normally be worked, need to test the actual output current of DC-DC power supply, guarantee that the actual output current of DC-DC power supply meets the condition of its current effective value.
Because DC-DC power supply is arranged on pcb board, therefore cannot direct-detection, as shown in Figure 1, current DC-DC power supply comprises DC-DC chip 1, energy storage inductor L, storage capacitor C and feedback resistance R, the input IN of DC-DC chip 1 is as the input of DC-DC power supply, the output SW of DC-DC chip 1 is connected in energy storage inductor L, and the feedback end VFB of DC-DC chip 1 is connected in feedback resistance R, the earth terminal GND ground connection of DC-DC chip 1.The actual output current detection method of traditional DC-DC power supply comprises two kinds, the first is to cut off top layer wiring the series conductor at DC-DC power output end Vout place, use probe to coordinate oscilloscope to detect the electric current on this wire, but this method is only applicable to DC-DC power output end cabling in the situation that of pcb board top layer, and the process of cut-out cabling easily causes pcb board to damage; The second is that the output perk of energy storage inductor L is unsettled and series conductor is received storage capacitor C above for connecting one end of energy storage inductor L, use probe to coordinate oscilloscope to detect the electric current on this wire, but because detecting electric current, this does not pass through the shaping process that storage capacitor C and feedback resistance R coordinate with DC-DC chip, therefore this error detecting between electric current and actual output current is very large, cannot detect electric current according to this and accurately judge whether the output current of DC-DC power supply meets the condition of its current effective value.
Summary of the invention
The invention provides a kind of DC-DC power-supply device and electric current detecting method thereof, can judge convenient and accurately whether the output current of DC-DC power supply meets the condition of its current effective value.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
On the one hand, provide a kind of electric current detecting method of DC-DC power-supply device, described DC-DC power-supply device comprises current waveform calibrating installation and is arranged at the DC-DC power supply on pcb board;
Described DC-DC power supply comprises:
DC-DC chip;
Energy storage inductor, the first end of described energy storage inductor is connected in the output of described DC-DC chip;
Storage capacitor, the first end of described storage capacitor is connected in the second end of described energy storage inductor and the output of described DC-DC power supply, the second end ground connection of described storage capacitor;
The first resistance, the first end of described the first resistance is connected in the output of described DC-DC power supply, and the second end of described the first resistance is connected in the feedback end of described DC-DC chip;
The second resistance, the first end of described the second resistance is connected in the feedback end of described DC-DC chip, the second end ground connection of described the second resistance;
Described current waveform calibrating installation comprises calibration capacitance, the first contact and the second contact, and the first end of described calibration capacitance is connected in described the first contact, and the second end of described calibration capacitance is connected in described the second contact;
The electric current detecting method of described DC-DC power-supply device comprises:
By the second end perk of described energy storage inductor and the first end of described storage capacitor and the disconnection of the output of described DC-DC power supply, and the second end of described energy storage inductor is connected in to described the first contact by fly line;
The output of the first end perk of described the first resistance and described DC-DC power supply is disconnected, and the first end of described the first resistance is connected in to described the first contact by fly line;
The first end of described storage capacitor is connected in to described the first contact by fly line;
Fly line ground connection is passed through in described the second contact;
Described DC-DC power-supply device work, and use current detecting probe to detect electric current on the fly line between described the first contact and the first end of described storage capacitor.
On the other hand, provide a kind of DC-DC power-supply device, having comprised: current waveform calibrating installation and be arranged at the DC-DC power supply on pcb board;
Described DC-DC power supply comprises:
DC-DC chip;
Energy storage inductor, the first end of described energy storage inductor is connected in the output of described DC-DC chip, the second end perk of described energy storage inductor;
Storage capacitor, the first end of described storage capacitor is connected in the output of described DC-DC power supply, the second end ground connection of described storage capacitor;
The first resistance, the first end perk of described the first resistance, the second end of described the first resistance is connected in the feedback end of described DC-DC chip;
The second resistance, the first end of described the second resistance is connected in the feedback end of described DC-DC chip, the second end ground connection of described the second resistance;
Described current waveform calibrating installation comprises calibration capacitance, the first contact and the second contact, the first end of described calibration capacitance is connected in described the first contact, the second end of described calibration capacitance is connected in described the second contact, described the first contact is connected to the second end, the first end of described the first resistance and the first end of described storage capacitor of described energy storage inductor by fly line, described the second contact is by fly line ground connection.
Alternatively, described storage capacitor comprises the first storage capacitor and the second storage capacitor in parallel, the first end of described the first storage capacitor and the second storage capacitor is all connected in described the first contact by fly line, the equal ground connection of the second end of described the first storage capacitor and the second storage capacitor;
Described calibration capacitance comprises the first calibration capacitance and the second calibration capacitance in parallel, the first end of described the first calibration capacitance and the second calibration capacitance is all connected in described the first contact, and the second end of described the first calibration capacitance and the second calibration capacitance is all connected in described the second contact.
Particularly, the capacitance of described the first calibration capacitance and the second calibration capacitance is 47 μ F.
Particularly, described the first calibration capacitance and the second calibration capacitance are ceramic condenser.
Particularly, described the first contact comprises interconnective the first pad and the second pad, described the first pad is connected in the second end of described energy storage inductor by fly line, described the second pad is connected to the first end of described storage capacitor and the first end of described the first resistance by fly line.
DC-DC power-supply device provided by the invention and electric current detecting method thereof, by current waveform calibrating installation, be connected with the corresponding of DC-DC power supply on pcb board, make to detect electric current for the electric current through shaping calibration, therefore detect the actual output current that electric current approaches this DC-DC power supply more, and without increase extra device on original pcb board, can not damage pcb board, can judge convenient and accurately whether the output current of DC-DC power supply meets the condition of its current effective value yet.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of a kind of DC-DC power supply in prior art;
Fig. 2 is the structural representation of a kind of DC-DC power supply in the embodiment of the present invention;
Fig. 3 is the structural representation of a kind of current waveform calibrating installation in the embodiment of the present invention;
Fig. 4 is the electric current detecting method flow chart of a kind of DC-DC power-supply device in the embodiment of the present invention;
Fig. 5 is the structural representation of a kind of DC-DC power-supply device in the embodiment of the present invention;
Fig. 6 is the structural representation of another kind of DC-DC power-supply device in the embodiment of the present invention;
Fig. 7 is the structural representation of another kind of DC-DC power-supply device in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of electric current detecting method of DC-DC power-supply device, and this DC-DC power-supply device comprises current waveform calibrating installation and is arranged at the DC-DC power supply on pcb board; As shown in Figure 2, this DC-DC power supply comprises: DC-DC chip 1, and its input IN is as the input of whole DC-DC power supply, its earth terminal GND ground connection; Energy storage inductor L, the first end of energy storage inductor L is connected in the output of DC-DC chip 1; Storage capacitor C1, the first end of storage capacitor C1 is connected in the second end of energy storage inductor L and the output end vo ut of DC-DC power supply, the second end ground connection of storage capacitor C1; The first end of the first resistance R 1, the first resistance R 1 is connected in the output end vo ut of DC-DC power supply, and the second end of the first resistance R 1 is connected in the feedback end VFB of DC-DC chip 1; The first end of the second resistance R 1, the second resistance R 2 is connected in the feedback end VFB of DC-DC chip 1, the second end ground connection of the second resistance R 1; As shown in Figure 3, above-mentioned current waveform calibrating installation 2 comprises calibration capacitance C2, the first contact A and the second contact B, and the first end of calibration capacitance C2 is connected in the first contact A, and the second end of calibration capacitance C2 is connected in the second contact B;
As shown in Figure 4 and Figure 5, the electric current detecting method of above-mentioned DC-DC power-supply device comprises:
Particularly, because cabling in the DC-DC power supply being arranged on pcb board is inconvenient to block and is connected, and the link of individual devices perk easily being connected with fly line therefore in the present embodiment, makes the link perk of individual devices and is connected with current waveform calibrating installation 2 by fly line.
It should be noted that, step 101,102,103 and 104 is that above-mentioned current waveform calibrating installation 2 and the DC-DC power supply that is arranged on pcb board are coupled together, form DC-DC power-supply device as shown in Figure 5, so that ensuing electric current electrical measurement step, so the not restriction of time order and function order between step 101,102,103 and 104.
Particularly, after forming as shown in Figure 5 DC-DC power-supply device, the circuit of DC-DC power supply does not have material change, just calibration capacitance C2 realizes energy storage effect together with storage capacitor C1, because R1 and these two feedback resistances of R2 and calibration capacitance C2 are all connected to the first contact A, therefore the electric current that flows to storage capacitor C1 first end from the first contact A is through the shaping calibration of DC-DC chip 1, and this detection electric current is in close proximity to the actual output current of DC-DC power supply.In addition, between first end due to the first contact A and storage capacitor C1, by fly line, be connected, therefore can on this fly line, carry out the detection of electric current by the probe of the current sensing meanss such as hall device, current sensing means is connected in oscilloscope, and the waveform showing on oscilloscope by detection electric current judges whether this detection electric current meets the condition of its current effective value.After current detecting completes, remove current waveform calibrating installation 2, and by DC-DC power up to original state, the structure shown in Fig. 2, can not cause damage to original pcb board, the current waveform calibrating installation after removing can Reusability.
The electric current detecting method of DC-DC power-supply device in the present embodiment, by current waveform calibrating installation, be connected with the corresponding of DC-DC power supply on pcb board, make to detect electric current for the electric current through shaping calibration, therefore detect the actual output current that electric current approaches this DC-DC power supply more, and without increase extra device on original pcb board, can not damage pcb board, can judge convenient and accurately whether the output current of DC-DC power supply meets the condition of its current effective value yet.
As shown in Figure 5, the embodiment of the present invention provides a kind of DC-DC power-supply device, comprising: current waveform calibrating installation 2 and be arranged at the DC-DC power supply on pcb board; This DC-DC power supply comprises: DC-DC chip 1, and its input IN is as the input of whole DC-DC power supply, its earth terminal GND ground connection; Energy storage inductor L, the first end of energy storage inductor L is connected in the output SW of DC-DC chip 1, the second end perk of energy storage inductor L; Storage capacitor C1, the first end of storage capacitor C1 is connected in the output end vo ut of DC-DC power supply 3, the second end ground connection of storage capacitor C1; The first end perk of the first resistance R 1, the first resistance R 1, the second end of the first resistance R 1 is connected in the feedback end VFB of DC-DC chip 1; The first end of the second resistance R 2, the second resistance R 2 is connected in the feedback end VFB of described DC-DC chip 1, the second end ground connection of the second resistance R 2; Current waveform calibrating installation 2 comprises calibration capacitance C2, the first contact A and the second contact B, the first end of calibration capacitance C2 is connected in the first contact A, the second end of calibration capacitance C2 is connected in the second contact B, the first contact A is connected to the first end of the second end of energy storage inductor L, the first end of the first resistance R 1 and storage capacitor C1 by fly line, the second contact B is by fly line ground connection.
The electric current detecting method of this DC-DC power-supply device is same as the previously described embodiments, does not repeat them here.
DC-DC power-supply device in the present embodiment, by current waveform calibrating installation, be connected with the corresponding of DC-DC power supply on pcb board, make to detect electric current for the electric current through shaping calibration, therefore detect the actual output current that electric current approaches this DC-DC power supply more, and without increase extra device on original pcb board, can not damage pcb board, can judge convenient and accurately whether the output current of DC-DC power supply meets the condition of its current effective value yet.
Particularly, as shown in Figure 6, according to the needs of DC-DC power supply, above-mentioned storage capacitor C1 can comprise the first storage capacitor C1 ' and the second storage capacitor C1 ' ' in parallel, the first end of the first storage capacitor C1 ' and the second storage capacitor C1 ' ' is all connected in the first contact A by fly line, the equal ground connection of the second end of the first storage capacitor C1 ' and the second storage capacitor C1 ' '; Above-mentioned calibration capacitance C2 can comprise the first calibration capacitance C2 ' and the second calibration capacitance C2 ' ' in parallel, the first end of the first calibration capacitance C2 ' and the second calibration capacitance C2 ' ' is all connected in the first contact A, and the second end of the first calibration capacitance C2 ' and the second calibration capacitance C2 ' ' is all connected in the second contact B.Certainly, according to the different needs of DC-DC power supply, above-mentioned storage capacitor C1 also can comprise three, four or more storage capacitor in parallel, and above-mentioned calibration capacitance C2 also can comprise three, four or more calibration capacitance in parallel.
Preferably, the capacitance of above-mentioned the first calibration capacitance C2 ' and the second calibration capacitance C2 ' ' is 47 μ F.
Preferably, above-mentioned the first calibration capacitance C2 ' and the second calibration capacitance C2 ' ' are ceramic condenser.
Particularly, as shown in Figure 7, above-mentioned the first contact A can comprise interconnective the first pad A1 and the second pad A2, the first pad A1 is connected in the second end of energy storage inductor L by fly line, the second pad A2 is connected to the first end of storage capacitor and the first end of the first resistance R 1 by fly line, and under this structure, current detecting probe detects electric current on the fly line between the first pad A1 and the first end of storage capacitor.The first contact A is divided into the first pad A1 and the second pad A2 to be convenient to respectively and different fly line welding.
The electric current detecting method of this DC-DC power-supply device is same as the previously described embodiments, does not repeat them here.
DC-DC power-supply device in the present embodiment, by current waveform calibrating installation, be connected with the corresponding of DC-DC power supply on pcb board, make to detect electric current for the electric current through shaping calibration, therefore detect the actual output current that electric current approaches this DC-DC power supply more, and without increase extra device on original pcb board, can not damage pcb board, can judge convenient and accurately whether the output current of DC-DC power supply meets the condition of its current effective value yet.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (6)
1. an electric current detecting method for DC-DC power-supply device, is characterized in that, described DC-DC power-supply device comprises current waveform calibrating installation and is arranged at the DC-DC power supply on pcb board;
Described DC-DC power supply comprises:
DC-DC chip;
Energy storage inductor, the first end of described energy storage inductor is connected in the output of described DC-DC chip;
Storage capacitor, the first end of described storage capacitor is connected in the second end of described energy storage inductor and the output of described DC-DC power supply, the second end ground connection of described storage capacitor;
The first resistance, the first end of described the first resistance is connected in the output of described DC-DC power supply, and the second end of described the first resistance is connected in the feedback end of described DC-DC chip;
The second resistance, the first end of described the second resistance is connected in the feedback end of described DC-DC chip, the second end ground connection of described the second resistance;
Described current waveform calibrating installation comprises calibration capacitance, the first contact and the second contact, and the first end of described calibration capacitance is connected in described the first contact, and the second end of described calibration capacitance is connected in described the second contact;
The electric current detecting method of described DC-DC power-supply device comprises:
By the second end perk of described energy storage inductor and the first end of described storage capacitor and the disconnection of the output of described DC-DC power supply, and the second end of described energy storage inductor is connected in to described the first contact by fly line;
The output of the first end perk of described the first resistance and described DC-DC power supply is disconnected, and the first end of described the first resistance is connected in to described the first contact by fly line;
The first end of described storage capacitor is connected in to described the first contact by fly line;
Fly line ground connection is passed through in described the second contact;
Described DC-DC power-supply device work, and use current detecting probe to detect electric current on the fly line between described the first contact and the first end of described storage capacitor.
2. a DC-DC power-supply device, is characterized in that, comprising: current waveform calibrating installation and be arranged at the DC-DC power supply on pcb board;
Described DC-DC power supply comprises:
DC-DC chip;
Energy storage inductor, the first end of described energy storage inductor is connected in the output of described DC-DC chip, the second end perk of described energy storage inductor;
Storage capacitor, the first end of described storage capacitor is connected in the output of described DC-DC power supply, the second end ground connection of described storage capacitor;
The first resistance, the first end perk of described the first resistance, the second end of described the first resistance is connected in the feedback end of described DC-DC chip;
The second resistance, the first end of described the second resistance is connected in the feedback end of described DC-DC chip, the second end ground connection of described the second resistance;
Described current waveform calibrating installation comprises calibration capacitance, the first contact and the second contact, the first end of described calibration capacitance is connected in described the first contact, the second end of described calibration capacitance is connected in described the second contact, described the first contact is connected to the second end, the first end of described the first resistance and the first end of described storage capacitor of described energy storage inductor by fly line, described the second contact is by fly line ground connection.
3. DC-DC power-supply device according to claim 2, is characterized in that,
Described storage capacitor comprises the first storage capacitor and the second storage capacitor in parallel, the first end of described the first storage capacitor and the second storage capacitor is all connected in described the first contact by fly line, the equal ground connection of the second end of described the first storage capacitor and the second storage capacitor;
Described calibration capacitance comprises the first calibration capacitance and the second calibration capacitance in parallel, the first end of described the first calibration capacitance and the second calibration capacitance is all connected in described the first contact, and the second end of described the first calibration capacitance and the second calibration capacitance is all connected in described the second contact.
4. DC-DC power-supply device according to claim 3, is characterized in that,
The capacitance of described the first calibration capacitance and the second calibration capacitance is 47 μ F.
5. DC-DC power-supply device according to claim 4, is characterized in that,
Described the first calibration capacitance and the second calibration capacitance are ceramic condenser.
6. according to the DC-DC power-supply device described in any one in claim 2 to 5, it is characterized in that,
Described the first contact comprises interconnective the first pad and the second pad, described the first pad is connected in the second end of described energy storage inductor by fly line, described the second pad is connected to the first end of described storage capacitor and the first end of described the first resistance by fly line.
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| CN201310616031.5A CN103647445B (en) | 2013-11-27 | 2013-11-27 | DC-DC power source equipment and electric current detecting method thereof |
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| CN201310616031.5A CN103647445B (en) | 2013-11-27 | 2013-11-27 | DC-DC power source equipment and electric current detecting method thereof |
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| CN108375743A (en) * | 2018-04-16 | 2018-08-07 | 三峡大学 | A kind of signal acquiring system of charged current monitoring function |
| CN109496057A (en) * | 2018-11-12 | 2019-03-19 | 晶晨半导体(上海)股份有限公司 | A kind of printed circuit board layout |
| CN109752668A (en) * | 2018-12-06 | 2019-05-14 | 兰州空间技术物理研究所 | A kind of negative pressure output DC/DC converter with positive pressure telemetering |
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| CN109496057A (en) * | 2018-11-12 | 2019-03-19 | 晶晨半导体(上海)股份有限公司 | A kind of printed circuit board layout |
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| CN103647445B (en) | 2015-12-02 |
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