CN103647445B - DC-DC power source equipment and electric current detecting method thereof - Google Patents
DC-DC power source equipment and electric current detecting method thereof Download PDFInfo
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- CN103647445B CN103647445B CN201310616031.5A CN201310616031A CN103647445B CN 103647445 B CN103647445 B CN 103647445B CN 201310616031 A CN201310616031 A CN 201310616031A CN 103647445 B CN103647445 B CN 103647445B
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Abstract
The invention discloses a kind of DC-DC power source equipment and electric current detecting method thereof, relate to power technique fields, can be convenient and judge whether the output current of DC-DC power source meets the condition of its current effective value accurately.The electric current detecting method of this DC-DC power source equipment comprises: tilted by the second end of described energy storage inductor and disconnect with the first end of described storage capacitor and the output of described DC-DC power source, and the second end of described energy storage inductor is connected to described first contact by fly line; The first end of described first resistance is tilted and disconnects with the output of described DC-DC power source, and the first end of described first resistance is connected to described first contact by fly line; The first end of described storage capacitor is connected to described first contact by fly line; By described second contact by fly line ground connection; Described DC-DC power source equipment work, and the fly line using current detecting to pop one's head between described first contact and the first end of described storage capacitor detects electric current.
Description
Technical field
The present invention relates to power technique fields, particularly relate to a kind of DC-DC power source equipment 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 what router, switch, speech ciphering equipment etc. were a large amount of applies to various occasion, and people it is also proposed higher requirement for the stability of electronic equipment.At present, the printed circuit board (PCB) (PrintedCircuitBoard, PCB) in electronic equipment is often provided with DC-DC (DirectCurrent-DirectCurrent, DC-DC) power supply, this DC-DC power source is used for powering for device.Can DC-DC power source normally work very large to the stability influence of electronic equipment, therefore, in order to DC-DC power source can normally work, need to test the actual output current of DC-DC power source, ensure that the actual output current of DC-DC power source meets the condition of its current effective value.
Because DC-DC power source is arranged on pcb board, therefore cannot direct-detection, as shown in Figure 1, current DC-DC power source 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 source, the output SW of DC-DC chip 1 is connected to energy storage inductor L, and the feedback end VFB of DC-DC chip 1 is connected to 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 source comprises two kinds, the first is the top layer wiring also series conductor cutting off DC-DC power source output end vo ut place, use probe cooperation oscilloscope detects the electric current on this wire, but this method is only applicable to DC-DC power source output cabling when pcb board top layer, and the process cutting off cabling easily causes pcb board to damage; The second tilts unsettled and series conductor receives one end storage capacitor C being used for connecting energy storage inductor L by the output of energy storage inductor L, use probe cooperation oscilloscope detects the electric current on this wire, but because this detection electric current is not through reforming process that storage capacitor C and feedback resistance R coordinates with DC-DC chip, therefore the error between this detection electric current and actual output current is very large, cannot accurately judge whether the output current of DC-DC power source meets the condition of its current effective value according to this detection electric current.
Summary of the invention
The invention provides a kind of DC-DC power source equipment and electric current detecting method thereof, can be convenient and judge whether the output current of DC-DC power source meets the condition of its current effective value accurately.
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 source equipment, described DC-DC power source equipment comprises current waveform calibrating installation and is arranged at the DC-DC power source on pcb board;
Described DC-DC power source comprises:
DC-DC chip;
Energy storage inductor, the first end of described energy storage inductor is connected to the output of described DC-DC chip;
Storage capacitor, the first end of described storage capacitor is connected to the second end of described energy storage inductor and the output of described DC-DC power source, the second end ground connection of described storage capacitor;
First resistance, the first end of described first resistance is connected to the output of described DC-DC power source, and the second end of described first resistance is connected to the feedback end of described DC-DC chip;
Second resistance, the first end of described second resistance is connected to the feedback end of described DC-DC chip, the second end ground connection of described 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 to described first contact, and the second end of described calibration capacitance is connected to described second contact;
The electric current detecting method of described DC-DC power source equipment comprises:
Second end of described energy storage inductor is tilted and disconnects with the first end of described storage capacitor and the output of described DC-DC power source, and the second end of described energy storage inductor is connected to described first contact by fly line;
The first end of described first resistance is tilted and disconnects with the output of described DC-DC power source, and the first end of described first resistance is connected to described first contact by fly line;
The first end of described storage capacitor is connected to described first contact by fly line;
By described second contact by fly line ground connection;
Described DC-DC power source equipment work, and the fly line using current detecting to pop one's head between described first contact and the first end of described storage capacitor detects electric current.
On the other hand, provide a kind of DC-DC power source equipment, comprising: current waveform calibrating installation and the DC-DC power source be arranged on pcb board;
Described DC-DC power source comprises:
DC-DC chip;
Energy storage inductor, the first end of described energy storage inductor is connected to the output of described DC-DC chip, and the second end of described energy storage inductor tilts;
Storage capacitor, the first end of described storage capacitor is connected to the output of described DC-DC power source, the second end ground connection of described storage capacitor;
First resistance, the first end of described first resistance tilts, and the second end of described first resistance is connected to the feedback end of described DC-DC chip;
Second resistance, the first end of described second resistance is connected to the feedback end of described DC-DC chip, the second end ground connection of described 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 to described first contact, second end of described calibration capacitance is connected to described second contact, described first contact is connected to the second end of described energy storage inductor, the first end of described first resistance and the first end of described storage capacitor by fly line, and described second contact is by fly line ground connection.
Alternatively, described storage capacitor comprises the first storage capacitor in parallel and the second storage capacitor, the first end of described first storage capacitor and the second storage capacitor is all connected to described first contact by fly line, the equal ground connection of the second end of described first storage capacitor and the second storage capacitor;
Described calibration capacitance comprises the first calibration capacitance in parallel and the second calibration capacitance, the first end of described first calibration capacitance and the second calibration capacitance is all connected to described first contact, and the second end of described first calibration capacitance and the second calibration capacitance is all connected to described second contact.
Particularly, the capacitance of described first calibration capacitance and the second calibration capacitance is 47 μ F.
Particularly, described first calibration capacitance and the second calibration capacitance are ceramic condenser.
Particularly, described first contact comprises interconnective first pad and the second pad, described first pad is connected to the second end of described energy storage inductor by fly line, and described second pad is connected to the first end of described storage capacitor and the first end of described first resistance by fly line.
DC-DC power source equipment provided by the invention and electric current detecting method thereof, by the corresponding connection of current waveform calibrating installation to DC-DC power source on pcb board, making to detect electric current is the electric current calibrated through shaping, therefore electric current is detected more close to the actual output current of this DC-DC power source, and without the need to increasing extra device on original pcb board, also can not damage pcb board, can be convenient and judge whether the output current of DC-DC power source meets the condition of its current effective value accurately.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of DC-DC power source in prior art;
Fig. 2 is the structural representation of a kind of DC-DC power source 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 source equipment in the embodiment of the present invention;
Fig. 5 is the structural representation of a kind of DC-DC power source equipment in the embodiment of the present invention;
Fig. 6 is the structural representation of another kind of DC-DC power source equipment in the embodiment of the present invention;
Fig. 7 is the structural representation of another kind of DC-DC power source equipment in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of electric current detecting method of DC-DC power source equipment, and this DC-DC power source equipment comprises current waveform calibrating installation and is arranged at the DC-DC power source on pcb board; As shown in Figure 2, this DC-DC power source comprises: DC-DC chip 1, its input IN as the input of whole DC-DC power source, its earth terminal GND ground connection; Energy storage inductor L, the first end of energy storage inductor L is connected to the output of DC-DC chip 1; The first end of storage capacitor C1, storage capacitor C1 is connected to the second end ground connection of second end of energy storage inductor L and the output end vo ut of DC-DC power source, storage capacitor C1; The first end of the first resistance R1, the first resistance R1 is connected to the output end vo ut of DC-DC power source, and second end of the first resistance R1 is connected to the feedback end VFB of DC-DC chip 1; The first end of the second resistance R2, the second resistance R2 is connected to the feedback end VFB of DC-DC chip 1, the second end ground connection of the second resistance R2; As shown in Figure 3, above-mentioned current waveform calibrating installation 2 comprises calibration capacitance C2, the first end of the first contact A and the second contact B, calibration capacitance C2 is connected to the first contact A, and second end of calibration capacitance C2 is connected to the second contact B;
As shown in Figure 4 and Figure 5, the electric current detecting method of above-mentioned DC-DC power source equipment comprises:
Step 101, second end of energy storage inductor L tilted disconnect with the first end of storage capacitor C1 and the output end vo ut of DC-DC power source, and second end of energy storage inductor L is connected to the first contact A by fly line;
Particularly, connect owing to being arranged at the inconvenient Trimmed sums of cabling in the DC-DC power source on pcb board, and the link of individual devices can tilt easily and be connected with fly line, therefore in the present embodiment, the link of individual devices is made to tilt and be connected with current waveform calibrating installation 2 by fly line.
Step 102, the first end of the first resistance R1 tilted disconnect with the output end vo ut of DC-DC power source, and the first end of the first resistance R1 is connected to the first contact A by fly line;
Step 103, the first end of storage capacitor C1 is connected to the first contact A by fly line;
Step 104, by the second contact B by fly line ground connection;
It should be noted that, step 101,102,103 and 104 is coupled together above-mentioned current waveform calibrating installation 2 and the DC-DC power source be arranged on pcb board, form DC-DC power source equipment as shown in Figure 5, so that ensuing electric current electrical measurement step, therefore step 101,102, the restriction of not time order and function order between 103 and 104.
Step 105, above-mentioned DC-DC power source equipment work, and the fly line using current detecting to pop one's head between the first contact A and the first end of storage capacitor C1 detects electric current.
Particularly, after formation DC-DC power source equipment as shown in Figure 5, the circuit of DC-DC power source does not have material change, just calibration capacitance C2 realizes energy storage effect together with storage capacitor C1, because these two feedback resistances of R1 and R2 and calibration capacitance C2 are all connected to the first contact A, therefore the electric current flowing to storage capacitor C1 first end from the first contact A is calibrated through the shaping of DC-DC chip 1, and this detection electric current is in close proximity to the actual output current of DC-DC power source.In addition, owing to being connected by fly line between the first contact A with the first end of storage capacitor C1, therefore can be carried out the detection of electric current on this fly line by the probe of the current sensing meanss such as hall device, current sensing means is connected to oscilloscope, and the waveform shown on oscilloscope by detecting 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 DC-DC power source is returned to original state, the structure namely 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 source equipment in the present embodiment, by the corresponding connection of current waveform calibrating installation to DC-DC power source on pcb board, making to detect electric current is the electric current calibrated through shaping, therefore electric current is detected more close to the actual output current of this DC-DC power source, and without the need to increasing extra device on original pcb board, also can not damage pcb board, can be convenient and judge whether the output current of DC-DC power source meets the condition of its current effective value accurately.
As shown in Figure 5, the embodiment of the present invention provides a kind of DC-DC power source equipment, comprising: current waveform calibrating installation 2 and the DC-DC power source be arranged on pcb board; This DC-DC power source comprises: DC-DC chip 1, its input IN as the input of whole DC-DC power source, its earth terminal GND ground connection; The first end of energy storage inductor L, energy storage inductor L is connected to the output SW of DC-DC chip 1, and second end of energy storage inductor L tilts; The first end of storage capacitor C1, storage capacitor C1 is connected to the output end vo ut of DC-DC power source 3, the second end ground connection of storage capacitor C1; The first end of the first resistance R1, the first resistance R1 tilts, and second end of the first resistance R1 is connected to the feedback end VFB of DC-DC chip 1; Second resistance R2, the first end of the second resistance R2 is connected to the feedback end VFB of described DC-DC chip 1, the second end ground connection of the second resistance R2; 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 to the first contact A, second end of calibration capacitance C2 is connected to the second contact B, first contact A is connected to second end of energy storage inductor L, the first end of the first resistance R1 and the first end of storage capacitor C1 by fly line, and the second contact B is by fly line ground connection.
The electric current detecting method of this DC-DC power source equipment is same as the previously described embodiments, does not repeat them here.
DC-DC power source equipment in the present embodiment, by the corresponding connection of current waveform calibrating installation to DC-DC power source on pcb board, making to detect electric current is the electric current calibrated through shaping, therefore electric current is detected more close to the actual output current of this DC-DC power source, and without the need to increasing extra device on original pcb board, also can not damage pcb board, can be convenient and judge whether the output current of DC-DC power source meets the condition of its current effective value accurately.
Particularly, as shown in Figure 6, according to the needs of DC-DC power source, above-mentioned storage capacitor C1 can comprise the first in parallel storage capacitor C1 ' and the second storage capacitor C1 "; the first storage capacitor C1 ' and the second storage capacitor C1 " first end be all connected to the first contact A by fly line, the first storage capacitor C1 ' and the second storage capacitor C1 " the equal ground connection of the second end; Above-mentioned calibration capacitance C2 can comprise the first in parallel calibration capacitance C2 ' and the second calibration capacitance C2 "; the first calibration capacitance C2 ' and the second calibration capacitance C2 " first end be all connected to the first contact A, the first calibration capacitance C2 ' and the second calibration capacitance C2 " the second end be all connected to the second contact B.Certainly, according to the different needs of DC-DC power source, above-mentioned storage capacitor C1 also can comprise three of parallel connection, the storage capacitor of four or more, and above-mentioned calibration capacitance C2 also can comprise three of parallel connection, the calibration capacitance of four or more.
Preferably, above-mentioned first calibration capacitance C2 ' and the second calibration capacitance C2 " capacitance be 47 μ F.
Preferably, above-mentioned first calibration capacitance C2 ' and the second calibration capacitance C2 " be ceramic condenser.
Particularly, as shown in Figure 7, above-mentioned first contact A can comprise interconnective first pad A1 and the second pad A2, first pad A1 is connected to second end of energy storage inductor L by fly line, second pad A2 is connected to the first end of storage capacitor and the first end of the first resistance R1 by fly line, under this structure, the fly line of current detecting probe between the first pad A1 and the first end of storage capacitor detects electric current.The first pad A1 and the second pad A2 first contact A is divided into be convenient to weld from different fly lines respectively.
The electric current detecting method of this DC-DC power source equipment is same as the previously described embodiments, does not repeat them here.
DC-DC power source equipment in the present embodiment, by the corresponding connection of current waveform calibrating installation to DC-DC power source on pcb board, making to detect electric current is the electric current calibrated through shaping, therefore electric current is detected more close to the actual output current of this DC-DC power source, and without the need to increasing extra device on original pcb board, also can not damage pcb board, can be convenient and judge whether the output current of DC-DC power source meets the condition of its current effective value accurately.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within 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 source equipment, is characterized in that, described DC-DC power source equipment comprises current waveform calibrating installation and is arranged at the DC-DC power source on pcb board;
Described DC-DC power source comprises:
DC-DC chip;
Energy storage inductor, the first end of described energy storage inductor is connected to the output of described DC-DC chip;
Storage capacitor, the first end of described storage capacitor is connected to the second end of described energy storage inductor and the output of described DC-DC power source, the second end ground connection of described storage capacitor;
First resistance, the first end of described first resistance is connected to the output of described DC-DC power source, and the second end of described first resistance is connected to the feedback end of described DC-DC chip;
Second resistance, the first end of described second resistance is connected to the feedback end of described DC-DC chip, the second end ground connection of described 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 to described first contact, and the second end of described calibration capacitance is connected to described second contact;
The electric current detecting method of described DC-DC power source equipment comprises:
Second end of described energy storage inductor is tilted and disconnects with the first end of described storage capacitor and the output of described DC-DC power source, and the second end of described energy storage inductor is connected to described first contact by fly line;
The first end of described first resistance is tilted and disconnects with the output of described DC-DC power source, and the first end of described first resistance is connected to described first contact by fly line;
The first end of described storage capacitor is connected to described first contact by fly line;
By described second contact by fly line ground connection;
Described DC-DC power source equipment work, and the fly line using current detecting to pop one's head between described first contact and the first end of described storage capacitor detects electric current.
2. a DC-DC power source equipment, is characterized in that, comprising: current waveform calibrating installation and the DC-DC power source be arranged on pcb board;
Described DC-DC power source comprises:
DC-DC chip;
Energy storage inductor, the first end of described energy storage inductor is connected to the output of described DC-DC chip, and the second end of described energy storage inductor tilts;
Storage capacitor, the first end of described storage capacitor is connected to the output of described DC-DC power source, the second end ground connection of described storage capacitor;
First resistance, the first end of described first resistance tilts, and the second end of described first resistance is connected to the feedback end of described DC-DC chip;
Second resistance, the first end of described second resistance is connected to the feedback end of described DC-DC chip, the second end ground connection of described 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 to described first contact, second end of described calibration capacitance is connected to described second contact, described first contact is connected to the second end of described energy storage inductor, the first end of described first resistance and the first end of described storage capacitor by fly line, and described second contact is by fly line ground connection.
3. DC-DC power source equipment according to claim 2, is characterized in that,
Described storage capacitor comprises the first storage capacitor in parallel and the second storage capacitor, the first end of described first storage capacitor and the second storage capacitor is all connected to described first contact by fly line, the equal ground connection of the second end of described first storage capacitor and the second storage capacitor;
Described calibration capacitance comprises the first calibration capacitance in parallel and the second calibration capacitance, the first end of described first calibration capacitance and the second calibration capacitance is all connected to described first contact, and the second end of described first calibration capacitance and the second calibration capacitance is all connected to described second contact.
4. DC-DC power source equipment according to claim 3, is characterized in that,
The capacitance of described first calibration capacitance and the second calibration capacitance is 47 μ F.
5. DC-DC power source equipment according to claim 4, is characterized in that,
Described first calibration capacitance and the second calibration capacitance are ceramic condenser.
6. DC-DC power source equipment as claimed in any of claims 2 to 5, is characterized in that,
Described first contact comprises interconnective first pad and the second pad, described first pad is connected to the second end of described energy storage inductor by fly line, and described second pad is connected to the first end of described storage capacitor and the first end of described 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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| 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 |
| CN109752668B (en) * | 2018-12-06 | 2021-03-12 | 兰州空间技术物理研究所 | Negative-pressure output DC/DC converter with positive-pressure remote measurement |
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| CN201118794Y (en) * | 2007-11-16 | 2008-09-17 | 青岛海信电器股份有限公司 | A voltage regulating circuit and TV with this voltage regulating circuit |
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| TW201106592A (en) * | 2009-08-10 | 2011-02-16 | Mstar Semiconductor Inc | DC converting circuit and method |
| CN102594125A (en) * | 2012-03-22 | 2012-07-18 | 上海市电力公司 | Secondary power supply circuit for MOA resistive current detecting system |
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| JP2009085828A (en) * | 2007-10-01 | 2009-04-23 | Hitachi Kokusai Electric Inc | Power supply circuit |
| CN201118794Y (en) * | 2007-11-16 | 2008-09-17 | 青岛海信电器股份有限公司 | A voltage regulating circuit and TV with this voltage regulating circuit |
| CN201332359Y (en) * | 2008-12-03 | 2009-10-21 | 鸿松精密科技股份有限公司 | Output voltage compensating device |
| TW201106592A (en) * | 2009-08-10 | 2011-02-16 | Mstar Semiconductor Inc | DC converting circuit and method |
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