CN101598771B - Devices and method for detecting output over-voltage protection point of power supply module - Google Patents
Devices and method for detecting output over-voltage protection point of power supply module Download PDFInfo
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- CN101598771B CN101598771B CN 200910108118 CN200910108118A CN101598771B CN 101598771 B CN101598771 B CN 101598771B CN 200910108118 CN200910108118 CN 200910108118 CN 200910108118 A CN200910108118 A CN 200910108118A CN 101598771 B CN101598771 B CN 101598771B
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Abstract
The invention discloses a device for detecting an output over-voltage protection point of a power supply module, wherein the voltage regulation end of the power supply module is connected with an output voltage sampling point; and the device comprises a circuit which is coupled to the voltage regulation end and is used for providing a gradually increasing pumping circuit flowing out from the voltage regulation end. The invention also discloses another device for detecting the output over-voltage protection point of the power supply module, wherein the voltage regulation end of the power supply module is connected with a voltage set point; and the device comprises a circuit which is coupled to the voltage regulation end and is used for providing the gradually increasing pumping circuit flowing out from the voltage regulation end. The invention also discloses a method for detecting the output over-voltage protection point of the power supply module. The devices and the method can detect the exact over-voltage protection point of the power supply module and prevent a gradually changing electric signal from introducing large jump to a control loop of the module, so the detection result is more accurate than that of the conventional method, and the possibility for misjudgment is eliminated.
Description
Technical field
The present invention relates to power module, particularly relate to the apparatus and method for detection of output over-voltage protection point of power supply module.
Background technology
Be by the method testing power supply module output over-voltage protection function at power module TRIM end (voltage-regulation end) and connecting resistance at present; whether this method can only have over-voltage protecting function by test module; but can not measure concrete protection point; and the control loop of module is introduced a bigger sudden change, may cause that module stress exceeds standard in the test process.Module with 12V is example; the over-voltage protection point of module is 14.4-16.8V; consider the discreteness of device; the test point design of actual frock will have certain surplus; need be designed into more than the 17V; it is qualified like this might over-voltage protection point to be that the module of 16.9V is mistaken for, and has the possibility of erroneous judgement.
Summary of the invention
Fundamental purpose of the present invention is exactly at the deficiencies in the prior art, is provided for detecting the apparatus and method of output over-voltage protection point of power supply module, utilizes these apparatus and method can use measuring instrument accurately to detect the output over-voltage protection point of power module.
For achieving the above object, the present invention is by the following technical solutions:
A kind of device for detection of output over-voltage protection point of power supply module; the voltage-regulation end of described power module is connected in the output voltage sampled point; it is characterized in that, described device comprise be coupled to described voltage-regulation end, be used for providing the circuit of taking out electric current that increases gradually that flows out from described voltage-regulation end.
Preferably, described circuit comprises the current source that voltage source that voltage reduces gradually or electric current increase gradually.
Described being reduced to gradually in second reduced the slow variation that lies prostrate the step voltage amount in the level time quantum.
A kind of device for detection of output over-voltage protection point of power supply module; the voltage-regulation end of described power module is connected in voltage set point; it is characterized in that described device comprises and is coupled to circuit described voltage-regulation end, that be used for providing the filling electric current that increases gradually that flows into from described voltage-regulation end.
Preferably, described circuit comprises the current source that voltage source that voltage raises gradually or electric current increase gradually.
A kind of method for detection of output over-voltage protection point of power supply module, the voltage-regulation end of described power module is connected the output voltage sampled point, it is characterized in that, said method comprising the steps of:
A. described voltage-regulation end is powered up to form the electric current of taking out from increasing gradually of flowing out of described voltage-regulation end;
B. detect the output voltage of described power module, with the voltage max that measures as output over-voltage protection point.
Preferably, among the described step a, the current source that the voltage source that employing voltage reduces gradually or electric current increase gradually powers up described voltage-regulation end.
Described being reduced to gradually in second reduced the slow variation that lies prostrate the step voltage amount in the level time quantum.
A kind of method for detection of output over-voltage protection point of power supply module, the voltage-regulation end of described power module is connected voltage set point, it is characterized in that, said method comprising the steps of:
A. described voltage-regulation end is powered up to form the filling electric current that increases gradually that flows into from described voltage-regulation end;
B. detect the output voltage of described power module, with the voltage max that measures as output over-voltage protection point.
Preferably, among the described step a, the current source that the voltage source that employing voltage raises gradually or electric current increase gradually powers up described voltage-regulation end.
Beneficial technical effects of the present invention is:
According to the present invention; be connected in the situation of output voltage sampled point for the voltage-regulation end (hereinafter to be referred as the TRIM end) of power module; the TRIM end is powered up; the voltage source that TRIM end making alive is reduced gradually or add the current source that electric current increases gradually for example; the electric current of taking out from increasing gradually of flowing out of TRIM end; at this moment; the output voltage of power module will slowly be increased to the output over-voltage protection point of module; utilize measuring instrument for example the maximal value measurement pattern of intelligence instrument detect, namely can read the actual over-voltage protection point of module.Be connected in the situation of voltage set point for the TRIM end of power module; the TRIM end is powered up; the voltage source that TRIM end making alive is raise gradually or add the current source that electric current increases gradually for example; the filling electric current that increases gradually to the inflow of TRIM end; equally; the output voltage of power module will slowly be increased to the output over-voltage protection point of module thereupon, utilize measuring instrument for example the maximal value measurement pattern of intelligence instrument detect, can read the actual over-voltage protection point of module.Utilize apparatus and method of the present invention can measure the concrete over-voltage protection point of power module, and the electric signal of gradual change can not introduce bigger sudden change to the control loop of module, so testing result is accurate than classic method, has eliminated the possibility of erroneous judgement.
Description of drawings
Fig. 1 is the circuit theory diagrams according to a kind of embodiment of a kind of pick-up unit of the present invention;
Fig. 2 is the waveform synoptic diagram of the TRIM end impressed voltage Vset of power module among a kind of embodiment;
Fig. 3 is the waveform synoptic diagram of the output voltage V out of power module among a kind of embodiment;
Fig. 4 is for adopting the circuit theory diagrams of baric flow transducer for realization impressed current source among a kind of embodiment;
Fig. 5 is the circuit theory diagrams according to a kind of embodiment of another kind of pick-up unit of the present invention;
Fig. 6 is the waveform synoptic diagram of the TRIM end impressed voltage Vset of power module among a kind of embodiment;
Fig. 7 is the basic flow sheet of a kind of detection method of the present invention;
Fig. 8 is the basic flow sheet of another kind of detection method of the present invention.
Feature of the present invention and advantage will be elaborated by reference to the accompanying drawings by embodiment.
Embodiment
Fig. 1 has showed the circuit theory according to the embodiment of a kind of pick-up unit of the present invention, and this pick-up unit is for detection of the output over-voltage protection point of power module 1.As shown in Figure 1, be tested power module 1 inner structure in the square frame, wherein the TRIM of power module 1 end is connected in output voltage V out sampled point, pick-up unit comprise be coupled to the TRIM end, be used for providing the circuit of taking out electric current that increases gradually that flows out from the TRIM end.More preferably, this circuit comprises a voltage source (not shown), and this voltage source is added in the TRIM end of power module 1 by resistance R 4 with impressed voltage Vset, and this impressed voltage Vset be the slow voltage of reduction, and its work wave as shown in Figure 2.Along with the slow process that reduces of impressed voltage Vset; to there be an electric current of taking out that slowly increases to flow out module TRIM end; the output voltage V out of power module 1 will slowly increase until the module output over-voltage protection point this moment, reduce then, and its work wave as shown in Figure 3.Measure output voltage V out by measuring instrument, for example under the maximal value measurement pattern of intelligence instrument, measure, namely can read the actual over-voltage protection point of power module.
The detection principle of circuit shown in Figure 1 is as follows:
The power module that with the output voltage is 12V is example, under the adjusting of the Voltage loop of power module 1, the Trim terminal voltage equals the setting voltage Vref of voltage set point all the time, for example, setting voltage Vref is set to 2.5V, and stake resistance R2 is 5K Ω, resistance R 1 is 19K Ω, when impressed voltage Vset point was unsettled, because 4 pin of operational amplifier U3 are input as high-impedance state, the output voltage V out of module was
Therefore output voltage V out will remain 12V.In the output over-voltage protection point of testing power supply module 1, to the Trim end, impressed voltage point is applied with the impressed voltage Vset that slowly changes from 2.5V to 0V by unsettled becoming by resistance R 4 impressed voltage sources.In the process that impressed voltage Vset slowly reduces; the Voltage loop of power module 1 will be regulated output voltage V out and be equaled setting voltage Vref all the time to guarantee the Trim terminal voltage; because impressed voltage Vset slowly reduces from 2.5V; output voltage V out will raise gradually up to the module over-voltage protection point; because the Trim terminal potential is certain; then the electric current that flows through on the resistance R 2 is certain; along with the electric current that flows through on the resistance R 4 increases; the electric current that flows through on the resistance R 1 will increase; the electric current of taking out that flows out from the Trim end increases gradually; pressure drop on the resistance R 1 will become greatly, and output voltage V out will raise.When reaching over-voltage protection point, the output over-voltage protection circuit of inside modules will move, and module begins shutdown, and output voltage V out will drop.
Term " is taken out electric current " and is referred to take electric current, i.e. electric current of Liu Chuing away from the Trim end.
In different embodiment, can adopt various known modes to realize the voltage source that voltage slowly changes.For example, can control D/A conversion, the voltage that output slowly changes by CPU.Also can adopt RC filtering, with the electric signal of voltage signal filter for slowly changing of step.
According to pick-up unit of the present invention; the voltage source that is applied to tested module also can change current source into; for example in the above-described embodiments; directly add a current source that slowly increases at the TRIM end; equally; make and flow out the electric current of taking out that slowly increases from the TRIM end, output voltage V out will raise thereupon and descend after reaching over-voltage protection point gradually, finally also can reach identical effect.Slowly the design of the current source that changes has a lot of schemes, for example can be the slow electric current that changes by the voltage transition that the baric flow variator will slowly change, and a kind of simple baric flow variator as shown in Figure 4.
Fig. 5 has showed the circuit theory according to the embodiment of another pick-up unit of the present invention.As shown in Figure 5, be different with circuit shown in Figure 1, the TRIM of tested power module 1 end is connected in the voltage set point of module, and correspondingly, pick-up unit comprises and is coupled to the circuit TRIM end, that be used for providing the filling electric current that increases gradually that flows into from the TRIM end.Preferably, this circuit comprises a voltage source (not shown), and this voltage source is added in the TRIM end of power module 1 by resistance R 4 with voltage Vset, and this impressed voltage Vset be the slow voltage of rising, and its work wave as shown in Figure 6.Along with the process that impressed voltage Vset slowly raises, will there be a filling electric current that slowly increases to flow into the TRIM end, the output voltage V out of power module 1 will slowly increase up to the module output over-voltage protection point this moment, and its work wave is equally as shown in Figure 3.Measure output voltage V out by measuring instrument, namely can read the actual over-voltage protection point of power module.
Similarly; according to pick-up unit of the present invention; the voltage source that is applied to tested module also can change current source into; for example in the above-described embodiments; directly add a current source that slowly increases at the TRIM end; equally, make to flow into the filling electric current that slowly increases from the TRIM end that output voltage V out will raise thereupon and descend gradually after reaching over-voltage protection point.
Term " filling electric current " refers to that the Trim end pours into electric current, i.e. electric current of Liu Ruing.
On the other hand, the present invention also provides a kind of method for detection of output over-voltage protection point of power supply module, this method at the TRIM end of power module be connected the output voltage sampled point of module.As shown in Figure 7, this method may further comprise the steps:
TRIM end is powered up to form the electric current of taking out from increasing gradually of flowing out of TRIM end;
Detect the output voltage of power module, with the voltage max that measures as output over-voltage protection point.
In the preferred embodiment, the current source that the voltage source that employing voltage reduces gradually or electric current increase gradually powers up the TRIM end.
Described voltage reduces gradually and can for example be down to 0V by 2.5V from impressed voltage in the several seconds for reduce the slow variation of volt step voltage amount in the level time quantum in second.
Aspect another, the present invention also provides another kind of method for detection of output over-voltage protection point of power supply module, this method institute at the TRIM of power module hold the voltage set point that is connected module.As shown in Figure 8, this method may further comprise the steps:
The TRIM end is powered up to form the filling electric current that increases gradually that flows into from the TRIM end;
Detect the output voltage of power module, with the voltage max that measures as output over-voltage protection point.
In the preferred embodiment, adopt voltage gradually the current source that increases gradually of the high voltage source of falling-rising or electric current the TRIM end is powered up.
Detection method of the present invention more specifically can be implemented with reference to the full content of the embodiment of pick-up unit of the present invention, and this does not give unnecessary details one by one.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. device for detection of output over-voltage protection point of power supply module; the voltage-regulation end of described power module is connected in the output voltage sampled point; it is characterized in that; described device comprise be coupled to described voltage-regulation end, be used for providing the circuit of taking out electric current that increases gradually that flows out from described voltage-regulation end, the voltage max that described output over-voltage protection point measures for the output voltage that utilizes measuring instrument to detect described power module.
2. the device for detection of output over-voltage protection point of power supply module according to claim 1 is characterized in that, described circuit comprises the current source that voltage source that voltage reduces gradually or electric current increase gradually.
3. the device for detection of output over-voltage protection point of power supply module according to claim 2 is characterized in that, described being reduced to gradually in second reduced the slow variation that lies prostrate the step voltage amount in the level time quantum.
4. device for detection of output over-voltage protection point of power supply module; the voltage-regulation end of described power module is connected in voltage set point; it is characterized in that; described device comprises and is coupled to circuit described voltage-regulation end, that be used for providing the filling electric current that increases gradually that flows into from described voltage-regulation end, the voltage max that described output over-voltage protection point measures for the output voltage that utilizes measuring instrument to detect described power module.
5. the device for detection of output over-voltage protection point of power supply module according to claim 4 is characterized in that, described circuit comprises the current source that voltage source that voltage raises gradually or electric current increase gradually.
6. method for detection of output over-voltage protection point of power supply module, the voltage-regulation end of described power module is connected the output voltage sampled point, it is characterized in that, said method comprising the steps of:
A. described voltage-regulation end is powered up to form the electric current of taking out from increasing gradually of flowing out of described voltage-regulation end;
B. detect the output voltage of described power module, with the voltage max that measures as output over-voltage protection point.
7. the method for detection of output over-voltage protection point of power supply module according to claim 6 is characterized in that, among the described step a, the current source that the voltage source that employing voltage reduces gradually or electric current increase gradually powers up described voltage-regulation end.
8. the method for detection of output over-voltage protection point of power supply module according to claim 7 is characterized in that, described being reduced to gradually in second reduced the slow variation that lies prostrate the step voltage amount in the level time quantum.
9. method for detection of output over-voltage protection point of power supply module, the voltage-regulation end of described power module is connected voltage set point, it is characterized in that, said method comprising the steps of:
A. described voltage-regulation end is powered up to form the filling electric current that increases gradually that flows into from described voltage-regulation end;
B. detect the output voltage of described power module, with the voltage max that measures as output over-voltage protection point.
10. the method for detection of output over-voltage protection point of power supply module according to claim 9 is characterized in that, among the described step a, the current source that the voltage source that employing voltage raises gradually or electric current increase gradually powers up described voltage-regulation end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910108118 CN101598771B (en) | 2009-06-22 | 2009-06-22 | Devices and method for detecting output over-voltage protection point of power supply module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910108118 CN101598771B (en) | 2009-06-22 | 2009-06-22 | Devices and method for detecting output over-voltage protection point of power supply module |
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| Publication Number | Publication Date |
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| CN101598771A CN101598771A (en) | 2009-12-09 |
| CN101598771B true CN101598771B (en) | 2013-08-21 |
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| CN 200910108118 Expired - Fee Related CN101598771B (en) | 2009-06-22 | 2009-06-22 | Devices and method for detecting output over-voltage protection point of power supply module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104422895B (en) * | 2013-08-21 | 2018-07-27 | 鸿富锦精密工业（深圳）有限公司 | Power sensor detecting circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2773767Y (en) * | 2004-12-30 | 2006-04-19 | 华为技术有限公司 | DC constant-voltage power supply |
| CN2798109Y (en) * | 2005-01-12 | 2006-07-19 | 广凌科技股份有限公司 | Automatic DC power tester |
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2009
- 2009-06-22 CN CN 200910108118 patent/CN101598771B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2773767Y (en) * | 2004-12-30 | 2006-04-19 | 华为技术有限公司 | DC constant-voltage power supply |
| CN2798109Y (en) * | 2005-01-12 | 2006-07-19 | 广凌科技股份有限公司 | Automatic DC power tester |
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| CN101598771A (en) | 2009-12-09 |
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Owner name: POWER SUPPLY PRODUCTS (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: AIMOSHENG NETWORK ENERGY SOURCE CO LTD Effective date: 20140903 |
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Effective date of registration: 20140903 Address after: 518101 Guangdong city of Shenzhen province Baoan District Xin'an road two North 68 Street office Honglang District Industrial Park plant Patentee after: Yada Power Products (Shenzhen) Co.,Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: EMERSON NETWORK POWER Co.,Ltd. |
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