CN109217259A - It is a kind of for the feedback short circuit protection circuit of Buck and guard method - Google Patents
It is a kind of for the feedback short circuit protection circuit of Buck and guard method Download PDFInfo
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- CN109217259A CN109217259A CN201811257775.1A CN201811257775A CN109217259A CN 109217259 A CN109217259 A CN 109217259A CN 201811257775 A CN201811257775 A CN 201811257775A CN 109217259 A CN109217259 A CN 109217259A
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- voltage
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- feedback
- switch chip
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to circuit protection technical fields, disclose a kind of feedback short circuit protection circuit for Buck.Including upper power tube, with the lower power tube of upper series connection of power tubes, the partial pressure filter circuit in parallel with lower power tube, the external bleeder circuit in parallel with lower power tube, comparator I, comparator II and with door, the average voltage test point of the non-inverting input terminal connection partial pressure filter circuit of comparator I, whether the output end of the feedback voltage test point of the non-inverting input terminal connection bleeder circuit of comparator II, the comparator I and comparator II with gate coremaking piece by working on.When soft start voltage is less than reference value; actual output voltage is characterized with average voltage level, the reference voltage V1 such as fruit chip average voltage greater than setting, and feedback voltage is less than the reference voltage V2 of setting; switch chip stops output power supply, and rear class chip is protected not to be burned.The invention also discloses a kind of feedback short circuit protection methods for Buck.
Description
Technical field
It is especially a kind of for the feedback short circuit protection circuit of Buck and protection the present invention relates to circuit protection technical field
Method.
Background technique
In Switching Power Supply, when output short-circuit to ground when, we frequently with Hiccup(have the hiccups) operating mode to chip into
Row protection, the principle of Hiccup are to detect FB after soft start voltage reaches certain value (here by taking 80% reference voltage as an example)
Whether (feedback) voltage reaches 50% reference voltage, stops switch if not up to, and soft start voltage is pulled to 0V,
Then after waiting for a period of time, then soft start again, chip output short-circuit can be effectively judged in this way to ground and is protected.But
It is that in the actual environment, welding flaw sometimes will cause output feedback voltage with being shorted to, then in soft start voltage less than 80%
This during, since feedback voltage is 0 always, chip can charge to output using maximum fan-out capability, therefore
It will cause output and be substantially equal to input voltage VIN, will lead to rear class chip input voltage in this way much larger than required input voltage, make
At the damage of rear class chip.
Summary of the invention
The technical problems to be solved by the present invention are: in view of the above problems, providing a kind of for the anti-of Buck
Present short-circuit protection circuit and guard method.
The technical solution adopted by the invention is as follows: a kind of switch chip feedback short circuit protection circuit for Buck, including
Upper power tube, with the lower power tube of the upper series connection of power tubes, partial pressure filter circuit in parallel with lower power tube, in parallel with lower power tube
External bleeder circuit, comparator I, comparator II and with door, the non-inverting input terminal of the comparator I connects partial pressure filter circuit
Average voltage test point, the comparator I reverse input end connection partial pressure filter circuit provide reference voltage, the ratio
Compared with the feedback voltage test point of the non-inverting input terminal connection bleeder circuit of device II, the reverse input end connection point of the comparator II
The reference voltage that volt circuit provides, whether the output end of the comparator I and comparator II with gate coremaking piece by continuing pair
Output power supply.
Further, the partial pressure filter circuit includes first resistor, second resistance, filter resistance and capacitor I, and described
One resistance and second resistance form series circuit I, and the series circuit I and lower power tube are in parallel, the filter resistance and capacitor
Series circuit II is formed, the series circuit II is in parallel with second resistance, and the node between the resistance and capacitor is switch core
Piece average output voltage test point.
Further, the bleeder circuit includes 3rd resistor, the 4th resistance and capacitor II, the 3rd resistor and the 4th
Resistance forms series circuit III, and the series circuit III is in parallel with lower power tube, and the capacitor II and lower power tube are in parallel, described
Node between 3rd resistor and the 4th resistance is feedback voltage test point.
The invention also discloses a kind of switch chip feedback short circuit protection methods for Buck, including following procedure:
Step 1, when soft start voltage is less than reference value, the average voltage of switch chip is acquired to characterize the output of switch chip
Voltage, judges whether average voltage is greater than the reference voltage V1 of setting；
Step 2, the feedback voltage for acquiring switch chip, judges whether feedback voltage is less than the reference voltage V2 of setting；
Step 3, if average voltage is greater than the reference voltage V1 of setting, and feedback voltage is less than the reference voltage V2 of setting,
Switch chip stops output power supply.
Further, the switch chip feedback short circuit protection method for Buck, further includes following procedure: switch core
After piece stops output power supply, whether real-time monitoring soft start voltage reaches reference value；If reaching reference value, and feedback voltage
Less than the reference voltage V2 of setting, into next soft start stage.
Compared with prior art, having the beneficial effect that using technical solution of the present invention by adopting the above technical scheme, can exist
Rear class chip is protected before detecting hiccup, when soft start voltage is less than reference value, even if because welding etc. is external or interior
Portion's factor makes FB be shorted to ground, it is also ensured that switch chip output is not too high, and rear class chip is protected not to be burned.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the present invention for the switch chip feedback short circuit protection circuit of Buck.
Fig. 2 is the structural schematic diagram of switch chip in the embodiment of the present invention.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
In order to solve the problems, such as that switch chip output voltage is excessively high, as illustrated in fig. 1 and 2, a kind of switch core for Buck
Piece feedback short circuit protection circuit, including the upper power tube M1 and concatenated lower power tube M2 of upper power tube M1 and lower power tube M2 are simultaneously
The partial pressure filter circuit of connection, the external bleeder circuit in parallel with lower power tube, comparator I, comparator II and with door, the comparison
The average voltage test point of the non-inverting input terminal connection partial pressure filter circuit of device I, due to the typically no Vout pin of chip, institute
Output voltage Vout, the reverse input end of the comparator I can be characterized by the average value SW_avg of detection switch chip
Connect the reference voltage that partial pressure filter circuit provides, the feedback voltage of the non-inverting input terminal connection bleeder circuit of the comparator II
FB test point, the reference voltage that the reverse input end connection bleeder circuit of the comparator II provides, the comparator I and compares
Whether the output end of device II to output with gate coremaking piece by continuing to power.It is less than reference value in soft start voltage (to join here
Value is examined by taking 80% reference voltage as an example) this during, the average value SW_avg of detection switch chip, and with reference electricity
Pressure V1 is compared, and detection feedback voltage FB is compared with reference voltage V2, as SW_avg>V1 and FB<V2, stops core
Piece switch Stop_switch；If reaching reference value, and feedback voltage is less than the reference voltage V2 of setting, entrance is next
The soft start stage.
Preferably, the partial pressure filter circuit includes first resistor R1, second resistance R2, filter resistance R and capacitor I, institute
First resistor R1 and second resistance R2 composition series circuit I is stated, the series circuit I and lower power tube M2 are in parallel, the filtering
Resistance R and capacitor form series circuit II, and the series circuit II is in parallel with second resistance, the section between the resistance and capacitor
Point is switch chip average voltage SW_avg test point.Partial pressure filter circuit setting is held in the chip.
Preferably, the bleeder circuit includes 3rd resistor R3, the 4th resistance R4 and capacitor II, the 3rd resistor R3 and
4th resistance R4 forms series circuit III, and the series circuit III is in parallel with lower power tube, and the capacitor II and lower power tube are simultaneously
Connection, the node between the 3rd resistor and the 4th resistance are feedback voltage test point.Bleeder circuit is arranged outside switch chip
It connects on circuit.
Wherein connect upper end power tube and lower power pipe that upper power tube M1 and lower power tube M2 is Buck.First resistor
R1, second resistance R2 are the resistance for filtering partial pressure, and R3, R4 are external FB divider resistance.After switch chip is started to work,
In a short time, the average value of the height chip of switch chip signal can pass through the partial pressure electricity of first resistor R1, second resistance R2
Resistance produces and exports the average voltage SW_avg of voltage Vout equal proportion, therefore can be reflected by SW_avg actual defeated
Voltage swing out.And feedback voltage FB is produced by partial pressure 3rd resistor R3, the direct pressure-dividing output voltage Vout of the 4th resistance R4
Raw voltage.
Since average voltage SW_avg can react the size of output voltage Vout, so SW_avg=Vout/K1, and it is anti-
Feedthrough voltage FB=Vout/K2, wherein K1=R2/ (R1+R2), K2=R4/ (R3+R4)
Therefore there is formula SW_avg*K1=FB*K2 under normal circumstances, but when FB is shorted to ground, the formula is invalid,
Consider the influence that error generates, FB*K2 < SW_avg*K1*1.4 < Vmax*1.4, then it is assumed that FB short circuit, 1.4 be to avoid various mistakes
Inaccuracy caused by difference and set a ratio value.And as SW_avg=V1 and FB=V2, system judge for FB it is short
When road selects reference voltage V1 and V2 therefore, there are the following conditions: V2*K2 < V1*K1*1.4.
A kind of switch chip feedback short circuit protection method for Buck, including following procedure:
Step 1, when soft start voltage is less than reference value (herein with reference to value by taking 80% reference voltage as an example), switch core is acquired
The average voltage of piece characterizes the output voltage of switch chip, judges whether average voltage is greater than the reference voltage V1 of setting；Step
Rapid 2, the feedback voltage of switch chip is acquired, judges whether feedback voltage is less than the reference voltage V2 of setting；Step 3, if it is flat
Equal voltage is greater than the reference voltage V1 of setting, and feedback voltage is less than the reference voltage V2 of setting, and switch chip stops output
Power supply.Guarantee that switch chip output is not too high, rear class chip is protected not to be burned.
Preferably, the switch chip feedback short circuit protection method for Buck, further includes following procedure: switch chip
After stopping output power supply, whether real-time monitoring soft start voltage reaches reference value；If reaching reference value, and feedback voltage is small
In the reference voltage V2 of setting, into next soft start stage.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.If this
Field technical staff is altered or modified not departing from the unsubstantiality that spirit of the invention is done, should belong to power of the present invention
The claimed range of benefit.
Claims (5)
1. a kind of switch chip feedback short circuit protection circuit for Buck, which is characterized in that including upper power tube and upper power
Manage concatenated lower power tube, the partial pressure filter circuit in parallel with lower power tube, the external bleeder circuit in parallel with lower power tube, ratio
Compared with device I, comparator II and with door, the comparator I non-inverting input terminal connection partial pressure filter circuit average voltage test point,
The reference voltage that the reverse input end connection partial pressure filter circuit of the comparator I provides, the homophase input of the comparator II
The feedback voltage test point of end connection bleeder circuit, the reference that the reverse input end connection bleeder circuit of the comparator II provides
Whether the output end of voltage, the comparator I and comparator II with gate coremaking piece by continuing to power to output.
2. being used for the switch chip feedback short circuit protection circuit of Buck as described in claim 1, which is characterized in that the filtering
Bleeder circuit includes first resistor, second resistance, filter resistance and capacitor I, and the first resistor and second resistance composition are connected
Circuit I, the series circuit I and lower power tube are in parallel, and the filter resistance and capacitor form series circuit II, the series electrical
Road II is in parallel with second resistance, and the node between the resistance and capacitor is switch chip average output voltage test point.
3. being used for the switch chip feedback short circuit protection circuit of Buck as claimed in claim 2, which is characterized in that the partial pressure
Circuit includes 3rd resistor, the 4th resistance and capacitor II, and the 3rd resistor and the 4th resistance form series circuit III, the string
It is in parallel with lower power tube to join circuit III, the capacitor II and lower power tube are in parallel, between the 3rd resistor and the 4th resistance
Node is feedback voltage test point.
4. a kind of switch chip feedback short circuit protection method for Buck, which is characterized in that including following procedure:
Step 1, when soft start voltage is less than reference value, the average output voltage of switch chip is acquired to characterize switch chip
Output voltage, judges whether average voltage is greater than the reference voltage V1 of setting；
Step 2, the feedback voltage for acquiring switch chip, judges whether feedback voltage is less than the reference voltage V2 of setting；
Step 3, if average voltage is greater than the reference voltage V1 of setting, and feedback voltage is less than the reference voltage V2 of setting,
Switch chip stops output power supply.
5. being used for the switch chip feedback short circuit protection method of Buck as claimed in claim 4, which is characterized in that described to be used for
The switch chip feedback short circuit protection method of Buck, further includes following procedure: after switch chip stops output power supply, real-time monitoring
Whether soft start voltage reaches reference value；If reaching reference value, and feedback voltage is less than the reference voltage V2 of setting, enter
Next soft start stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257775.1A CN109217259A (en) | 2018-10-26 | 2018-10-26 | It is a kind of for the feedback short circuit protection circuit of Buck and guard method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257775.1A CN109217259A (en) | 2018-10-26 | 2018-10-26 | It is a kind of for the feedback short circuit protection circuit of Buck and guard method |
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| CN109217259A true CN109217259A (en) | 2019-01-15 |
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| CN201811257775.1A Pending CN109217259A (en) | 2018-10-26 | 2018-10-26 | It is a kind of for the feedback short circuit protection circuit of Buck and guard method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980607A (en) * | 2019-04-10 | 2019-07-05 | 苏州浪潮智能科技有限公司 | A kind of short-circuit protection method and device of voltage regulator circuit |
| CN112600169A (en) * | 2020-12-04 | 2021-04-02 | 西安易朴通讯技术有限公司 | Protection device, Buck circuit and control method of Buck circuit |
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