CN113839545B - Switching power supply system with overshoot suppression circuit - Google Patents
Switching power supply system with overshoot suppression circuit Download PDFInfo
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- CN113839545B CN113839545B CN202111414108.1A CN202111414108A CN113839545B CN 113839545 B CN113839545 B CN 113839545B CN 202111414108 A CN202111414108 A CN 202111414108A CN 113839545 B CN113839545 B CN 113839545B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention relates to a switching power supply system with an overshoot suppression circuit, which comprises an input external connection end, an overshoot prevention circuit, a voltage detector, an adjustable resistor, a voltage stabilizing switch, an output external connection end, an external main switch and a central control module, wherein the input external connection end is connected with the input external connection end; the voltage detector detects overshoot voltage when the external main switch is closed, and transmits a detection result to the central control module, the central control module records and analyzes the received detection result, determines the access resistance value of the adjustable resistor according to the value of the overshoot voltage, and determines the disconnection duration of the voltage stabilizing switch according to the fluctuation duration of the overshoot voltage; the voltage detector periodically detects the overshoot voltage when the external main switch is closed, and the central control module continuously adjusts the access resistance value of the adjustable resistor and the disconnection duration of the voltage stabilizing switch according to the detection result. The adjustable resistor is arranged, so that excessive voltage is dispersed through the resistor, the overshoot frequency of the voltage stabilizing diode is reduced, the loss of the voltage stabilizing diode is reduced, and the service life of the switching power supply is prolonged.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a switching power supply system with an overshoot suppression circuit.
Background
The switch power supply system is a power supply system for controlling the switch to be switched on and off and maintaining stable output voltage, a voltage stabilizing diode is often connected in an overshoot circuit, for the repeatedly switched circuit, the voltage stabilizing diode is repeatedly impacted by the overshoot circuit to cause the voltage stabilizing capability to be reduced, and the repeatedly overshooting circuit can accelerate the loss of the voltage stabilizing diode, so that the switch power supply for restraining the overshoot circuit has low service life and large loss.
Disclosure of Invention
Therefore, the invention provides a switching power supply system with an overshoot suppression circuit, which is used for overcoming the problems of low service life and large loss of a switching power supply caused by voltage regulation and control by a voltage stabilizing diode in the prior art.
To achieve the above object, a switching power supply system with an overshoot suppression circuit, comprising,
the input external connection end is used for being connected with an external power grid;
the overshoot prevention circuit is connected with the input external connection end, and a voltage stabilizing diode is arranged in the overshoot prevention circuit and used for eliminating instant overshoot voltage;
the voltage detector is arranged between the input external terminal and the overshoot protection circuit and used for detecting the fluctuation condition of the input voltage;
the adjustable resistor is arranged between the overshoot prevention circuit and the voltage detector, the resistance value of the adjustable resistor is determined by the overshoot voltage, and the access time of the adjustable resistor is determined by the fluctuation time of the overshoot voltage;
the voltage stabilizing switch is arranged between the overshoot prevention circuit and the voltage detector, is connected with the adjustable resistor in parallel, and controls the on-off of the adjustable resistor by controlling the on-off of the voltage stabilizing switch;
the output external connection end is connected with external equipment needing voltage stabilization and used for transmitting the current for eliminating overshoot to the external equipment;
the external main switch is arranged between the overshoot-proof circuit and the output external connection end and used for controlling the on-off of the externally-transmitted current;
the central control module is respectively connected with the overshoot prevention circuit, the voltage detector, the adjustable resistor and the voltage stabilizing switch; the voltage detector detects overshoot voltage when the external main switch is closed, and transmits a detection result to the central control module, the central control module records and analyzes the received detection result, determines the access resistance value of the adjustable resistor according to the value of the overshoot voltage, and determines the disconnection duration of the voltage stabilizing switch according to the fluctuation duration of the overshoot voltage; after the access resistance value of the adjustable resistor and the disconnection duration of the voltage stabilizing switch are determined, the voltage detector continues to detect the overshoot voltage when the external main switch is closed, and the central control module continuously adjusts the access resistance value of the adjustable resistor and the disconnection duration of the voltage stabilizing switch according to the detection result.
Further, before the switching power supply system is used for power supply transmission, an acceptable maximum transmission voltage value K of current to be transmitted is input into the central control module, a voltage stabilizing diode corresponding to the voltage value is connected into the overshoot prevention circuit, the adjustable resistor is at an initial position, and the voltage stabilizing switch is in a disconnected state;
when the external main switch is closed for the first time, the switch power supply system transmits the current of an external power grid to the external equipment, the voltage detector detects the voltage of the input external terminal in real time and transmits the detection result to the central control module,
the central control module integrates the received voltage information to generate a first starting voltage fluctuation graph F1, the central control module analyzes the first starting voltage fluctuation graph F1 to obtain a first starting voltage maximum value F1 and a starting voltage overshoot fluctuation time t1, and the central control module stores and records the first starting voltage maximum value F1 and the starting voltage overshoot fluctuation time t 1;
when the external master switch is closed for the second time, the voltage detector detects the voltage of the input external terminal in real time, and transmits a detection result to the central control module, the central control module integrates the received voltage information to generate a second starting voltage fluctuation graph F2, the central control module analyzes the second starting voltage fluctuation graph F2 to obtain a second starting voltage maximum value F2 and a starting voltage overshoot fluctuation duration t2, and the central control module stores and records the second starting voltage maximum value F2 and the starting voltage overshoot fluctuation duration t 2;
when the external master switch is closed for the Nth time, N is more than or equal to 3, the voltage detector detects the voltage of the input external terminal in real time and transmits a detection result to the central control module, the central control module integrates the received voltage information to generate an Nth starting voltage fluctuation graph Fn, the central control module analyzes the Nth starting voltage fluctuation graph Fn to obtain an Nth starting voltage maximum value Fn and a starting voltage overshoot fluctuation duration tn, and the central control module stores and records the Nth starting voltage maximum value Fn and the starting voltage overshoot fluctuation duration tn;
the central control module adjusts the resistance value of the adjustable resistor to be R according to f1, f2 and … fn, and determines the access duration D of the adjustable resistor according to t1, t2 and … tn;
before the external main switch is closed for the (N + 1) th time, the resistance value of the adjustable resistor is adjusted to be R, the voltage stabilizing switch is in an off state, the central control module times when the external main switch is closed for the (N + 1) th time, and the central control module controls the voltage stabilizing switch to be closed when the timing time reaches D.
Further, when calculating the resistance value R of the adjustable resistor, the central control module selects the maximum value fi among f1, f2 and … fn, the central control module calculates the resistance value R of the adjustable resistor according to f1, f2, … fn and fi,
R =（
+
）×α
wherein p = N, i =1,2, … N, m is a calculated adjustment value of fi to the resistance value R, α is a calculated compensation parameter of the resistance value R, and m is less than 1.
Further, when the external main switch is closed for the (N + 1) th time, the voltage detector detects the voltage of the input and external terminals in real time, and transmits the detection result to the central control module, the central control module integrates the received voltage information to generate a (N + 1) th starting voltage fluctuation graph Fn +1, the central control module analyzes the (N + 1) th starting voltage fluctuation graph Fn +1 to obtain a maximum value Fn +1 of the (N + 1) th starting voltage and a starting voltage overshoot fluctuation duration tn +1, the central control module adjusts the resistance value R of the next accessed adjustable resistor according to the Fn +1,
R =（ 
+
）×α
wherein p = N +1, i =1,2, … N + 1;
when the external master switch is closed for the (N + b) th time, the voltage detector detects the voltage of the input external terminal in real time and transmits the detection result to the central control module, the central control module integrates the received voltage information to generate an (N + b) th starting voltage fluctuation diagram Fn + b, the central control module analyzes the Nth starting voltage fluctuation diagram Fn + b to obtain an (N + 1) th starting voltage maximum value Fn + b and a starting voltage overshoot fluctuation duration tn + b, and the central control module adjusts the resistance value R of the next accessed adjustable resistor according to the Fn + b,
R =（ 
+
）×α
wherein p = N + b, i =1,2, … N + b, b being a positive integer.
Further, the calculation adjustment value m of the resistance value R by fi is adjusted along with the change of the p value, and the larger the p value is, the larger m is.
Furthermore, a first preset P value evaluation parameter P1, a second preset P value evaluation parameter P2, a first preset fi value m1 for calculating the resistance value R, a second preset fi value m2 for calculating the resistance value R, and a third preset fi value m3 for calculating the resistance value R, wherein P1 is less than P2, m1 is less than m2 is less than m3 are arranged in the central control module, the central control module compares P with the first preset P value evaluation parameter P1 and the second preset P value evaluation parameter P2,
when P is not more than P1, the central control module selects m1 as a calculation adjusting value m of fi for the resistance value R;
when the P is more than P1 and less than or equal to P2, the central control module selects m2 as a calculation adjusting value m of the resistance value R of fi;
and when P is larger than P2, the central control module selects m3 as a calculated adjustment value m of fi to the resistance value R.
Further, when the access duration D of the adjustable resistor is determined, the central control module selects the maximum value tj of t1, t2 and … tn, the central control module calculates the access duration D of the adjustable resistor according to t1, t2, … tn and tj,
D =（ 
+
）×β
wherein s = N, j =1,2, … N, g is a calculation adjustment value of the access duration D of the adjustable resistor by tj, β is a calculation compensation parameter of the access duration D of the adjustable resistor, and g is less than 1.
Further, when the external main switch is closed for the (N + 1) th time, the voltage detector detects the voltage of the input and external terminals in real time, the central control module adjusts the access time length D for accessing the adjustable resistor for the next time according to the tn +1,
D =（ 
+
）×β
wherein s = N +1, j =1,2, … N + 1;
when the external main switch is closed for the (N + b) th time, the central control module adjusts the access time D for accessing the adjustable resistor for the next time according to the tn + b,
D =（ 
+
）×β
where s = N + b, j =1,2, … N + b, b being a positive integer.
Further, the calculated adjustment value g of the resistance R by ti is adjusted according to the change of the value s, and the larger the value s is, the larger g is.
Furthermore, an adjusting frequency evaluation parameter Bz is arranged in the central control module, the central control module records the adjusting frequency B of the resistance value R of the adjustable resistor in real time and compares the adjusting frequency B with the adjusting frequency evaluation parameter Bz after each adjustment is completed,
when B is larger than or equal to Bz, the central control module judges that the data values of the maximum value fn + B of the collected starting voltage and the overshoot fluctuation time tn + B of the starting voltage are sufficient, new starting voltage information is not collected any more, meanwhile, the resistance value of the adjustable resistor and the access time of the adjustable resistor are not adjusted, and the resistance value of the adjustable resistor and the access time of the adjustable resistor are converted into fixed values according to the result of the adjustment for the second time;
and when B is less than Bz, the central control module judges that the data values of the maximum value fn + B of the collected starting voltage and the overshoot fluctuation time tn + B of the starting voltage are insufficient, the central control module continuously collects the maximum value of the starting voltage and the overshoot fluctuation time of the starting voltage next time, and adjusts the resistance value of the adjustable resistor and the access time of the adjustable resistor according to the collection result until B is more than or equal to Bz.
Compared with the prior art, the voltage detector has the advantages that the voltage detector detects the overshoot voltage when the external main switch is closed, the detection result is transmitted to the central control module, the central control module records and analyzes the received detection result, the access resistance value of the adjustable resistor is determined according to the value of the overshoot voltage, and the disconnection duration of the voltage stabilizing switch is determined according to the fluctuation duration of the overshoot voltage; after the access resistance value of the adjustable resistor and the disconnection duration of the voltage stabilizing switch are determined, the voltage detector continues to detect the overshoot voltage when the external main switch is closed, and the central control module continuously adjusts the access resistance value of the adjustable resistor and the disconnection duration of the voltage stabilizing switch according to the detection result. The adjustable resistor is arranged, so that excessive voltage is dispersed through the resistor, the overshoot frequency of the voltage stabilizing diode is reduced, the loss of the voltage stabilizing diode is reduced, and the service life of the switching power supply is prolonged.
Further, the resistance value of the adjustable resistor and the access time of the adjustable resistor are determined by collecting the maximum value of the starting voltage and the overshoot fluctuation time of the starting voltage for many times, the stable values of the access voltage and the access time are determined, and the working state of the external equipment is stabilized under the condition that the reasonable voltage distribution is ensured.
Further, since m < 1, so (
+
) Ratio of
The value of (2) is large, a calculation regulating value m is set during calculation, the influence of the maximum overshoot value is increased, the safety is enhanced, the overshoot times of the voltage stabilizing diode are reduced, the loss of the voltage stabilizing diode is reduced, and the service life of the switching power supply is prolonged.
Furthermore, the invention periodically detects the maximum value of the regulated starting voltage and the overshoot fluctuation time of the starting voltage to determine the resistance value of the adjustable resistor and the access time of the adjustable resistor, determines the optimal resistance value of the adjustable resistor, and stabilizes the working state of the external equipment under the condition of ensuring reasonable voltage distribution.
Further, the more data collected, the more comprehensive the data obtained, the more accurate the calculated resistance value, and when the p value is larger and m is larger, (b)
+
) And
the closer the value of the voltage is, the optimal adjustable resistance value is determined, and the working state of the external equipment is stabilized under the condition of ensuring reasonable voltage distribution.
Further, since g < 1, so (A) ((B))
+
) Ratio (a)
) The value of (2) is large, a calculation regulating value g is set during calculation, the influence of the maximum overshoot duration is increased, the safety is enhanced, the overshoot times of the voltage stabilizing diode are reduced, the loss of the voltage stabilizing diode is reduced, and the service life of the switching power supply is prolonged.
Furthermore, the invention determines the resistance value of the adjustable resistor and the access time of the adjustable resistor by periodically detecting and adjusting the maximum value of the starting voltage and the overshoot fluctuation time of the starting voltage, determines the optimal access time of the adjustable resistor, and stabilizes the working state of the external equipment under the condition of ensuring reasonable voltage distribution.
Further, the more data collected, the more complete the data acquiredThe more accurate the calculated resistance access time, the larger the value of s and the larger the value of g, and (
+
) And (a)
) The value of the voltage value is closer and closer, the optimal adjustable resistance access time is determined, and the working state of the external equipment is stabilized under the condition of ensuring reasonable voltage distribution.
Further, when the collected data reaches a certain amount, the resistance value of the adjustable resistor and the access time of the adjustable resistor cannot be adjusted due to new statistical data, and at the moment, the resistance value of the adjustable resistor and the access time of the adjustable resistor are not adjusted any more, so that the accessed resistance value is in a stable state, and the working state of the external device is stabilized.
Drawings
Fig. 1 is a schematic structural diagram of a switching power supply system with an overshoot suppression circuit according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a switching power supply system with an overshoot suppression circuit according to the present invention. The invention provides a switch power supply system with an overshoot suppression circuit, which comprises,
the input external connection end 1 is used for connecting with an external power grid;
the overshoot prevention circuit 2 is connected with the input external connection end 1, and a voltage stabilizing diode is arranged in the overshoot prevention circuit and used for eliminating instant overshoot voltage;
a voltage detector 3, disposed between the input external terminal 1 and the overshoot-prevention circuit 2, for detecting a fluctuation of the input voltage;
the adjustable resistor 4 is arranged between the overshoot-prevention circuit 1 and the voltage detector 3, the resistance value of the adjustable resistor is determined by the overshoot voltage, and the access time of the adjustable resistor is determined by the fluctuation time of the overshoot voltage;
a voltage stabilizing switch 5, which is arranged between the overshoot protection circuit 1 and the voltage detector 3, is connected in parallel with the adjustable resistor 4, and controls the on/off of the adjustable resistor 4 by controlling the on/off of the voltage stabilizing switch 5;
an output external terminal 6 connected to an external device to be stabilized for supplying the overshoot-free current to the external device;
an external main switch 7 arranged between the overshoot protection circuit 2 and the output external terminal for controlling the switching on and off of the externally-supplied current;
a central control module 8, which is connected 5 with the overshoot prevention circuit 2, the voltage detector 3, the adjustable resistor 4 and the voltage stabilizing switch respectively; the voltage detector detects overshoot voltage when the external main switch is closed, and transmits a detection result to the central control module, the central control module records and analyzes the received detection result, determines the access resistance value of the adjustable resistor according to the value of the overshoot voltage, and determines the disconnection duration of the voltage stabilizing switch according to the fluctuation duration of the overshoot voltage; after the access resistance value of the adjustable resistor and the disconnection duration of the voltage stabilizing switch are determined, the voltage detector continues to detect the overshoot voltage when the external main switch is closed, and the central control module continuously adjusts the access resistance value of the adjustable resistor and the disconnection duration of the voltage stabilizing switch according to the detection result.
The adjustable resistor is arranged, so that excessive voltage is dispersed through the resistor, the overshoot frequency of the voltage stabilizing diode is reduced, the loss of the voltage stabilizing diode is reduced, and the service life of the switching power supply is prolonged.
Specifically, before the switching power supply system is used for power supply transmission, an acceptable maximum transmission voltage value K of current to be transmitted is input to the central control module, a voltage stabilizing diode with a corresponding voltage value is connected into the overshoot prevention circuit, the adjustable resistor is at an initial position, and the voltage stabilizing switch is in a disconnected state;
when the external main switch is closed for the first time, the switch power supply system transmits the current of an external power grid to the external equipment, the voltage detector detects the voltage of the input external terminal in real time and transmits the detection result to the central control module,
the central control module integrates the received voltage information to generate a first starting voltage fluctuation graph F1, the central control module analyzes the first starting voltage fluctuation graph F1 to obtain a first starting voltage maximum value F1 and a starting voltage overshoot fluctuation time t1, and the central control module stores and records the first starting voltage maximum value F1 and the starting voltage overshoot fluctuation time t 1;
when the external master switch is closed for the second time, the voltage detector detects the voltage of the input external terminal in real time, and transmits a detection result to the central control module, the central control module integrates the received voltage information to generate a second starting voltage fluctuation graph F2, the central control module analyzes the second starting voltage fluctuation graph F2 to obtain a second starting voltage maximum value F2 and a starting voltage overshoot fluctuation duration t2, and the central control module stores and records the second starting voltage maximum value F2 and the starting voltage overshoot fluctuation duration t 2;
when the external master switch is closed for the Nth time, N is more than or equal to 3, the voltage detector detects the voltage of the input external terminal in real time and transmits a detection result to the central control module, the central control module integrates the received voltage information to generate an Nth starting voltage fluctuation graph Fn, the central control module analyzes the Nth starting voltage fluctuation graph Fn to obtain an Nth starting voltage maximum value Fn and a starting voltage overshoot fluctuation duration tn, and the central control module stores and records the Nth starting voltage maximum value Fn and the starting voltage overshoot fluctuation duration tn;
the central control module adjusts the resistance value of the adjustable resistor to be R according to f1, f2 and … fn, and determines the access duration D of the adjustable resistor according to t1, t2 and … tn;
before the external main switch is closed for the (N + 1) th time, the resistance value of the adjustable resistor is adjusted to be R, the voltage stabilizing switch is in an off state, the central control module times when the external main switch is closed for the (N + 1) th time, and the central control module controls the voltage stabilizing switch to be closed when the timing time reaches D.
The resistance value of the adjustable resistor and the access time of the adjustable resistor are determined by collecting the maximum value of the starting voltage and the overshoot fluctuation time of the starting voltage for many times, the stable values of the access voltage and the access time are determined, and the working state of the external equipment is stabilized under the condition that the reasonable voltage distribution is ensured.
Specifically, when calculating the resistance value R of the adjustable resistor, the central control module selects the maximum value fi among f1, f2, … fn, the central control module calculates the resistance value R of the adjustable resistor according to f1, f2, … fn and fi,
R =（ 
+
）×α
wherein p = N, i =1,2, … N, m is a calculated adjustment value of fi to the resistance value R, α is a calculated compensation parameter of the resistance value R, and m is less than 1.
Since m < 1, therefore
+
) Ratio of
The value of (2) is large, a calculation regulating value m is set during calculation, the influence of the maximum overshoot value is increased, the safety is enhanced, the overshoot times of the voltage stabilizing diode are reduced, the loss of the voltage stabilizing diode is reduced, and the service life of the switching power supply is prolonged.
Specifically, when the external main switch is closed for the (N + 1) th time, the voltage detector detects the voltage of the input and external terminals in real time, and transmits the detection result to the central control module, the central control module integrates the received voltage information to generate a (N + 1) th starting voltage fluctuation graph Fn +1, the central control module analyzes the (N) th starting voltage fluctuation graph Fn +1 to obtain a maximum value Fn +1 of the (N + 1) th starting voltage and a starting voltage overshoot fluctuation duration tn +1, and the central control module adjusts the resistance value R of the next accessed adjustable resistor according to the Fn +1,
R =（ 
+
）×α
wherein p = N +1, i =1,2, … N + 1;
when the external master switch is closed for the (N + b) th time, the voltage detector detects the voltage of the input external terminal in real time and transmits the detection result to the central control module, the central control module integrates the received voltage information to generate an (N + b) th starting voltage fluctuation diagram Fn + b, the central control module analyzes the Nth starting voltage fluctuation diagram Fn + b to obtain an (N + 1) th starting voltage maximum value Fn + b and a starting voltage overshoot fluctuation duration tn + b, and the central control module adjusts the resistance value R of the next accessed adjustable resistor according to the Fn + b,
R =（ 
+
）×α
wherein p = N + b, i =1,2, … N + b, b being a positive integer.
And periodically detecting the maximum value of the regulated starting voltage and the overshoot fluctuation time of the starting voltage, determining the resistance value of the adjustable resistor and the access time of the adjustable resistor, determining the optimal resistance value of the adjustable resistor, and stabilizing the working state of the external equipment under the condition of ensuring reasonable voltage distribution.
Specifically, the calculated adjustment value m of the resistance R by fi is adjusted along with the change of the p value, and the larger the p value is, the larger m is.
Specifically, a first preset P-value evaluation parameter P1, a second preset P-value evaluation parameter P2, a first preset fi calculated adjustment value m1 of the resistance value R, a second preset fi calculated adjustment value m2 of the resistance value R, and a third preset fi calculated adjustment value m3 of the resistance value R are arranged in the central control module, wherein P1 is more than P2, m1 is more than m2 and more than m3, the central control module compares P with the first preset P-value evaluation parameter P1 and the second preset P-value evaluation parameter P2,
when P is not more than P1, the central control module selects m1 as a calculation adjusting value m of fi for the resistance value R;
when the P is more than P1 and less than or equal to P2, the central control module selects m2 as a calculation adjusting value m of the resistance value R of fi;
and when P is larger than P2, the central control module selects m3 as a calculated adjustment value m of fi to the resistance value R.
The more data is collected, the more comprehensive the data is obtained, the more accurate the calculated resistance value is, when the p value is larger and m is larger, (the)
+
) And
the closer the value of the voltage is, the optimal adjustable resistance value is determined, and the working state of the external equipment is stabilized under the condition of ensuring reasonable voltage distribution.
Specifically, when the access duration D of the adjustable resistor is determined, the central control module selects the maximum value tj of t1, t2 and … tn, the central control module calculates the access duration D of the adjustable resistor according to t1, t2, … tn and tj,
D =（ 
+
）×β
wherein s = N, j =1,2, … N, g is a calculation adjustment value of the access duration D of the adjustable resistor by tj, β is a calculation compensation parameter of the access duration D of the adjustable resistor, and g is less than 1.
Since g < 1, therefore
+
) Ratio (a)
) The value of (a) is large, the calculation regulating value g is set during calculation, the influence of the maximum overshoot duration is increased,the safety is enhanced, the overshoot times of the voltage stabilizing diode are reduced, the loss of the voltage stabilizing diode is reduced, and the service life of the switching power supply is prolonged.
Specifically, when the external main switch is closed for the (N + 1) th time, the voltage detector detects the voltage of the input and external terminals in real time, the central control module adjusts the access time length D for accessing the adjustable resistor for the next time according to the tn +1,
D =（ 
+
）×β
wherein s = N +1, j =1,2, … N + 1;
when the external main switch is closed for the (N + b) th time, the central control module adjusts the access time D for accessing the adjustable resistor for the next time according to the tn + b,
D =（ 
+
）×β
where s = N + b, j =1,2, … N + b, b being a positive integer.
And periodically detecting the maximum value of the regulated starting voltage and the overshoot fluctuation time of the starting voltage, determining the resistance value of the adjustable resistor and the access time of the adjustable resistor, determining the optimal access time of the adjustable resistor, and stabilizing the working state of the external equipment under the condition of ensuring reasonable voltage distribution.
Specifically, ti adjusts the calculated adjustment value g for the resistance R as the value of s changes, with the greater the value of s, the greater g.
The more data is collected, the more comprehensive the data is obtained, the more accurate the calculated resistance access duration is, the larger the value s is, and the larger the value g is, (the)
+
) And (a)
) The value of the voltage value is closer and closer, the optimal adjustable resistance access time is determined, and the working state of the external equipment is stabilized under the condition of ensuring reasonable voltage distribution.
Specifically, an adjustment time evaluation parameter Bz is arranged in the central control module, the central control module records the adjustment time B of the resistance value R of the adjustable resistor in real time, and compares the adjustment time B with the adjustment time evaluation parameter Bz after each adjustment is completed,
when B is larger than or equal to Bz, the central control module judges that the data values of the maximum value fn + B of the collected starting voltage and the overshoot fluctuation time tn + B of the starting voltage are sufficient, new starting voltage information is not collected any more, meanwhile, the resistance value of the adjustable resistor and the access time of the adjustable resistor are not adjusted, and the resistance value of the adjustable resistor and the access time of the adjustable resistor are converted into fixed values according to the result of the adjustment for the second time;
and when B is less than Bz, the central control module judges that the data values of the maximum value fn + B of the collected starting voltage and the overshoot fluctuation time tn + B of the starting voltage are insufficient, the central control module continuously collects the maximum value of the starting voltage and the overshoot fluctuation time of the starting voltage next time, and adjusts the resistance value of the adjustable resistor and the access time of the adjustable resistor according to the collection result until B is more than or equal to Bz.
When the collected data reach a certain amount, the resistance value of the adjustable resistor and the access time of the adjustable resistor cannot be adjusted due to new statistical data, and the resistance value of the adjustable resistor and the access time of the adjustable resistor are not adjusted any more at the moment, so that the accessed resistance value is in a stable state, and the working state of the external equipment is stabilized.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A switching power supply system with an overshoot suppression circuit, comprising,
the input external connection end is used for being connected with an external power grid;
the overshoot prevention circuit is connected with the input external terminal and is used for eliminating the instantaneous overshoot voltage;
the voltage detector is arranged between the input external terminal and the overshoot protection circuit and used for detecting the fluctuation condition of the input voltage;
the adjustable resistor is arranged between the overshoot prevention circuit and the voltage detector, the resistance value of the adjustable resistor is determined by the overshoot voltage, and the access time of the adjustable resistor is determined by the fluctuation time of the overshoot voltage;
the voltage stabilizing switch is arranged between the overshoot prevention circuit and the voltage detector, is connected with the adjustable resistor in parallel, and controls the on-off of the adjustable resistor by controlling the on-off of the voltage stabilizing switch;
the output external connection end is connected with external equipment needing voltage stabilization and used for transmitting the current for eliminating overshoot to the external equipment;
the external main switch is arranged between the overshoot-proof circuit and the output external connection end and used for controlling the on-off of the externally-transmitted current;
the central control module is respectively connected with the overshoot prevention circuit, the voltage detector, the adjustable resistor and the voltage stabilizing switch; the voltage detector detects overshoot voltage when the external main switch is closed, and transmits a detection result to the central control module, the central control module records and analyzes the received detection result, determines the access resistance value of the adjustable resistor according to the value of the overshoot voltage, and determines the disconnection duration of the voltage stabilizing switch according to the fluctuation duration of the overshoot voltage; after the access resistance value of the adjustable resistor and the disconnection duration of the voltage stabilizing switch are determined, the voltage detector continues to detect the overshoot voltage when the external main switch is closed, and the central control module continuously adjusts the access resistance value of the adjustable resistor and the disconnection duration of the voltage stabilizing switch according to the detection result.
2. The switching power supply system with the overshoot suppression circuit according to claim 1, wherein before the switching power supply system is used for power supply transmission, an acceptable maximum transmission voltage value K of a current to be transmitted is input to the central control module, a voltage stabilizing diode corresponding to the voltage value is connected to the overshoot prevention circuit, the adjustable resistor is at an initial position, and the voltage stabilizing switch is in a disconnected state;
when the external main switch is closed for the first time, the switch power supply system transmits the current of an external power grid to the external equipment, the voltage detector detects the voltage of the input external terminal in real time and transmits the detection result to the central control module,
the central control module integrates the received voltage information to generate a first starting voltage fluctuation graph F1, the central control module analyzes the first starting voltage fluctuation graph F1 to obtain a first starting voltage maximum value F1 and a starting voltage overshoot fluctuation time t1, and the central control module stores and records the first starting voltage maximum value F1 and the starting voltage overshoot fluctuation time t 1;
when the external master switch is closed for the second time, the voltage detector detects the voltage of the input external terminal in real time, and transmits a detection result to the central control module, the central control module integrates the received voltage information to generate a second starting voltage fluctuation graph F2, the central control module analyzes the second starting voltage fluctuation graph F2 to obtain a second starting voltage maximum value F2 and a starting voltage overshoot fluctuation duration t2, and the central control module stores and records the second starting voltage maximum value F2 and the starting voltage overshoot fluctuation duration t 2;
when the external master switch is closed for the Nth time, N is more than or equal to 3, the voltage detector detects the voltage of the input external terminal in real time and transmits a detection result to the central control module, the central control module integrates the received voltage information to generate an Nth starting voltage fluctuation graph Fn, the central control module analyzes the Nth starting voltage fluctuation graph Fn to obtain an Nth starting voltage maximum value Fn and a starting voltage overshoot fluctuation duration tn, and the central control module stores and records the Nth starting voltage maximum value Fn and the starting voltage overshoot fluctuation duration tn;
the central control module adjusts the resistance value of the adjustable resistor to be R according to f1, f2 and … fn, and determines the access duration D of the adjustable resistor according to t1, t2 and … tn;
before the external main switch is closed for the (N + 1) th time, the resistance value of the adjustable resistor is adjusted to be R, the voltage stabilizing switch is in an off state, the central control module times when the external main switch is closed for the (N + 1) th time, and the central control module controls the voltage stabilizing switch to be closed when the timing time reaches D.
3. The switching power supply system with overshoot suppression circuit according to claim 2, wherein the central control module selects the maximum value fi among f1, f2, … fn when calculating the resistance value R of the adjustable resistor, the central control module calculates the resistance value R of the adjustable resistor according to f1, f2, … fn and fi,
R =（
+
）×α
wherein p = N, i =1,2, … N, m is a calculated adjustment value of fi to the resistance value R, α is a calculated compensation parameter of the resistance value R, and m is less than 1.
4. The switching power supply system with the overshoot suppression circuit according to claim 3, wherein the voltage detector detects the voltage across the input/output terminal in real time when the N +1 th main switch is closed, and transmits the detection result to the central control module, the central control module integrates the received voltage information to generate an N +1 th start voltage fluctuation diagram Fn +1, the central control module analyzes the N th start voltage fluctuation diagram Fn +1 to obtain an N +1 th start voltage maximum value Fn +1 and a start voltage overshoot fluctuation duration tn +1, and the central control module adjusts the resistance value R of the next access adjustable resistor according to Fn +1,
R =（ 
+
）×α
wherein p = N +1, i =1,2, … N + 1;
when the external master switch is closed for the (N + b) th time, the voltage detector detects the voltage of the input external terminal in real time and transmits the detection result to the central control module, the central control module integrates the received voltage information to generate an (N + b) th starting voltage fluctuation diagram Fn + b, the central control module analyzes the Nth starting voltage fluctuation diagram Fn + b to obtain an (N + 1) th starting voltage maximum value Fn + b and a starting voltage overshoot fluctuation duration tn + b, and the central control module adjusts the resistance value R of the next accessed adjustable resistor according to the Fn + b,
R =（ 
+
）×α
wherein p = N + b, i =1,2, … N + b, b being a positive integer.
5. The switching power supply system with the overshoot suppression circuit according to claim 4, wherein the calculated adjustment value m of the resistance R by fi is adjusted according to the change of the p value, and the larger the p value is, the larger m is.
6. The switching power supply system with overshoot suppression circuit according to claim 5, wherein a first preset P-value evaluation parameter P1, a second preset P-value evaluation parameter P2, a first preset fi-to-resistance R calculated adjustment value m1, a second preset fi-to-resistance R calculated adjustment value m2, and a third preset fi-to-resistance R calculated adjustment value m3 are provided in the central control module, wherein P1 < P2, m1 < m2 < m3, the central control module compares P with the first preset P-value evaluation parameter P1, the second preset P-value evaluation parameter P2,
when P is not more than P1, the central control module selects m1 as a calculation adjusting value m of fi for the resistance value R;
when the P is more than P1 and less than or equal to P2, the central control module selects m2 as a calculation adjusting value m of the resistance value R of fi;
and when P is larger than P2, the central control module selects m3 as a calculated adjustment value m of fi to the resistance value R.
7. The switching power supply system with overshoot suppression circuit according to claim 6, wherein the central control module selects the maximum value tj of t1, t2, … tn when determining the access duration D of the adjustable resistor, the central control module calculates the access duration D of the adjustable resistor according to t1, t2, … tn and tj,
D =（ 
+
）×β
wherein s = N, j =1,2, … N, g is a calculation adjustment value of the access duration D of the adjustable resistor by tj, β is a calculation compensation parameter of the access duration D of the adjustable resistor, and g is less than 1.
8. The switching power supply system with overshoot suppression circuit according to claim 7, wherein the voltage detector detects the voltage at the input/output terminal in real time when the N +1 th time of closing the external main switch, the central control module adjusts an access time length D for accessing the adjustable resistor next time according to tn +1,
D =（ 
+
）×β
wherein s = N +1, j =1,2, … N + 1;
when the external main switch is closed for the (N + b) th time, the central control module adjusts the access time D for accessing the adjustable resistor for the next time according to the tn + b,
D =（ 
+
）×β
where s = N + b, j =1,2, … N + b, b being a positive integer.
9. The switching power supply system with suppression of overshoot circuit according to claim 8, wherein the calculated regulation value g of the resistance R by ti is adjusted according to the change of the value s, and the larger the value s is, the larger g is.
10. The switching power supply system with overshoot suppression circuit according to claim 9, wherein the central control module is provided with an adjustment number evaluation parameter Bz, the central control module records an adjustment number B of the resistance R of the adjustable resistor in real time, and compares B with the adjustment number evaluation parameter Bz after each adjustment is completed,
when B is larger than or equal to Bz, the central control module judges that the data values of the maximum value fn + B of the collected starting voltage and the overshoot fluctuation time tn + B of the starting voltage are sufficient, new starting voltage information is not collected any more, meanwhile, the resistance value of the adjustable resistor and the access time of the adjustable resistor are not adjusted, and the resistance value of the adjustable resistor and the access time of the adjustable resistor are converted into fixed values according to the result of the adjustment for the second time;
and when B is less than Bz, the central control module judges that the data values of the maximum value fn + B of the collected starting voltage and the overshoot fluctuation time tn + B of the starting voltage are insufficient, the central control module continuously collects the maximum value of the starting voltage and the overshoot fluctuation time of the starting voltage next time, and adjusts the resistance value of the adjustable resistor and the access time of the adjustable resistor according to the collection result until B is more than or equal to Bz.
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| KR100865327B1 (en) * | 2006-12-28 | 2008-10-27 | 삼성전자주식회사 | High voltage generation circuit and method for reducing overshoot of output voltage |
| CN104953837B (en) * | 2014-03-31 | 2018-05-08 | 台达电子企业管理（上海）有限公司 | Control device and control method and Switching Power Supply for power inverter |
| CN204168147U (en) * | 2014-09-30 | 2015-02-18 | 洛阳隆盛科技有限责任公司 | A kind of circuit suppressing power input current over pulse |
| CN107734752A (en) * | 2017-10-31 | 2018-02-23 | 成都冠深科技有限公司 | A kind of flash lamp band energy-saving control system with electric current overvoltage and buffered |
| CN207559851U (en) * | 2017-12-13 | 2018-06-29 | 芝倪信息技术（大连）有限公司 | A kind of Switching Power Supply with delay start with anti-overshoot circuit |
| CN109067158B (en) * | 2018-08-21 | 2024-01-26 | 北方电子研究院安徽有限公司 | Protection circuit for eliminating starting overshoot of direct-current power supply |
| CN112039324A (en) * | 2020-07-31 | 2020-12-04 | 珠海格力电器股份有限公司 | Overvoltage protection circuit, method and device, power supply equipment and computer readable medium |
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