CN216052793U - Power source over-power protection system - Google Patents
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- CN216052793U CN216052793U CN202122776531.8U CN202122776531U CN216052793U CN 216052793 U CN216052793 U CN 216052793U CN 202122776531 U CN202122776531 U CN 202122776531U CN 216052793 U CN216052793 U CN 216052793U
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Abstract
The present disclosure provides a power over-power protection system, comprising: the device comprises an input voltage sampling module, a reference voltage generating module, an operational amplifying module and an over-power protection chip; one end of the input voltage sampling module is connected with the input end of the power supply to be protected, and the other end of the input voltage sampling module is connected with one end of the operational amplification module; the reference voltage generating module is connected with one end of the operational amplification module, and the other end of the operational amplification module is connected with the over-power protection chip; the input voltage sampling module collects input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generation module are input to the operational amplification module, and after the input voltage and the reference voltage are amplified by the operational amplification module, an over-current control signal is generated and drives the over-power protection chip to generate a power limiting signal so as to limit the output power of the power supply to be protected. The output power of the power supply device can be linearly adjusted according to the change of the input voltage, and the over-power protection effect on the power supply device is improved.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a power supply overpower protection system.
Background
With the continuous development of electronic technology, electronic products have been widely integrated into daily lives of people around the world, power devices are power sources of the electronic products, the power grid voltage of each country and region is different and has different heights, the power grid voltage fluctuation of many regions is large, when the power devices work in a low voltage range, the power supply efficiency is low, and if the load of the power devices is large, the heat of the power devices is large, and the power devices are damaged finally. Therefore, it is necessary to perform over-power protection on the power supply device to prevent the heat generation phenomenon caused by excessive current in the circuit due to the fact that the actual power of the power supply device exceeds the allowable maximum power.
In the conventional over-power protection mode of the power supply device, a sectional protection mode is usually adopted, and when the output power of the power supply device is higher than a preset power protection threshold, the output power of the power supply device is reduced by controlling an over-power protection pin of a protection chip through a high level, but the mode cannot linearly track the real-time power condition of the power supply, and the over-power protection effect on the power supply device is poor.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present invention is to provide a power source over-power protection system, which linearly adjusts the output power of a power source device according to the change of an input voltage, so as to improve the over-power protection effect of the power source device.
In a first aspect, an embodiment of the present application provides a power over-power protection system, where the power over-power protection system includes: the device comprises an input voltage sampling module, a reference voltage generating module, an operational amplifying module and an over-power protection chip;
one end of the input voltage sampling module is connected with the input end of the power supply to be protected, and the other end of the input voltage sampling module is connected with one end of the operational amplification module;
the reference voltage generating module is connected with one end of the operational amplifying module, and the other end of the operational amplifying module is connected with the over-power protection chip;
the input voltage sampling module collects input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generation module are input to the operational amplification module, and after the input voltage and the reference voltage are amplified by the operational amplification module, an over-current control signal is generated and drives the over-power protection chip to generate a power limiting signal so as to limit the output power of the power supply to be protected.
With reference to the first aspect, an embodiment of the present application provides a first possible implementation manner of the first aspect, where the input voltage sampling module includes: the voltage divider unit, the rectifier filter unit and the voltage acquisition terminal;
the voltage acquisition terminal, the voltage division unit and the rectification filter unit are sequentially connected;
one end of the rectifying and filtering unit is connected with the operational amplification module.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present application provides a second possible implementation manner of the first aspect, where the voltage dividing unit includes a first resistor, a second resistor, and a third resistor;
one end of the first resistor is connected with the voltage acquisition terminal, and the other end of the first resistor is connected with one end of the second resistor;
the other end of the second resistor is connected with the rectifying and filtering unit;
one end of the third resistor is connected to the second resistor and one end of the rectifying and filtering unit, and the other end of the third resistor is grounded.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present application provides a third possible implementation manner of the first aspect, where the rectifying and filtering unit includes: a first diode and a filter capacitor;
the anode of the first diode is connected with the voltage division unit, and the cathode of the first diode is connected with the operational amplification module;
one end of the filter capacitor is connected with the cathode of the first diode, and the other end of the filter capacitor is grounded.
With reference to the first aspect, an embodiment of the present application provides a fourth possible implementation manner of the first aspect, where the operational amplification module includes: an operational amplifier, a fourth resistor, a second diode, and a signal output terminal;
the inverting input end of the operational amplifier is connected with the input voltage sampling module, and the non-inverting input end of the operational amplifier is connected with the reference voltage generating module;
the output end of the operational amplifier is connected with the anode of the second diode, and the cathode of the second diode is connected with the signal output terminal;
the positive power supply end of the operational amplifier is connected with the reference voltage generation module, and the negative power supply end of the operational amplifier is grounded;
one end of the fourth resistor is connected with the anode of the second diode, and the other end of the fourth resistor is connected with the inverting input end of the operational amplifier;
the signal output terminal is connected with the over-power protection chip.
With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present application provides a fifth possible implementation manner of the first aspect, where the reference voltage generating module includes a power supply terminal, a fifth resistor, and a controllable precision regulator;
one end of the fifth resistor is connected with the power supply terminal, and the other end of the fifth resistor is connected with a reference electrode of the controllable precision voltage-stabilizing source;
the cathode of the controllable precise voltage-stabilizing source is connected with the positive phase input end of the operational amplifier, and the anode of the controllable precise voltage-stabilizing source is grounded;
the power supply terminal is connected with a positive power supply end of the operational amplifier.
With reference to the first aspect, an embodiment of the present application provides a sixth possible implementation manner of the first aspect, where the power source over-power protection system further includes a sixth resistor;
one end of the sixth resistor is connected with the input voltage sampling module, and the other end of the sixth resistor is connected with the operational amplification module.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present application provides a seventh possible implementation manner of the first aspect, and one end of the voltage acquisition terminal is connected between the power supply to be protected and the grid commercial power.
With reference to the fifth possible implementation manner of the first aspect, the present application provides an eighth possible implementation manner of the first aspect, and a voltage value of the reference voltage generated by the cathode of the controllable precision voltage regulator is 2.5V.
With reference to the fifth possible implementation manner of the first aspect, the present application provides a ninth possible implementation manner of the first aspect, and the controllable precision voltage regulator source is of a model number TL 431.
An embodiment of the present application provides a power supply overpower protection system, includes: the device comprises an input voltage sampling module, a reference voltage generating module, an operational amplifying module and an over-power protection chip; one end of the input voltage sampling module is connected with the input end of the power supply to be protected, and the other end of the input voltage sampling module is connected with one end of the operational amplification module; the reference voltage generating module is connected with one end of the operational amplification module, and the other end of the operational amplification module is connected with the over-power protection chip; the input voltage sampling module collects input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generation module are input to the operational amplification module, and after the input voltage and the reference voltage are amplified by the operational amplification module, an over-current control signal is generated and drives the over-power protection chip to generate a power limiting signal so as to limit the output power of the power supply to be protected. The output power of the power supply device can be linearly adjusted according to the change of the input voltage, and the over-power protection effect on the power supply device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a power over-power protection system according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a power over-power protection system according to an embodiment of the present invention;
fig. 3 is a third schematic structural diagram of a power over-power protection system according to an embodiment of the present invention;
fig. 4 is a fourth schematic structural diagram of a power over-power protection system according to an embodiment of the present invention.
Icon: 100-power source over-power protection system; 110-input voltage sampling module; 111-a voltage dividing unit; 1111-a first resistance; 1112-a second resistance; 1113-third resistance; 1121 — a first diode; 1122-filter capacitance; 112-a rectifying and filtering unit; 113-voltage acquisition terminals; 120-a reference voltage generation module; 121-a power supply terminal; 122-fifth resistance; 123-controllable precise voltage-stabilizing source; 130-operation amplification module; 131-an operational amplifier; 132-a fourth resistance; 133-a second diode; 134-signal output terminals; 140-over-power protection chip; 150-sixth resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention conventionally put into use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used merely for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the equipment or elements referred to 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, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be 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 in specific cases to those skilled in the art.
Considering that in the conventional over-power protection mode of the power supply device, a segmented protection mode is usually adopted, and when the output power of the power supply device is higher than a preset power protection threshold, the output power of the power supply device is reduced by controlling an over-power protection pin of a protection chip at a high level, but the mode cannot linearly track the real-time power condition of the power supply, and has a poor over-power protection effect on the power supply device.
An embodiment of the present application provides a power supply overpower protection system, includes: the device comprises an input voltage sampling module, a reference voltage generating module, an operational amplifying module and an over-power protection chip; one end of the input voltage sampling module is connected with the input end of the power supply to be protected, and the other end of the input voltage sampling module is connected with one end of the operational amplification module; the reference voltage generating module is connected with one end of the operational amplification module, and the other end of the operational amplification module is connected with the over-power protection chip; the input voltage sampling module collects input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generation module are input to the operational amplification module, and after the input voltage and the reference voltage are amplified by the operational amplification module, an over-current control signal is generated and drives the over-power protection chip to generate a power limiting signal so as to limit the output power of the power supply to be protected. The output power of the power supply device can be linearly adjusted according to the change of the input voltage, and the over-power protection effect on the power supply device is improved.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power source overpower protection system 100 provided in the present embodiment:
as shown in fig. 1, the present embodiment provides a power source over-power protection system 100, which includes: the circuit comprises an input voltage sampling module 110, a reference voltage generating module 120, an operational amplifying module 130 and an over-power protection chip 140.
Here, one end of the input voltage sampling module 110 is connected to an input end of the power supply to be protected, and the other end of the input voltage sampling module 110 is connected to one end of the operational amplification module 130; the reference voltage generating module 120 is connected to one end of the operational amplifier module 130, and the other end of the operational amplifier module 130 is connected to the over-power protection chip 140.
Here, the input voltage sampling module 110 collects an input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generating module 120 are input to the operational amplifying module 130, and after being amplified by the operational amplifying module 130, an over-current control signal is generated, and the over-current control signal drives the over-power protection chip 140 to generate a power limiting signal to limit the output power of the power source to be protected.
The power supply to be protected is a power supply device, can be used for supplying power to electronic products and the like, and is connected between the mains supply of the power grid and the electronic products, and the input voltage collected by the input voltage sampling module 110 can be a mains supply voltage signal input to the power supply to be protected.
As a possible implementation, the operational amplifier module 130 is connected to an over-current detection pin of the over-power protection chip 140.
Specifically, the input voltage signal input to the power supply to be protected, which is collected by the input voltage sampling module 110, is subjected to voltage division, rectification, filtering and the like by the input voltage sampling module 110 itself, and then the processed input voltage signal is transmitted to the operational amplification module 130. The reference voltage generating module 120 generates a reference voltage signal having a voltage value of a preset voltage threshold, and inputs the reference voltage signal to the operational amplifying module 130. After receiving the input voltage signal transmitted by the input voltage sampling module 110 and the reference voltage signal generated by the reference voltage generating module 120, the operational amplification module 130 generates an over-current control signal through operational amplification, transmits the over-current control signal to the over-current detection pin of the over-power protection chip 140, and drives the over-power protection chip 140 to control the output power of the power source to be protected according to the over-current control signal output power limiting signal.
The overcurrent control signal may be a linear voltage signal, the magnitude of which increases with the decrease of the input voltage signal, and when the voltage value corresponding to the overcurrent control signal is higher, the overpower protection chip 140 controls the lower the overcurrent protection point of the power supply to be protected, the lower the current limiting point, and further the lower the maximum output power of the power supply to be protected is.
In this way, the over-power protection chip 140 controls the maximum output power of the power to be protected to be reduced along with the reduction of the input voltage signal collected by the input voltage sampling module 110, so as to implement linear over-power protection for the power to be protected, and prevent the power to be protected from carrying a large load when the input voltage signal is low, which leads to a high output power and causes a damage problem caused by an over-high temperature of the power to be protected.
An embodiment of the present application provides a power supply overpower protection system, includes: the device comprises an input voltage sampling module, a reference voltage generating module, an operational amplifying module and an over-power protection chip; one end of the input voltage sampling module is connected with the input end of the power supply to be protected, and the other end of the input voltage sampling module is connected with one end of the operational amplification module; the reference voltage generating module is connected with one end of the operational amplification module, and the other end of the operational amplification module is connected with the over-power protection chip; the input voltage sampling module collects input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generation module are input to the operational amplification module, and after the input voltage and the reference voltage are amplified by the operational amplification module, an over-current control signal is generated and drives the over-power protection chip to generate a power limiting signal so as to limit the output power of the power supply to be protected. The output power of the power supply device can be linearly adjusted according to the change of the input voltage, and the over-power protection effect on the power supply device is improved.
Referring to fig. 2, fig. 2 is a second schematic structural diagram of a power over-power protection system 100 according to the present embodiment:
as shown in fig. 2, the present embodiment provides a power source over-power protection system 100, which includes: the circuit comprises an input voltage sampling module 110, a reference voltage generating module 120, an operational amplifying module 130 and an over-power protection chip 140. The input voltage sampling module 110 includes: a voltage dividing unit 111, a rectifying and filtering unit 112 and a voltage collecting terminal 113. The voltage divider 111 includes a first resistor 1111, a second resistor 1112, and a third resistor 1113. The rectifying and filtering unit 112 includes: a first diode 1121 and a filter capacitor 1122.
Here, the voltage collecting terminal 113, the voltage dividing unit 111, and the rectifying and filtering unit 112 are connected in sequence; one end of the rectifying and filtering unit 112 is connected to the operational amplifier module 130. One end of the first resistor 1111 is connected to the voltage acquisition terminal 113, and the other end of the first resistor 1111 is connected to one end of the second resistor 1112; the other end of the second resistor 1112 is connected with the rectifying and filtering unit 112; one end of the third resistor 1113 is connected to the second resistor 1112 and one end of the rectifying and smoothing unit 112, and the other end of the third resistor 1113 is grounded. An anode of the first diode 1121 is connected to the voltage dividing unit 111, and a cathode of the first diode 1121 is connected to the operational amplification module 130; one end of the filter capacitor 1122 is connected to the cathode of the first diode 1121, and the other end of the filter capacitor 1122 is grounded.
The voltage acquisition terminal 113 is used for acquiring an input voltage signal of a power supply to be protected, one end of the voltage acquisition terminal 113 is connected between the power supply to be protected and a mains supply of a power grid, and the other end of the voltage acquisition terminal is connected with the first resistor 1111.
In a specific implementation, the first resistor 1111, the second resistor 1112 and the third resistor 1113 are configured to divide the input voltage signal collected by the voltage collecting terminal 113 to reduce the voltage value of the input voltage signal. The first diode 1121 and the filter capacitor 1122 are used for filtering and rectifying the input voltage signal after voltage division processing, so as to correct the voltage waveform of the input voltage signal and reduce adverse factors such as harmonic carried therein.
The resistance values of the first resistor 1111, the second resistor 1112 and the third resistor 1113 may be selected according to actual needs, and are not limited herein.
An embodiment of the present application provides a power supply overpower protection system, includes: the device comprises an input voltage sampling module, a reference voltage generating module, an operational amplifying module and an over-power protection chip; one end of the input voltage sampling module is connected with the input end of the power supply to be protected, and the other end of the input voltage sampling module is connected with one end of the operational amplification module; the reference voltage generating module is connected with one end of the operational amplification module, and the other end of the operational amplification module is connected with the over-power protection chip; the input voltage sampling module collects input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generation module are input to the operational amplification module, and after the input voltage and the reference voltage are amplified by the operational amplification module, an over-current control signal is generated and drives the over-power protection chip to generate a power limiting signal so as to limit the output power of the power supply to be protected. The output power of the power supply device can be linearly adjusted according to the change of the input voltage, and the over-power protection effect on the power supply device is improved.
Further, referring to fig. 3, fig. 3 is a third schematic structural diagram of a power over-power protection system 100 according to an embodiment of the present invention.
As shown in fig. 3, the present embodiment provides a power source over-power protection system 100, which includes: the circuit comprises an input voltage sampling module 110, a reference voltage generating module 120, an operational amplifying module 130 and an over-power protection chip 140. The input voltage sampling module 110 includes: a voltage dividing unit 111, a rectifying and filtering unit 112 and a voltage collecting terminal 113. The voltage divider 111 includes a first resistor 1111, a second resistor 1112, and a third resistor 1113. The rectifying and filtering unit 112 includes: a first diode 1121 and a filter capacitor 1122. The operational amplification module 130 includes: an operational amplifier 131, a fourth resistor 132, a second diode 133, and a signal output terminal 134.
Here, the inverting input terminal of the operational amplifier 131 is connected to the input voltage sampling module 110, and the non-inverting input terminal of the operational amplifier 131 is connected to the reference voltage generating module 120; an output terminal of the operational amplifier 131 is connected to an anode of the second diode 133, and a cathode of the second diode 133 is connected to the signal output terminal; the positive power supply end of the operational amplifier 131 is connected with the reference voltage generation module 120, and the negative power supply end of the operational amplifier 131 is grounded; one end of the fourth resistor 132 is connected to the anode of the second diode 133, and the other end of the fourth resistor 132 is connected to the inverting input terminal of the operational amplifier 131; the signal output terminal 134 is connected to the overpower-protection chip 140.
Specifically, the inverting input terminal of the operational amplifier 131 is connected to the cathode of the first diode 1121 of the input voltage sampling module 110. The signal output terminal 134 is connected to an overcurrent detection pin of the overpower protection chip 140.
The magnitude of the overcurrent control signal output by the signal output terminal 134 can be selected according to actual situations, and is not limited specifically herein.
Here, the second diode 133 is used to prevent the current of the over-power protection chip 140 from flowing backward to the operational amplification module 130.
An embodiment of the present application provides a power supply overpower protection system, includes: the device comprises an input voltage sampling module, a reference voltage generating module, an operational amplifying module and an over-power protection chip; one end of the input voltage sampling module is connected with the input end of the power supply to be protected, and the other end of the input voltage sampling module is connected with one end of the operational amplification module; the reference voltage generating module is connected with one end of the operational amplification module, and the other end of the operational amplification module is connected with the over-power protection chip; the input voltage sampling module collects input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generation module are input to the operational amplification module, and after the input voltage and the reference voltage are amplified by the operational amplification module, an over-current control signal is generated and drives the over-power protection chip to generate a power limiting signal so as to limit the output power of the power supply to be protected. The output power of the power supply device can be linearly adjusted according to the change of the input voltage, and the over-power protection effect on the power supply device is improved.
Further, referring to fig. 4, fig. 4 is a fourth schematic structural diagram of a power over-power protection system 100 according to an embodiment of the present invention.
As shown in fig. 4, the present embodiment provides a power source over-power protection system 100, which includes: the circuit comprises an input voltage sampling module 110, a reference voltage generating module 120, an operational amplifying module 130 and an over-power protection chip 140. The input voltage sampling module 110 includes: a voltage dividing unit 111, a rectifying and filtering unit 112 and a voltage collecting terminal 113. The voltage divider 111 includes a first resistor 1111, a second resistor 1112, and a third resistor 1113. The rectifying and filtering unit 112 includes: a first diode 1121 and a filter capacitor 1122. The operational amplification module 130 includes: an operational amplifier 131, a fourth resistor 132, a second diode 133, and a signal output terminal 134. The reference voltage generating module 120 includes a power supply terminal 121, a fifth resistor 122 and a controllable precision regulator 123. The power overpower protection system 100 also includes a sixth resistor 150.
Here, one end of the fifth resistor 122 is connected to the power supply terminal 121, and the other end of the fifth resistor 122 is connected to the reference pole R of the controllable precision regulator 123; the cathode K of the controllable precise voltage-stabilizing source 123 is connected with the positive phase input end of the operational amplifier 131; the anode A of the controllable precise voltage-stabilizing source 123 is grounded; the power supply terminal 121 is connected to a positive power supply terminal of the operational amplifier 131. One end of the sixth resistor 150 is connected to the input voltage sampling module 110, and the other end of the sixth resistor 150 is connected to the operational amplifier module 130.
Specifically, one end of the sixth resistor 150 is connected to the inverting input terminal of the operational amplifier 131, and the other end of the sixth resistor 150 is connected to the cathode of the first diode 1121. The power supply terminal 121 is configured to supply power to the operational amplifier 131 and the controllable precision voltage regulator 123, and the controllable precision voltage regulator 123 is configured to output a reference voltage with a voltage value equal to a preset voltage threshold, and input the output reference voltage to the non-inverting input terminal of the operational amplifier 131.
Preferably, the voltage value of the reference voltage for output by the controllable precision voltage regulator 123 is 2.5V. The controllable precision voltage regulator source 123 is model number TL 431.
The resistance values of the fifth resistor 122 and the sixth resistor 150 may be selected according to actual situations, and are not limited herein.
In a specific implementation, the input voltage sampling module 110, the reference voltage generating module 120, the operational amplifier 131 and the fourth resistor 132 form a negative feedback circuit. Assuming that an input voltage signal Vin acquired by the input voltage sampling module 110 is subjected to voltage division, rectification and filtering, a voltage magnitude formed at a point B (a cathode end of the first diode 1121) is V1, a voltage magnitude at a non-inverting input end C of the operational amplifier 131 is the same as a voltage magnitude at an inverting input end, and is a voltage magnitude V2 output by a cathode K of the controllable precision voltage stabilization source 123, a voltage value output at an output end D of the operational amplifier 131 is V3, an overcurrent control signal magnitude output by the signal output terminal 134 is V4, voltage drops of the first diode 1121 and the second diode 133 are V5, and the overcurrent control signal magnitude V4 output by the signal output terminal 134 is determined based on the following formula:
V1＝1.414*Vin*R3/(R1+R2+R3)-V5；
V3＝(V1-V2)*R4/R6+V2；
V4＝V3-V5。
wherein, R1, R2, R3, R4 and R5 are the resistance values of the first resistor 1111, the second resistor 1112, the third resistor 1113, the fourth resistor 132 and the sixth resistor 150, respectively; v2 is preferably 2.5V, and V5 is preferably 0.7V.
An embodiment of the present application provides a power supply overpower protection system, includes: the device comprises an input voltage sampling module, a reference voltage generating module, an operational amplifying module and an over-power protection chip; one end of the input voltage sampling module is connected with the input end of the power supply to be protected, and the other end of the input voltage sampling module is connected with one end of the operational amplification module; the reference voltage generating module is connected with one end of the operational amplification module, and the other end of the operational amplification module is connected with the over-power protection chip; the input voltage sampling module collects input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generation module are input to the operational amplification module, and after the input voltage and the reference voltage are amplified by the operational amplification module, an over-current control signal is generated and drives the over-power protection chip to generate a power limiting signal so as to limit the output power of the power supply to be protected. The output power of the power supply device can be linearly adjusted according to the change of the input voltage, and the over-power protection effect on the power supply device is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A power supply over-power protection system, characterized by: the power supply over-power protection system comprises: the device comprises an input voltage sampling module, a reference voltage generating module, an operational amplifying module and an over-power protection chip;
one end of the input voltage sampling module is connected with the input end of the power supply to be protected, and the other end of the input voltage sampling module is connected with one end of the operational amplification module;
the reference voltage generating module is connected with one end of the operational amplifying module, and the other end of the operational amplifying module is connected with the over-power protection chip;
the input voltage sampling module collects input voltage input to a power supply to be protected; the input voltage and the reference voltage generated by the reference voltage generation module are input to the operational amplification module, and after the input voltage and the reference voltage are amplified by the operational amplification module, an over-current control signal is generated and drives the over-power protection chip to generate a power limiting signal so as to limit the output power of the power supply to be protected.
2. The power source over-power protection system of claim 1, wherein the input voltage sampling module comprises: the voltage divider unit, the rectifier filter unit and the voltage acquisition terminal;
the voltage acquisition terminal, the voltage division unit and the rectification filter unit are sequentially connected;
one end of the rectifying and filtering unit is connected with the operational amplification module.
3. The power supply over-power protection system according to claim 2, wherein the voltage dividing unit comprises a first resistor, a second resistor and a third resistor;
one end of the first resistor is connected with the voltage acquisition terminal, and the other end of the first resistor is connected with one end of the second resistor;
the other end of the second resistor is connected with the rectifying and filtering unit;
one end of the third resistor is connected to the second resistor and one end of the rectifying and filtering unit, and the other end of the third resistor is grounded.
4. The power source overpower protection system of claim 2, wherein the rectification filter unit comprises: a first diode and a filter capacitor;
the anode of the first diode is connected with the voltage division unit, and the cathode of the first diode is connected with the operational amplification module;
one end of the filter capacitor is connected with the cathode of the first diode, and the other end of the filter capacitor is grounded.
5. The power supply overpower protection system of claim 1, wherein the operational amplification module comprises: an operational amplifier, a fourth resistor, a second diode, and a signal output terminal;
the inverting input end of the operational amplifier is connected with the input voltage sampling module, and the non-inverting input end of the operational amplifier is connected with the reference voltage generating module;
the output end of the operational amplifier is connected with the anode of the second diode, and the cathode of the second diode is connected with the signal output terminal;
the positive power supply end of the operational amplifier is connected with the reference voltage generation module, and the negative power supply end of the operational amplifier is grounded;
one end of the fourth resistor is connected with the anode of the second diode, and the other end of the fourth resistor is connected with the inverting input end of the operational amplifier;
the signal output terminal is connected with the over-power protection chip.
6. The power supply overpower protection system of claim 5, wherein the reference voltage generating module comprises a power supply terminal, a fifth resistor and a controllable precise voltage regulator;
one end of the fifth resistor is connected with the power supply terminal, and the other end of the fifth resistor is connected with a reference electrode of the controllable precision voltage-stabilizing source;
the cathode of the controllable precise voltage-stabilizing source is connected with the positive phase input end of the operational amplifier, and the anode of the controllable precise voltage-stabilizing source is grounded;
the power supply terminal is connected with a positive power supply end of the operational amplifier.
7. The power source over-power protection system of claim 1, further comprising a sixth resistor;
one end of the sixth resistor is connected with the input voltage sampling module, and the other end of the sixth resistor is connected with the operational amplification module.
8. The power source over-power protection system of claim 2,
one end of the voltage acquisition terminal is connected between a power supply to be protected and a power grid commercial power.
9. The power source over-power protection system of claim 6,
the voltage value of the reference voltage generated by the cathode of the controllable precise voltage-stabilizing source is 2.5V.
10. The power source over-power protection system of claim 6,
the model of the controllable precise voltage-stabilizing source is TL 431.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122776531.8U CN216052793U (en) | 2021-11-12 | 2021-11-12 | Power source over-power protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122776531.8U CN216052793U (en) | 2021-11-12 | 2021-11-12 | Power source over-power protection system |
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| CN216052793U true CN216052793U (en) | 2022-03-15 |
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