CN116299029A - Direct current power supply power-down detection circuit and power-down detection module - Google Patents
Direct current power supply power-down detection circuit and power-down detection module Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a direct-current power supply power-down detection circuit and a power-down detection module, wherein the direct-current power supply power-down detection circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a first diode; the non-inverting input end of the operational amplifier is grounded, the inverting input end of the operational amplifier is connected with a direct current negative power supply through a first resistor, the inverting input end of the operational amplifier is also connected with the first end of a second resistor, and the output end of the operational amplifier is connected with the cathode of a first diode; the anode of the first diode is connected with the first end of the third resistor; the first end of the fourth resistor is connected with a direct current positive power supply; the first end of the fifth resistor is grounded; the second end of the second resistor, the second end of the third resistor, the second end of the fourth resistor and the second end of the fifth resistor are all connected with the detection end of the control chip; the power failure detection module comprises the power failure detection circuit and a control chip. The invention can monitor the change of the positive power supply voltage and the negative power supply voltage at the same time, and has high detection precision.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a direct current power supply power-down detection circuit and a power-down detection module.
Background
Many electronic products need to monitor the voltage of a direct-current power supply, and most of the current power-down protection circuits output a level to a micro-control chip when the voltage is lower than a certain reference value, and the micro-control chip enters a power-down mode; when the voltage is higher than the reference value, a level is output to the micro control chip, and the micro control chip enters a normal working mode. However, the existing direct current protection circuit cannot detect the voltage change of the positive power supply and the negative power supply at the same time, and the precision is not high.
Disclosure of Invention
The invention aims to overcome the defects or problems in the background art and provide a direct current power supply power-down detection circuit and a power-down detection module, which can monitor the voltage changes of a positive power supply and a negative power supply at the same time and have high detection precision.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the direct-current power supply power-down detection circuit is used for being connected with a detection end of a control chip; the control chip is suitable for outputting a first signal when the voltage of the detection end is higher than a set threshold value, and outputting a second signal when the voltage of the detection end is not higher than the set threshold value; the direct-current power supply power failure detection circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a first diode; the non-inverting input end of the operational amplifier is grounded, the inverting input end of the operational amplifier is connected with a direct current negative power supply through a first resistor, the inverting input end of the operational amplifier is also connected with the first end of a second resistor, and the output end of the operational amplifier is connected with the cathode of a first diode; the anode of the first diode is connected with the first end of the third resistor; the first end of the fourth resistor is connected with a direct current positive power supply; the first end of the fifth resistor is grounded; the second end of the second resistor, the second end of the third resistor, the second end of the fourth resistor and the second end of the fifth resistor are all connected to the detection end.
Based on the first technical scheme, a second technical scheme is further provided, and in the second technical scheme, a sixth resistor is further connected in series between the second end of the second resistor and the detection end.
Based on the first technical scheme, a third technical scheme is further provided, and in the third technical scheme, the model of the operational amplifier is OPA2171.
The fourth technical scheme is that the power-down detection module comprises a control chip and the direct-current power-down detection circuit in any one of the first to third technical schemes, wherein the control chip is provided with a first pin, a second pin and a third pin, the first pin is grounded, and the third pin forms the detection end; the control chip is suitable for outputting a first signal at the second pin when the voltage of the detection end is higher than a set threshold value, and is suitable for outputting a second signal at the second pin when the voltage of the detection end does not exceed the set threshold value.
Based on the fourth technical scheme, a fifth technical scheme is further provided, and in the fifth technical scheme, the model of the control chip is TLV809K33.
Based on the fourth technical scheme, a sixth technical scheme is further provided, in the sixth technical scheme, the first signal is a high-level signal, and the second signal is a low-level signal.
Based on the fourth technical scheme, a seventh technical scheme is further provided, in the seventh technical scheme, the control chip further comprises a seventh resistor, and the second pin of the control chip is connected to the first end of the seventh resistor.
Based on the seventh technical scheme, a eighth technical scheme is further provided, and the power supply device further comprises a second diode, an eighth resistor and a power supply positive power supply, wherein the negative electrode of the second diode is connected to the second end of the seventh resistor, and the positive electrode of the second diode is connected to the power supply positive power supply through the eighth resistor.
Based on the technical scheme eight, a technical scheme nine is further provided, in the technical scheme nine, the LED lamp further comprises a third diode, the negative electrode of the third diode is connected to the second end of the seventh resistor, and the positive electrode of the third diode is grounded.
Based on the technical scheme nine, a technical scheme ten is further provided, in the technical scheme ten, the device further comprises a first capacitor and a second capacitor, a first end of the first capacitor is connected to the detection end, and a second end of the first capacitor is grounded; the first end of the second capacitor is connected to the second end of the seventh resistor and the first end of the seventh resistor, and the second end of the second capacitor is grounded.
From the above description of the present invention, compared with the prior art, the present invention has the following advantages:
1. in the first technical scheme, the voltage change of the direct current positive power supply and the voltage change of the direct current negative power supply both affect the voltage change of the inverting input end of the operational amplifier, the direct current positive power supply voltage is assumed to be Vp, the direct current negative power supply voltage is assumed to be Vn, when the inverting input end of the operational amplifier inputs positive voltage, the output end of the operational amplifier outputs low level, the first diode is conducted, the inverting input end, the output end, the first diode, the third resistor and the second resistor of the operational amplifier form a closed loop, the voltage of the inverting input end is continuously adjusted until the voltage becomes 0V, the voltage of the detection end is (0-Vn)/R1R 2, therefore, the voltage of the detection end and the direct current negative power supply voltage form a linear relation, and when the direct current negative power supply voltage drops to a set threshold, the voltage of the detection end also drops to a set threshold, and the control chip can output a first signal or a second signal accordingly; therefore, the circuit can perform power-down detection on the direct-current negative power supply voltage; when the negative voltage is input to the inverting input terminal of the operational amplifier, the output terminal of the operational amplifier outputs a high level, the first diode is turned off, and at this time, the voltage at the detection terminal is ((Vp/r4+vn/(r1+r2)) +
The detection circuit of the scheme can output a determined numerical value according to the change of the direct current positive power supply voltage and the direct current negative power supply voltage, so that the control chip can output different signals according to the voltage numerical value of the detection end to realize high-precision detection when the direct current power supply is powered down, and in practical application, the resistances of the first resistor, the second resistor, the third resistor, the fourth resistor and the fifth resistor can be correspondingly set to ensure that the detection end reaches the same threshold value when the direct current positive power supply and the direct current negative power supply are powered down to the same range interval.
2. In the second technical scheme, the second end of the second resistor and the detection end are also connected in series with a sixth resistor, so that the voltage of the detection end can be conveniently adjusted.
3. In the third technical scheme, the model of the operational amplifier is OPA2171, the cost is low, and the control is accurate.
4. In the fourth technical scheme, the control chip outputs a first signal at the second pin when the input voltage of the detection end is greater than a set threshold value, and outputs a second signal at the second pin when the input voltage of the detection end is less than or equal to the set threshold value, so that the change of the direct current positive power supply voltage and the negative power supply voltage can be converted into control signals to be output, and the control is accurate; if the direct current negative power supply is turned into OV, the first diode is conducted, the terminal voltage VD of the first diode is 0.6-0.7V, and the voltage of the detection terminal is ((Vp/R4+Vn/(R1+R2) +VD/R3)/((1/(R1+R2) +1/R4+1/R5)), and the voltage of the second pin of the control chip can be ensured to be always larger than the supply voltage by setting the resistance value of the resistors R1-R6.
5. In the fifth technical scheme, the model of the control chip is TV809K33, the cost is low, and the control is accurate.
6. In the sixth technical scheme, the first signal is a high-level signal, and the second signal is a low-level signal, so that the implementation is easy.
7. In the seventh aspect, the seventh resistor may divide the voltage of the second pin of the control chip.
8. In the eighth technical scheme, when the second pin of the control chip outputs a high level due to the arrangement of the second diode, the eighth resistor and the power supply positive power supply, the second diode is cut off, so that the power supply positive power supply maintains an output potential through the eighth resistor.
9. In the ninth aspect, when the third pin of the control chip outputs a low level, the third diode can maintain the third pin at a relatively low potential.
10. In the tenth technical scheme, the first capacitor and the second capacitor can be arranged to realize a filtering effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments below are briefly introduced, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a power down detection module of the present invention;
the main reference numerals illustrate:
an operational amplifier ICIA; a first resistor R1; a second resistor R2; a third resistor R3; a fourth resistor R4; a fifth resistor R5; a sixth resistor R6; a seventh resistor R7; an eighth resistor R8; a first capacitor C1; a second capacitor C2; a control chip IC2; a first diode D1; a second diode D2; and a third diode D3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are preferred embodiments of the invention and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without creative efforts, are within the protection scope of the present invention.
In the claims, specification and drawings hereof, unless explicitly defined otherwise, the terms "first," "second," or "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
In the claims, specification and drawings of the present invention, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.
Referring to fig. 1, fig. 1 shows a power-down detection module, which includes a dc power-down detection circuit and a control chip IC2.
The direct-current power supply power-down detection circuit is used for being connected with a detection end (point A in fig. 1) of the control chip IC2; the control chip IC2 is suitable for outputting a first signal when the voltage of the detection end is higher than a set threshold value, and is suitable for outputting a second signal when the voltage of the detection end does not exceed the set threshold value, specifically, the control chip IC2 is provided with a first pin 1, a second pin 2 and a third pin 3, the first pin 1 is grounded, and the third pin 3 is connected to the detection end; the control chip IC2 is adapted to output a first signal at the second pin 2 when the voltage of the detection terminal is higher than the set threshold, and is adapted to output a second signal at the second pin 2 when the voltage of the detection terminal does not exceed the set threshold, in this embodiment, the model of the control chip IC2 is TLV809K33, the first signal is a high level signal, and the second signal is a low level signal, which is low in cost and accurate in control.
The direct-current power supply power failure detection circuit comprises an operational amplifier ICIA, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a first diode D1; the non-inverting input end of the operational amplifier ICIA is grounded, the inverting input end of the operational amplifier ICIA is connected with a direct current negative power supply (15 VD in figure 1) through a first resistor R1, the inverting input end of the operational amplifier ICIA is also connected with the first end of a second resistor R2, and the output end of the operational amplifier ICIA is connected with the cathode of a first diode D1; the anode of the first diode D1 is connected to the first end of the third resistor R3; the first end of the fourth resistor R4 is connected to a direct current positive power supply (+15VD in figure 1); the first end of the fifth resistor R5 is grounded; the second end of the second resistor R2, the second end of the third resistor R3, the second end of the fourth resistor R4 and the second end of the fifth resistor R5 are connected to the detection end (point a in fig. 1), a sixth resistor R6 is connected in series between the second end of the second resistor R2 and the detection end, and the resistance value of the sixth resistor R6 can be set correspondingly to adjust the voltage of the inverting input end of the operational amplifier. In this embodiment, R1 is 100deg.KΩ, R2 is 24KΩ, R3 is 1KΩ, R4 is 12KΩ, R5 is 4.7KΩ, and R6 is 0KΩ.
In specific implementation, the power failure detection module further comprises a seventh resistor R7, a second diode D2, an eighth resistor R8, a +5V power supply positive power supply, a third diode D3, a first capacitor C1 and a second capacitor C2, wherein a second pin 2 of the control chip IC2 is connected to a first end of the seventh resistor R7, a negative electrode of the second diode D2 is connected to a second end of the seventh resistor R7, and a positive electrode of the second diode D2 is connected to a power supply positive power supply +5VD through the eighth resistor R8; the cathode of the third diode D3 is connected to the second end of the seventh resistor R7, and the anode of the third diode D3 is grounded; the first end of the first capacitor C1 is connected to the detection end, and the second end is grounded; the first end of the second capacitor C2 is connected to the second end of the seventh resistor R7, and the second end is grounded.
The working principle of the power failure detection module is as follows:
both the voltage of the direct current positive power supply and the voltage of the direct current negative power supply influence the voltage variation of the inverting input end of the operational amplifier ICIA; for convenience of description, the direct current positive power supply voltage is vp=15v, the direct current negative power supply voltage is vn= -15V, the voltage of the detection end is Vin, and the voltage of the inverting input end of the operational amplifier ICIA is Vo;
when the positive voltage Vo is input to the inverting input end of the operational amplifier ICIA, the output end of the operational amplifier ICIA outputs a low level, the first diode D1 is turned on, the input end and the output end of the operational amplifier ICIA, the first diode D1, the third resistor R3 and the second resistor R2 form a closed loop, the voltage Vo at the inverting input end is continuously adjusted until the voltage Vo becomes 0V, and the voltage vin= (0-Vn)/R1 (r2+r6) = 3.6V at the detection end; therefore, the voltage Vin at the detection end and the direct current negative power supply voltage form a linear relation, and when the direct current negative power supply voltage drops to a set threshold value, the voltage Vin at the detection end also drops to a set threshold value, so that the circuit can detect the power failure of the direct current negative power supply voltage; in this embodiment, the threshold of the control chip IC2 is set to 2.93V, so when the dc negative power voltage Vn drops to-12.2V, the second pin 2 of the control chip IC2 outputs a low level signal, and at this time, the third diode D3 can maintain the second pin 2 at a relatively low potential; the seventh resistor R7 can divide the voltage output by the second pin; the arrangement of the first capacitor C1 and the second capacitor C2 can realize a filtering effect;
when the negative voltage Vo is input to the inverting input terminal of the operational amplifier ICIA, the output terminal of the operational amplifier ICIA outputs a high level, the first diode D1 is turned off, and at this time, the voltage Vin at the detection terminal is ((Vp/r4+vn/(r1+r2+r6))/(1/(r1+r2+r6) +1/r4+1/R5) =3.712V (r6=0);
at this time, the voltage vo= (Vin-Vn)/r1 (r2+r6) =0.09V at the inverting input terminal of the op-amp, if the calculated Vo potential is positive, the voltage vin= (0-Vn)/r1 (r2+r6) =3.6V at the maintaining detection terminal is calculated in the above manner; if the calculated Vo potential is negative, the voltage Vin at the detection terminal is still ((Vp/R4+Vn/(R1+R2+R6))/(1/(R1+R2+R6) +1/R4+1/R5).
Therefore, when the direct-current positive power supply voltage drops to a set threshold value, the voltage Vin of the detection end also drops to a set threshold value, so that the circuit can detect the power failure of the direct-current positive power supply voltage; when the negative potential is input to the inverting input terminal Vo of the operational amplifier ICIA, the voltage of the detection terminal will be changed due to the change of the direct current positive power supply voltage or the change of the negative power supply voltage, but the detected direct current positive power supply voltage is still the main change, for the set threshold of 2.93V, when vn= -15V, vp=12.15V can trigger the second pin 2 of the control chip IC2 to output a low level signal, and when vn= -14V, vp=12.05V can trigger the second pin 2 of the control chip IC2 to output a low level signal; when vn= -16V, vp=12.25v triggers the second pin 2 of the control chip IC2 to output a low level signal; it can be seen that, in this embodiment, the dc positive power supply and the dc negative power supply both trigger the second pin 2 of the control chip IC2 to output a low-level signal when the power is turned off to about 12V, that is, when the voltages of the dc positive power supply and the dc negative power supply drop to the same range interval, the detection ends reach the same threshold.
When Vn has great fluctuation, if the direct current negative power supply Vn becomes OV, the input voltage Vo at the inverting input end of the operational amplifier is also 0V, at this time, the first diode D1 is turned on, the end voltage VD of the first diode D1 is 0.6-0.7V, at this time, the voltage Vin at the detection end is ((Vp/r4+vn/(r1+r2) +vd/R3)/((1/(r1+r2+r6) +1/r4+1/R5) =1.326V (vd=0.6v, r6=0), so that the voltage of the third pin of the control chip IC2 is always greater than the supply voltage 1V of the control chip, and the normal operation of the control chip IC2 is ensured.
It should be understood that, when the input voltage Vo at the inverting input terminal of the operational amplifier is 0V, the voltage Vn at the detecting terminal has the two calculation modes, and in practical application, a relatively large value is calculated as the input voltage at the detecting terminal.
When the direct current power supply supplies power normally, the second pin 2 of the control chip IC2 outputs a high level signal, and when the second pin 2 of the control chip IC2 outputs a high level due to the arrangement of the second diode D2, the eighth resistor R8 and the power supply positive power supply +5VD, the second diode D2 is cut off, so that the power supply positive power supply +5VD maintains an output potential through the eighth resistor R8, and connection with an external circuit is facilitated.
Therefore, the detection circuit of the scheme can output a determined numerical value according to the change of the direct current positive power supply voltage and the negative power supply voltage no matter the direct current positive power supply voltage or the direct current negative power supply voltage is powered down, so that the detection circuit can be connected with the detection end of an external control chip in practical application, and the control chip can output different signals according to the voltage numerical value of the detection end, thereby realizing high-precision detection when the direct current power supply is powered down; in practical application, the resistance values of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 can be set correspondingly, so as to ensure that the detection end reaches the same set threshold value when the voltages of the direct current positive power supply and the negative power supply are reduced to the same range interval. The foregoing description of the embodiments and description is presented to illustrate the scope of the invention, but is not to be construed as limiting the scope of the invention. Modifications, equivalents, and other improvements to the embodiments of the invention or portions of the features disclosed herein, as may occur to persons skilled in the art upon use of the invention or the teachings of the embodiments, are intended to be included within the scope of the invention, as may be desired by persons skilled in the art from a logical analysis, reasoning, or limited testing, in combination with the common general knowledge and/or knowledge of the prior art.
Claims (10)
1. The direct current power supply power failure detection circuit is used for being connected with a detection end of the control chip; the control chip is suitable for outputting a first signal when the voltage of the detection end is higher than a set threshold value, and outputting a second signal when the voltage of the detection end is not higher than the set threshold value; the direct-current power supply power failure detection circuit is characterized by comprising an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a first diode;
the non-inverting input end of the operational amplifier is grounded, the inverting input end of the operational amplifier is connected with a direct current negative power supply through a first resistor, the inverting input end of the operational amplifier is also connected with the first end of a second resistor, and the output end of the operational amplifier is connected with the cathode of a first diode;
the anode of the first diode is connected with the first end of the third resistor;
the first end of the fourth resistor is connected with a direct current positive power supply;
the first end of the fifth resistor is grounded;
the second end of the second resistor, the second end of the third resistor, the second end of the fourth resistor and the second end of the fifth resistor are all connected to the detection end.
2. The dc power failure detection circuit of claim 1, wherein a sixth resistor is further connected in series between the second end of the second resistor and the detection end.
3. The dc power loss detection circuit of claim 1, wherein said operational amplifier is of the OPA2171 type.
4. A power failure detection module, which is characterized by comprising a control chip and the direct current power failure detection circuit according to any one of claims 1-3, wherein the control chip is provided with a first pin, a second pin and a third pin, the first pin is grounded, and the third pin forms the detection end; the control chip is suitable for outputting a first signal at the second pin when the voltage of the detection end is higher than a set threshold value, and is suitable for outputting a second signal at the second pin when the voltage of the detection end does not exceed the set threshold value.
5. The power down detection module of claim 4, wherein the control chip is of a type TLV809K33.
6. The power down detection module of claim 4, wherein the first signal is a high signal and the second signal is a low signal.
7. The power down detection module of claim 5, further comprising a seventh resistor, wherein the second pin of the control chip is coupled to the first end of the seventh resistor.
8. The power failure detection module of claim 7, further comprising a second diode, an eighth resistor, and a power supply positive power source, wherein a negative electrode of the second diode is connected to a second end of the seventh resistor, and a positive electrode of the second diode is connected to the power supply positive power source through the eighth resistor.
9. The power failure detection module of claim 8, further comprising a third diode, wherein a negative electrode of the third diode is connected to the second end of the seventh resistor, and a positive electrode of the third diode is grounded.
10. The power down detection module of claim 9, further comprising a first capacitor and a second capacitor, wherein a first end of the first capacitor is connected to the detection end, and a second end of the first capacitor is grounded; the first end of the second capacitor is connected to the second end of the seventh resistor and the first end of the seventh resistor, and the second end of the second capacitor is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310340098.4A CN116299029A (en) | 2023-03-31 | 2023-03-31 | Direct current power supply power-down detection circuit and power-down detection module |
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| CN202310340098.4A CN116299029A (en) | 2023-03-31 | 2023-03-31 | Direct current power supply power-down detection circuit and power-down detection module |
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