CN217902334U - Voltage range monitoring circuit based on voltage reference device - Google Patents
Voltage range monitoring circuit based on voltage reference device Download PDFInfo
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- CN217902334U CN217902334U CN202221959118.3U CN202221959118U CN217902334U CN 217902334 U CN217902334 U CN 217902334U CN 202221959118 U CN202221959118 U CN 202221959118U CN 217902334 U CN217902334 U CN 217902334U
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Abstract
The utility model discloses a voltage monitoring field's a voltage range monitoring circuit based on voltage reference device, including switch circuit, one-level voltage reference circuit and second grade voltage reference circuit, the reference feedback volume as one-level voltage reference circuit is surveyed to the sample value of power, one-level voltage reference circuit's output value and the reference feedback volume as second grade voltage reference circuit is surveyed to the sample value of power, second grade reference circuit's output connection to switch circuit's controlled end, switch circuit output is surveyed the control value of power. The utility model discloses a calculation configuration to resistance parameter has realized the settlement to lower limit threshold value and upper limit threshold value, adopts one-level voltage reference circuit, second grade voltage reference circuit to realize judgement and the control to voltage upper limit and voltage lower limit, and when being surveyed power supply voltage and being higher than the upper limit threshold value and being less than the lower limit threshold value, circuit design's output logic is unanimous, and the output of circuit when being different from normal voltage scope has played and has felt the good voltage monitoring effect.
Description
Technical Field
The utility model relates to a voltage monitoring field specifically is a voltage range monitoring circuit based on voltage reference device.
Background
Voltage range monitoring has wide application in electrical control systems. Too low a voltage may render the system inoperable and too high a voltage may cause irreversible damage to the system. In order to enable the system to work and operate in the optimal and reasonable voltage range, at present, AD acquisition is carried out, the AD acquisition is sent into a single chip microcomputer to carry out voltage sampling, comparison is carried out according to a safety threshold value preset by voltage in a program, and the single chip microcomputer controls an IO output state signal to act, display or set.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a voltage range monitoring circuit based on voltage reference device adopts hardware circuit to realize, has that peripheral circuit is simple, circuit safe and reliable's advantage, can respond safely in time and protect the action, and the guarantee system can safe and reliable work.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a voltage range monitoring circuit based on a voltage reference device comprises a switch circuit, a primary voltage reference circuit and a secondary voltage reference circuit, wherein a sampling value of a power source to be detected is used as a reference feedback quantity of the primary voltage reference circuit, an output value of the primary voltage reference circuit and the sampling value of the power source to be detected are used as a reference feedback quantity of the secondary voltage reference circuit, the output of the secondary voltage reference circuit is connected to a controlled end of the switch circuit, and the switch circuit outputs a monitoring value of the power source to be detected.
Furthermore, the primary voltage reference circuit comprises a first voltage division circuit and a first reference source, the first voltage division circuit is connected between the power source to be detected and the ground, and the output end of the first voltage division circuit is connected with the reference end of the first reference source.
Furthermore, the secondary voltage reference circuit comprises a second voltage division circuit and a second reference source, the second voltage division circuit is connected between the power source to be detected and the ground, and the output ends of the first reference source and the first voltage division circuit are connected with the reference end of the second reference source.
Further, the first reference source and/or the second reference source is configured as a reference voltage source with model number TL 431.
Further, the switching circuit includes a transistor.
Has the advantages that: the utility model discloses a calculation configuration to resistance parameter has realized the settlement to lower limit threshold value and upper limit threshold value, and the one-level voltage reference circuit, the second grade voltage reference circuit that adopt the looks isostructure have realized judgement and the control to voltage upper limit and voltage lower limit, and when being surveyed power supply voltage and being higher than the upper limit threshold value and being less than the lower limit threshold value, circuit design's output logic is unanimous, and the output of circuit when being different from normal voltage range has consequently played and has hated good voltage monitoring effect.
Drawings
Fig. 1 is a circuit block diagram of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a voltage range monitoring circuit based on a voltage reference device includes a switch circuit, a primary voltage reference circuit and a secondary voltage reference circuit, a sampling value of a measured power source is used as a reference feedback quantity of the primary voltage reference circuit, an output value of the primary voltage reference circuit and the sampling value of the measured power source are used as reference feedback quantities of the secondary voltage reference circuit, an output of the secondary voltage reference circuit is connected to a controlled end of the switch circuit, and the switch circuit outputs a monitoring value of the measured power source.
The primary voltage reference circuit gives a lower threshold, the secondary voltage reference circuit gives an upper threshold, the primary voltage reference circuit and the secondary voltage reference circuit have the same structure, and the upper and lower thresholds can be set through parameter configuration. And when the sampling value of the tested power supply is between the lower limit threshold value and the upper limit threshold value, the switching circuit outputs a normal monitoring value. On the contrary, if the voltage of the tested power supply is smaller than the lower limit threshold, the sampling value of the tested power supply influences the output of the primary voltage reference circuit, and further influences the output of the secondary voltage reference circuit, so that the output of the switching circuit is abnormal; similarly, if the voltage of the power supply to be tested is greater than the upper threshold, the output of the secondary voltage reference circuit is directly influenced, so that the output of the switch circuit is abnormal.
Specifically, the embodiment shown in fig. 2 is used for explanation:
PWR _15V, VCC, MCU _3.3V are three sets of power supplies in common ground, and VCC, MCU _3.3V can be DC/DC converted from PWR _ 15V. PWR _15V is the power supply to be tested.
The primary voltage reference circuit comprises a first voltage division circuit and a first reference source, wherein the first voltage division circuit comprises resistors R1 and R3, and the first reference source is configured as a reference voltage source V1 with the model number of TL 431. The resistors R1 and R3 are connected in series, the common end connected with the resistors R1 and R3 is connected with the reference end of the reference voltage source V1, the other end of the resistor R1 is connected with the PWR _15V, and the other end of the resistor R3 is connected with GND. A capacitor C1 is connected to PWR _15V with GND, and a capacitor C2 is connected in parallel to both ends of the resistor R3.
The two-stage voltage reference circuit comprises a second voltage division circuit and a second reference source, wherein the second voltage division circuit comprises resistors R2 and R4, and the second reference source is configured to a reference voltage source V2 with the model number of TL 431. One end of the resistor R2 is connected with PWR _15V, the other end is connected with the cathode of the reference voltage source V1, and the anode of the reference voltage source V1 is connected with GND. The resistor R4 is connected between the cathode and the anode of the reference voltage source V1 and between the reference end and the anode of the reference voltage source V2 in parallel, and the resistor R4 is also connected with the capacitor C3 in parallel; the anode of the reference voltage source V2 is connected with GND, the cathode is connected with VCC through a resistor R5, and a capacitor C4 is connected between VCC and GND.
The switching circuit includes a transistor Q1, in this embodiment, the transistor Q1 is configured as an NPN transistor, and in other embodiments, the transistor Q1 may also be a PNP transistor, or a MOS device, without limitation.
The base electrode of the triode Q1 is connected with the cathode of a reference voltage source V2, the collector electrode of the triode Q1 is connected with MCU _3.3V through a resistor R7, and a capacitor C6 is connected between MCU 3.3V and GND. The collector of the triode Q1 is also used as an output end to output a detection result of the voltage range of PWR _15V, wherein PWR _ Monitor _15V is output. The emitting electrode of the triode Q1 is connected with GND, and a resistor R6 and a capacitor C5 are respectively connected in parallel between the base electrode and the emitting electrode. The capacitors C1, C2, C4, C6 and C7 are power supply end decoupling connecting capacitors.
The output end of the reference voltage source V1 is taken as a point A, the output end of the reference voltage source V2 is taken as a point B, and the output end of the switching tube Q1 is taken as a point C. The reference input voltage = PWR _15V × R3/(R1 + R3) of the reference voltage source V1, and the reference input voltage = PWR _15V × R4/(R2 + R4) of the reference voltage source V2, where the reference input voltage is used for comparison with the 2.5V reference of the reference voltage source itself, and if the reference input voltage is greater than 2.5V, the reference voltage source is turned on. By setting the parameters of the resistors R1, R3 and the resistors R2, R4, the lower threshold V can be set min 15V and an upper threshold value V MAX 15V。
If the PWR _15V nominal voltage is 15V, by setting the parameters of the resistors R1 and R3, at this time, PWR _15V × R3/(R1 + R3) < 2.5v, PWR _15v × R4/(R2 + R4) > 2.5V, the reference voltage source V1 is open, point a is high, the reference voltage source V2 is on, point B is low, the collector of the switching tube Q1 is open-circuited, point C is high, and PWR _15V is in the normal range.
When PWR _15V is more than or equal to V MAX When the voltage is 15V, the voltage division sampling value of the first voltage division circuit to PWR _15V is larger than 2.5V, the reference voltage source V1 is conducted, the point A is pulled down to be low level, the reference voltage source V2 is caused to be open, the point B is high level, the switching tube Q1 is conducted, the point C is low level, and PWR _15V is abnormal.
When PWR _15V is less than or equal to V min When the voltage is 15V, the reference voltage source V1 is opened, the partial pressure sampling value of the second voltage division circuit to PWR _15V is less than 2.5V, the reference voltage source V2 is opened, and the point B is highWhen the level is high, the switching tube Q1 is turned on, the point C is low, and PWR _15V is abnormal.
The utility model discloses but wide application in the safety threshold value control of control power and power supply, circuit output signal can regard as the signal use of action, warning, sign, and when the circuit realized basic function, still had following effect:
1. based on the reference device, the peripheral circuit is few, the temperature drift is low, and the adaptive range of the circuit temperature is wide;
2. the reference voltage is convenient to adjust, the circuit parameter configuration is flexible, and the circuit is suitable for wide application voltage classes;
3. the reference voltage has high precision, and the simple circuit can realize accurate control.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (5)
1. The voltage range monitoring circuit based on the voltage reference device is characterized by comprising a switch circuit, a primary voltage reference circuit and a secondary voltage reference circuit, wherein a sampling value of a tested power supply is used as a reference feedback quantity of the primary voltage reference circuit, an output value of the primary voltage reference circuit and the sampling value of the tested power supply are used as reference feedback quantities of the secondary voltage reference circuit, the output of the secondary voltage reference circuit is connected to a controlled end of the switch circuit, and the switch circuit outputs a monitoring value of the tested power supply.
2. The voltage range monitoring circuit of claim 1, wherein the primary voltage reference circuit comprises a first voltage divider circuit and a first reference source, the first voltage divider circuit is connected between the power supply to be tested and ground, and the output terminal of the first voltage divider circuit is connected to the reference terminal of the first reference source.
3. The voltage range monitoring circuit of claim 2, wherein the secondary voltage reference circuit comprises a second voltage divider circuit and a second reference source, the second voltage divider circuit is connected between the power supply to be tested and ground, and the output terminals of the first voltage divider circuit and the first reference source are connected to the reference terminal of the second reference source.
4. The voltage range monitoring circuit of claim 3, wherein the first reference source and/or the second reference source is configured as a reference voltage source model TL 431.
5. The voltage reference device based voltage range monitoring circuit of claim 1, wherein said switching circuit comprises a transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221959118.3U CN217902334U (en) | 2022-07-26 | 2022-07-26 | Voltage range monitoring circuit based on voltage reference device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221959118.3U CN217902334U (en) | 2022-07-26 | 2022-07-26 | Voltage range monitoring circuit based on voltage reference device |
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| Publication Number | Publication Date |
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| CN217902334U true CN217902334U (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221959118.3U Active CN217902334U (en) | 2022-07-26 | 2022-07-26 | Voltage range monitoring circuit based on voltage reference device |
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| CN (1) | CN217902334U (en) |
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- 2022-07-26 CN CN202221959118.3U patent/CN217902334U/en active Active
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