CN109342973B - Direct current power supply input state monitoring circuit and system - Google Patents
Direct current power supply input state monitoring circuit and system Download PDFInfo
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- CN109342973B CN109342973B CN201811373060.2A CN201811373060A CN109342973B CN 109342973 B CN109342973 B CN 109342973B CN 201811373060 A CN201811373060 A CN 201811373060A CN 109342973 B CN109342973 B CN 109342973B
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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
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
Abstract
The invention provides a direct current power supply input state monitoring circuit and a system, wherein the circuit comprises a voltage division module, a detection module, a switch module and an optical coupling isolation module which are connected in sequence; the voltage division module is used for dividing the input voltage of the direct-current power supply and outputting the divided voltage to the detection module; the detection module is used for comparing the divided voltage with the reference voltage and outputting a comparison result to the switch module; the switch module is used for switching on or off according to the comparison result; the optical coupling isolation module is used for outputting a level signal when the switch module is switched on or switched off so as to indicate whether the input of the direct-current power supply is in an undervoltage state or not, so that the input voltage state of the direct-current power supply is monitored, and the monitoring cost is reduced.
Description
Technical Field
The invention relates to the technical field of direct-current power supply input state monitoring, in particular to a direct-current power supply input state monitoring circuit and system.
Background
Under normal conditions, the input voltage of a direct current power supply must be within a certain range, and the power supply can normally work, and if the input voltage of the power supply is too low, the power supply cannot normally work; and if the input power supply is energy storage devices such as a storage battery or a super capacitor, the service life of the energy storage devices can be damaged if the voltage is too low. At this time, the state of the power input voltage needs to be monitored to judge whether the power input voltage is in a normal range, and if the power input voltage is monitored to be too low, the alarm and protection of an undervoltage state need to be carried out.
In the prior art, monitoring of the input under-voltage state of the dc power supply is generally implemented by using a control chip, and in the monitoring process of the input under-voltage state of the dc power supply, a corresponding program is generally programmed in the control chip, and the control chip is set in a corresponding monitoring circuit, so as to implement monitoring of the input under-voltage state of the dc power supply.
However, in the prior art, the input under-voltage state monitoring of the direct-current power supply is realized through the control chip, and the cost is high.
Disclosure of Invention
The invention provides a direct current power supply input state monitoring circuit and a direct current power supply input state monitoring system, which are used for monitoring a direct current input state and reducing monitoring cost.
In a first aspect, the present invention provides a dc power input status monitoring circuit, including:
the device comprises a voltage division module, a detection module, a switch module and an optical coupling isolation module which are connected in sequence.
The voltage division module is used for dividing the input voltage of the direct-current power supply and outputting the divided voltage to the detection module; the detection module is used for comparing the divided voltage with the reference voltage and outputting a comparison result to the switch module; the switch module is used for switching on or off according to the comparison result; the optical coupling isolation module is used for outputting a level signal when the switch module is switched on or switched off so as to indicate whether the input of the direct current power supply is in an undervoltage state or not.
In this scheme, carry out the partial pressure through the partial pressure module to DC power supply input voltage, then make detection module compare partial pressure voltage and reference voltage to according to the result control switch module switch on or break off, opto-coupler isolation module has realized the monitoring to DC power supply input voltage state according to the different level signal of switch module's state output.
Optionally, the voltage dividing module includes a first resistor, a second resistor, and a first capacitor;
one end of the first resistor is connected with the positive electrode of the direct-current power supply, 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 negative electrode of the direct-current power supply, and the first capacitor is connected with the second resistor in parallel.
In the scheme, one end of the first resistor is connected with the positive electrode of the direct-current power supply, 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 negative electrode of the direct-current power supply, the voltage division of the input voltage of the direct-current power supply is realized, the first capacitor is connected with the second resistor in parallel, and the voltage stabilization of the voltage division of the second resistor is realized.
Optionally, the circuit provided in the embodiment of the present invention further includes:
if the divided voltage is greater than the reference voltage, the comparison result is used for triggering the switch module to be conducted; and if the divided voltage is less than or equal to the reference voltage, the comparison result is used for triggering the switch module to be switched off.
According to the scheme, the on or off of the switch module is triggered through the comparison result of the divided voltage and the reference voltage, the voltage range of the divided voltage is judged through the on or off of the switch module, and then the state monitoring of the direct-current power supply input is realized.
Optionally, the switch module includes: the device comprises an NPN triode, an NMOS tube, a third resistor, a first voltage regulator tube and a second voltage regulator tube;
one end of a third resistor is connected with the positive electrode of the direct-current power supply, the other end of the third resistor is connected with a first voltage-stabilizing tube, the first voltage-stabilizing tube is connected with a second voltage-stabilizing tube, and the second voltage-stabilizing tube is connected with the negative electrode of the direct-current power supply; the base electrode of the NPN triode is connected between the first voltage regulator tube and the second voltage regulator tube, the emitting electrode of the NPN triode is connected with the detection module, and the collecting electrode of the NPN triode is connected with the source electrode of the NMOS tube; the grid electrode of the NMOS tube is connected between the third resistor and the first voltage stabilizing tube, and the drain electrode of the NMOS tube is connected with the optical coupling isolation module.
In the scheme, one end of a third resistor is connected with the positive electrode of the direct-current power supply, the other end of the third resistor is connected with a first voltage-stabilizing tube, the first voltage-stabilizing tube is connected with a second voltage-stabilizing tube, the voltage values in the first voltage-stabilizing tube and the second voltage-stabilizing tube are guaranteed to be stable, and then the switch module is switched on or switched off according to the comparison result of the divided voltage and the reference voltage through the connection among the NPN triode, the NMOS tube, the first voltage-stabilizing tube and the second voltage-stabilizing tube.
Optionally, the circuit provided in the embodiment of the present invention further includes: a fourth resistor;
one end of the fourth resistor is connected with an emitting electrode of the NPN triode, and the other end of the fourth resistor is connected with the detection module.
In the scheme, one end of the fourth resistor is connected with the emitting electrode of the NPN triode, and the other end of the fourth resistor is connected with the cathode of the detection module, so that the control of the current in the circuit is realized.
Optionally, the optical coupling isolation module includes an optical coupling isolator and a fifth resistor;
the primary side input end of the optical coupling isolator is connected with the anode of the direct current power supply, and the primary side output end of the optical coupling isolator is connected with the switch module; and the negative side output end of the optical coupling isolator is connected with a fifth resistor.
Optionally, the optocoupler isolator is specifically configured to:
when the switch module is conducted, outputting a high level signal;
and when the switch module is switched off, outputting a low level signal.
In this scheme, through opto-isolator output high level signal when switch module switches on, output low level signal when switch module disconnection, to the monitoring of on-off state, and then realized the monitoring to direct current power input state.
Optionally, the circuit provided in the embodiment of the present invention further includes: a protection module;
one end of the protection module is connected with the switch module, and the other end of the protection module is connected with the optical coupling isolation module; the protection module is used for reducing current oscillation in a primary side diode of the optical coupler isolator.
In the scheme, the current limiting protection of the optocoupler isolator is realized through the protection module, the current oscillation in a primary side diode of the optocoupler isolator is reduced, and the sensitivity and the accuracy of the optocoupler isolator for outputting a level signal according to the state of the switch module are improved.
Optionally, the protection module includes: a sixth resistor and a second capacitor;
and the sixth resistor is connected with the second capacitor in parallel, one end of the sixth resistor is connected with the switch module, and the other end of the sixth resistor is connected with the positive electrode of the direct-current power supply.
In a second aspect, the present invention provides a dc power input status monitoring system, including:
a dc power supply, a controller and a dc power supply input status monitoring circuit as described in the first aspect and optional aspects of the first aspect.
The controller is used for controlling whether the direct current power supply continues to supply power according to an output signal of the direct current power supply input state monitoring circuit.
The direct-current power supply input state monitoring circuit and the system provided by the invention have the advantages that the voltage division module, the detection module, the switch module and the optical coupling isolation module are sequentially connected; the voltage division module is used for dividing the input voltage of the direct-current power supply and outputting the divided voltage to the detection module; the detection module is used for comparing the divided voltage with the reference voltage and outputting a comparison result to the switch module; the switch module is used for switching on or off according to the comparison result; the optical coupling isolation module is used for outputting a level signal when the switch module is switched on or switched off so as to indicate whether the input of the direct current power supply is in an undervoltage state or not. The direct current power supply input voltage is divided through the voltage dividing module, then the detection module compares the divided voltage with the reference voltage, the switch module is controlled to be switched on or switched off according to the comparison result, the optical coupling isolation module outputs different level signals according to the state of the switch module, the monitoring of the state of the direct current power supply input voltage is achieved, and the monitoring cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a dc power input status monitoring circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dc power input state monitoring circuit according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dc power input state monitoring circuit according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a dc power input state monitoring circuit according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a dc power input state monitoring circuit according to a fifth embodiment of the present invention;
fig. 6 is a schematic diagram of a dc power input status monitoring system according to an embodiment of the present invention.
Description of reference numerals:
11: voltage division module
12: detection module
13: switch module
14: optical coupling isolation module
22: TL431 chip
C1: first capacitor
C2: second capacitor
D1: first voltage regulator tube
D2: second voltage regulator tube
Q1: NPN triode
Q2: NMOS tube
R1: a first resistor
R2: second resistance
R3: third resistance
R4: fourth resistor
R5: fifth resistor
R6: sixth resistor
U3: optical coupling isolator
VIN +: positive electrode VIN of DC power supply
VIN-: negative electrode VIN of DC power supply
VCC: power supply
GND: ground connection
Vout: voltage output
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. 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.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Under normal conditions, the input voltage of the direct-current power supply must be within a certain range, and the direct-current power supply can normally work, and if the input voltage of the direct-current power supply is too low, the direct-current power supply cannot normally work; and if the direct current power supply is energy storage devices such as a storage battery or a super capacitor, the service life of the energy storage devices can be damaged if the voltage is too low. At this time, the input voltage state of the dc power supply needs to be monitored to determine whether the input voltage of the power supply is in a normal range, and in order to implement monitoring of the input voltage state of the dc power supply and save monitoring cost, embodiments of the present invention provide a circuit and a system for monitoring the input voltage state of the dc power supply.
The technical scheme of the application is described in detail as follows:
in most power supply systems, when the load current suddenly and rapidly increases (for example, an inrush current in a gas turbine engine), the output voltage of the power supply may decrease, and even slight changes in resistance and inductance may cause the voltage to decrease. If the input voltage of the dc power supply is too low, not only the dc power supply cannot work normally, but also the service life of the dc power supply is affected, and for such a situation, the input voltage state of the dc power supply needs to be monitored to judge whether the input voltage of the dc power supply is in a normal range, and if the input voltage of the dc power supply is too low, an alarm and protection in an undervoltage state are required. Based on the application scenario, the embodiment of the invention provides a direct-current power supply input state monitoring circuit and system.
Example one
Fig. 1 is a schematic diagram of a dc power input state monitoring circuit according to an embodiment of the present invention, and as shown in fig. 1, the circuit in this embodiment may include:
the voltage division module 11, the detection module 12, the light opening module 13 and the optical coupling isolation module 14 are connected in sequence; the voltage division module 11 is configured to divide an input voltage of the dc power supply and output the divided voltage to the detection module 12; the detection module 12 is configured to compare the divided voltage with a reference voltage, and output a comparison result to the light-turning-on module 13; the light-switching module 13 is used for switching on or off according to the comparison result; the optical coupling isolation module is used for outputting a level signal when the light-emitting module 13 is switched on or switched off so as to indicate whether the input of the direct-current power supply is in an undervoltage state.
The direct-current power supply can be an energy storage device such as a storage battery or a super capacitor, and the specific type, model and the like of the direct-current power supply are not limited in the embodiment of the invention as long as direct-current voltage can be input to the circuit.
The voltage dividing module 11 is used for dividing the input voltage of the dc power supply, outputting the divided voltage to the detection module 12, dividing the input voltage of the dc power supply through the voltage dividing module 11, and detecting the voltage value of the input voltage of the dc power supply by detecting the voltage value output by the divided voltage according to the proportional relation between the divided voltage and the input voltage of the dc power supply. For example, if the input voltage of the dc power supply is 100 volts and the division ratio of the divided voltage is 10%, the divided voltage is 10 volts, and the voltage value of the input voltage of the dc power supply can be calculated when the division ratio of the divided voltage and the voltage value of the divided voltage are known.
The embodiment of the present invention does not limit the specific structure of the voltage dividing module 11, as long as the input voltage of the dc power supply can be accurately reflected by the divided voltage of the voltage dividing module 11. Optionally, the voltage dividing module may be configured to connect different resistors in series between the input and the output of the dc power supply, so as to divide the input voltage of the dc power supply.
The voltage dividing module 11 outputs the divided voltage to the detection module 12, and the detection module 12 is configured to compare the divided voltage with a reference voltage.
In order to realize the judgment of the state of the direct current voltage input voltage by comparing the reference voltage with the divided voltage, the dividing proportion of the divided voltage can be reasonably set according to the magnitude of the reference voltage and the direct current input voltage. For example, if the input voltage of the dc power supply is lower than or equal to 100 v, the input voltage of the dc power supply is in an under-voltage state, and the reference voltage in the detection module 12 is 2.5 v, the divided voltage needs to be compared with 2.5 v, at this time, the divided voltage proportion of the divided voltage can be set to 2.5%, when the input voltage of the dc power supply is 100 v, the divided voltage is 2.5 v, at this time, the input voltage of the dc power supply is just in the under-voltage state, if the divided voltage is greater than the reference voltage through the comparison, the divided voltage is greater than 2.5 v, the input voltage of the dc power supply is greater than 100 v, at this time, the input voltage of the dc power supply is in a normal state, but not in the under-voltage state, if the divided voltage is less than the reference voltage through the comparison, the divided voltage is less than 2.5 v, at this time, the input voltage of the dc power supply is in the under-voltage state.
The embodiment of the present invention does not limit the specific circuit of the detection module 12, as long as the comparison between the divided voltage and the reference voltage can be realized. In one possible embodiment, the detection module 12 may be a TL431 chip 22.
The on or off of the light-switching-on module 13 is triggered by the comparison result of the divided voltage and the reference voltage, so that the voltage range of the divided voltage is judged by the on or off of the light-switching-on module 13, and further the state monitoring of the input of the direct-current power supply is realized.
The embodiment of the present invention does not limit the specific structure of the light splitting module 13, as long as the light splitting module can be turned on or off according to the comparison result of the detection module 12 on the divided voltage and the reference voltage.
After the light-emitting module 13 is turned on or turned off according to the comparison result, the optical coupling isolation module outputs a level signal when the light-emitting module 13 is turned on or turned off, so as to indicate whether the input of the direct-current power supply is in an undervoltage state. For example, if the divided voltage is greater than the reference voltage, the light-on module 13 is turned on, and the optical coupling isolation module outputs a high level to indicate that the input of the dc power supply is in a normal state; if the divided voltage is less than or equal to the reference voltage, the light-emitting module 13 is turned off, and the optical coupling isolation module outputs a low level to indicate that the direct current input is in an undervoltage state.
The direct-current power supply input state monitoring circuit provided by the invention comprises a voltage division module, a detection module, a switch module and an optical coupling isolation module which are sequentially connected; the voltage division module is used for dividing the input voltage of the direct-current power supply and outputting the divided voltage to the detection module; the detection module is used for comparing the divided voltage with the reference voltage and outputting a comparison result to the switch module; the switch module is used for switching on or off according to the comparison result; the optical coupling isolation module is used for outputting a level signal when the switch module is switched on or switched off so as to indicate whether the input of the direct current power supply is in an undervoltage state or not. The direct current power supply input voltage is divided through the voltage dividing module, then the detection module compares the divided voltage with the reference voltage, the switch module is controlled to be switched on or switched off according to the comparison result, the optical coupling isolation module outputs different level signals according to the state of the switch module, the monitoring of the state of the direct current power supply input voltage is achieved, and the cost is reduced.
Example two
On the basis of the first embodiment, a voltage division module and a detection module of the dc power input state monitoring circuit provided by the embodiment of the present invention are further introduced. Fig. 2 is a schematic structural diagram of a dc power input state monitoring circuit according to a second embodiment of the present invention, and as shown in fig. 2, the voltage dividing module 11 includes a first resistor R1, a second resistor R2, and a first capacitor C1; one end of the first resistor R1 is connected with the positive electrode VIN + of the direct-current power supply, the other end of the first resistor R1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the negative electrode VIN-of the direct-current power supply, and the first capacitor C1 is connected with the second resistor R2 in parallel.
One end of the first resistor R1 is connected with the positive electrode VIN + of the dc power supply, the other end of the first resistor R1 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is connected with the negative electrode VIN-of the dc power supply, so that voltage division of the input voltage of the dc power supply is realized, wherein the sum of the voltage across the first resistor R1 and the voltage across the second resistor R2 is the input voltage of the dc power supply, and the ratio of the voltage across the first resistor R1 to the voltage across the second resistor R2 is equal to the ratio of the resistance of the first resistor R1 to the resistance of the second resistor R2, for example, the ratio of the resistance of the first resistor R1 to the resistance of the second resistor R2 is 2 to 1, and the ratio of the voltage across the first resistor R1 to the voltage across the second resistor R2 is also 2 to 1. By adjusting the resistance values of the first resistor R1 and the second resistor R2, the power supply input voltage can be divided in any proportion. The embodiment of the invention does not limit the resistance values of the first resistor R1 and the second resistor R2, as long as the direct current input voltage can be divided according to actual conditions. Since the first resistor R1 and the second resistor R2 both divide the dc input voltage, the voltage across the first resistor R1 may be selected as the divided voltage, and the voltage across the second resistor R2 may also be selected as the divided voltage. Optionally, the voltage across the second resistor R2 is used as the divided voltage. The first capacitor C1 is connected in parallel across the second resistor R2, and the first capacitor C1 is used for filtering, so as to keep the voltage across the second resistor R2 stable.
Taking the voltage across the second resistor R2 as an example of the divided voltage, the voltage dividing module 11 outputs the divided voltage to the detection module 12, and the detection module 12 is configured to compare the divided voltage with the reference voltage.
In one possible embodiment, the detection module 12 may be a TL431 chip 22.
As shown in fig. 2, a reference terminal R of the TL431 chip 22 is connected between the first resistor R1 and the second resistor R2, an anode a of the TL431 chip 22 is connected to a cathode of the dc power supply, a cathode K of the TL431 chip 22 is connected to the light-emitting module, an input voltage of the reference terminal R is compared with a reference voltage of the TL431 chip 22 by the TL431 chip 22, and the input voltage of the reference terminal R is a divided voltage.
If the divided voltage is greater than the reference voltage of the TL431 reference terminal by 2.5 v, the cathode K voltage of the TL431 chip 22 is 2 v, and if the divided voltage is less than or equal to the reference voltage of the TL431 reference terminal by 2.5 v, the cathode K voltage of the TL431 chip 22 is high impedance. The detection module 12 compares the divided voltage with the reference voltage, and outputs the comparison result to the switch module, and the light-turning-on module 13 is turned on or off according to the comparison result, optionally, if the divided voltage is greater than the reference voltage, the comparison result is used for triggering the light-turning-on module 13 to be turned on; if the divided voltage is less than or equal to the reference voltage, the comparison result is used to trigger the light-turning-on module 13 to turn off. Specifically, if the divided voltage is greater than the reference voltage, the cathode K voltage of the TL431 chip 22 is 2 v, and the trigger switch module 13 is turned on, and if the divided voltage is less than or equal to the reference voltage, the cathode K voltage of the TL431 chip 22 is high impedance, and the trigger switch module 13 is turned off.
In the embodiment of the invention, the TL431 chip is used as the detection module, so that the monitoring cost of the input state of the direct-current power supply is reduced, the on or off of the light-on module is triggered through the comparison result of the divided voltage and the reference voltage, the voltage range of the divided voltage is judged through the on or off of the light-on module 13, and the input state monitoring of the direct-current power supply is further realized.
EXAMPLE III
On the basis of the first embodiment or the second embodiment, fig. 3 is a schematic structural diagram of a dc power input state monitoring circuit provided in the third embodiment of the present invention, and as shown in fig. 3, the switch module 23 in the dc power input state monitoring circuit provided in the embodiment of the present invention may further include: the circuit comprises an NPN triode Q2, an NMOS tube Q1, a third resistor R3, a first voltage regulator tube D1 and a second voltage regulator tube D2.
One end of a third resistor R3 is connected with a positive electrode VIN + of the direct-current power supply, the other end of the third resistor R3 is connected with a first voltage-stabilizing tube D1, a first voltage-stabilizing tube D1 is connected with a second voltage-stabilizing tube D2, and a second voltage-stabilizing tube D2 is connected with a negative electrode VIN-of the direct-current power supply; a base electrode B of the NPN triode Q2 is connected between the first voltage regulator tube D1 and the second voltage regulator tube D2, an emitting electrode E of the NPN triode Q2 is connected with the detection module 22, and a collector electrode C of the NPN triode Q2 is connected with a source electrode S of the NMOS tube Q1; the grid G of the NMOS tube Q1 is connected between the third resistor R3 and the first voltage regulator tube D1, and the drain D of the NMOS tube Q1 is connected with the optical coupling isolation module.
One end of a third resistor R3 is connected with a positive electrode VIN + of a direct-current power supply, the other end of the third resistor R3 is connected with a first voltage-regulator tube D1, and a first voltage-regulator tube D1 is connected with a second voltage-regulator tube D2, so that the voltage values of the first voltage-regulator tube D1 and the second voltage-regulator tube D2 are guaranteed to be stable voltage values. In one possible embodiment, the regulated voltage of the first regulator D1 is 6.8 volts and the regulated voltage of the second regulator D2 is 6.8 volts.
The switching tube module is turned on or off according to a comparison result of the detection module, for example, the TL431 chip compares the divided voltage with the reference voltage, and the divided voltage is greater than the reference voltage, then the cathode K voltage of the TL431 chip is 2 volts, the voltage at the base B of the NPN transistor Q2 is 6.8 volts, the NPN transistor Q2 is turned on, the gate G voltage of the NMOS transistor Q1 is (6.8+6.8) volts, the source S voltage of the NMOS transistor Q1 is 6.8 volts, the gate voltage of the NMOS transistor Q1 is greater than the source voltage, the NMOS transistor Q1 is turned on, the switching module 23 is in a conducting state, if the divided voltage is less than or equal to the reference voltage, the cathode K voltage of the TL431 chip is in a high impedance state, the NPN transistor Q2 is not turned on, the NMOS transistor Q1 is also not turned on, and the switching module 23 is in a disconnecting state.
In order to ensure that the optical coupler isolation module is in a working state, the current passing through the optical coupler isolation module 14 needs to be adjusted, optionally, as shown in fig. 3, the circuit provided in the embodiment of the present invention further includes: and a fourth resistor R4.
One end of the fourth resistor R4 is connected to the emitter of the NPN transistor Q2, and the other end of the fourth resistor R4 is connected to the detection module.
When the switch module 23 is in a conducting state, the current passing through the base B of the NPN triode Q2 is small and negligible, the internal resistance of the NMOS transistor Q1 is small and negligible, and the current value passing through the opto-isolator module is equal to the ratio of the difference between the voltage of the base B of the NPN triode Q2 and the voltage of the TL431 cathode K to the fourth resistor R4. Therefore, the current flowing through the optical coupling isolation module can be adjusted by adjusting the resistance value of the fourth resistor R4, and the optical coupling isolation module is ensured to be in a normal working state.
In the embodiment of the invention, one end of a third resistor R3 is connected with a positive electrode VIN + of a direct-current power supply, the other end of the third resistor R3 is connected with a first voltage-stabilizing tube D1, and a first voltage-stabilizing tube D1 is connected with a second voltage-stabilizing tube D2, so that the voltage values of the first voltage-stabilizing tube D1 and the second voltage-stabilizing tube D2 are guaranteed to be stable, and then the switch-on or switch-off of a switch module is realized according to the comparison result of the divided voltage and the reference voltage through the connection among an NPN triode Q2, an NMOS tube Q1, the first voltage-stabilizing tube D1 and the second voltage-stabilizing tube D2.
Example four
On the basis of the first embodiment, the second embodiment, or the third embodiment, in order to output different level signals according to the on-state or off-state of the switch module, and further indicate whether the dc power input is in an under-voltage state, optionally, fig. 4 is a schematic structural diagram of a dc power input state monitoring circuit provided in the fourth embodiment of the present invention; as shown in fig. 4, the optical coupler isolator module 14 includes an optical coupler isolator U3 and a fifth resistor R5.
A primary side input end 1 of the optocoupler isolator U3 is connected with an anode VIN + of a direct-current power supply, and a primary side output end 2 of the optocoupler isolator U3 is connected with the switch module; and the negative side output end of the optocoupler isolator U3 is connected with a fifth resistor R5.
The optocoupler isolator U3 is configured to package the light emitting diode and the phototransistor together. The optical coupling isolation module ensures that the two isolated parts of circuits are not electrically and directly connected, and mainly prevents interference caused by the electrical connection. The embodiment of the invention does not limit the type and model of the optocoupler isolator U3, as long as different level signals can be output according to whether current exists in the circuit.
The primary side of the optical coupler isolator U3 is connected with the positive electrode VIN + of the direct-Current power supply and the switch module, the negative side input end of the optical coupler isolator U3 is connected with a power supply (Volt Current concentrator, VCC), the negative side output end of the optical coupler isolator U3 is connected with the fifth resistor R5 and is grounded GND, and the negative side output end Vout of the optical coupler isolator U3 is also used for outputting a level signal. Optionally, when the switch module is turned on, the optical coupler isolator U3 outputs a high level signal; when the switch module is turned off, the optical coupler isolator U3 outputs a low level signal. In the embodiment of the invention, the optical coupling isolator outputs a high level signal when the switch module is switched on and outputs a low level signal when the switch module is switched off, so that the switch state is monitored, and further the monitoring of the input state of the direct current power supply is realized.
EXAMPLE five
Optionally, on the basis of any of the foregoing embodiments, fig. 5 is a schematic structural diagram of a dc power input state monitoring circuit provided in fifth embodiment of the present invention; as shown in fig. 5, between the optical coupling isolation module 14 and the switch module 23, there may be further included: a protection module 41.
One end of the protection module 41 is connected with the switch module, and the other end is connected with the optical coupling isolation module; the protection module 41 is used to reduce current oscillation in the primary diode of the optocoupler isolator.
When the switch module is switched from the on state to the off state, a very weak dark current may exist, and if the protection circuit is not incorporated, the dark current may flow through a diode of the opto-coupler isolator, which may cause the opto-coupler isolator to output a high level when the switch module is in the off state, so that whether the input of the direct current power supply is in the undervoltage state or not is judged incorrectly. The protection module includes: a sixth resistor R6 and a second capacitor C2. The sixth resistor R6 is connected in parallel with the second capacitor C2, one end of the sixth resistor R6 is connected to the switch module, and the other end of the sixth resistor R6 is connected to the positive electrode VIN + of the dc power supply.
In the embodiment of the invention, the current limiting protection of the optocoupler isolator is realized through the protection module, the current oscillation in a primary side diode of the optocoupler isolator is reduced, and the sensitivity and the accuracy of the optocoupler isolator for outputting a level signal according to the state of the switch module are improved.
EXAMPLE six
The present invention provides a dc power input state monitoring system, fig. 6 is a schematic diagram of the dc power input state monitoring system provided in the embodiment of the present invention, as shown in fig. 6, the system in the embodiment includes:
a dc power supply 61, a controller 63, and a dc power supply input state monitoring circuit 62 in any of the above embodiments.
The direct current power supply 61 is connected with the input end of the direct current power supply input state monitoring circuit 62, the controller 63 is connected with the output end of the direct current power supply input state monitoring circuit 62, and the controller 63 is used for controlling whether the direct current power supply 61 continues to supply power according to the output signal of the direct current power supply input state monitoring circuit 62.
The direct current power supply input state monitoring circuit 62 can be connected with the controller 63 through the output end of the optical coupling isolation module, and the controller 63 judges whether the input of the direct current power supply 61 is in an undervoltage state according to the output signal of the optical coupling isolation module, and if the input of the direct current power supply is judged to be in the undervoltage state, the direct current power supply 61 can be controlled not to continue to supply power, so that the direct current power supply 61 is protected.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A DC power input state monitoring circuit, comprising: the voltage division module, the detection module, the switch module and the optical coupling isolation module are connected in sequence;
the voltage division module is used for dividing the input voltage of the direct-current power supply and outputting the divided voltage to the detection module;
the detection module is used for comparing the divided voltage with a reference voltage and outputting a comparison result to the switch module;
the switch module is used for switching on or off according to the comparison result;
the optical coupling isolation module is used for outputting a level signal when the switch module is switched on or switched off so as to indicate whether the direct-current power supply input is in an undervoltage state or not;
the optical coupling isolation module comprises an optical coupling isolator and a fifth resistor;
the dc power input state monitoring circuit further includes: a protection module;
one end of the protection module is connected with the switch module, and the other end of the protection module is connected with the optical coupling isolation module;
the protection module is used for reducing current oscillation in a primary side diode of the optocoupler isolator;
the protection module includes: a sixth resistor and a second capacitor;
the sixth resistor is connected with the second capacitor in parallel, one end of the sixth resistor is connected with the switch module, and the other end of the sixth resistor is connected with the anode of the direct-current power supply;
wherein the switch module comprises: the device comprises an NPN triode, an NMOS tube, a third resistor, a first voltage regulator tube and a second voltage regulator tube;
one end of the third resistor is connected with the positive electrode of the direct-current power supply, the other end of the third resistor is connected with the first voltage-stabilizing tube, the first voltage-stabilizing tube is connected with the second voltage-stabilizing tube, and the second voltage-stabilizing tube is connected with the negative electrode of the direct-current power supply;
the base electrode of the NPN triode is connected between the first voltage regulator tube and the second voltage regulator tube, the emitting electrode of the NPN triode is connected with the detection module, and the collecting electrode of the NPN triode is connected with the source electrode of the NMOS tube;
the grid electrode of the NMOS tube is connected between the third resistor and the first voltage stabilizing tube, and the drain electrode of the NMOS tube is connected with the optical coupling isolation module.
2. The circuit of claim 1, wherein the voltage divider module comprises a first resistor, a second resistor, and a first capacitor;
one end of the first resistor is connected with the positive electrode of the direct-current power supply, 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 negative electrode VIN-of the direct-current power supply, and the first capacitor is connected with the second resistor in parallel.
3. The circuit of claim 1 or 2,
if the divided voltage is greater than the reference voltage, the comparison result is used for triggering the switch module to be conducted;
and if the divided voltage is less than or equal to the reference voltage, the comparison result is used for triggering the switch module to be switched off.
4. The circuit of claim 1, further comprising: a fourth resistor;
one end of the fourth resistor is connected with an emitting electrode of the NPN triode, and the other end of the fourth resistor is connected with the detection module.
5. The circuit of claim 1 or 2,
the primary side input end of the optical coupling isolator is connected with the anode of the direct current power supply, and the primary side output end of the optical coupling isolator is connected with the switch module; and the negative side output end of the optical coupling isolator is connected with the fifth resistor.
6. The circuit of claim 5, wherein the optocoupler isolator is specifically configured to:
when the switch module is conducted, outputting a high level signal;
and when the switch module is switched off, outputting a low level signal.
7. A dc power input condition monitoring system, comprising: a dc power supply, a controller, and a dc power supply input status monitoring circuit as claimed in any one of claims 1-6;
the controller is used for controlling whether the direct current power supply continues to supply power according to an output signal of the direct current power supply input state monitoring circuit.
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| CN111014084A (en) * | 2019-12-09 | 2020-04-17 | 深圳市众能达自动化设备有限公司 | Detection circuit and detection method for internal flashover of capacitor or battery |
| CN114003118A (en) * | 2020-07-28 | 2022-02-01 | 华为技术有限公司 | Server power supply circuit and server |
| CN112285575A (en) * | 2020-10-15 | 2021-01-29 | 中车大连电力牵引研发中心有限公司 | Direct-current voltage under-voltage detection circuit of storage battery |
| CN112698192A (en) * | 2020-12-01 | 2021-04-23 | 汉威科技集团股份有限公司 | On-line switch monitoring circuit and method |
| CN112782457A (en) * | 2020-12-28 | 2021-05-11 | 上海思源弘瑞自动化有限公司 | Alternating voltage monitoring circuit and equipment |
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