CN110596605A - Train and over-voltage and under-voltage detection device for train storage battery charging - Google Patents
Train and over-voltage and under-voltage detection device for train storage battery charging Download PDFInfo
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- CN110596605A CN110596605A CN201910927758.2A CN201910927758A CN110596605A CN 110596605 A CN110596605 A CN 110596605A CN 201910927758 A CN201910927758 A CN 201910927758A CN 110596605 A CN110596605 A CN 110596605A
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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Abstract
The invention discloses an over-voltage and under-voltage detection device for charging a train storage battery, which comprises: a storage battery; the charging device is connected with the storage battery and is used for charging the storage battery; a sampling circuit for detecting the voltage on the charging circuit; the signal processing device is connected with the sampling circuit and used for receiving the voltage detected by the sampling circuit, outputting an overvoltage signal when the voltage is higher than a first threshold value and outputting an undervoltage signal when the voltage is lower than a second threshold value; and the feedback circuit is respectively connected with the signal processing device and the charging device and is used for feeding the output of the signal processing device back to the charging device so that the charging device can interrupt the charging of the storage battery when receiving the overvoltage signal or the undervoltage signal. By the adoption of the scheme, the power supply of the storage battery can be cut off in time when the output of the charger is overvoltage and under-voltage, and the storage battery is protected. The application also provides a train with corresponding technical effects.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a train and an over-voltage and under-voltage detection device for charging a train storage battery.
Background
When a charger of a train charges a storage battery of a vehicle, the charging is usually supplemented or floating charged according to a specific storage battery charging temperature compensation curve, so that the requirement of emergency power supply of the storage battery is met, and the charging is stopped when abnormal temperature is detected.
The abnormal output voltage of the charger can cause the temperature of the storage battery to be overhigh, but the process has a certain time delay, the overhigh charging voltage can start to cause certain damage to the service life of the storage battery before the temperature is higher than the threshold value, and serious faults can be caused in some occasions.
In summary, how to timely and effectively cut off the power supply of the storage battery when the charger outputs the overvoltage is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a train and an over-voltage and under-voltage detection device for charging a train storage battery, so as to effectively cut off the power supply of the storage battery when a charger outputs over-voltage.
In order to solve the technical problems, the invention provides the following technical scheme:
an under-voltage detection device is crossed in train battery charging includes:
a storage battery;
the charging device is connected with the storage battery and is used for charging the storage battery;
a sampling circuit for detecting the voltage on the charging circuit;
the signal processing device is connected with the sampling circuit and used for receiving the voltage detected by the sampling circuit, outputting an overvoltage signal when the voltage is higher than a first threshold value and outputting an undervoltage signal when the voltage is lower than a second threshold value;
and the feedback circuit is respectively connected with the signal processing device and the charging device and is used for feeding the output of the signal processing device back to the charging device so as to interrupt the charging of the storage battery when the charging device receives the overvoltage signal or the undervoltage signal.
Preferably, the sampling circuit includes:
the first resistor is connected with the charging positive bus at a first end, and is respectively connected with the inverting input end of the first operational amplifier and the first end of the second resistor at a second end;
the second end of the second resistor is connected with the output end of the first operational amplifier; the connection end of the second resistor and the first operational amplifier is used as the output end of the sampling circuit;
the first end of the third resistor is connected with the charging negative bus, and the second end of the third resistor is connected with the non-inverting input end of the first operational amplifier and the first end of the fourth resistor respectively;
the fourth resistor with the second end grounded;
the power end is connected with a first power supply, and the grounding end is grounded.
Preferably, the sampling circuit further includes:
the first end of the fifth resistor is connected with the second end of the second resistor and the output end of the first operational amplifier respectively, and the second end of the fifth resistor is connected with the first end of the first capacitor;
the first capacitor with the second end grounded; and the connection end of the first capacitor and the fifth resistor is used as the output end of the sampling circuit.
Preferably, the sampling circuit further includes:
the anode of the first diode is connected with the non-inverting input end of the first operational amplifier and the cathode of the second diode respectively, and the cathode of the first diode is connected with the inverting input end of the first operational amplifier and the anode of the second diode respectively;
the second diode.
Preferably, the feedback circuit includes:
the first end of the sixth resistor is connected with a pin of the signal processing device for outputting an overvoltage signal, and the second end of the sixth resistor is connected with the first end of the first optical coupler;
the second end of the first optical coupler is grounded, the third end of the first optical coupler is respectively connected with the first end of the first voltage stabilizing diode and the first end of the seventh resistor, and the fourth end of the first optical coupler is respectively connected with the second end of the first voltage stabilizing diode and the charging device;
the first zener diode;
the seventh resistor with a second end connected with the charging positive bus;
the eighth resistor is connected with the first end of the second optical coupler and the second end of the eighth resistor;
the second end of the second optical coupler is grounded, the third end of the second optical coupler is respectively connected with the first end of the second voltage stabilizing diode and the first end of the ninth resistor, and the fourth end of the second optical coupler is respectively connected with the second end of the second voltage stabilizing diode and the charging device;
the second zener diode;
and the ninth resistor is connected with the charging positive bus at the second end.
Preferably, the signal processing device is further configured to output a voltage normal signal when the voltage is equal to or less than the first threshold and equal to or greater than the second threshold;
still include in the undervoltage detection device is crossed in the charging of train battery:
and the display device is connected with the signal processing device and used for displaying first information when the signal processing device outputs an overvoltage signal, displaying second information when the signal processing device outputs an undervoltage signal and displaying third information when the signal processing device outputs a voltage normal signal.
Preferably, the display device includes:
the first end of the tenth resistor is connected with a pin of the signal processing device for outputting an overvoltage signal, and the second end of the tenth resistor is connected with the input end of the first indicator lamp;
the output end of the first indicator light is grounded;
the first end of the eleventh resistor is connected with a pin of the signal processing device for outputting a normal voltage signal, and the second end of the eleventh resistor is connected with the input end of the second indicator light;
the second indicator light with the output end grounded;
the first end of the twelfth resistor is connected with a pin of the signal processing device for outputting the undervoltage signal, and the second end of the twelfth resistor is connected with the input end of the third indicator lamp;
the output end of the third indicator light is grounded.
Preferably, the charging device steps down the received voltage through a voltage conversion circuit to supply power to the signal processing device, the sampling circuit and a communication gateway in the train.
Preferably, the voltage conversion circuit is a two-stage voltage conversion circuit, wherein the first stage converts the 110V dc power received by the charging device into 24V dc power to supply power to the communication gateway, and the second stage converts the 24V dc power into 5V dc power to supply power to the signal processing device and the sampling circuit.
A train comprises the over-voltage and under-voltage detection device for charging the train storage battery.
By applying the technical scheme provided by the embodiment of the invention, the voltage on the charging circuit can be detected through the sampling circuit, and when the overvoltage condition occurs, namely the voltage detected by the sampling circuit received by the signal processing device is higher than the first threshold value, the signal processing device can enable the charging device to interrupt the charging of the storage battery through the feedback circuit. Carry out overvoltage detection through directly to the charging line, compare in avoiding the excessive pressure through the temperature, be favorable to reducing cut off when excessive pressure that charges consuming time, just also be favorable to in time protecting the battery. In addition, when the voltage that sampling circuit that signal processing apparatus received detected is less than the second threshold value, explain that the charging circuit is under-voltage, the charging when considering that the battery is under-voltage can influence storage charge ability and emergent load capacity, consequently, when under-voltage, signal processing apparatus of this application also can make charging apparatus interrupt to the charging of battery through feedback circuit. The scheme of this application has the function of overvoltage detection and undervoltage detection concurrently promptly to can be in time when the output of charger is excessive pressure and the power supply of undervoltage shutoff battery, the protection battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an over-voltage and under-voltage detection device for charging a train storage battery according to the present invention;
FIG. 2 is a schematic diagram of a sampling circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a sampling circuit according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a control chip of a signal processing apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a feedback circuit according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating a first stage of a voltage converting circuit according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating a second stage of a voltage converting circuit according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide an over-voltage and under-voltage detection device for charging a train storage battery, which can cut off the power supply of the storage battery in time when the output of a charger is over-voltage and under-voltage, so as to protect the storage battery.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an overvoltage/undervoltage detection device for charging a train storage battery according to the present invention.
This train battery charging's mistake undervoltage detection device includes:
and a battery 10.
And a charging device 20 connected to the battery 10 for charging the battery 10.
The battery 10 generally used in a train is 110V, but it is needless to say that other types of batteries 10 may be used in different cases without affecting the practice of the present invention. The charging device 20 may charge the battery 10, and the specific circuit configuration may be set and adjusted according to actual needs.
A sampling circuit 30 that detects the voltage on the charging line.
And a signal processing device 40 connected to the sampling circuit 30 for receiving the voltage detected by the sampling circuit 30, outputting an over-voltage signal when the voltage is higher than a first threshold value, and outputting a under-voltage signal when the voltage is lower than a second threshold value.
And a feedback circuit 50 connected to the signal processing device 40 and the charging device 20, respectively, for feeding back the output of the signal processing device 40 to the charging device 20, so that the charging device 20 interrupts the charging of the storage battery 10 when receiving the overvoltage signal or the undervoltage signal.
In some cases, the two input terminals of the sampling circuit 30 may be directly connected to the positive bus and the negative bus of the charging line, respectively, so as to obtain the bus voltage of the charging line. The specific circuit configuration of the sampling circuit 30 may be set as needed.
In an embodiment of the present invention, the sampling circuit 30 is constructed based on the operational amplifier, considering that the detection circuit constructed by the operational amplifier has high precision and is not easily affected by interference.
In particular, referring to fig. 2, in this embodiment, the sampling circuit 30 includes:
a first resistor R1 having a first end connected to the charging positive bus and a second end connected to the inverting input terminal of the first operational amplifier OP and the first end of the second resistor R2, respectively;
a second resistor R2 having a second end connected to the output end of the first OP; the connection end of the second resistor R2 and the first operational amplifier is used as the output end of the sampling circuit 30;
a third resistor R3 having a first end connected to the negative bus and a second end connected to the non-inverting input of the first operational amplifier OP and the first end of the fourth resistor R4, respectively;
a fourth resistor R4 with its second terminal grounded;
the power end is connected with the first power supply, and the grounding end is grounded.
In practical applications, the resistances of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 can be set and adjusted according to actual needs, and the same applies to the resistors in the following embodiments. In addition, according to actual needs, a plurality of resistors can be connected in series/parallel to achieve a required resistance value, so as to reduce the cost, for example, in the embodiment of fig. 3, three resistors are connected in series to serve as the equivalent first resistor R1, and correspondingly, three resistors are connected in series to serve as the equivalent second resistor R2.
The charging positive bus is denoted by D + in the figures of the present application and correspondingly the charging negative bus is denoted by D-. The power end of the first operational amplifier OP is connected to a first power supply, which is usually a dc5V power supply, however, in practical applications, when different types of first operational amplifiers OP are used, the first power supply may have other values, which does not affect the implementation of the present invention.
To further improve the sampling accuracy, in the embodiment of fig. 3, the sampling circuit 30 further includes:
a fifth resistor R5 having a first end connected to the second end of the second resistor R2 and the output end of the first operational amplifier, and a second end connected to the first end of the first capacitor C1;
a first capacitor C1 with a second terminal grounded; the connection between the first capacitor C1 and the fifth resistor R5 serves as the output of the sampling circuit 30.
The value of the first capacitor C1 can also be set and adjusted as required, and in this kind of implementation, by setting the first capacitor C1 at the output end, it is favorable to reduce the harmonic, i.e. further improve the precision through filtering.
In addition, in the embodiment of fig. 3, the sampling circuit 30 is further provided with two anti-phase parallel diodes to implement overvoltage protection, specifically, the anode of the first diode D1 is connected to the non-inverting input terminal of the first operational amplifier OP and the cathode of the second diode D2, respectively, and the cathode of the first diode D1 is connected to the anti-phase input terminal of the first operational amplifier OP and the anode of the second diode D2, respectively.
Of course, in other cases, a bidirectional diode may be directly used instead of the first diode D1 and the second diode D2, and the overvoltage protection can be realized.
The signal processing device 40 is connected to the output end of the sampling circuit 30, and when the voltage detected by the sampling circuit 30 is higher than a preset first threshold, which indicates that the charging line is overvoltage, the signal processing device 40 will output an overvoltage signal. Correspondingly, the signal processing device 40 of the present application may also determine whether the voltage is too low, and when the voltage detected by the sampling circuit 30 is lower than the preset second threshold, it indicates that the charging circuit is under-voltage, and then the signal processing device 40 may output an under-voltage signal.
The signal processing device 40 may be implemented by a single chip microcomputer, and in other situations, a controller with higher cost may be selected as the signal processing device 40. The specific values of the first threshold and the second threshold may be set and adjusted according to actual needs, and of course, the second threshold is lower than the first threshold. For example, in practical applications, the first threshold value is 135V, and the second threshold value is 90V.
Fig. 4 shows a schematic structure of a control chip of the signal processing apparatus 40 in a specific case. Pins 1 to 3 are used for data interaction with other systems, such as data downloading, pin 5 receives VCC power supply of DC5V, pin 6 is GND pin, and pins 7, 8, and 9 are respectively used for outputting an over-voltage signal, a normal voltage signal, and an under-voltage signal, which are respectively denoted as OV, OK, and LV. In this embodiment, the overvoltage signal, the normal voltage signal, and the undervoltage signal are all high level signals, that is, when the overvoltage signal is not output, pin 7 is in a low level state, when the normal voltage signal is not output, pin 8 is in a low level state, and when the undervoltage signal is not output, pin 9 is in a low level state. The pin 10 is a reset pin, the pin 11 is used for connecting with the sampling circuit 30, namely, the pins 15 and 17 receive the voltage sampling signal UB output by the sampling circuit 30, and the pin 16 is an AGND pin and the pin DC 5V.
And a feedback circuit 50 connected to the signal processing device 40 and the charging device 20, respectively, for feeding back the output of the signal processing device 40 to the charging device 20, so that the charging device 20 interrupts the charging of the storage battery 10 when receiving the overvoltage signal or the undervoltage signal.
Generally, the voltage level of the output signal of the signal processing device 40 is low, and the voltage level of the electrical signal recognizable by the charging device 20 is high, so that the signal transmission needs to be realized by the feedback circuit 50. Further, an isolation circuit may be generally used to transmit signals to avoid damage to the signal processing device 40 due to an excessive voltage in an abnormal situation, and the isolation circuit is an optical coupler-based isolation circuit.
A schematic diagram of a feedback circuit 50 in one embodiment is shown for example in figure 5,
in the embodiment of fig. 5, the feedback circuit 50 includes:
a sixth resistor R6 having a first end connected to the pin of the signal processing device 40 for outputting the overvoltage signal and a second end connected to the first end of the first optocoupler G1;
a first optocoupler G1 having a second terminal grounded, a third terminal connected to the first terminal of the first zener diode G1 and the first terminal of the seventh resistor R7, respectively, and a fourth terminal connected to the second terminal of the first zener diode D11 and the charging device 20, respectively;
a first zener diode D11;
a seventh resistor R7 with a second end connected with the charging positive bus;
an eighth resistor R8 having a first end connected to a pin of the signal processing device 40 for outputting the under-voltage signal and a second end connected to the first end of the second photo-coupler G2;
a second optocoupler G2 having a second terminal grounded, a third terminal connected to the first terminal of the second zener diode G2 and the first terminal of the ninth resistor R9, respectively, and a fourth terminal connected to the second terminal of the second zener diode D22 and the charging device 20, respectively;
a second zener diode D22;
and a ninth resistor R9 having a second terminal connected to the charging positive bus.
In the embodiment of fig. 5, when the signal processing device 40 outputs an overvoltage signal, i.e., outputs an OV signal, the light emitter in the first optocoupler G1 may emit light, and the third terminal and the fourth terminal of the first optocoupler G1 may be turned on, so that the pin of the charging device 20 for connecting with the first optocoupler G1 receives a high level signal, i.e., the charging device 20 receives the overvoltage signal, and of course, if the voltage of the charging bus is restored to a normal range or an undervoltage occurs, the pin is restored to a low level.
Accordingly, when the signal processing device 40 outputs the brown-out signal LV, the charging device 20 may receive the brown-out signal through the second optocoupler G2.
By applying the technical scheme provided by the embodiment of the invention, the voltage on the charging line can be detected through the sampling circuit 30, and when an overvoltage condition occurs, namely the voltage detected by the sampling circuit 30 and received by the signal processing device 40 is higher than the first threshold value, the signal processing device 40 can enable the charging device 20 to interrupt the charging of the storage battery 10 through the feedback circuit 50. Through directly carrying out the excessive pressure to the charging line and detecting, compare in avoiding the excessive pressure through the temperature, be favorable to reducing cut off when excessive pressure that charges consuming time, just also be favorable to in time protecting battery 10. In addition, when the voltage detected by the sampling circuit 30 received by the signal processing device 40 is lower than the second threshold, it is described that the charging circuit is under-voltage, and it is considered that the charge when the battery 10 is under-voltage affects the charge storage capacity and the emergency load capacity, therefore, the signal processing device 40 of the present application also causes the charging device 20 to interrupt the charge of the battery 10 through the feedback circuit 50 when the voltage is under-voltage. That is, the present invention has both functions of overvoltage detection and undervoltage detection, and can cut off the power supply to the battery 10 at the output overvoltage and undervoltage of the charger in time to protect the battery 10.
In one embodiment of the present invention, the signal processing device 40 is further configured to output a voltage normal signal when the voltage is equal to or less than a first threshold and equal to or greater than a second threshold;
still include in the undervoltage detection device is crossed in the charging of train battery:
and the display device is connected with the signal processing device 40 and is used for displaying first information when the signal processing device 40 outputs an overvoltage signal, displaying second information when the signal processing device 40 outputs an undervoltage signal and displaying third information when the signal processing device 40 outputs a normal voltage signal.
In this kind of embodiment, consider if in real time show the mistake undervoltage state of charging circuit, alright in order to realize the visual controllable of undervoltage, be favorable to the staff can audio-visually see out whether the charging circuit has the under-voltage condition, and then be favorable to in time carrying out fault handling, also be difficult for producing fault handling's misjudgement.
The specific form of the display device can be set according to needs, and can be a display screen, an indicator light and the like. It should be noted that in this embodiment, the display device can not only display the over-voltage and under-voltage, but also display a third message to indicate that the voltage is normal when the voltage is normal.
In one embodiment, referring to fig. 6, a display device includes:
a tenth resistor R10, the first end of which is connected with a pin of the signal processing device 40 for outputting an overvoltage signal, and the second end of which is connected with the input end of the first indicator light Z1;
a first indicator light Z1 with the output end grounded;
an eleventh resistor R11, the first end of which is connected with a pin of the signal processing device 40 for outputting a normal voltage signal, and the second end of which is connected with the input end of the second indicator light Z2;
a second indicator light Z2 with the output end grounded;
a twelfth resistor R12, the first end of which is connected with a pin of the signal processing device 40 for outputting the undervoltage signal, and the second end of which is connected with the input end of the third indicator light Z3;
and the output end of the third indicator light Z3 is grounded.
The cost of adopting the pilot lamp is lower, and the circuit constitutes simply not easily to damage. The display color of each indicator light and the resistance value of each protection resistor can be set according to the needs, for example, the first indicator light Z1 showing overvoltage is the most important, and can be a red light for striking, the third indicator light Z3 showing undervoltage can be a yellow light, and the second indicator light Z2 showing normal voltage can be a green light.
In an embodiment of the present invention, the charging device 20 steps down the received voltage through a voltage conversion circuit to supply power to the signal processing device 40, the sampling circuit 30 and a communication gateway in the train.
In this embodiment, the over-voltage and under-voltage detection device for charging the train storage battery further has a low-power voltage conversion function, that is, the voltage received by the charging device 20 is reduced by the voltage conversion circuit, for example, 110V is reduced, so that power can be supplied to the signal processing device 40 and the sampling circuit 30. In addition, the power can be supplied to the communication gateway in the train.
Furthermore, considering that different devices require different voltages, the voltage conversion circuit can be a multistage voltage conversion circuit, and power supply of each component is realized by stepping down the voltage step by step. For example, in one embodiment, the voltage conversion circuit is a two-stage voltage conversion circuit, as shown in fig. 7 and 8, wherein the first stage converts 110V dc power received by the charging device 20 into 24V dc power to power the communication gateway, and the second stage converts 24V dc power into 5V dc power to power the signal processing device 40 and the sampling circuit 30. Of course, in other cases, for example, when there are components requiring voltage levels of 48V, 12V, or the like, the voltage conversion circuit may be adjusted to a circuit of more stages.
Corresponding to the above embodiment of the over-voltage and under-voltage detection device for charging the train storage battery, the embodiment of the invention also provides a train, which can comprise the over-voltage and under-voltage detection device for charging the train storage battery in any embodiment, and the description is not repeated here.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The principle and the implementation of the present invention are explained in the present application by using specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a train battery charging's mistake undervoltage detection device which characterized in that includes:
a storage battery;
the charging device is connected with the storage battery and is used for charging the storage battery;
a sampling circuit for detecting the voltage on the charging circuit;
the signal processing device is connected with the sampling circuit and used for receiving the voltage detected by the sampling circuit, outputting an overvoltage signal when the voltage is higher than a first threshold value and outputting an undervoltage signal when the voltage is lower than a second threshold value;
and the feedback circuit is respectively connected with the signal processing device and the charging device and is used for feeding the output of the signal processing device back to the charging device so as to interrupt the charging of the storage battery when the charging device receives the overvoltage signal or the undervoltage signal.
2. The apparatus of claim 1, wherein the sampling circuit comprises:
the first resistor is connected with the charging positive bus at a first end, and is respectively connected with the inverting input end of the first operational amplifier and the first end of the second resistor at a second end;
the second end of the second resistor is connected with the output end of the first operational amplifier; the connection end of the second resistor and the first operational amplifier is used as the output end of the sampling circuit;
the first end of the third resistor is connected with the charging negative bus, and the second end of the third resistor is connected with the non-inverting input end of the first operational amplifier and the first end of the fourth resistor respectively;
the fourth resistor with the second end grounded;
the power end is connected with a first power supply, and the grounding end is grounded.
3. The apparatus of claim 2, wherein the sampling circuit further comprises:
the first end of the fifth resistor is connected with the second end of the second resistor and the output end of the first operational amplifier respectively, and the second end of the fifth resistor is connected with the first end of the first capacitor;
the first capacitor with the second end grounded; and the connection end of the first capacitor and the fifth resistor is used as the output end of the sampling circuit.
4. The apparatus of claim 2, wherein the sampling circuit further comprises:
the anode of the first diode is connected with the non-inverting input end of the first operational amplifier and the cathode of the second diode respectively, and the cathode of the first diode is connected with the inverting input end of the first operational amplifier and the anode of the second diode respectively;
the second diode.
5. The apparatus of claim 1, wherein the feedback circuit comprises:
the first end of the sixth resistor is connected with a pin of the signal processing device for outputting an overvoltage signal, and the second end of the sixth resistor is connected with the first end of the first optical coupler;
the second end of the first optical coupler is grounded, the third end of the first optical coupler is respectively connected with the first end of the first voltage stabilizing diode and the first end of the seventh resistor, and the fourth end of the first optical coupler is respectively connected with the second end of the first voltage stabilizing diode and the charging device;
the first zener diode;
the seventh resistor with a second end connected with the charging positive bus;
the eighth resistor is connected with the first end of the second optical coupler and the second end of the eighth resistor;
the second end of the second optical coupler is grounded, the third end of the second optical coupler is respectively connected with the first end of the second voltage stabilizing diode and the first end of the ninth resistor, and the fourth end of the second optical coupler is respectively connected with the second end of the second voltage stabilizing diode and the charging device;
the second zener diode;
and the ninth resistor is connected with the charging positive bus at the second end.
6. The over-voltage and under-voltage detection device for the train storage battery charging according to any one of claims 1 to 5, wherein the signal processing device is further configured to output a voltage normal signal when the voltage is less than or equal to the first threshold and greater than or equal to the second threshold;
still include in the undervoltage detection device is crossed in the charging of train battery:
and the display device is connected with the signal processing device and used for displaying first information when the signal processing device outputs an overvoltage signal, displaying second information when the signal processing device outputs an undervoltage signal and displaying third information when the signal processing device outputs a voltage normal signal.
7. The apparatus for detecting the over-voltage and under-voltage during the charging of the train storage battery according to claim 6, wherein the display device comprises:
the first end of the tenth resistor is connected with a pin of the signal processing device for outputting an overvoltage signal, and the second end of the tenth resistor is connected with the input end of the first indicator lamp;
the output end of the first indicator light is grounded;
the first end of the eleventh resistor is connected with a pin of the signal processing device for outputting a normal voltage signal, and the second end of the eleventh resistor is connected with the input end of the second indicator light;
the second indicator light with the output end grounded;
the first end of the twelfth resistor is connected with a pin of the signal processing device for outputting the undervoltage signal, and the second end of the twelfth resistor is connected with the input end of the third indicator lamp;
the output end of the third indicator light is grounded.
8. The apparatus according to claim 1, wherein the charging apparatus reduces the voltage received by the voltage converting circuit to supply power to the signal processing apparatus, the sampling circuit and the communication gateway in the train.
9. The apparatus according to claim 8, wherein the voltage converting circuit is a two-stage voltage converting circuit, a first stage converts the 110V dc power received by the charging device into 24V dc power to power the communication gateway, and a second stage converts the 24V dc power into 5V dc power to power the signal processing device and the sampling circuit.
10. A train comprising an under-voltage and over-voltage detection device for charging a train battery as claimed in any one of claims 1 to 9.
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| CN201910927758.2A CN110596605A (en) | 2019-09-27 | 2019-09-27 | Train and over-voltage and under-voltage detection device for train storage battery charging |
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| CN201910927758.2A CN110596605A (en) | 2019-09-27 | 2019-09-27 | Train and over-voltage and under-voltage detection device for train storage battery charging |
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| CN113131577A (en) * | 2021-04-19 | 2021-07-16 | 北京鼎汉技术集团股份有限公司 | Train charging control method and train charging control device |
| CN113359022A (en) * | 2021-07-01 | 2021-09-07 | 深圳群芯微电子有限责任公司 | Measuring method, circuit and device for screening optical MOS relay |
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