CN113834965A - Ripple voltage measuring device and method - Google Patents
Ripple voltage measuring device and method Download PDFInfo
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Abstract
本发明公开了一种纹波电压测量装置和方法。该装置包括控制单元、纹波采样单元、直流电压采样单元和显示单元；纹波采样单元用于采样直流母线的纹波电压，直流电压采样单元用于采样直流母线的直流电压；控制单元用于根据纹波电压和直流电压确定纹波电压系数；显示单元用于显示纹波电压、直流电压和纹波电压系数。本发明实施例控制单元可以根据纹波电压和直流电压直接计算纹波系数，从而可以通过纹波系数直接反映直流系统中充电机的状态，有利于简化定时试验测试的过程。纹波采样单元的采样频率很高，可以保证数据采集速度，纹波电压测量装置由定时试验测试改变为实时监测，更好的保障直流电源的输出质量，避免由于纹波电压过大可能带来的危害。
The invention discloses a ripple voltage measuring device and method. The device comprises a control unit, a ripple sampling unit, a DC voltage sampling unit and a display unit; the ripple sampling unit is used for sampling the ripple voltage of the DC bus, and the DC voltage sampling unit is used for sampling the DC voltage of the DC bus; the control unit is used for sampling the DC voltage of the DC bus; Determine the ripple voltage coefficient according to the ripple voltage and the DC voltage; the display unit is used to display the ripple voltage, the DC voltage and the ripple voltage coefficient. The control unit in the embodiment of the present invention can directly calculate the ripple coefficient according to the ripple voltage and the DC voltage, so that the state of the charger in the DC system can be directly reflected by the ripple coefficient, which is beneficial to simplify the timing test process. The sampling frequency of the ripple sampling unit is very high, which can ensure the data acquisition speed. The ripple voltage measurement device is changed from timing test test to real-time monitoring, which better guarantees the output quality of the DC power supply and avoids the possibility of excessive ripple voltage. hazard.
Description
Technical Field
The embodiment of the invention relates to the direct current system technology, in particular to a ripple voltage measuring device and method.
Background
The direct current system power supply is provided by the inversion output of a charger, the input of the charger is 380V alternating current power supply, direct current power supplies with different voltage levels are output, and the output power supply cannot avoid the interference of mixed ripples. The too large ripple of the station direct current power supply system can cause the generation of surge voltage and current, which can cause the malfunction or burnout of the relay of the secondary equipment of the power system, the ripple can also interfere the logic relation of the digital circuit and the normal work of the A/D conversion board, and the power management regulations clearly require that the output ripple of the power supply equipment does not exceed 0.5%. At present, the operation supervision of station-side equipment does not have real-time online monitoring, the regular inspection of a charger is mainly relied on every year, the timing test is complex, the overhaul and maintenance period is too long, and the ripple of a power supply system is difficult to ensure to operate in a normal range.
Disclosure of Invention
The invention provides a ripple voltage measuring device and method, so that the process of timing test of a charger can be simplified.
In a first aspect, an embodiment of the present invention provides a ripple voltage measurement apparatus, including a control unit, a ripple sampling unit, a dc voltage sampling unit, and a display unit;
the ripple sampling unit and the direct-current voltage sampling unit are connected with the direct-current bus, the ripple sampling unit is used for sampling the ripple voltage of the direct-current bus, and the direct-current voltage sampling unit is used for sampling the direct-current voltage of the direct-current bus; the control unit is connected with the ripple adopting unit and the direct-current voltage sampling unit and is used for determining a ripple voltage coefficient according to the ripple voltage and the direct-current voltage; the display unit is connected with the control unit and is used for displaying ripple voltage, direct current voltage and ripple voltage coefficients.
Optionally, the ripple voltage coefficient includes a ripple voltage effective value coefficient and a ripple voltage peak-to-peak value coefficient; the control unit comprises a ripple voltage effective value coefficient calculation module and a ripple voltage peak-to-peak value coefficient calculation module;
the ripple voltage effective value coefficient calculating module is used for calculating a ripple voltage effective value coefficient according to the absolute value of the ripple voltage and the average value of the direct current voltage;
the ripple voltage peak-to-peak coefficient calculation module is used for calculating a ripple voltage peak-to-peak coefficient according to the peak-to-valley voltage difference of the ripple voltage and the absolute value of the direct-current voltage average value.
Optionally, the calculation formula of the ripple voltage effective value coefficient is as follows:
in the formula, XUmmFor effective value coefficient of ripple voltage, URCIs the voltage quantity of the superimposed AC component in constant DC voltage, UDCIs the average value of the dc voltage.
The calculation formula of the ripple voltage peak-to-peak value coefficient is as follows:
in the formula, XUppIs the ripple voltage peak-to-peak coefficient, UppIs the peak-to-valley difference, U, of the ripple voltage sampleDCIs the average value of the dc voltage.
Optionally, the control unit further comprises a comparison output module; the comparison output module is used for judging the ripple voltage condition of the direct current bus according to the ripple voltage coefficient and the preset ripple voltage coefficient and outputting a state signal of the direct current bus.
Optionally, the ripple voltage measurement device further comprises an alarm unit;
the alarm unit is connected with the comparison output module and is used for outputting an alarm signal and an alarm node signal when the state signal of the direct current bus is an abnormal signal.
Optionally, the ripple voltage measurement device further comprises an ac voltage sampling unit;
the alternating voltage sampling unit is connected with the direct current bus and used for sampling alternating voltage of low-voltage alternating current directly flowing into a direct current system.
Optionally, the ripple voltage measurement device further comprises a communication unit; the communication unit is connected with the control unit and is used for realizing the communication of the control unit.
Optionally, the ripple voltage measurement device further comprises a power supply unit; the power supply unit is connected with the control unit, the ripple sampling unit, the direct-current voltage sampling unit and the display unit and is used for providing power for the control unit, the ripple sampling unit, the direct-current voltage sampling unit and the display unit.
In a second aspect, an embodiment of the present invention provides a ripple voltage measurement method, including:
acquiring direct-current voltage and ripple voltage of a direct-current bus;
determining a ripple voltage coefficient according to the direct current voltage and the ripple voltage;
and displaying the ripple voltage, the direct current voltage and the ripple voltage coefficient.
Optionally, determining the ripple voltage coefficient according to the dc voltage and the ripple voltage includes:
calculating a ripple voltage effective value coefficient according to the absolute value of the ripple voltage and the average value of the direct current voltage;
and calculating the peak-to-peak coefficient of the ripple voltage according to the peak-to-valley voltage difference of the ripple voltage and the absolute value of the average value of the direct current voltage.
According to the invention, the ripple coefficient is directly calculated through the ripple voltage sampled by the ripple sampling unit and the direct current voltage sampled by the direct current voltage sampling unit, so that the state of a charger in a direct current system can be directly reflected through the ripple coefficient, and the process of a timing test is facilitated to be simplified. And, ripple sampling unit's sampling frequency is very high, can guarantee data acquisition speed, interference signal frequency height problem when having reduced the direct current system direct sampling of use, can calculate ripple voltage and ripple coefficient in real time through ripple voltage sampling unit, direct current voltage sampling unit and the control unit, show the result on liquid crystal display, ripple voltage measuring device is by the test change of timing test real-time supervision into, better guarantee DC power supply's output quality, avoid because the too big harm that probably brings of ripple voltage.
Drawings
Fig. 1 is a schematic structural diagram of a ripple voltage measurement apparatus according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a dc voltage sampling unit in a ripple voltage measurement apparatus according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of ripple sampling in a ripple voltage measurement apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another ripple voltage measurement apparatus provided in the embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an ac voltage sampling unit in a ripple voltage measurement apparatus according to an embodiment of the present invention;
fig. 6 is a flowchart of a ripple voltage measurement method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a ripple voltage measurement apparatus according to an embodiment of the present invention. As shown in fig. 1, the apparatus includes a control unit 120, a ripple sampling unit 130, a dc voltage sampling unit 110, and a display unit 140; the ripple sampling unit 130 and the dc voltage sampling unit 110 are connected to the dc bus, the ripple sampling unit 130 is configured to sample a ripple voltage of the dc bus, and the dc voltage sampling unit 110 is configured to sample a dc voltage of the dc bus; the control unit 120 is connected to the ripple adopting unit and the dc voltage sampling unit 110, and the control unit 120 is configured to determine a ripple voltage coefficient according to the ripple voltage and the dc voltage; the display unit 140 is connected to the control unit 120, and the display unit 140 is configured to display the ripple voltage, the dc voltage, and the ripple voltage coefficient.
Specifically, the control unit 120 may be a central processor, and performs data reception, data analysis, and data transmission. Illustratively, the control unit 120 may adopt an STC12C5410AD single chip microcomputer, which is a high-speed, low-power consumption and ultra-strong anti-interference single chip microcomputer, the instruction code is compatible with the conventional 8051 single chip microcomputer, but the speed is 8-12 times faster than the conventional 8051 single chip microcomputer, and the single chip microcomputer is a single clock or machine cycle single chip microcomputer, and the internal integrated MAX810 dedicated reset circuit has the characteristics of high antistatic performance, 4kV fast pulse interference resistance and the like, and the single chip microcomputer has 8 paths of 10-bit high-speed a/D converters, the speed can reach 100kHz, the rectification output voltage cycle is 300Hz, and the signal sampling requirement is completely met.
The direct current voltage sampling unit 110 is used for sampling the direct current voltage of the direct current bus, and the direct current voltage sampling unit 110 can convert a direct current voltage signal of 0-300V into an A/D conversion input signal of 4-20 mA. For example, when the bus voltage and the bus voltage to ground are abnormally faulty, in the 110V dc system, after the bus voltage reaches the over-voltage warning value 125V or above or the under-voltage warning value 94V or below, the dc voltage signal is converted into an AD conversion input signal greater than 6.67mA or less than 5.01mA, and a digital signal is converted and output to the control unit 120 for numerical judgment. In a 220V dc system, when the bus voltage reaches 253V or higher or 187V or lower, the dc voltage signal is converted into an AD conversion input signal greater than 13.49mA or less than 9.97mA, and a digital signal is converted and output to the control unit 120 for numerical judgment.
Fig. 2 is a schematic circuit diagram of a dc voltage sampling unit in a ripple voltage measurement apparatus according to an embodiment of the present invention. As shown in fig. 2, the dc bus is connected to a first end of a first resistor R1, a second end of a first resistor R1 is connected to a first end of a second resistor R2, a first end of a first diode D1 and a base of a voltage follower VF, the first resistor R1 is a current limiting resistor, which plays a role of limiting current and preventing a large current from impacting a circuit, the second resistor R2 is a voltage dividing resistor, a second end of the second resistor R2 is grounded, a signal is divided by a second resistor R2, which prevents a voltage from being too high and damaging subsequent circuit devices, the first diode D1 and the second diode D2 may be voltage regulators, a second end of the first diode D1 is connected to a first end of a second diode D2, a second end of the second diode D2 is grounded, the first diode D1 and the second diode D2 play a role of overvoltage, the divided signal enters the U1 voltage follower VF to obtain Ua, and the voltage follower VF plays a role of isolating front and rear channels, the emitter of the voltage follower VF is connected to the first end of the third resistor R3, the second end of the third resistor R3 is connected to the non-inverting input end of the non-inverting proportional amplifying circuit, the inverting input end is grounded through the fourth resistor R4, the first end of the fourth resistor R4 is grounded, the first end of the fifth resistor R5 is connected to the second end of the fourth resistor R4, and a feedback signal is introduced through the fifth resistor R5, the dc voltage signal is amplified by the non-inverting proportional amplifying circuit OA at a ratio k1 ═ 1+ (R5/R4), and is converted into a corresponding signal, and then enters the a/D converter in the control unit 120.
The ripple sampling unit 130 is used for sampling the ripple voltage of the dc bus, and may measure the ripple voltage of 0-5V, and preset the values of the ripple voltage and the ripple voltage coefficient, and the data acquisition frequency of the ripple sampling unit 130 may be 1 kHz. Exemplarily, fig. 3 is a schematic circuit diagram of ripple sampling in a ripple voltage measurement apparatus according to an embodiment of the present invention. As shown in fig. 3, the bus signal is divided by a sixth resistor R6, a seventh resistor R7 and a first capacitor C1, a first end of the sixth resistor R6 is connected to a positive dc bus electrode KM + by a first capacitor C1, a second end of the seventh resistor R7 is connected to a negative dc bus electrode KM-, a second end of the sixth resistor R6 and a first end of the seventh resistor R7 are connected to a pin 3 of a voltage holding chip LF1, a pin 1 of the voltage holding chip LF1 is connected to a voltage of +15V, a pin 4 of the voltage holding chip LF1 is connected to a voltage of-15V, a control end 4 of the positive bus operational amplifier circuit LM1 is connected to a pin 3 of the voltage holding chip LF1, a control end 1 of the positive bus operational amplifier circuit LM1 is connected to a voltage of +15V by a pull-up resistor, a control end 1 of the positive bus operational amplifier circuit LM1 is connected to a pin 8 of the voltage holding chip LF1, and a control end 2 of the positive bus operational amplifier circuit 1 is connected to a voltage of +15V, the control end 3 of the positive bus operational amplifier circuit LM1 is connected with a voltage of-15V, and the control end 5 of the positive bus operational amplifier circuit LM1 is connected with a pin 5 of a voltage holding chip LF 1. The first end of the second capacitor C2 is connected to the pin 6 of the voltage-holding chip LF1, the second end of the second capacitor C2 is grounded, the potential of the pin 7 of the voltage-holding chip LF1 is a positive reference voltage, the first photocoupler OC1 is connected to the voltage-holding chip LF1 to provide a reference voltage comparison for the voltage-holding chip LF1, and the pin 5 of the voltage-holding chip LF1 outputs a positive sampling signal PEAK +.
With reference to fig. 3, the second end of the sixth resistor R6 and the first end of the seventh resistor R7 are connected to pin 3 of the voltage-holding chip LF2, pin 1 of the voltage-holding chip LF2 is connected to +15V, pin 4 of the voltage-holding chip LF2 is connected to-15V, the control end 9 of the negative bus operational amplifier circuit LM2 is connected to pin 3 of the voltage-holding chip LF2, the control end 7 of the negative bus operational amplifier circuit LM2 is connected to +15V through a pull-up resistor, the control end 1 of the negative bus operational amplifier circuit LM1 is connected to pin 8 of the voltage-holding chip LF1, the control end 8 of the positive bus operational amplifier circuit LM2 is grounded, and the control end 10 of the negative bus operational amplifier circuit LM2 is connected to pin 5 of the voltage-holding chip LF 1. The first end of the third capacitor C3 is connected to the pin 6 of the voltage-holding chip LF2, the second end of the third capacitor C3 is grounded, and the potential of the pin 7 of the voltage-holding chip LF2 is a negative reference voltage. The second photocoupler OC2 is connected to the voltage holding chip LF2, and provides a reference voltage comparison for the voltage holding chip LF1, and pin 5 of the voltage holding chip LF2 outputs a positive sampling signal PEAK-. The signal input is through positive bus fortune amplifier circuit LM1 and negative bus fortune amplifier circuit LM1, and when the control logic level is higher than reference level, output a low level signal drive switch closure, charge for second electric capacity C2 and third electric capacity C3, provide the maximum voltage that keeps and supply sampling circuit sampling, output positive pole sample signal PEAK +. After one-time sampling is completed, when the control logic level is lower than the voltage of the reference end, a high-level signal is output to drive the switch to be switched off, the photoelectric coupler of the control signal works, the voltage holding chip LF1 controls the second capacitor C2 and the third capacitor C3 of the holding device to discharge, so that the purpose that the original input of the holding device is still kept in the non-sampling time is achieved, the capacitors discharge completely, the ripple sampling circuit continues to sample for the next time, the data acquisition frequency can be 1kHz, and the data acquisition speed is guaranteed.
After acquiring the ripple voltage and the dc voltage, the control unit 120 may calculate a ripple voltage coefficient through an algorithm according to parameter signals transmitted by the ripple sampling module and the dc voltage sampling unit 110, and display the result on the display unit 140, where the display content on the display unit 140 is waveforms of the ac/dc voltage, the ripple voltage, and the ripple voltage coefficient, and the display unit 140 may be, for example, a liquid crystal display screen.
According to the technical scheme of the embodiment, the control unit can directly calculate the ripple coefficient according to the ripple voltage sampled by the ripple sampling unit and the direct current voltage sampled by the direct current voltage sampling unit, so that the state of a charger in the direct current system can be directly reflected through the ripple coefficient, and the process of the timing test can be simplified. And, ripple sampling unit's sampling frequency is very high, can guarantee data acquisition speed, interference signal frequency height problem when having reduced the direct current system direct sampling of use, can calculate ripple voltage and ripple coefficient in real time through ripple voltage sampling unit, direct current voltage sampling unit and the control unit, show the result on liquid crystal display, ripple voltage measuring device is by the test change of timing test real-time supervision into, better guarantee DC power supply's output quality, avoid because the too big harm that probably brings of ripple voltage.
On the basis of the above embodiment, the ripple voltage coefficient includes a ripple voltage effective value coefficient and a ripple voltage peak-to-peak value coefficient; the control unit comprises a ripple voltage effective value coefficient calculation module and a ripple voltage peak-to-peak value coefficient calculation module; the ripple voltage effective value coefficient calculating module is used for calculating a ripple voltage effective value coefficient according to the absolute value of the ripple voltage and the average value of the direct current voltage; the ripple voltage peak-to-peak coefficient calculation module is used for calculating a ripple voltage peak-to-peak coefficient according to the peak-to-valley voltage difference of the ripple voltage and the absolute value of the direct-current voltage average value.
Specifically, the ripple voltage coefficient includes a ripple voltage effective value coefficient and a ripple voltage peak-to-peak value coefficient, and the ripple voltage effective value coefficient and the ripple voltage peak-to-peak value coefficient can visually reflect the state of a charger in the direct current system.
Illustratively, the ripple voltage refers to a voltage amount of an ac component superimposed on a constant dc voltage, and is calculated by the following formula:
in the formula of URCFor ripple voltage content, U (k) is the instantaneous value of the voltage sampling points, m is the total number of sampling points, UDCIs the average value of the DC voltage, UDCThe calculation formula of (2) is as follows:
the ripple voltage effective value coefficient is the ratio of the ripple voltage to the absolute value of the average value of the DC voltage.
The calculation formula of the ripple voltage effective value coefficient is as follows:
in the formula, XUmmFor effective value coefficient of ripple voltage, URCIs the voltage quantity of the superimposed AC component in constant DC voltage, UDCIs the average value of the dc voltage.
The ripple voltage peak-to-peak coefficient refers to the ratio of the difference between the ripple peaks and valleys of the pulsating quantity to the absolute value of the average value of the direct current voltage. U shapeppThe calculation formula of the peak-to-valley difference of the ripple voltage sampling value is as follows:
Upp＝Umax-Umin
in the formula of UmaxTo the maximum value of ripple voltage, UminIs the ripple voltage minimum.
The calculation formula of the ripple voltage peak-to-peak value coefficient is as follows:
in the formula, XUppAs a value of peak-to-peak coefficient of ripple voltage, UppIs the peak-to-valley difference, U, of the ripple voltage sampleDCIs the average value of the dc voltage.
According to the parameter signal transmitted by the ripple sampling module, the ripple voltage and the ripple coefficient are calculated through a ripple voltage measurement algorithm, and the effective value coefficient value of the ripple voltage and the peak-to-peak value coefficient value of the ripple voltage can be calculated in real time.
Fig. 4 is a schematic structural diagram of another ripple voltage measurement apparatus according to an embodiment of the present invention. As shown in fig. 4, the control unit in the ripple voltage measurement apparatus further includes a comparison output module 121; the comparison output module 121 is configured to determine a ripple voltage condition of the dc bus according to the ripple voltage coefficient and a preset ripple voltage coefficient, and output a state signal of the dc bus.
A ripple voltage coefficient is preset in the comparison output module 121, the control unit 120 receives ripple data and compares the ripple data with the preset ripple voltage coefficient, if the ripple voltage coefficient is calculated to be smaller than the preset ripple voltage coefficient, it indicates that the ripple voltage in the dc bus is smaller, the operating state of the dc bus is normal, the control unit continues to receive new data, if the ripple voltage coefficient is calculated to be larger than the preset ripple voltage coefficient, the state signal of the dc bus is abnormal, and when the ripple voltage coefficient is larger than the preset ripple voltage coefficient, a series of adverse effects may be generated, illustratively, the ripple may cause generation of surge voltage current, which may cause malfunction or burnout of a relay of secondary equipment of the power system; the ripple wave can cause the relay protection central signal device and the high-frequency relay protection to mistakenly send signal tripping, and the power failure of the whole plant or the whole station can be caused when the power failure is serious; the ripple wave can reduce the voltage endurance capability and the service life of the electronic plate, interfere the logic relation of the digital circuit and the normal work of the A/D conversion plate; the ripple wave can affect the service life of the storage battery, so that the service life of the storage battery is reduced; the ripple will bring the interference of noise, make image equipment, sound equipment unable normal work.
With continued reference to fig. 4, the ripple voltage measurement apparatus further includes an alarm unit 150; the alarm unit 150 is connected to the comparison output module, and the alarm unit 150 is configured to output an alarm signal and an alarm node signal when the status signal of the dc bus is an abnormal signal.
When the comparison output module 121 calculates that the ripple voltage coefficient is greater than the preset ripple voltage coefficient, the alarm unit 150 receives the signal sent by the comparison output module, and may output an alarm signal through the alarm node, and the LED lamp and the buzzer alarm, and monitor the voltage state of the dc bus in real time.
With continued reference to fig. 4, the ripple voltage measurement apparatus further includes an ac voltage sampling unit 160; the ac voltage sampling unit 160 is connected to the dc bus, and the ac voltage sampling unit 160 is used to sample the ac voltage of the low-voltage ac directly flowing into the dc system.
Specifically, the ac voltage sampling unit 160 is used for measuring and sampling ac voltage, and converts an ac voltage signal of 0-300V into an a/D conversion input signal of 4-20mA, and when ac current flows into a dc system, the ac voltage sampled by the ac voltage sampling unit 160 is higher, and the a/D conversion input signal converted by the ac voltage sampling unit is larger. The control unit 120 is connected to the ac voltage sampling unit 160, and is configured to determine the magnitude of the ac voltage according to the a/D conversion input signal, so that an alarm may be triggered when the ac voltage is relatively large, the time of the fault occurrence, the ac inflow voltage, and the alarm voltage curve are recorded, an alarm is output through an alarm node set by the alarm module, an ac inflow alarm recording function is implemented, and the recording response time is less than 20 ms. For example, when the ac voltage sampled by the ac voltage sampling unit 160 is higher than 10V, the converted a/D conversion input signal is greater than or equal to 0.53mA, and the control unit 120 receives the AD conversion input signal greater than 0.53mA, an alarm may be triggered.
Fig. 5 is a schematic circuit diagram of an ac voltage sampling unit in a ripple voltage measurement apparatus according to an embodiment of the present invention. As shown in fig. 5, the dc bus signal is divided by an eighth resistor R8, a ninth resistor R9 and a fourth capacitor C4, a first end of the eighth resistor R8 is connected to the dc bus, a second end of the eighth resistor R8 is connected to a first end of the fourth capacitor C4 and a first end of the tenth resistor R10, a first end of the ninth resistor R9 is connected to a second end of the fourth capacitor C4, a second end of the ninth resistor R9 is grounded, the ac signal detected from the negative bus generates a voltage signal by the eighth resistor R8, and the voltage signal passes through the fourth capacitor C4 and the ninth resistor R9 to perform high-pass filtering. The second end of the tenth resistor R10 is connected with the first end of the third photoelectric coupler OC3, the second end of the third photoelectric coupler OC3 is grounded, the third end of the third photoelectric coupler OC3 is connected with the fourth end of the 15V voltage third photoelectric coupler OC3 and the first end of the fifth capacitor C5, the photoelectric coupling isolation circuit is mainly used for isolating a high-frequency circuit from a low-frequency circuit, and a high-frequency signal generated by the high-frequency circuit can interfere with the low-frequency circuit. The second end of the fifth capacitor C5 is connected to the first end of the eleventh resistor R11, the second end of the eleventh resistor R11 is connected to the first end of the operational amplifier OP, the fifth capacitor C5 and the eleventh resistor R11 isolate the direct current, and transmit the alternating current voltage signal to the operational amplifier OP, the second end of the operational amplifier OP is grounded through the thirteenth resistor R13, the first end of the twelfth resistor R13 is connected to the first end of the operational amplifier OP, the second end of the twelfth resistor R13 is connected to the third end of the operational amplifier OP, the operational amplifier OP is used for signal amplification, and converts the alternating current voltage signal into a direct current voltage signal in an AC/DC circuit, and outputs the direct current voltage signal to the control unit 120.
With continued reference to fig. 4, the ripple voltage measurement apparatus further includes a communication unit 170; the communication unit 170 is connected to the control unit, and the communication unit 170 is used for realizing communication of the control unit 120.
Illustratively, the control unit 120 is interfaced with the communication unit 170 and is provided with an 8-bit shift register, which can ensure the accuracy of data transmission and improve the reliability of data transmission, the communication mode can be realized by adopting serial communication or a 485 communication port, the control unit 120 is used to link the communication unit 170 with the signals output by the dc voltage sampling unit 110, the ripple sampling unit 130 and the ac voltage sampling unit 160, and then the acquired data is transmitted to the control unit 120 according to the channel sequence.
With continued reference to fig. 4, the ripple voltage measurement apparatus further includes a power supply unit 180; the power supply unit 180 is connected to the control unit 120, the ripple sampling unit 130, the dc voltage sampling unit 110, and the display unit 140, and is configured to provide power to the control unit 120, the ripple sampling unit 130, the dc voltage sampling unit 110, and the display unit 140.
The power supply can be an external power supply or a battery, and the stability of power supply of the system is guaranteed.
The embodiment of the invention also provides a ripple voltage measuring method. Fig. 6 is a flowchart of a ripple voltage measurement method according to an embodiment of the present invention. The present embodiment is applicable to the case of ripple voltage measurement, and the method may be executed by the ripple voltage measurement provided in any embodiment of the present invention, as shown in fig. 6, specifically including the following steps: the method comprises the following steps:
s10, acquiring direct current voltage and ripple voltage of the direct current bus;
s20, determining a ripple voltage coefficient according to the direct current voltage and the ripple voltage;
and S30, displaying the ripple voltage, the direct current voltage and the ripple voltage coefficient.
According to the technical scheme, the direct-current voltage and the ripple voltage of the direct-current bus are firstly obtained, and then the ripple coefficient is directly calculated according to the ripple voltage and the direct-current voltage, so that the state of a charger in a direct-current system can be directly reflected through the ripple coefficient, and the process of a timing test is facilitated to be simplified. And, the sampling frequency of ripple voltage is very high, can guarantee data acquisition speed, has reduced the interference signal frequency height problem when using direct current system direct sampling, can calculate ripple voltage and ripple coefficient in real time through ripple voltage and direct current voltage, changes into real-time supervision by the test of timing test, and the output quality of better guarantee DC power supply avoids because the too big harm that probably brings of ripple voltage.
On the basis of the above embodiment, determining the ripple voltage coefficient according to the dc voltage and the ripple voltage includes: calculating a ripple voltage effective value coefficient according to the absolute value of the ripple voltage and the average value of the direct current voltage; and calculating the peak-to-peak coefficient of the ripple voltage according to the peak-to-valley voltage difference of the ripple voltage and the absolute value of the average value of the direct current voltage.
Optionally, the ripple voltage coefficient includes a ripple voltage effective value coefficient and a ripple voltage peak-to-peak value coefficient; determining a ripple voltage coefficient according to the direct current voltage and the ripple voltage, comprising:
calculating a ripple voltage effective value coefficient according to the absolute value of the ripple voltage and the average value of the direct current voltage;
and calculating the peak-to-peak coefficient of the ripple voltage according to the peak-to-valley voltage difference of the ripple voltage and the absolute value of the average value of the direct current voltage.
Optionally, the calculation formula of the ripple voltage effective value coefficient is as follows:
in the formula, XUmmFor effective value coefficient of ripple voltage, URCIs the voltage quantity of the superimposed AC component in constant DC voltage, UDCIs the average value of the dc voltage.
The calculation formula of the ripple voltage peak-to-peak value coefficient is as follows:
in the formula, XUppIs the ripple voltage peak-to-peak coefficient, UppIs the peak-to-valley difference, U, of the ripple voltage sampleDCIs the average value of the dc voltage.
Optionally, determining the ripple voltage coefficient according to the dc voltage and the ripple voltage includes:
and judging the ripple voltage condition of the direct current bus according to the ripple voltage coefficient and a preset ripple voltage coefficient, and outputting a state signal of the direct current bus.
Optionally, after determining the ripple voltage coefficient according to the dc voltage and the ripple voltage, the method further includes:
and outputting an alarm signal and an alarm node signal when the state signal of the direct current bus is an abnormal signal.
Optionally, when acquiring the dc voltage and the ripple voltage of the dc bus, the method further includes: and acquiring the alternating voltage directly flowing into the direct current system according to the sampled low-voltage alternating current.
Optionally, after displaying the ripple voltage, the dc voltage, and the ripple voltage coefficient, the method further includes: and realizing the communication of the control unit.
Optionally, before acquiring the dc voltage and the ripple voltage of the dc bus, the method further includes:
and power supplies are provided for the control unit, the ripple sampling unit, the direct current voltage sampling unit and the display unit.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114660354A (en) * | 2022-03-29 | 2022-06-24 | 南方电网科学研究院有限责任公司 | Voltage ripple detection device, method and equipment based on alternate sampling |
| CN115372685A (en) * | 2022-07-29 | 2022-11-22 | 东莞市华博精测仪表科技有限公司 | Voltage measurement method, voltage measurement device and test pencil |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04252505A (en) * | 1991-01-29 | 1992-09-08 | Fujitsu Ltd | Power supply ripple measurement device |
| CN202929087U (en) * | 2012-09-17 | 2013-05-08 | 比亚迪股份有限公司 | A DC component detection device |
| CN103427485A (en) * | 2013-09-09 | 2013-12-04 | 国家电网公司 | Device used for detecting direct current power supply connected to alternating current power supply and direct current power supply ripples and used in transformer substation |
| CN203773034U (en) * | 2013-11-15 | 2014-08-13 | 广州优维电子科技有限公司 | Testing device of direct-current ripple system |
| CN105759125A (en) * | 2016-05-25 | 2016-07-13 | 国网河南省电力公司济源供电公司 | Device for monitoring invasion into direct current by alternating current based on ripple analysis |
| CN105954618A (en) * | 2016-05-19 | 2016-09-21 | 国网河南省电力公司济源供电公司 | AC invasion DC monitoring method based on ripple analysis |
| CN105959010A (en) * | 2016-04-29 | 2016-09-21 | 成都易创思生物科技有限公司 | Peak holding circuit |
| CN107783062A (en) * | 2017-11-27 | 2018-03-09 | 厦门亿联网络技术股份有限公司 | A kind of ripple determiner |
| CN108132444A (en) * | 2017-12-20 | 2018-06-08 | 广州勤正电力科技有限公司 | Direct current ripple coefficient test device |
| CN207937582U (en) * | 2017-09-28 | 2018-10-02 | 四川法拉第电子科技有限公司 | A monitoring device for alternating current intrusion into direct current |
| CN209417136U (en) * | 2019-01-15 | 2019-09-20 | 广西电网有限责任公司北海供电局 | A circuit for measuring transient voltage |
| CN111366785A (en) * | 2020-04-02 | 2020-07-03 | 南方电网电动汽车服务有限公司 | Insulation monitoring circuit and method for direct current charging pile |
| CN111398844A (en) * | 2020-03-10 | 2020-07-10 | 深圳供电局有限公司 | Ripple peak sampling circuit and direct current system monitoring device |
-
2021
- 2021-09-15 CN CN202111079343.8A patent/CN113834965A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04252505A (en) * | 1991-01-29 | 1992-09-08 | Fujitsu Ltd | Power supply ripple measurement device |
| CN202929087U (en) * | 2012-09-17 | 2013-05-08 | 比亚迪股份有限公司 | A DC component detection device |
| CN103427485A (en) * | 2013-09-09 | 2013-12-04 | 国家电网公司 | Device used for detecting direct current power supply connected to alternating current power supply and direct current power supply ripples and used in transformer substation |
| CN203773034U (en) * | 2013-11-15 | 2014-08-13 | 广州优维电子科技有限公司 | Testing device of direct-current ripple system |
| CN105959010A (en) * | 2016-04-29 | 2016-09-21 | 成都易创思生物科技有限公司 | Peak holding circuit |
| CN105954618A (en) * | 2016-05-19 | 2016-09-21 | 国网河南省电力公司济源供电公司 | AC invasion DC monitoring method based on ripple analysis |
| CN105759125A (en) * | 2016-05-25 | 2016-07-13 | 国网河南省电力公司济源供电公司 | Device for monitoring invasion into direct current by alternating current based on ripple analysis |
| CN207937582U (en) * | 2017-09-28 | 2018-10-02 | 四川法拉第电子科技有限公司 | A monitoring device for alternating current intrusion into direct current |
| CN107783062A (en) * | 2017-11-27 | 2018-03-09 | 厦门亿联网络技术股份有限公司 | A kind of ripple determiner |
| CN108132444A (en) * | 2017-12-20 | 2018-06-08 | 广州勤正电力科技有限公司 | Direct current ripple coefficient test device |
| CN209417136U (en) * | 2019-01-15 | 2019-09-20 | 广西电网有限责任公司北海供电局 | A circuit for measuring transient voltage |
| CN111398844A (en) * | 2020-03-10 | 2020-07-10 | 深圳供电局有限公司 | Ripple peak sampling circuit and direct current system monitoring device |
| CN111366785A (en) * | 2020-04-02 | 2020-07-03 | 南方电网电动汽车服务有限公司 | Insulation monitoring circuit and method for direct current charging pile |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114660354A (en) * | 2022-03-29 | 2022-06-24 | 南方电网科学研究院有限责任公司 | Voltage ripple detection device, method and equipment based on alternate sampling |
| CN115372685A (en) * | 2022-07-29 | 2022-11-22 | 东莞市华博精测仪表科技有限公司 | Voltage measurement method, voltage measurement device and test pencil |
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