CN110967572A - On-vehicle pulse power source voltage current fault rapid detection device - Google Patents
On-vehicle pulse power source voltage current fault rapid detection device Download PDFInfo
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- CN110967572A CN110967572A CN201910834024.XA CN201910834024A CN110967572A CN 110967572 A CN110967572 A CN 110967572A CN 201910834024 A CN201910834024 A CN 201910834024A CN 110967572 A CN110967572 A CN 110967572A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- 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
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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
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- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a voltage and current fault rapid detection device for a vehicle-mounted pulse power source, which comprises: the voltage dividing circuit is connected in parallel at two ends of the energy storage capacitor and used for collecting the divided voltage of the energy storage capacitor; the current divider circuit is connected in series in the energy storage capacitor charging main circuit, and is used for collecting the current of the charging circuit and converting the current into voltage; the fast comparison circuit respectively compares the output voltages of the voltage divider circuit and the current divider circuit with respective preset reference voltages, and outputs an alarm signal when the output voltage of the voltage divider circuit or the current divider circuit is higher than the respective preset reference voltage; the alarm is connected with the output end of the rapid comparison circuit and alarms when an alarm signal is available; the auxiliary power supply circuit provides different adjustable voltages for supplying power to the fast comparison circuit and providing a preset reference voltage. The fault diagnosis mechanism of the invention is a high-speed voltage comparator, and can directly detect voltage and current faults by a hardware circuit.
Description
Technical Field
The invention relates to a pulse power source measurement technology, in particular to a device and a method for rapidly detecting voltage and current faults of a vehicle-mounted pulse power source.
Background
With the development of the pulse power supply technology, the requirement on the emission frequency of the cannonball is higher and higher, the repetition frequency of the pulse power supply can reach 6 times in one minute at present, and higher frequency is realized in the future. Under such high requirements, the reliability requirements on the charging voltage and current of the pulse power source are higher and higher, and if the voltage or the current is too large, the IGBT can be damaged or even exploded, and the personal safety of operators is threatened. Therefore, a voltage and current detection mechanism in the charging process of the pulse power source is established. Chinese patent CN109358250 discloses a power supply vehicle boost conversion rapid detection device software and a boost conversion rapid detection device, which uses a voltage transformer and a current transformer to collect voltage and current at the side of an energy storage capacitor, inputs the voltage and current into a CPU after AD conversion, and then uses the CPU to perform judgment.
Disclosure of Invention
The invention aims to provide a device and a method for rapidly detecting voltage and current faults of a vehicle-mounted pulse power source.
The technical solution for realizing the purpose of the invention is as follows: the utility model provides a quick detection device of on-vehicle pulse power source voltage current fault, sets up voltage bleeder circuit, current bleeder circuit, quick comparison circuit, warning circuit and auxiliary power supply in energy storage capacitor and charging circuit periphery, wherein:
the voltage divider circuit is connected in parallel at two ends of the energy storage capacitor and used for collecting the divided voltage of the energy storage capacitor, and the output end of the voltage divider circuit is connected with the rapid comparison circuit;
the current divider circuit is connected in series in the energy storage capacitor charging main circuit and used for collecting the current of the charging circuit and converting the current into voltage, and the output end of the current divider circuit is connected with the fast comparison circuit;
the rapid comparison circuit is used for comparing the output voltages of the voltage division circuit and the current division circuit with a preset reference voltage, and when the output voltage of the voltage division circuit or the current division circuit is higher than the preset reference voltage, an alarm signal is output, and the output end of the rapid comparison circuit is connected with the alarm;
the alarm is connected with the output end of the rapid comparison circuit and alarms when an alarm signal is available;
the auxiliary power supply circuit provides different adjustable voltages for supplying power to the fast comparison circuit and providing a preset reference voltage.
A method for rapidly detecting voltage and current faults of a vehicle-mounted pulse power source comprises the following steps:
the voltage dividing circuit acquires a divided voltage V1 of the energy storage capacitor;
the current divider circuit collects charging current and converts the charging current into voltage V2;
the rapid comparison circuit compares the output voltage V1 of the voltage division circuit with a first preset reference voltage V11, compares the output voltage V2 of the current division circuit with a second preset reference voltage, and outputs an alarm signal if the output voltage of the voltage division circuit or the current division circuit is higher than the preset reference voltage;
and the alarm gives an alarm when an alarm signal is available.
Compared with the prior art, the invention has the advantages that: according to the invention, a voltage transformer is not needed to be adopted for measuring voltage, a current transformer is not needed to be adopted for measuring current, AD conversion and CPU comparison are not needed, the fault diagnosis mechanism is a high-speed voltage comparator, and voltage and current faults are directly detected by a hardware circuit.
Drawings
FIG. 1 is a schematic diagram of a method for rapidly detecting voltage and current faults of a vehicle-mounted pulse power source according to the present invention.
Fig. 2 is a circuit diagram of the voltage divider circuit and the current divider circuit according to the present invention.
FIG. 3 is a circuit diagram of the fast comparison circuit of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
A voltage and current fault rapid detection device for a vehicle-mounted pulse power source is characterized in that a voltage division circuit 20, a current division circuit 30, a rapid comparison circuit 40, an alarm circuit 50 and an auxiliary power supply 60 are arranged on the periphery of an energy storage circuit 10 and the periphery of a charging circuit, wherein:
the voltage divider circuit 20 is connected in parallel at two ends of the energy storage capacitor 10, collects the divided voltage of the energy storage capacitor 10, and the output end is connected with the fast comparison circuit 40;
the current divider circuit 30 is connected in series in the charging trunk of the energy storage capacitor 10, collects the voltage of the charging circuit, and the output end is connected with the fast comparison circuit 40;
the fast comparison circuit 40 compares the output voltages of the voltage division circuit 20 and the current division circuit 30 with a preset reference voltage, and when the output voltage of the voltage division circuit 20 or the current division circuit 30 is higher than the preset reference voltage, an alarm signal is output, and the output end is connected with the alarm 50;
the alarm 50 is connected with the output end of the rapid comparison circuit 40 and gives an alarm when an alarm signal is available;
the auxiliary power supply circuit 60 provides different adjustable voltages for powering the fast comparison circuit 40 and for providing a preset reference voltage.
The utility model provides a quick detection device of voltage current fault of on-vehicle pulse power source, includes energy storage capacitor, voltage divider circuit, current divider circuit, quick comparison circuit, alarm and auxiliary power supply, wherein:
the voltage V1 acquired by the voltage dividing circuit is directly connected to the rapid comparison circuit and is used for dividing the voltage value of the energy storage capacitor and transmitting the divided voltage value.
The voltage V2 acquired by the current divider circuit is directly connected to the fast comparison circuit and used for converting a current value into a voltage value in the charging process and transmitting the divided voltage value.
And the output end of the rapid comparison circuit is connected with the alarm and used for comparing the voltage of the voltage division circuit with a preset reference voltage and outputting a result. When the voltage is higher than the preset voltage, the fast comparison circuit outputs a signal. The alarm is connected with the output of the rapid comparison circuit, and when an output signal is output, the alarm is given. The auxiliary power supply provides a preset voltage in the fast comparison circuit.
As shown in FIG. 2, the voltage divider circuit 20 isA first resistor R1 and a second resistor R2 connected in series. The output of the voltage divider circuit is a voltage between R1 and R2, and the output V1 is connected to the positive input end of the voltage comparator AR 1. Considering the problems of insulation performance and structure of the resistance meter, insulation performance and leakage current, the voltage dividing resistance should be 108Of the order of omega or above. The size of V1 is known as:
wherein R is1、R2Divided into resistances of precision resistors R1, R2, UC1The voltage value of the energy storage capacitor C1. Due to R1、R2The size is fixed, so that V is known1And UC1In direct proportional relationship, by V1I.e. the voltage over the energy storage capacitor C1. For the maximum voltage allowed to charge, only U needs to be taken into the above formulaC1And calculating to obtain the value of the preset voltage V11.
The current dividing circuit 30 includes a precision resistor R3, an operational amplifier H1, and four resistors R4, R5, R6, and R7(R4 ═ R5 ═ R6 ═ R7). The four resistors R4, R5, R6 and R7 and the operational amplifier H1 form a subtraction operation circuit. The output V2 is the potential difference across the precision resistor R3. The inverting input end of the operational amplifier H1 is electrically connected with one end of R5 and R7, the homonymous input end is electrically connected with one end of R6 and R4, and the output end is electrically connected with one end of an OR gate; one end of the R4 is electrically connected with the positive input end of the operational amplifier H1, and the other end is grounded; one end of R5 is electrically connected to the inverting input of operational amplifier H1, and the other end is electrically connected to the low voltage side of R3; one end of R6 is electrically connected to the positive input terminal of operational amplifier H1, and the other end is electrically connected to the high voltage side of R3; one end of R7 is electrically connected to the inverting input terminal of operational amplifier H1, and the other end is electrically connected to the output terminal of operational amplifier H1. It can be seen that the output V2 has the following magnitude:
V2＝IR3
wherein I is the current passing through a resistor R3 in the trunk circuit, and R is3The resistance value of the precision resistor R3. Since the precision resistor R3 is fixed in size,it is understood that the magnitude of the output V2 is proportional to the current I, and that the larger the current, the larger V2. For the maximum allowed current, the value of the preset voltage V22 can be obtained by only carrying out calculation by carrying the formula I.
As shown in fig. 3, the fast comparison circuit 40 includes a first comparator AR1, a second comparator AR2 and a high-speed or gate U1, a positive input terminal of the AR1 is connected to the output V1 of the voltage divider circuit, a negative input terminal of the AR1 is connected to the auxiliary power circuit 60, the auxiliary power circuit provides a first preset reference voltage V11, a positive input terminal of the AR2 is connected to the output V2 of the voltage divider circuit, the negative input terminal of the AR 3560 is connected to the auxiliary power circuit, the auxiliary power circuit provides a second preset reference voltage V22, output terminals of the AR1 and the AR2 are respectively connected to two ports of the same or gate U1, and an output terminal of the or gate is connected to the alarm. In a preferred embodiment, the first comparator (AR1) and the second comparator (AR2) are isolated high-speed voltage comparators.
According to the method for rapidly detecting the voltage and current faults of the vehicle-mounted pulse power source based on the device, before the vehicle-mounted pulse power source starts to charge, two preset voltages need to be set, one preset voltage is used for comparing the output of the voltage division circuit, and the other preset voltage is used for comparing the output of the current division circuit. The preset voltages V11 and V22 are calculated according to the maximum voltage value and the maximum current value of the alarm required in practice. When the vehicle-mounted pulse power source starts to charge, if the voltage of the energy storage capacitor is normal and the charging current is normal, the rapid comparison circuit does not output and the alarm does not act. When the voltage of the energy storage capacitor exceeds the maximum value, or the charging current exceeds the maximum value, or the voltage and the charging current both occur, the high-speed comparison circuit outputs a signal, and the alarm acts.
According to the invention, the voltage is not required to be measured by using a voltage transformer, AD conversion is not required to be carried out on the measured voltage value, comparison by a CPU is not required, the charging voltage and current abnormity can be judged only by a voltage division circuit and a voltage comparator, the detection speed is high, and the structure is simple.
Claims (10)
1. The utility model provides a quick detection device of on-vehicle pulse power source voltage current fault which characterized in that sets up voltage bleeder circuit (20), current bleeder circuit (30), quick comparison circuit (40), warning circuit (50) and auxiliary power supply (60) in energy storage capacitor (10) and charging circuit periphery, wherein:
the voltage dividing circuit (20) is connected in parallel at two ends of the energy storage capacitor (10) and is used for collecting the divided voltage of the energy storage capacitor (10), and the output end of the voltage dividing circuit is connected with the rapid comparison circuit (40);
the current divider circuit (30) is connected in series in a charging main circuit of the energy storage capacitor (10) and used for collecting the current of the charging circuit and converting the current into voltage, and the output end of the current divider circuit is connected with the rapid comparison circuit (40);
the rapid comparison circuit (40) is used for comparing the output voltage of the voltage division circuit (20) and the current division circuit (30) with a preset reference voltage, when the output voltage of the voltage division circuit (20) or the current division circuit (30) is higher than the preset reference voltage, an alarm signal is output, and the output end is connected with the alarm (50);
the alarm (50) is connected with the output end of the rapid comparison circuit (40) and alarms when an alarm signal is available;
the auxiliary power supply circuit (60) provides different adjustable voltages for powering the fast comparison circuit (40) and for providing a preset reference voltage.
2. The vehicle-mounted pulse power source voltage and current fault rapid detection device according to claim 1, wherein the voltage dividing circuit (20) comprises a first resistor (R1) and a second resistor (R2), the first resistor (R1) and the second resistor (R2) are connected in series and then connected in parallel to two ends of the energy storage capacitor (10), and a connection end of the first resistor (R1) and the second resistor (R2) is an output end.
3. The vehicle-mounted pulse power source voltage current fault rapid detection device according to claim 2, characterized in that the first resistor (R1) and the second resistor (R2) are 10 degrees8Of the order of omega or above.
4. The vehicle-mounted pulse power source voltage and current fault rapid detection device according to claim 1, wherein the current divider circuit (30) comprises a first operational amplifier (H1), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6) and a seventh resistor (R7), the third resistor (R3) is connected in series in a charging main circuit of the energy storage capacitor (10), an inverting input end of the first operational amplifier (H1) is connected with one ends of the fifth resistor (R5) and the seventh resistor (R7), a same-direction input end of the first operational amplifier is connected with one ends of the sixth resistor (R6) and the fourth resistor (R4), and an output end of the first operational amplifier is connected with the rapid comparison circuit (40); one end of the fourth resistor (R4) is connected with the positive input end of the first operational amplifier (H1), and the other end of the fourth resistor (R4) is grounded; one end of the fifth resistor (R5) is connected with the inverting input end of the first operational amplifier (H1), and the other end is connected with the low-voltage side of the third resistor (R3); one end of the sixth resistor (R6) is connected with the positive input end of the first operational amplifier (H1), and the other end is connected with the high voltage side of the third resistor (R3); one end of the seventh resistor (R7) is connected with the inverting input end of the first operational amplifier H1, and the other end is connected with the output end of the first operational amplifier (H1).
5. The vehicle-mounted pulse power source voltage and current fault rapid detection device according to claim 4, characterized in that the fourth resistor (R4), the fifth resistor (R5), the sixth resistor (R6) and the seventh resistor (R7) are equal in resistance.
6. The vehicle-mounted pulse power source voltage current fault rapid detection device according to claim 1, wherein the rapid comparison circuit (40) comprises a first comparator (AR1), a second comparator (AR2) and a high-speed OR gate (U1), a positive input end of the first comparator (AR1) is connected with an output end of the voltage divider circuit (20), a negative input end of the first comparator is connected with the auxiliary power source circuit (60), and an output end of the first comparator is connected with the high-speed OR gate (U1); the positive input end of the second comparator (AR2) is connected with the output end of the current divider circuit (30), the negative input end of the second comparator is connected with the auxiliary power supply circuit (60), the output end of the second comparator is connected with a high-speed OR gate (U1), and the output end of the high-speed OR gate (U1) is connected with the alarm (50).
7. The vehicle-mounted pulse power source voltage current fault rapid detection device according to claim 6, wherein the first comparator (AR1) and the second comparator (AR2) are voltage comparators with isolation.
8. A method for rapidly detecting voltage and current faults of a vehicle-mounted pulse power source is characterized by comprising the following steps:
the voltage dividing circuit (20) collects the divided voltage V1 of the energy storage capacitor (10);
the current divider circuit (30) collects charging current and converts the charging current into voltage V2;
the rapid comparison circuit (40) compares the output voltage V1 of the voltage division circuit (20) with a first preset reference voltage V11, compares the output voltage V2 of the current division circuit (30) with a second preset reference voltage, and outputs an alarm signal if the output voltage of the voltage division circuit (20) or the current division circuit (30) is higher than the preset reference voltage;
the alarm (50) gives an alarm when an alarm signal is available.
9. The method for rapidly detecting the voltage and current faults of the vehicle-mounted pulse power source according to claim 8, wherein the divided voltage V1 of the energy storage capacitor (10) is as follows:
wherein R is1、R2Divided into resistance values of first and second resistors (R1, R2), UC1Is the voltage value of the energy storage capacitor (C1) due to R1、R2Fixed size, known as V1And UC1In direct proportional relationship, by V1The voltage on the energy storage capacitor (C1) can be reflected, and for the maximum voltage allowed to be charged, only the voltage is carried into U in the formulaC1And calculating to obtain the value of the preset voltage V11.
10. The method for rapidly detecting the voltage and current faults of the vehicle-mounted pulse power source according to claim 8, wherein the voltage V2 converted from the charging current is as follows:
V2＝IR3
wherein I is the current magnitude passing through the third resistor (R3) in the trunk, and R is3Since the magnitude of R3 is fixed, it can be known that the magnitude of output V2 is proportional to current I, and when the current is larger, V2 is also larger, and for the maximum current allowed to pass through, I in the above formula is only needed to be substituted for calculation, so that the value of preset voltage V22 can be obtained.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910834024.XA CN110967572A (en) | 2019-09-04 | 2019-09-04 | On-vehicle pulse power source voltage current fault rapid detection device |
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| CN201910834024.XA CN110967572A (en) | 2019-09-04 | 2019-09-04 | On-vehicle pulse power source voltage current fault rapid detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948443A (en) * | 2020-08-26 | 2020-11-17 | 环胜电子(深圳)有限公司 | Current early warning system and method capable of detecting power supply power |
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| CN104330617A (en) * | 2014-10-29 | 2015-02-04 | 安徽四创电子股份有限公司 | High-accuracy pulse power detection module |
| CN105207515A (en) * | 2015-09-16 | 2015-12-30 | 深圳市航天新源科技有限公司 | Repetition frequency pulse power current source |
| KR20170119248A (en) * | 2016-04-18 | 2017-10-26 | 엘에스산전 주식회사 | Analog signal detecting circuit |
| CN208902788U (en) * | 2018-07-11 | 2019-05-24 | 南京创佳通讯电源设备有限公司 | A kind of current detection circuit of switching circuit |
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2019
- 2019-09-04 CN CN201910834024.XA patent/CN110967572A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545688A (en) * | 2011-12-12 | 2012-07-04 | 中国电力科学研究院 | Power pulse generation device, drive method, and high-voltage wire electricity getting method |
| CN104330617A (en) * | 2014-10-29 | 2015-02-04 | 安徽四创电子股份有限公司 | High-accuracy pulse power detection module |
| CN105207515A (en) * | 2015-09-16 | 2015-12-30 | 深圳市航天新源科技有限公司 | Repetition frequency pulse power current source |
| KR20170119248A (en) * | 2016-04-18 | 2017-10-26 | 엘에스산전 주식회사 | Analog signal detecting circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111948443A (en) * | 2020-08-26 | 2020-11-17 | 环胜电子(深圳)有限公司 | Current early warning system and method capable of detecting power supply power |
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Application publication date: 20200407 |