CN214069550U - Overcurrent detection protection device for vehicle electrical equipment - Google Patents
Overcurrent detection protection device for vehicle electrical equipment Download PDFInfo
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- CN214069550U CN214069550U CN202023230460.3U CN202023230460U CN214069550U CN 214069550 U CN214069550 U CN 214069550U CN 202023230460 U CN202023230460 U CN 202023230460U CN 214069550 U CN214069550 U CN 214069550U
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Abstract
The utility model relates to an over-current detection protection device for vehicle electric equipment, which comprises a voltage conversion unit, a comparator unit and a power-off protection unit, wherein the comparator unit comprises a first comparator, a second comparator and a charging circuit, the voltage conversion unit converts the current signal of the vehicle electric equipment into a voltage signal, the voltage conversion unit outputs the voltage signal to the first comparator, when the voltage signal output by the voltage conversion unit is greater than the first comparison voltage, the current ratio of the vehicle electric equipment is larger, the output end of the first comparator outputs a high level signal, the output end of the first comparator is connected with the charging end of the charging circuit to charge the charging circuit, the charging circuit is arranged, the voltage output end of the second comparator can output voltage when the current ratio of the vehicle electric equipment is larger and lasts for a certain time, thereby avoiding false triggering, the false triggering protection is realized, the detection accuracy is improved, and the condition of false judgment is avoided.
Description
Technical Field
The utility model relates to a vehicle consumer overflows detection protection device.
Background
Be provided with multiple consumer in the vehicle, the safe operation of vehicle is decided to the normal safe operation of each consumer, and current vehicle consumer overflows the detection principle that detects protection device and does: and detecting the current of the electric equipment, and cutting off the power supply of the electric equipment when the current value of the electric equipment is higher than a set value. However, in the normal operation process of the electric equipment, a current spike may occur in a very short time, which belongs to a normal condition and should not be judged as an overcurrent fault, but the existing over-current detection protection device for the vehicle electric equipment can judge as an overcurrent and further cut off the power supply of the electric equipment. Therefore, the existing overcurrent detection protection device for the vehicle electric equipment has poor detection accuracy, and the condition of misjudgment may occur.
SUMMERY OF THE UTILITY MODEL
The utility model provides a vehicle consumer overflows detection protection device for solve current vehicle consumer and overflow detection protection device's the relatively poor technical problem of detection accuracy.
An over-current detection protection device for a vehicle electric device, comprising:
the voltage conversion unit is used for converting the collected current signals of the vehicle electric equipment into corresponding voltage signals;
the comparator unit comprises a first comparator, a second comparator and a charging circuit, wherein the output end of the voltage conversion unit is connected with the first input end of the first comparator, the second input end of the first comparator is used for inputting a first comparison voltage, the output end of the first comparator is connected with the charging end of the charging circuit, the charging end of the charging circuit is connected with the third input end of the second comparator, and the fourth input end of the second comparator is used for inputting a second comparison voltage; and
and the power-off protection unit is used for controlling whether the vehicle electric equipment is powered off or not according to the voltage output by the output end of the second comparator, and the output end of the second comparator is connected with the input end of the power-off protection unit.
Furthermore, the comparator unit further includes a first comparison voltage output circuit, the first comparison voltage output circuit includes a first voltage division branch, one end of the first voltage division branch is used for connecting a power supply, the other end of the first voltage division branch is grounded, a first potentiometer is connected in series on the first voltage division branch, and a voltage regulation end of the first potentiometer is connected to a second input end of the first comparator and is used for outputting the first comparison voltage.
Further, the comparator unit further includes a second comparison voltage output circuit, the second comparison voltage output circuit includes a second voltage division branch, one end of the second voltage division branch is used for connecting a power supply, the other end of the second voltage division branch is grounded, a second potentiometer is connected in series on the second voltage division branch, and a voltage regulation end of the second potentiometer is connected with a fourth input end of the second comparator and is used for outputting the second comparison voltage.
Furthermore, the charging circuit comprises a capacitor branch circuit, the capacitor branch circuit comprises a capacitor or at least two capacitors arranged in parallel, one end of the capacitor branch circuit is grounded, and the other end of the capacitor branch circuit is a charging end of the charging circuit.
Further, the power-off protection unit includes switch tube and relay, the relay includes control coil and normally closed contact switch, the control end of switch tube does the input of power-off protection unit, control coil's one end is used for connecting a power supply, control coil's the other end is connected the input of switch tube, the output ground connection of switch tube, normally closed contact switch is arranged in establishing ties and sets up in the power supply line of vehicle consumer.
Furthermore, the relay further comprises a normally open contact switch, the input end of the switch tube is grounded through a self-locking circuit, and the normally open contact switch is arranged in the self-locking circuit in series.
Further, a voltage stabilizing tube, a current limiting resistor and a filter capacitor are sequentially arranged between the output end of the second comparator and the control end of the switch tube.
Further, the control coil is reversely connected with a diode in parallel.
The utility model provides a pair of vehicle consumer overflows technical effect that detects protection device includes: the voltage conversion unit can convert the collected current signals of the vehicle electric equipment into corresponding voltage signals, and further overcurrent detection protection can be performed according to the voltage signals, so that the detection reliability is improved; the voltage signal output by the voltage conversion unit is output to a first input end of a first comparator, the comparison with the first comparison voltage is carried out, when the voltage signal output by the voltage conversion unit is larger than the first comparison voltage, the current ratio of the vehicle electric equipment is larger, the output end of the first comparator outputs a high level signal, the output end of the first comparator is connected with a charging end of a charging circuit, the charging circuit is charged, the voltage of the charging circuit is charged from 0 to be larger than the second comparison voltage, and a certain time is consumed.
Drawings
Fig. 1 is an overall configuration diagram of an overcurrent detection protection device for a vehicular electric apparatus;
fig. 2 is a circuit diagram of a voltage conversion unit;
FIG. 3 is a circuit diagram of a comparator unit;
fig. 4 is a circuit diagram of a power down protection unit.
Detailed Description
The embodiment provides an overcurrent detection protection device for vehicle electrical equipment, which comprises a voltage conversion unit, a comparator unit and a power-off protection unit, as shown in fig. 1.
The voltage conversion unit is used for converting the collected current signals of the vehicle electric equipment into corresponding voltage signals.
The comparator unit includes a first comparator, a second comparator, and a charging circuit. The first comparator and the second comparator can be both single comparator devices, and can also form a dual comparator chip. The charging circuit is used for realizing a charging function, such as a capacitor, or a capacitor circuit formed by connecting at least two capacitors in parallel.
The output end of the voltage conversion unit is connected with the first input end of the first comparator, the second input end of the first comparator is used for inputting a first comparison voltage, when the voltage of the first input end is higher than the first comparison voltage, the output end of the first comparator outputs a high level signal, and when the voltage of the first input end is lower than the first comparison voltage, the output end of the first comparator outputs a low level signal. The output end of the first comparator is connected with the charging end of the charging circuit, the charging end of the charging circuit is connected with the third input end of the second comparator, the fourth input end of the second comparator is used for inputting second comparison voltage, when the voltage of the third input end is higher than the second comparison voltage, the output end of the second comparator outputs a high level signal, and when the voltage of the third input end is lower than the second comparison voltage, the output end of the second comparator outputs a low level signal.
The output end of the second comparator is connected with the input end of the power-off protection unit. The power-off protection unit is used for controlling whether the vehicle electric equipment is powered off or not according to the voltage output by the output end of the second comparator.
For example, if the vehicle electrical equipment is direct-current vehicle electrical equipment, the current signal is a direct-current signal; if the vehicle electric equipment is single-phase alternating current vehicle electric equipment, the current signal is a single-phase alternating current signal; if the vehicle electrical equipment is three-phase alternating current vehicle electrical equipment, the current signal is a three-phase alternating current signal. As a specific embodiment, if the vehicle electrical equipment is a three-phase ac vehicle electrical equipment, the current signals are three-phase ac current signals, and the a-phase ac current signal IA and the B-phase ac current signal IB are collected, where IA is collected by the a-phase current transformer and IB is collected by the B-phase current transformer.
The voltage converting unit has a conventional circuit structure, and fig. 2 is a specific circuit diagram of the voltage converting unit. As shown in fig. 2, IA flows to the negative terminal through the resistor R3, and a voltage signal is generated across the resistor R3, and the voltage signal is rectified by the diode D3, filtered by the filter circuit formed by the resistor R2 and the capacitor C1, and then output through the diode D4. IB flows to the negative electrode through the resistor R5, a voltage signal is generated across the resistor R5, and the voltage signal is rectified by the diode D1, filtered by the filter circuit formed by the resistor R4 and the capacitor C2, and then output through the diode D2. The other end of the diode D4 is connected with the other end of the diode D2, so that the voltage signal rectified and filtered by the A-phase current transformer and the voltage signal rectified and filtered by the B-phase current transformer are connected in parallel, and a voltage signal U1.3 is output through a resistor R11. The voltage signal U1.3 is used for output to the comparator unit.
In this embodiment, the first comparator and the second comparator constitute a dual comparator chip U1. As shown IN fig. 3, the first input terminal of the first comparator is pin 3 (i.e., pin 1IN +) of the dual comparator chip U1, the second input terminal of the first comparator is pin 2 (i.e., pin 1 IN-) of the dual comparator chip U1, and the output terminal of the first comparator is pin 1 (i.e., pin 1 OUT) of the dual comparator chip U1. The third input terminal of the second comparator is pin 5 (i.e., pin 2IN +) of the dual comparator chip U1, the fourth input terminal of the second comparator is pin 6 (i.e., pin 2 IN-) of the dual comparator chip U1, and the output terminal of the second comparator is pin 7 (i.e., pin 2 OUT) of the dual comparator chip U1. Pin 4 and pin 8 of the dual comparator chip U1 are power terminals for connection to +15V and ground, respectively.
In this embodiment, the comparator unit further includes a first comparison voltage output circuit, the first comparison voltage output circuit includes a first voltage division branch, one end of the first voltage division branch is used for connecting a power supply (in this embodiment, the power supply is + 15V), the other end of the first voltage division branch is grounded, as shown in fig. 3, a first potentiometer RP1 is serially connected to the first voltage division branch, and a voltage regulation end of the first potentiometer RP1 is connected to the pin 2 of the dual comparator chip U1 and is used for outputting a first comparison voltage. Then, by adjusting the first potentiometer RP1, the magnitude of the first comparison voltage can be adjusted. In addition, in this embodiment, a voltage dividing resistor R10 is further connected in series to the first voltage dividing branch. Therefore, the first potentiometer RP1 is connected in series with the voltage dividing resistor R10 to divide the voltage of +15V, and the first comparison voltage is adjusted by adjusting the first potentiometer RP 1.
The comparator unit further includes a second comparison voltage output circuit, the second comparison voltage output circuit includes a second voltage-dividing branch, one end of the second voltage-dividing branch is used for connecting a power supply (the power supply here may also be + 15V), the other end of the second voltage-dividing branch is grounded, as shown in fig. 3, a second potentiometer RP2 is serially arranged on the second voltage-dividing branch, and a voltage regulation end of the second potentiometer RP2 is connected to the pin 6 of the dual comparator chip U1, and is used for outputting a second comparison voltage. Then, by adjusting the second potentiometer RP2, the magnitude of the second comparison voltage can be adjusted. In addition, in this embodiment, a voltage dividing resistor R8 is further connected in series to the second voltage dividing branch. Therefore, the second potentiometer RP2 is connected in series with the voltage dividing resistor R8 to divide the voltage of +15V, and the second comparison voltage is adjusted by adjusting the second potentiometer RP 2.
In this embodiment, the charging circuit includes a capacitor branch, and the capacitor branch includes a capacitor or at least two capacitors connected in parallel, and in this embodiment, the capacitor branch includes a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, and a capacitor C12, and a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, and a capacitor C12 are connected in parallel. One end of the capacitor branch is grounded, and the other end of the capacitor branch is a charging end of the charging circuit. Further, in order to realize the current limiting function, the charging circuit further comprises a current limiting resistor R7, the other end of the capacitor branch is connected with one end of the current limiting resistor R7 and the pin 5 of the dual comparator chip U1, and the other end of the current limiting resistor R7 is connected with the pin 1 of the dual comparator chip U1.
As a specific embodiment, the power-off protection unit includes a switch tube Q1 and a relay, the switch tube Q1 is exemplified by a triode, and the relay includes a control coil K1 and a normally closed contact switch S1. As shown in fig. 4, the control end of the switch tube Q1 is the input end of the power-off protection unit, further, in order to improve signal stability, a voltage regulator tube D5, a current-limiting resistor R9 and a filter capacitor C4 are sequentially disposed between the pin 7 of the dual comparator chip U1 and the control end of the switch tube Q1, and a voltage signal U1.7 output by the pin 7 of the dual comparator chip U1 is sequentially subjected to voltage stabilization by the voltage regulator tube D5, current limitation by the current-limiting resistor R9 and filtering by the filter capacitor C4, and then output to the control end of the switch tube Q1. One end of the control coil K1 is used to connect a power supply (the power supply may be +15V or +24V as mentioned above), the other end of the control coil K1 is connected to the input end of the switch tube Q1, and the output end of the switch tube Q1 is grounded. Further, the control coil K1 is connected in parallel with a diode D6 in the reverse direction, and the current leakage rate in the control coil K1 is increased through the diode D6. It should be understood that in the normally closed contact switch S1, terminals 2 and 4 are connected in an on state, and terminals 2 and 5 are connected in an off state. The normally closed contact switch S1 is provided in series in the power supply line of the vehicular electric device, that is, the 2-terminal and the 4-terminal are provided in series in the power supply line of the vehicular electric device.
In order to realize self-locking after the normally closed contact switch S1 of the relay is opened so as to realize continuous opening, the relay also comprises a normally open contact switch S2, the input end of a switch tube Q1 is grounded through a self-locking circuit, and a normally open contact switch S2 is arranged in series in the self-locking circuit. It should be understood that in the normally open contact switch S2, terminals 6 and 1 are connected in the on state, and terminals 6 and 8 are connected in the off state. Then, when the control coil K1 is powered on, the normally open contact switch S2 is turned on, so that the control coil K1 is continuously powered on, the self-locking function is completed, the control coil K1 is continuously in a powered state, and the vehicle can normally work only after being powered on again.
The voltage signal U1.3 is output to a pin 3 of the dual comparator chip U1 and is compared with a first comparison voltage, when the voltage signal U1.3 is greater than the first comparison voltage, the pin 1 of the dual comparator chip U1 outputs a high level, a capacitor branch consisting of a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12 is charged after current limiting through a current limiting resistor R7, the voltage of the capacitor branch gradually rises, and when the voltage of the capacitor branch rises to be greater than a second comparison voltage, the pin 7 of the dual comparator chip U1 outputs a high level. Therefore, charging delay is realized through the charging process of the capacitor branch circuit, and false triggering protection is avoided.
When the pin 7 of the dual comparator chip U1 outputs a high level, the high level signal passes through the voltage regulator tube D5, the current limiting resistor R9 and the filter capacitor C4, and then drives the switch tube Q1 to be turned on. The normally closed contact switch S1 is switched off to cut off the power supply of the vehicle electrical equipment to complete the overcurrent protection function, and the normally open contact switch S2 is switched on to complete the self-locking function to ensure that the control coil K1 is continuously electrified.
Moreover, the first comparison voltage output circuit and the second comparison voltage output circuit can adjust the first comparison voltage and the second comparison voltage, and further the overcurrent protection value and the charging delay time can also be changed correspondingly, so different comparison voltages are applicable to different judgment logics, namely, the first comparison voltage output circuit and the second comparison voltage output circuit are arranged, the vehicle electric equipment overcurrent detection protection device can be used for different vehicle electric equipment, the universality is high, and the probability of error protection is reduced through the optimization of the circuits.
Claims (8)
1. The utility model provides a vehicle consumer overcurrent detection protection device which characterized in that includes: the voltage conversion unit is used for converting the collected current signals of the vehicle electric equipment into corresponding voltage signals; the comparator unit comprises a first comparator, a second comparator and a charging circuit, wherein the output end of the voltage conversion unit is connected with the first input end of the first comparator, the second input end of the first comparator is used for inputting a first comparison voltage, the output end of the first comparator is connected with the charging end of the charging circuit, the charging end of the charging circuit is connected with the third input end of the second comparator, and the fourth input end of the second comparator is used for inputting a second comparison voltage; and the power-off protection unit is used for controlling whether the vehicle electric equipment is powered off or not according to the voltage output by the output end of the second comparator, and the output end of the second comparator is connected with the input end of the power-off protection unit.
2. The over-current detection protection device for vehicle electric equipment according to claim 1, wherein the comparator unit further comprises a first comparison voltage output circuit, the first comparison voltage output circuit comprises a first voltage division branch, one end of the first voltage division branch is used for connecting a power supply, the other end of the first voltage division branch is grounded, a first potentiometer is serially connected to the first voltage division branch, and a voltage regulation end of the first potentiometer is connected to a second input end of the first comparator and is used for outputting the first comparison voltage.
3. The over-current detection protection device for vehicle electric equipment according to claim 1, wherein the comparator unit further comprises a second comparison voltage output circuit, the second comparison voltage output circuit comprises a second voltage division branch, one end of the second voltage division branch is used for connecting a power supply, the other end of the second voltage division branch is grounded, a second potentiometer is serially connected to the second voltage division branch, and a voltage regulation end of the second potentiometer is connected to a fourth input end of the second comparator and is used for outputting the second comparison voltage.
4. The vehicular electric equipment overcurrent detection protection device according to claim 1, wherein the charging circuit comprises a capacitor branch, the capacitor branch comprises one capacitor or at least two capacitors arranged in parallel, one end of the capacitor branch is grounded, and the other end of the capacitor branch is a charging end of the charging circuit.
5. The over-current detection protection device for the vehicular electric equipment according to claim 1, wherein the power-off protection unit comprises a switch tube and a relay, the relay comprises a control coil and a normally closed contact switch, a control end of the switch tube is an input end of the power-off protection unit, one end of the control coil is used for being connected with a power supply source, the other end of the control coil is connected with an input end of the switch tube, an output end of the switch tube is grounded, and the normally closed contact switch is used for being arranged in a power supply line of the vehicular electric equipment in series.
6. The over-current detection protection device for the vehicular electric equipment according to claim 5, wherein the relay further comprises a normally open contact switch, the input end of the switch tube is grounded through a latching circuit, and the normally open contact switch is serially arranged in the latching circuit.
7. The over-current detection protection device for the vehicle electric equipment according to claim 5, wherein a voltage regulator tube, a current limiting resistor and a filter capacitor are sequentially arranged between the output end of the second comparator and the control end of the switch tube.
8. The vehicular electric equipment overcurrent detection protection device according to claim 5, wherein the control coil is connected in parallel with a diode in a reverse direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023230460.3U CN214069550U (en) | 2020-12-29 | 2020-12-29 | Overcurrent detection protection device for vehicle electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023230460.3U CN214069550U (en) | 2020-12-29 | 2020-12-29 | Overcurrent detection protection device for vehicle electrical equipment |
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| CN214069550U true CN214069550U (en) | 2021-08-27 |
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| CN202023230460.3U Active CN214069550U (en) | 2020-12-29 | 2020-12-29 | Overcurrent detection protection device for vehicle electrical equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002489A (en) * | 2021-10-29 | 2022-02-01 | 公牛集团股份有限公司 | Overcurrent detection circuit and overcurrent detection system for alternating current |
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2020
- 2020-12-29 CN CN202023230460.3U patent/CN214069550U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002489A (en) * | 2021-10-29 | 2022-02-01 | 公牛集团股份有限公司 | Overcurrent detection circuit and overcurrent detection system for alternating current |
| CN114002489B (en) * | 2021-10-29 | 2024-07-23 | 公牛集团股份有限公司 | Overcurrent detection circuit and overcurrent detection system for alternating current |
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