CN216526181U - Relay adhesion detection module - Google Patents
Relay adhesion detection module Download PDFInfo
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- CN216526181U CN216526181U CN202122784693.6U CN202122784693U CN216526181U CN 216526181 U CN216526181 U CN 216526181U CN 202122784693 U CN202122784693 U CN 202122784693U CN 216526181 U CN216526181 U CN 216526181U
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- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical group O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims abstract description 92
- 238000005070 sampling Methods 0.000 claims abstract description 68
- 239000003990 capacitor Substances 0.000 claims description 7
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 2
- 238000013480 data collection Methods 0.000 description 1
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Abstract
The utility model discloses a relay adhesion detection module which comprises a DCDC unit, an adhesion detection circuit and a data acquisition unit, wherein the DCDC unit comprises a DCDC interface, a DCDC interface and a data acquisition unit; the first output end of the DCDC unit is connected with the first end of the relay to be tested through the adhesion detection circuit, the second output end of the DCDC unit is connected with the second end of the relay to be tested, and the DCDC unit is used for providing power supply voltage for the adhesion detection circuit; a switch is configured in a power supply circuit of the DCDC unit and used for switching on or switching off the power supply circuit of the DCDC unit according to a key switch signal; the DCDC unit is also used for supplying power for the data acquisition unit, and the data acquisition unit is connected with the sampling end of the adhesion detection circuit. The relay adhesion detection module provided by the utility model does not need to carry out active control and step-down of detection signals in the working process, the working mode is simple, the relay adhesion detection module realizes starting or stopping work according to the switching signals, and the relay adhesion detection module only starts to work when needed, so that the overall power consumption is low.
Description
Technical Field
The embodiment of the utility model relates to a relay detection technology, in particular to a relay adhesion detection module.
Background
A main positive relay, a main negative relay, a pre-charge relay, and the like are generally disposed in a battery system disposed in an electric vehicle, wherein the pre-charge relay is connected in parallel with the main positive relay, the main positive relay is disposed in a positive line of a battery charge and discharge circuit, the main negative relay is disposed in a negative line of the battery charge and discharge circuit, and the relays are used for turning on or off the battery charge and discharge circuit according to a control command. In order to ensure the normal charge and discharge function of the battery system, the relay is generally required to be subjected to adhesion detection, so that the relay can be normally closed or opened according to a control instruction.
Among the prior art, the voltage at main relay both ends is usually directly detected, and the voltage through main relay both ends judges whether main relay has the adhesion trouble, because the circuit that main relay is located is high tension line, therefore this kind of scheme has following defect: the high-voltage detection circuit is complex in structure and high in power consumption.
SUMMERY OF THE UTILITY MODEL
The utility model provides a relay adhesion detection module, which aims to simplify the structure of a relay adhesion detection circuit and reduce the power consumption of the relay adhesion detection circuit.
The embodiment of the utility model provides a relay adhesion detection module, which comprises a DCDC unit, an adhesion detection circuit and a data acquisition unit;
the first output end of the DCDC unit is connected with the first end of the relay to be tested through the adhesion detection circuit, the second output end of the DCDC unit is connected with the second end of the relay to be tested, and the DCDC unit is used for providing power supply voltage for the adhesion detection circuit;
a switch is configured in a power supply circuit of the DCDC unit, and the switch is used for switching on or off the power supply circuit of the DCDC unit according to a switching signal;
the DCDC unit is also used for supplying power to the data acquisition unit, and the data acquisition unit is connected with the sampling end of the adhesion detection circuit.
Optionally, a first DCDC unit is further configured in the power supply circuit of the DCDC unit;
the output end of the first DCDC unit is connected with the input end of the DCDC unit, and the switch is used for switching on or switching off the power supply of the first DCDC unit according to the switching signal.
Optionally, the adhesion detection circuit includes a first voltage dividing unit and a second voltage dividing unit;
the first voltage division unit is connected with the second voltage division unit in series, and a first output end of the DCDC unit is connected with a first end of the relay to be tested through the first voltage division unit and the second voltage division unit;
and the connection point of the first voltage division unit and the second voltage division unit is used as the sampling end.
Optionally, the first voltage dividing unit includes a first resistor, and the second voltage dividing unit includes a diode;
the first output end of the DCDC unit is connected with the anode of the diode through the first resistor, and the cathode of the diode is connected with the first end of the relay to be tested.
Optionally, the first voltage dividing unit includes at least one voltage dividing resistor, and the second voltage dividing unit includes at least one voltage dividing resistor;
the divider resistors are connected in series.
Optionally, the device further comprises a second resistor and a capacitor;
the sampling end is connected with the data acquisition unit through the second resistor, and two ends of the capacitor are respectively connected with the data acquisition unit and the ground.
Optionally, a clamping diode is further included;
and the cathode and the anode of the clamping diode are respectively connected with the data acquisition unit and the ground.
Optionally, the device further comprises a two-way series switch diode;
and the negative electrode, the positive electrode and the common end of the two-way series switch diode are respectively connected with the first output end of the DCDC unit, the ground and the data acquisition unit.
Optionally, the DCDC unit is configured to output 5V power.
Optionally, the first DCDC unit is configured to output 12V power.
Compared with the prior art, the utility model has the beneficial effects that: the relay adhesion detection module provided by the utility model is provided with a DCDC unit, an adhesion detection circuit and a data acquisition unit, wherein the DCDC unit is used for providing a low-voltage working power supply required by the adhesion detection circuit and the data acquisition unit, when the relay adhesion detection is carried out, the data acquisition unit does not directly acquire the voltage at two ends of a cathode relay, the data acquisition unit acquires a low-voltage detection signal which is injected by the DCDC unit and passes through the adhesion detection circuit, the whole detection process does not need to carry out active control or step-down of the detection signal, correspondingly, the adhesion detection circuit does not contain a controlled device and a voltage conversion device, in addition, the DCDC unit realizes the start or stop work according to a switching signal, the control mode of the DCDC unit is simple, and the structures of the adhesion monitoring circuit and the DCDC unit control circuit are integrated, the relay adhesion detection module provided by the utility model has a simple structure, the power consumption is low.
Drawings
FIG. 1 is a schematic structural diagram of a relay adhesion detection module in an embodiment;
FIG. 2 is a schematic diagram of a DCDC unit power supply circuit in an embodiment;
FIG. 3 is a schematic diagram of an adhesion detection circuit according to an embodiment;
FIG. 4 is a schematic diagram of another adhesion detection circuit in an embodiment;
FIG. 5 is a schematic structural diagram of another relay sticking detection module in the embodiment;
FIG. 6 is a schematic structural diagram of another relay sticking detection module in the embodiment;
FIG. 7 is a schematic diagram of another relay sticking detection module in the embodiment.
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 utility model and are not limiting of the utility model. 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.
Example one
The present embodiment provides a relay adhesion detection module, fig. 1 is a schematic structural diagram of the relay adhesion detection module in the embodiment, and referring to fig. 1, the relay adhesion detection module includes a DCDC unit 100, an adhesion detection circuit 200, and a data acquisition unit 300.
A first output end Vout + of the DCDC unit 100 is connected with a first end of the cathode relay 2 through the adhesion detection circuit 200, and a second output end Vout-of the DCDC unit 100 is connected with a second end of the cathode relay 2; the sampling end of the adhesion detection circuit 200 is connected to the data acquisition unit 300.
The switch K1 is configured in the power supply circuit of the DCDC unit 100, and the switch K1 is configured to turn on or off the power supply circuit of the DCDC unit 100 according to the switching signal Key _ on.
For example, in this embodiment, the switch signal Key _ on may be a manual input signal or a control signal output by the controller according to a preset program.
In the present embodiment, the DCDC unit 100 is used to provide a power voltage to the adhesion detection circuit 200 and to provide power to the data acquisition unit 300.
For example, in this embodiment, the adhesion detection circuit 200 may be used to implement voltage sampling or current sampling, and taking the example that the adhesion detection circuit 200 is configured as a voltage sampling, the usage and operation manner of the relay adhesion detection module are as follows:
And 2, the data acquisition unit 300 judges whether the cathode relay 2 is adhered according to the sampling voltage output by the adhesion detection circuit 200.
For example, in this step, the data acquisition unit 300 may determine whether the negative relay is stuck according to the following strategy:
the data acquisition unit 300 is powered on and started, and acquires sampling voltage output by the adhesion detection circuit 200 after a set time;
in a set sampling period, judging whether the sampling voltage is continuously greater than a first threshold (for example, 3.5V), and if the sampling voltage is continuously greater than the first threshold, judging that the negative relay 2 is normally disconnected;
in a set sampling period, judging whether the sampling voltage is continuously in a second threshold range (for example, 1.5V-3.0), and if the sampling voltage is continuously in the second threshold range, judging that the negative relay 2 is adhered;
in a set sampling period, it is determined whether the sampling voltage is continuously less than a third threshold (e.g., 1.0V), and if the sampling voltage is continuously less than the third threshold, it is determined that the adhesion detection circuit 200 is abnormal.
The relay adhesion detection module that this embodiment provided disposes the DCDC unit, adhesion detection circuitry and data acquisition unit, wherein, the DCDC unit is used for providing adhesion detection circuitry and the required low pressure working power supply of data acquisition unit, carry out relay adhesion and detect time measuring, the voltage at negative pole relay both ends is not directly gathered to the data acquisition unit, the data acquisition unit gathers the low pressure detected signal that the DCDC unit pours into and passes through behind the adhesion detection circuitry, whole testing process need not to carry out the step-down that active control also need not to carry out detected signal, it is corresponding, do not contain controlled device and voltage conversion device in the adhesion detection circuitry.
In addition, the DCDC unit realizes starting or stop work according to switching signal, and the control mode of DCDC unit is simple, synthesizes adhesion monitoring circuit and DCDC unit control circuit's structure, and the relay adhesion detection module that this embodiment provided's simple structure, the low power dissipation.
For example, in one possible embodiment, the switch signal Key _ on may be a Key switch signal, the Key switch signal Key _ on being a signal that specifically represents the state of the vehicle ignition switch.
With reference to fig. 1, when the Key switch signal Key _ on represents a signal indicating a state of an ignition switch of a vehicle, the relay adhesion detection module is suitable for a scenario of performing adhesion detection on a negative relay in a charge-discharge loop of a vehicle-mounted battery.
In this embodiment, the switch K1 turns ON the power supply circuit of the DCDC unit 100 when the ignition switch is turned to the ON position, and the switch K1 turns OFF the power supply circuit of the DCDC unit 100 when the ignition switch is turned to the OFF position.
In this embodiment, the power supply of the DCDC unit 100 may be derived from an on-board battery or a bms (battery Management system) module.
For example, in this scheme, the adhesion detection circuit 200 may be configured to implement voltage sampling or current sampling, and taking configuring the adhesion detection circuit 200 as the voltage sampling as an example, the usage and operation mode of the relay adhesion detection module are as follows:
And 2, the data acquisition unit 300 judges whether the cathode relay 2 is adhered according to the sampling voltage output by the adhesion detection circuit 200.
For example, in this step, the data acquisition unit 300 may determine whether the negative relay is stuck according to the following strategy:
the data acquisition unit 300 is powered on and started, and acquires sampling voltage output by the adhesion detection circuit 200 after a set time;
in a set sampling period, judging whether the sampling voltage is continuously greater than a first threshold (for example, 3.5V), and if the sampling voltage is continuously greater than the first threshold, judging that the negative relay 2 is normally disconnected;
in a set sampling period, judging whether the sampling voltage is continuously in a second threshold range (for example, 1.5V-3.0), and if the sampling voltage is continuously in the second threshold range, judging that the negative relay 2 is adhered;
in a set sampling period, it is determined whether the sampling voltage is continuously less than a third threshold (e.g., 1.0V), and if the sampling voltage is continuously less than the third threshold, it is determined that the adhesion detection circuit 200 is abnormal.
Fig. 2 is a schematic structural diagram of a DCDC unit power supply circuit in an embodiment, and referring to fig. 2, as an implementation, in this embodiment, a first DCDC unit 3 may be further configured in the power supply circuit of the DCDC unit 100.
The output terminal of the first DCDC unit 3 is connected to the input terminal of the DCDC unit 100, and the switch K1 is configured to turn on or off the power supply of the first DCDC unit 3 according to the Key switch signal Key _ on.
For example, in the scheme shown in fig. 2, the first DCDC unit 3 is a DCDC converter configured in the BMS, the Key switch signal Key _ on is configured as a wake-up signal of the BMS, and when the BMS wakes up, the first DCDC unit 3 starts to operate, so that the DCDC unit 100 starts to operate.
In this embodiment, the first DCDC unit 3 is used to convert the voltage output from the battery pack to an operating voltage (e.g., 12V) required by the BMS, and the DCDC unit 100 is used to further reduce the voltage output from the first DCDC unit 3 to an operating voltage (e.g., 5V) required by the sticking detection circuit 200 and the data collection unit 300.
In this scheme, key switch signal configuration is for the awakening signal of BMS, and when BMS awakens up, first DCDC unit and DCDC unit start-up work, and then the adhesion detection function of relay is realized to relay adhesion detection module in the time, because BMS when not awakening up, does not carry out the adhesion detection of relay, consequently, when BMS is not awaken up, relay adhesion detection module does not have the consumption, can reduce the energy loss of battery to a certain extent.
Example two
On the basis of the relay adhesion detection module described in the first embodiment, in this embodiment, an adhesion detection circuit is configured for voltage sampling.
In this embodiment, the configured adhesion detection circuit includes a first voltage dividing unit and a second voltage dividing unit, and the first voltage dividing unit and the second voltage dividing unit are configured to be connected in series;
and a connection point of the first voltage division unit and the second voltage division unit is configured as a sampling end connected with the data acquisition unit.
Fig. 3 is a schematic structural diagram of a sticking detection circuit in an embodiment, and referring to fig. 3, as an implementation, a first voltage dividing unit in the sticking detection circuit includes a first resistor R1, and a second voltage dividing unit in the sticking detection circuit includes a diode D1.
A first output end Vout + of the DCDC unit is connected with the anode of a diode D1 through a first resistor R1, and the cathode of a diode D1 is connected with a first end of a cathode relay;
the connection point of the first resistor R1 and the diode D1 serves as a sampling terminal of the adhesion detection circuit and is connected to the data sampling unit 300.
Exemplarily, taking the DCDC unit outputting 5V electricity as an example, in this scheme, the working mode of the relay adhesion detection module is as follows:
And 2, judging whether the negative relay is adhered or not by the data acquisition unit according to the sampling voltage output by the sampling end of the adhesion detection circuit.
In the scheme, the data acquisition unit is powered on and started, and the sampling voltage output by the adhesion detection circuit is acquired after a set time (for example, 200ms) elapses;
and judging whether the sampling voltage is continuously in the range of 0V-0.5V or not within a set sampling period (for example, 200ms), and if the sampling voltage is continuously in the range, judging that the negative relay is adhered.
For example, in the present solution, it may be determined whether the sampling battery is continuously within the set range as follows:
if the total number of the sampling voltages in the set range is larger than the set value in the sampling period, the sampling battery is considered to be continuously in the set range;
for example, 10 sampling voltages are acquired in the sampling period, wherein 8 sampling voltages are within the set range, and the sampling voltages are considered to be continuously within the set range.
Whether the sampling battery is continuously in the set range can be judged as follows:
if the sampling voltage is within the set range in the sampling period and the difference value between any two sampling voltages is within the set error range (for example, -20mV to 20mV), the sampling voltage is considered to be continuously within the set range.
As a possible implementation, the first voltage dividing unit in the adhesion detection circuit may include at least one voltage dividing resistor, and the second voltage dividing unit includes at least one voltage dividing resistor.
Fig. 4 is a schematic structural diagram of another adhesion detection circuit in an embodiment, and referring to fig. 4, when a plurality of voltage division resistors are configured in the adhesion detection circuit, the first voltage division unit may include a resistor R2 and a resistor R3, and the second voltage division unit may include a resistor R4, a resistor R5, and a resistor R6;
the resistors R2-R6 are connected in series, a first output end Vout + of the DCDC unit is connected with one end of the resistor R2, and one end of the resistor R6 is connected with the first end of the cathode relay;
the connection point of the resistor R3 and the resistor R4 serves as a sampling terminal of the adhesion detection circuit and is connected to the data sampling unit 300.
Exemplarily, taking the DCDC unit outputting 5V electricity as an example, in this scheme, the working mode of the relay adhesion detection module is as follows:
And 2, judging whether the negative relay is adhered or not by the data acquisition unit according to the sampling voltage output by the sampling end of the adhesion detection circuit.
In the scheme, the data acquisition unit is powered on and started, and the sampling voltage output by the adhesion detection circuit is acquired after a set time (for example, 200ms) elapses;
and judging whether the sampling voltage is continuously in the range of 1.7V-2.5V within a set sampling period (for example, 200ms), and if the sampling voltage is continuously in the range, judging that the negative relay is adhered.
Fig. 5 is a schematic structural diagram of another relay adhesion detection module in the embodiment, and referring to fig. 5, based on the scheme shown in fig. 1, the relay adhesion detection module further includes a second resistor R20 and a capacitor C1;
the sampling end of the adhesion detection circuit 200 is connected with the data acquisition unit 300 through a second resistor R20, and two ends of the capacitor C1 are respectively connected with the data acquisition unit 300 and the ground.
For example, in the scheme shown in fig. 5, the resistor R20 and the capacitor C1 are used for current limiting and filtering of the sampled signal.
Fig. 6 is a schematic structural diagram of another relay adhesion detection module in the embodiment, and referring to fig. 6, on the basis of the scheme shown in fig. 5, the relay adhesion detection module further includes a clamping diode D10;
the cathode and the anode of the clamping diode D10 are respectively connected to the data acquisition unit 300 and the ground.
Illustratively, in the arrangement shown in fig. 6, a clamping diode D10 is used for clamping the sampled signal input into the data acquisition unit 300.
Fig. 7 is a schematic structural diagram of another relay sticking detection module in the embodiment, and referring to fig. 7, on the basis of the scheme shown in fig. 5, the relay sticking detection module further includes a two-way series switch diode D20;
the negative electrode, the positive electrode and the common end of the two-way series switch diode D20 are respectively connected with the first output end Vout +, the ground and the data acquisition unit 300 of the DCDC unit.
Illustratively, in the arrangement shown in FIG. 7, a two-way series-connected switching diode D20 is used to limit the voltage of the sampled signal input to the data acquisition unit 300 to between 0 and Vout +.
The beneficial effects of the relay adhesion detection module described in this embodiment are the same as those described in the first embodiment, and are not described herein again.
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 utility model. 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)
1. A relay adhesion detection module is characterized by comprising a DCDC unit, an adhesion detection circuit and a data acquisition unit;
the first output end of the DCDC unit is connected with the first end of the relay to be tested through the adhesion detection circuit, the second output end of the DCDC unit is connected with the second end of the relay to be tested, and the DCDC unit is used for providing power supply voltage for the adhesion detection circuit;
a switch is configured in a power supply circuit of the DCDC unit, and the switch is used for switching on or off the power supply circuit of the DCDC unit according to a switching signal;
the DCDC unit is also used for supplying power to the data acquisition unit, and the data acquisition unit is connected with the sampling end of the adhesion detection circuit.
2. The relay sticking detection module according to claim 1, wherein a first DCDC unit is further provided in a power supply circuit of the DCDC unit;
the output end of the first DCDC unit is connected with the input end of the DCDC unit, and the switch is used for switching on or switching off the power supply of the first DCDC unit according to the switching signal.
3. The relay sticking detection module according to claim 1, wherein the sticking detection circuit includes a first voltage dividing unit, a second voltage dividing unit;
the first voltage division unit is connected with the second voltage division unit in series, and a first output end of the DCDC unit is connected with a first end of the relay to be tested through the first voltage division unit and the second voltage division unit;
and the connection point of the first voltage division unit and the second voltage division unit is used as the sampling end.
4. The relay stick detection module of claim 3, wherein the first voltage division unit comprises a first resistor, and the second voltage division unit comprises a diode;
the first output end of the DCDC unit is connected with the anode of the diode through the first resistor, and the cathode of the diode is connected with the first end of the relay to be tested.
5. The relay sticking detection module according to claim 3, wherein the first voltage dividing unit includes at least one voltage dividing resistor, and the second voltage dividing unit includes at least one voltage dividing resistor;
the divider resistors are connected in series.
6. The relay stick detection module of claim 3, further comprising a second resistor, a capacitor;
the sampling end is connected with the data acquisition unit through the second resistor, and two ends of the capacitor are respectively connected with the data acquisition unit and the ground.
7. The relay stick detection module of claim 6, further comprising a clamping diode;
and the cathode and the anode of the clamping diode are respectively connected with the data acquisition unit and the ground.
8. The relay stick detection module of claim 6, further comprising a two-way series switch diode;
and the negative electrode, the positive electrode and the common end of the two-way series switch diode are respectively connected with the first output end of the DCDC unit, the ground and the data acquisition unit.
9. The relay stick detection module of claim 1, wherein the DCDC unit is configured to output 5V power.
10. The relay stick detection module of claim 2, wherein the first DCDC unit is configured to output 12V power.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122784693.6U CN216526181U (en) | 2021-11-12 | 2021-11-12 | Relay adhesion detection module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122784693.6U CN216526181U (en) | 2021-11-12 | 2021-11-12 | Relay adhesion detection module |
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| CN216526181U true CN216526181U (en) | 2022-05-13 |
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