CN219811019U - Isolated interlocking detection circuit - Google Patents
Isolated interlocking detection circuit Download PDFInfo
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- CN219811019U CN219811019U CN202321252715.7U CN202321252715U CN219811019U CN 219811019 U CN219811019 U CN 219811019U CN 202321252715 U CN202321252715 U CN 202321252715U CN 219811019 U CN219811019 U CN 219811019U
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- power supply
- isolated
- circuit
- electrically connected
- detection circuit
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000002955 isolation Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004146 energy storage Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 4
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The utility model discloses an isolated interlocking detection circuit, which comprises: the power supply and detection circuit, the isolated DC-DC power supply, the protection circuit, the enabling circuit and the switch to be detected; the power supply and detection circuit is electrically connected with the isolated DC-DC power supply; the isolated DC-DC power supply is electrically connected with the protection circuit; the protection circuit is electrically connected with the enabling circuit; the enabling circuit is electrically connected with the switch to be tested. The utility model has the beneficial effects that: the interlocking circuits are mutually isolated, and isolation devices except an isolated DC-DC power supply and an enabling relay are not needed; meanwhile, the contact impedance of the electrified connector can be detected, and the state of poor interlocking contact can be effectively judged.
Description
Technical Field
The utility model relates to the field of distributed energy storage, in particular to an isolated interlocking detection circuit.
Background
The interlocking detection is widely applied in the field of battery energy storage and is mainly used for judging whether the connector or the switch is in good contact.
There are two main implementations of current interlock detection:
1. and in the non-isolation scheme, voltage is output at one end of the node, and the voltage at the other end is detected. The scheme can only be applied to the scene that the tested node is not electrified, and the electrified power wire harness cannot be directly detected; and the multiple interlocking detection circuits are not isolated, so that the detection results are wrong due to mutual interference.
2. And an isolation scheme is adopted, and secondary side current is detected. The scheme needs to isolate more complex peripheral circuits such as optocouplers and the like, can only judge whether contact exists or not, cannot judge whether contact is good or not and the contact resistance is large or not, and has limited application environment.
Disclosure of Invention
In order to solve the defects of limited application environment and complex peripheral circuits in the existing isolation type scheme and non-isolation type scheme, the utility model provides an isolation type interlocking detection circuit.
Specifically, the present utility model provides an isolated interlock detection circuit, comprising:
the power supply and detection circuit, the isolated DC-DC power supply, the protection circuit, the enabling circuit and the switch to be detected;
the power supply and detection circuit is electrically connected with the isolated DC-DC power supply;
the isolated DC-DC power supply is electrically connected with the protection circuit;
the protection circuit is electrically connected with the enabling circuit;
the enabling circuit is electrically connected with the switch to be tested.
Further, the power supply and detection circuit comprises a constant voltage power supply and two paths of acquisition units; the two-way acquisition unit comprises: and the voltage acquisition unit and the current acquisition unit.
Further, the isolated DC-DC power supply is provided with a feedback power supply or is not provided with a feedback power supply.
Further, the protection circuit includes: the current limiting resistor, the freewheeling diode and the reverse connection preventing diode;
wherein, two ends of the reverse connection preventing diode are electrically connected with the isolated DC-DC power supply;
the positive electrode of the freewheel diode is electrically connected with the negative electrode of the anti-reverse diode;
the cathode of the freewheel diode is electrically connected with one end of the current limiting resistor;
the other end of the current limiting resistor is electrically connected with the enabling circuit.
Further, the enabling circuit is used for preventing the energy storage system from leaking electricity through the interlocking detection circuit.
Further, the switch to be tested is an uncharged dry contact or an charged power wire harness.
Further, the calculation formula of the equivalent internal resistance R30 of the switch to be tested is as follows:
in the above formula, eta is the efficiency of the isolated DC-DC power supply; r1 is the resistance value of the current detection resistor; r2 is the resistance of the current limiting resistor; u1 is a voltage value acquired by a voltage acquisition unit; u2 is a voltage value obtained by converting the current acquired by the current acquisition unit.
The beneficial effects provided by the utility model are as follows: the interlocking circuits are mutually isolated, and isolation devices except an isolated DC-DC power supply and an enabling relay are not needed; meanwhile, the contact impedance of the electrified connector can be detected, and the state of poor interlocking contact can be effectively judged.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present utility model;
FIG. 2 is a schematic diagram of the utility model applied to the detection of the contact resistance of the main loop relay of the energy storage system;
fig. 3 is a schematic view showing the interlocking detection of a connector with a bayonet, to which the present utility model is applied.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be further described with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic circuit structure of the present utility model.
The utility model provides an isolated interlock detection circuit, comprising:
the power supply and detection circuit 10, the isolated DC-DC power supply 20, the protection circuit 30, the enabling circuit 40 and the switch 50 to be tested;
wherein the power supply and detection circuit 10 is electrically connected with the isolated DC-DC power supply 20; it should be noted that, the isolated DC-DC power supply 20 is unidirectional;
the isolated DC-DC power supply 20 is electrically connected with the protection circuit 30;
the protection circuit 30 is electrically connected with the enabling circuit 40;
the enabling circuit 40 is electrically connected to the switch 50 to be tested.
Referring to fig. 1, the power supply and detection circuit 10 includes a constant voltage power supply and two paths of acquisition units; the two-way acquisition unit comprises: and the voltage acquisition unit and the current acquisition unit. It should be noted that, the current collecting unit may be implemented by using a current divider or other units or modules capable of implementing the current collecting function, and in the present utility model, a voltage dividing resistor R1 is used. As an example, the power supply and detection circuit 10 employs a stable constant voltage source of +5v; u1 and U2 are output ends of the MCU isolated DC-DC power supply 20. The voltage acquisition unit obtains the sampling voltage U1, the current acquisition unit obtains the sampling current, and the input current of the isolated DC-DC power supply 20 is obtained after conversion.
The isolated DC-DC power supply 20 is either a power supply with feedback or a power supply without feedback. The isolated DC-DC power supply 20 is an integrated module, and the module may or may not have a feedback output, and the output voltage may be a known value, and the efficiency may be regarded as a constant, or may be obtained in advance by means of actual measurement, calibration, or the like.
The protection circuit 30 includes: the current limiting resistor, the freewheeling diode and the reverse connection preventing diode; the protection circuit 30 is mainly used to protect the isolated DC-DC power supply 20, so that the maximum power of the isolated DC-DC power supply 20 does not exceed the rated power. The flywheel diode and the anti-reflection diode are increased or decreased according to the actual situation.
Wherein both ends of the reverse connection preventing diode are electrically connected with the isolated DC-DC power supply 20;
the positive electrode of the freewheel diode is electrically connected with the negative electrode of the anti-reverse diode;
the cathode of the freewheel diode is electrically connected with one end of the current limiting resistor;
the other end of the current limiting resistor is electrically connected with the enabling circuit.
For one embodiment, please refer to fig. 1, in which the anti-reverse diode is a diode D1, the freewheeling diode is a diode D2, and the current limiting resistor is a resistor R2. Two ends of the diode D1 are electrically connected with the isolated DC-DC power supply 20;
the anode of the diode D2 is electrically connected with the cathode of the diode D1;
the cathode of the diode D2 is electrically connected with one end of the resistor R2;
the other end of the resistor R2 is electrically connected with the enabling circuit.
The enabling circuit 40 is used for preventing the switch 50 to be tested from leaking. Still referring to fig. 1, it should be noted that the enabling circuit 40 in fig. 1 is implemented using the switch K1, and in other embodiments, other anti-leakage modules or circuits may be implemented.
The switch 50 to be tested is an uncharged dry contact or an charged power harness.
The MCU voltage samples to obtain a voltage value U1, the MCU current samples to obtain a voltage value U2, the voltage drop of the anti-reflection diode is ignored, the actual calculation result can be obtained by calibration, and the voltage drop has no actual influence. Assuming that the efficiency of the isolated DC-DC power supply 20 is fixed to η, the maximum load of the isolated DC-DC power supply 20 is (U1-U2)/R2, no overload condition occurs, and the isolated DC-DC power supply 20 is 1:1, outputting a stable voltage U1 (the value is determined by the isolated DC-DC power supply 20, for convenience of calculation, assuming the stable voltage U1 is output), and obtaining through actual testing and table lookup, the equivalent resistance R30 of the load to be tested can obtain the following formula:
system power
Calculated to obtain
Internal resistance of switch to be measured
Wherein: r30 is the internal resistance of the node to be tested, U1/U2 is the voltage value acquired by the MCU, eta is related to the working state of the isolated DCDC, and is a fixed value (such as 0.95) and relatively stable in rated power. The method can obtain the above formula, and the state of the switch to be detected can be calculated by U1/U2 collected by the MCU.
Referring to fig. 2, fig. 2 is a schematic diagram of the present utility model applied to the detection of the contact resistance of the main loop relay of the energy storage system.
The rated voltage 500V of the energy storage system, K30 is a main positive contactor, K31 is a main negative relay, the BMS system has completed self-checking and begins to work, and the energy storage system discharges through an equivalent load RL.
In the interlocking circuit, the power supply module supplies power for +5V, the current sampling circuit R1=0.2R, the protection circuit current limiting resistor R2=10R, the enabling circuit works, and the DCDC isolated DC-DC power supply 20 selects Chuanjihua micro CA-IS3641.
During normal operation, the system operating current is 20mA, and when U2>20mV is detected, K30 contacts are normal and operate normally. When U2<18mV is detected, K30 contact resistance is larger and interlocking is abnormal. When U2<5mV is detected, K30 impedance is infinite, reporting an interlock failure.
As another embodiment, please refer to fig. 3, fig. 3 is a schematic diagram illustrating an interlock detecting method of a connector with bayonet according to the present utility model.
The male heads P1-P4 of a certain 4PIN connector correspond to the female heads P1 '-P4', and when the male heads and the female heads are in good contact, the P2/P3 resistor 50R; otherwise, the butt joint fails.
In the interlocking circuit, the power supply module supplies power for +5v, the current sampling circuit r1=0.2r, the protection circuit current limiting resistor r2=10r, the enabling circuit works, and the DCDC power supply module selects Jin Shengyang W0505 as the isolated DC-DC power supply 20.
During normal operation, the working current of the interlocking detection circuit is 65mA, and when U2 = 10 mV-15 mV, such as 13mV, the connectors are in good contact, so that P1 and P4 can be normally used; when U2>15mV is detected, a connector error; when 5mV < U2<10mV is detected, the connectors are misplaced or in poor contact, and an interlocking abnormality is reported; when U2<5mV is detected, the impedance of the connector is infinite, and the connector is judged not to be plugged.
The beneficial effects of the utility model are as follows: the interlocking circuits are isolated from each other, and isolation devices outside the isolated DC-DC power supply 20 and the enabling relay are not needed; meanwhile, the contact impedance of the electrified connector can be detected, and the state of poor interlocking contact can be effectively judged.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (6)
1. An isolated interlock detection circuit, characterized in that: comprising the following steps: the power supply and detection circuit (10), the isolated DC-DC power supply (20), the protection circuit (30), the enabling circuit (40) and the switch (50) to be detected;
wherein the power supply and detection circuit (10) is electrically connected with the isolated DC-DC power supply (20);
the isolated DC-DC power supply (20) is electrically connected with the protection circuit (30);
the protection circuit (30) is electrically connected with the enabling circuit (40);
the enabling circuit (40) is electrically connected with the switch (50) to be tested.
2. An isolated interlock detection circuit as defined in claim 1 wherein: the power supply and detection circuit (10) comprises a constant voltage power supply and two paths of acquisition units; the two-way acquisition unit comprises: and the voltage acquisition unit and the current acquisition unit.
3. An isolated interlock detection circuit as defined in claim 1 wherein: the isolated DC-DC power supply (20) is either a feedback power supply or no feedback power supply.
4. An isolated interlock detection circuit as defined in claim 2 wherein: the protection circuit includes: the current limiting resistor, the freewheeling diode and the reverse connection preventing diode;
wherein, two ends of the reverse connection preventing diode are electrically connected with the isolated DC-DC power supply (20);
the positive electrode of the freewheel diode is electrically connected with the negative electrode of the anti-reverse diode;
the cathode of the freewheel diode is electrically connected with one end of the current limiting resistor;
the other end of the current limiting resistor is electrically connected with the enabling circuit.
5. An isolated interlock detection circuit as defined in claim 1 wherein: the enabling circuit (40) is used for preventing leakage of the switch (50) to be tested.
6. An isolated interlock detection circuit as defined in claim 1 wherein: the switch (50) to be tested is an uncharged dry contact or an charged power harness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321252715.7U CN219811019U (en) | 2023-05-22 | 2023-05-22 | Isolated interlocking detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321252715.7U CN219811019U (en) | 2023-05-22 | 2023-05-22 | Isolated interlocking detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219811019U true CN219811019U (en) | 2023-10-10 |
Family
ID=88216706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321252715.7U Active CN219811019U (en) | 2023-05-22 | 2023-05-22 | Isolated interlocking detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219811019U (en) |
-
2023
- 2023-05-22 CN CN202321252715.7U patent/CN219811019U/en active Active
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