CN210894548U - Discharge overcurrent protection test circuit - Google Patents
Discharge overcurrent protection test circuit Download PDFInfo
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- CN210894548U CN210894548U CN201921733248.3U CN201921733248U CN210894548U CN 210894548 U CN210894548 U CN 210894548U CN 201921733248 U CN201921733248 U CN 201921733248U CN 210894548 U CN210894548 U CN 210894548U
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- current detection
- discharge
- overcurrent protection
- triode
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Abstract
The utility model discloses an overcurrent protection test circuit discharges, it includes current detection circuit, discharge MOS pipe MD1 and discharge MOS pipe drive circuit, current detection circuit is including examining flow chip U1 and examining flow resistance RN1, discharge overcurrent protection test circuit still is provided with the external power connection end that is used for connecting direct current regulated power supply, this external power connection end pass through resistance R5 with examine flow chip U1's the pin connection that flows. Utilize the utility model discloses, can reduce the current value that triggers discharge overcurrent protection action, usable current BMS test equipment carries out direct test to can effectively improve efficiency of software testing and production efficiency.
Description
Technical Field
The utility model relates to a test circuit, concretely relates to discharge overcurrent protection test circuit.
Background
General BMS (battery management system) test equipment only supports a discharge overcurrent protection value of 100A or less for cost reasons, while BMS discharge overcurrent protection values applied to higher powers such as electric motorcycles, electric tricycles and the like are generally greater than 100A or even greater than 200A. For the discharge overcurrent protection value larger than 100A, the existing processing mode is generally to paste a part of current detection resistors to adjust the discharge overcurrent value to be smaller than 100A, and paste other current detection resistors after the discharge overcurrent function is tested to be normal, so that the processing mode reduces the production efficiency and increases the production cost.
SUMMERY OF THE UTILITY MODEL
For overcoming the not enough problem that reaches the existence of prior art, the utility model provides a discharge overcurrent protection test circuit utilizes this discharge overcurrent protection test circuit, can effectively improve efficiency of software testing.
The utility model discloses a realize through following technical scheme: a discharge over-current protection test circuit comprises a current detection circuit, a discharge MOS tube MD1 and a discharge MOS tube drive circuit, the current detection circuit comprises a current detection chip U1 and a current detection resistor RN1, the grid electrode of a discharge MOS tube MD1 is connected with the current detection chip U1 through a discharge MOS tube driving circuit, the current detection resistor RN1 is connected in series between the source electrode of the discharge MOS tube MD1 and the negative output end of the battery pack, the drain electrode of the discharge MOS tube MD1 is connected with a test negative connection end, the positive output end of the battery pack is connected with a test positive connection end, the current detection pin of the current detection chip U1 is connected with the current detection resistor RN1 through a resistor R6, the discharge overcurrent protection test circuit is also provided with an external power supply connecting end for connecting a direct-current stabilized power supply, the external power supply connection end is connected with the current detection pin of the current detection chip U1 through a resistor R5.
Specifically, the positive electrode of the direct-current stabilized power supply is connected with the external power supply connecting end, and the negative electrode of the direct-current stabilized power supply is connected with the negative output end of the battery pack.
Preferably, the discharging MOS transistor driving circuit includes a first triode Q1 and a second triode Q2, a collector of the first triode Q1 is connected with a power supply terminal VCC1 through a resistor R1, and a collector of the first triode Q1 is connected with a gate of the discharging MOS transistor MD1, an emitter of the first triode Q1 is connected with a source of the discharging MOS transistor MD1, a base of the first triode Q1 is connected with a collector of the second triode Q2 through a resistor R2, an emitter of the second triode Q2 is connected with a power supply terminal VCC2, and a base of the second triode Q2 is connected with the current detection chip U1.
Compared with the prior art, the utility model provides a discharge overcurrent protection test circuit, it is through at the external constant voltage power supply of current detection circuit, can reduce the current value that triggers discharge overcurrent protection action, and usable current BMS test equipment carries out direct test to can effectively improve efficiency of software testing and production efficiency.
Drawings
Fig. 1 is the circuit structure schematic diagram of the discharge overcurrent protection test circuit of the present invention.
Detailed Description
To facilitate understanding of those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the discharge overcurrent protection test circuit comprises a current detection circuit, a discharge MOS tube MD1 and a discharge MOS tube drive circuit, the current detection circuit comprises a current detection chip U1 and a current detection resistor RN1, the grid electrode of a discharge MOS tube MD1 is connected with the current detection chip U1 through a discharge MOS tube driving circuit, the current detection resistor RN1 is connected between the source electrode of the discharge MOS tube MD1 and the negative output end P2 of the battery pack in series, the drain electrode of the discharge MOS tube MD1 is connected with a test negative connection end P4, the positive output end P1 of the battery pack is connected with a test positive connection end P3, the current detection pin of the current detection chip U1 is connected with the current detection resistor RN1 through a resistor R6, the discharge overcurrent protection test circuit is also provided with an external power supply connection end P5 for connecting a direct-current stabilized power supply, the external power supply connection P5 is connected to the current detection pin (pin 2) of the current detection chip U1 through a resistor R5. The positive electrode of the direct-current stabilized power supply is connected with an external power supply connection end P5, and the negative electrode of the direct-current stabilized power supply is connected with the negative output end P2 of the battery pack. In addition, the external power connection terminal is grounded through a first capacitor C1. In this embodiment, the voltage of the dc regulated power supply is 1.32V, and the resistance of the resistor R5 is 10K ohms; the chip model of the current detection chip U1 is preferably MM3280J 05; the type of the discharge MOS tube MD1 is preferably CRSS042N 10N.
In one preferred embodiment, the discharging MOS transistor driving circuit includes a first transistor Q1 and a second transistor Q2, a collector of the first transistor Q1 is connected to a power supply terminal VCC1 through a resistor R1, a collector of the first transistor Q1 is connected to a gate of the discharging MOS transistor MD1, an emitter of the first transistor Q1 is connected to a source of the discharging MOS transistor MD1, a base of the first transistor Q1 is connected to a collector of the second transistor Q2 through a resistor R2, an emitter of the second transistor Q2 is connected to a power supply terminal VCC2, and a base of the second transistor Q2 is connected to the current detecting chip U1 (specifically, to a pin 1 of the current detecting chip U1). In this embodiment, the voltage of the power supply terminal VCC1 is a reference voltage of 11V, and the voltage of the power supply terminal VCC2 may be provided by an external voltage source, or may be directly provided by one or more batteries in the battery pack. In this embodiment, the power supply terminal VCC2 is connected to the positive electrode of the first battery of the battery pack, i.e., the voltage is provided by one of the batteries in the battery pack.
The working principle or working process of the discharge overcurrent protection test circuit provided by the embodiment is briefly described as follows: assuming that the voltage at pin 2 of the current detecting chip U1 reaches 0.15V or more to trigger the discharging overcurrent protection, taking the resistance value of the current detecting resistor RN1 as 0.5 milliohm as an example, the discharging overcurrent protection value is 300A. The existing common BMS testing equipment cannot test the discharging overcurrent protection value larger than 100A, but the discharging overcurrent protection testing circuit provided by the embodiment is connected with the pin 2 of the current detection chip U1 through the addition of the external power connection terminal P5, the external power connection terminal P5 is connected with the pin 2 of the current detection chip U1 through the resistor R5 with the resistance value of 10K ohms, and the external power connection terminal P5 is connected with a 1.32V dc voltage-stabilized power supply during testing, so the pin 2 of the current detection chip U1 can obtain a 1.2V bias voltage, and the discharging overcurrent protection testing circuit can trigger the discharging overcurrent protection action only by the load current of 60A. Therefore, by using the discharging overcurrent protection test circuit provided by the embodiment, the discharging overcurrent protection value is reduced from the original value of 300A to 60A, so that the existing common BMS test equipment can be used for direct test, and the test efficiency and the production efficiency can be effectively improved.
The above embodiments are preferred implementations of the present invention, and are not intended to be limiting, and any obvious replacement is within the scope of the present invention without departing from the inventive concept of the present invention.
Claims (6)
1. The utility model provides a discharge overcurrent protection test circuit which characterized in that: the discharge overcurrent protection test circuit comprises a current detection circuit, a discharge MOS tube MD1 and a discharge MOS tube driving circuit, wherein the current detection circuit comprises a current detection chip U1 and a current detection resistor RN1, the grid of the discharge MOS tube MD1 is connected with the current detection chip U1 through the discharge MOS tube driving circuit, the source of the discharge MOS tube MD1 is connected with the negative output end of a battery pack in series, the current detection resistor RN1 is connected between the drain of the discharge MOS tube MD1 and a test negative connecting end, the positive output end of the battery pack is connected with a test positive connecting end, the current detection pin of the current detection chip U1 is connected with the current detection resistor RN1 through a resistor R6, the discharge overcurrent protection test circuit is further provided with an external power supply connecting end used for connecting a direct current stabilized power supply, and the external power supply connecting end is connected with the current detection pin of the current detection chip U1 through a resistor R5.
2. The discharge overcurrent protection test circuit of claim 1, wherein: the positive electrode of the direct-current stabilized power supply is connected with the external power supply connecting end, and the negative electrode of the direct-current stabilized power supply is connected with the negative output end of the battery pack.
3. The discharge overcurrent protection test circuit of claim 2, wherein: the external power connection is also connected to ground via a first capacitor C1.
4. The discharge overcurrent protection test circuit of claim 1, wherein: the MOS pipe drive circuit that discharges is including first triode Q1 and second triode Q2, first triode Q1's collecting electrode passes through resistance R1 and is connected with feed end VCC1, just first triode Q1's collecting electrode with the gate of MOS pipe MD1 that discharges is connected, first triode Q1's projecting pole with MOS pipe MD 1's source electrode connection discharges, first triode Q1's base pass through resistance R2 with the collecting electrode of second triode Q2 is connected, the projecting pole and the feed end VCC2 of second triode Q2 are connected, the base of second triode Q2 with detect the connection of current chip U1.
5. The discharge overcurrent protection test circuit according to any one of claims 1 to 4, wherein: the chip model of the current detection chip U1 is MM3280J 05.
6. The discharge overcurrent protection test circuit according to any one of claims 1 to 4, wherein: the model of the discharge MOS tube MD1 is CRSS042N 10N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921733248.3U CN210894548U (en) | 2019-10-15 | 2019-10-15 | Discharge overcurrent protection test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921733248.3U CN210894548U (en) | 2019-10-15 | 2019-10-15 | Discharge overcurrent protection test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210894548U true CN210894548U (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921733248.3U Active CN210894548U (en) | 2019-10-15 | 2019-10-15 | Discharge overcurrent protection test circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210894548U (en) |
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2019
- 2019-10-15 CN CN201921733248.3U patent/CN210894548U/en active Active
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| GR01 | Patent grant | ||
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| CP02 | Change in the address of a patent holder |
Address after: 523000 No. 49, Baoyuan Road, Lianhu, Tangxia Town, Dongguan City, Guangdong Province Patentee after: DONGGUAN JIABAIDA ELECTRONIC TECHNOLOGY CO.,LTD. Address before: 523000 second floor of building 6, No. 40, Baoyuan Second Road, Lianhu third industrial zone, Tangxia Town, Dongguan City, Guangdong Province Patentee before: DONGGUAN JIABAIDA ELECTRONIC TECHNOLOGY CO.,LTD. |