CN210090549U - Overcurrent detection circuit - Google Patents
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- CN210090549U CN210090549U CN201920278522.6U CN201920278522U CN210090549U CN 210090549 U CN210090549 U CN 210090549U CN 201920278522 U CN201920278522 U CN 201920278522U CN 210090549 U CN210090549 U CN 210090549U
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Abstract
The utility model relates to an overcurrent detection circuit, include: a first comparator, a second comparator, a first diode and a second diode; a first input end of the first comparator and a first input end of the second comparator both receive a test voltage signal, a second input end of the first comparator receives a first threshold voltage, and the first threshold voltage is a voltage corresponding to a discharge state overcurrent threshold; a second input end of the second comparator is connected with a second threshold voltage, and the second threshold voltage is a voltage corresponding to the charging state overcurrent threshold; the first end of the first diode is connected with the output end of the first comparator, and the second end of the first diode is connected with the discharging overcurrent feedback end; the first end of the second diode is connected with the output end of the second comparator, and the second end of the second diode is connected with the charging overcurrent feedback end. The utility model provides a detection circuitry overflows the detection that the whole system overflows and discharge and overflow can be realized through the judgement of hardware itself to overflow, has promoted the security of system design.
Description
Technical Field
The utility model relates to an electric automobile technical field especially relates to an overflow detection circuit.
Background
With the entering of new energy steam into the comprehensive policy support stage, the pure electric vehicle technology is continuously mature, the pure electric vehicle occupies more and more in the automobile market, and the safety of the pure electric vehicle is more and more concerned.
In the aspect of safety management and control of electric vehicles, a Battery management system (Battery management system) in an electric vehicle is an electronic device capable of monitoring and managing a storage Battery, and the Battery management system is used for protecting the Battery and a circuit by acquiring and calculating parameters such as voltage, current, temperature and SOC (system on chip) and further controlling the charging and discharging process of the Battery, wherein a current acquisition unit (CSU) is used for detecting the bus current of a power Battery and monitoring the abnormal condition of the current in real time.
For a pure electric vehicle, a storage battery is used for providing power, and the storage battery needs to be charged and discharged frequently, so that the overcurrent detection of the charging current and the discharging current is very important for the normal and safe operation of the whole power system. Therefore, it is necessary to design an over-current detection circuit in the charging and discharging processes of the electric vehicle to improve the safety of the electric vehicle.
Disclosure of Invention
In view of this, the present invention provides an overcurrent detecting circuit to solve the problem of overcurrent state detection in the charging and discharging processes of the battery system of the electric vehicle.
In order to achieve the above object, the present invention provides an over-current detection circuit, which includes a first comparator, a second comparator, a first diode and a second diode; a first input end of the first comparator and a first input end of the second comparator both receive a test voltage signal, a second input end of the first comparator receives a first threshold voltage, and the first threshold voltage is a voltage corresponding to a discharge state overcurrent threshold; a second input end of the second comparator is connected with a second threshold voltage, and the second threshold voltage is a voltage corresponding to a charging state overcurrent threshold; the first end of the first diode is connected with the output end of the first comparator, and the second end of the first diode is connected with the discharging overcurrent feedback end; and the first end of the second diode is connected with the output end of the second comparator, and the second end of the second diode is connected with the charging overcurrent feedback end.
Furthermore, the over-current detection circuit further comprises a voltage division circuit, wherein the voltage division circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor; a first end of the first resistor is connected with a reference power supply end, and a second end of the first resistor is connected with the second input end of the first comparator; a first end of the second resistor is connected to the second end of the first resistor, a second end of the second resistor is grounded, and the first resistor is connected in series with the second resistor to divide a reference voltage signal provided by the reference power supply terminal to provide the first threshold voltage; a first end of the third resistor is connected to the reference power supply end, and a second end of the third resistor is connected to the first input end of the second comparator; the first end of the fourth resistor is connected to the second end of the third resistor, the second end of the fourth resistor is grounded, and the third resistor and the fourth resistor are connected in series to divide the reference voltage signal provided by the reference power supply terminal to provide the second threshold voltage.
Furthermore, a first filter circuit is arranged between the test voltage signal output end and the first input end of the first comparator, and a second filter circuit is arranged between the test voltage signal output end and the second input end of the second comparator.
Furthermore, a first capacitor is connected between a positive power supply end and a negative power supply end of the first comparator, and a second capacitor is connected between a positive power supply end and a negative power supply end of the second comparator.
Further, the first input terminal of the first comparator is a non-inverting input terminal, the second input terminal of the first comparator is an inverting input terminal, and the first terminal of the first diode is a positive electrode; the first input end of the second comparator is an inverting input end, the second input end of the second comparator is a non-inverting input end, and the first end of the second diode is a positive electrode.
Further, the first input terminal of the first comparator is an inverting input terminal, the second input terminal of the first comparator is a non-inverting input terminal, the first terminal of the first diode is a negative terminal, the second terminal of the first diode is a positive terminal, and the second terminal of the first diode is connected to a first power signal terminal; the first input end of the second comparator is a non-inverting input end, the second input end of the second comparator is an inverting input end, the first end of the second diode is a negative electrode, the second end of the second diode is a positive electrode, and the second end of the second diode is connected with the first power signal end.
Further, the over-current detection circuit further comprises a fifth resistor and a sixth resistor; the first end of the fifth resistor is connected with the second end of the first diode, and the second end of the fifth resistor is connected with the discharging overcurrent feedback end; the first end of the sixth resistor is connected with the second end of the second diode, and the second end of the sixth resistor is connected with the charging overcurrent feedback end.
Further, a third filter circuit is arranged between the second end of the fifth resistor and the discharging overcurrent feedback end, and a fourth filter circuit is arranged between the second end of the sixth resistor and the charging overcurrent feedback end.
Further, a first amplitude limiting circuit is arranged between the second end of the fifth resistor and the discharging overcurrent feedback end, and a second amplitude limiting circuit is arranged between the second end of the sixth resistor and the charging overcurrent feedback end.
Furthermore, the overcurrent detection circuit also comprises a current acquisition module, wherein the current acquisition module comprises a current-dividing meter type sensor and a current detection amplification module; two ends of the current-dividing type sensor are respectively connected with the negative electrode of the power battery pack and the high-voltage load; the current detection amplification module comprises an isolation module and a peripheral circuit, wherein the isolation module comprises a first detection end, a second detection end, a bias signal input end, a pre-amplification output end, an adjustment signal input end and a signal output end; the peripheral circuit comprises a seventh resistor, an eighth resistor and a ninth resistor; the first detection end is connected with a first end of the shunt-type sensor, the second detection end is connected with a second end of the shunt-type sensor, and the signal output end is connected with the first input end of the first comparator and the first input end of the second comparator to provide a test voltage signal; a first end of the seventh resistor is connected with the bias signal input end, and a second end of the seventh resistor is connected with a third power supply signal end; a first end of the eighth resistor is connected with the pre-amplification output end, and a second end of the eighth resistor is connected with a second end of the seventh resistor; the first end of the ninth resistor is connected with the adjustment signal input end, the first end of the ninth resistor is connected with the first end of the eighth resistor, and the second end of the ninth resistor is connected with the negative electrode of the power battery pack.
The utility model provides a partly of the current detection module in overcurrent detection circuit as electric automobile battery management System (battery management System), through the corresponding voltage signal input of circuit current who obtains with the current detection circuit collection to the comparator, further with charge overflow and discharge the threshold value that overflows and compare, export corresponding level signal to judge to charge and overflow or discharge and overflow, promoted hardware design and electric automobile's security.
Drawings
Fig. 1 shows an overcurrent detection circuit diagram according to a first embodiment of the present invention.
Fig. 2 shows an overcurrent detection circuit diagram according to a second embodiment of the present invention.
Fig. 3 shows a structure diagram of a current collection module in an over-current detection circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in more detail below with reference to the appended drawings, wherein like elements are represented by like reference numerals and like power ports are represented by like reference numerals, and wherein the components are not drawn to scale for clarity.
Fig. 1 shows an overcurrent detection circuit diagram according to a first embodiment of the present invention.
As shown in fig. 1, the present invention provides an overcurrent detection circuit, including: a first comparator U01A, a second comparator U01B, a first diode D1, and a second diode D2. A first input terminal of the first comparator U01A and a first input terminal of the second comparator U01B both receive the test voltage signal, a second input terminal of the first comparator U01A receives a first threshold voltage V1, and the first threshold voltage is a voltage corresponding to the discharge state overcurrent threshold. A second input terminal of the second comparator U01B is connected to a second threshold voltage V2, and the second threshold voltage V2 is a voltage corresponding to the charging state overcurrent threshold. The first terminal of the first diode D1 is connected to the output terminal of the first comparator U01A, and the second terminal of the first diode D1 is connected to the discharging overcurrent feedback terminal. A first terminal of the second diode D2 is connected to the output terminal of the second comparator U01B, and a second terminal of the second diode D2 is connected to the charging overcurrent feedback terminal.
In one embodiment, a first capacitor C1 is connected between the positive power terminal and the negative power terminal of the first comparator U01A, and a second capacitor C2 is connected between the positive power terminal and the negative power terminal of the second comparator U01B. Noise at the positive power supply terminal can be filtered out by the capacitor between the positive power supply terminal and the negative power supply terminal, and noise generation and unstable working of the comparator are prevented. In the present embodiment, the comparator is powered by a single power supply, that is, a positive power supply terminal of the comparator inputs a positive power supply signal VREF1, and a negative power supply terminal is grounded. But this does not limit the use of dual-supply comparators.
In one embodiment, a first filter circuit 10 is disposed between the test voltage signal output terminal and the first input terminal of the first comparator U01A, and a second filter circuit 11 is disposed between the test voltage signal output terminal and the second input terminal of the second comparator U01B.
In one embodiment, the over-current detection circuit further includes a voltage divider circuit 12, and the voltage divider circuit 12 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first end of the first resistor R1 is connected to a reference power supply terminal, and the second end of the first resistor R1 is connected to the second input terminal of the first comparator U01A. The first end of the second resistor R2 is connected to the second end of the first resistor R1, the second end of the second resistor R2 is grounded, and the first resistor R1 and the second resistor R2 are connected in series to divide the reference voltage signal VREF2 provided by the reference power source terminal to provide the first threshold voltage V1. The first terminal of the third resistor R3 is connected to the reference power source terminal, and the second terminal of the third resistor R3 is connected to the first input terminal of the second comparator U01B. The first end of the fourth resistor R4 is connected to the second end of the third resistor R3, the second end of the fourth resistor R4 is grounded, and the third resistor R3 and the fourth resistor R4 are connected in series to divide the reference voltage signal VREF2 provided by the reference power source terminal to provide the second threshold voltage V2.
In one embodiment, as shown in fig. 1, the first input terminal of the first comparator U01A is a non-inverting input terminal, the second input terminal of the first comparator U01A is an inverting input terminal, and the first terminal of the first diode D1 is a positive terminal. A first input terminal of the second comparator U01B is an inverting input terminal, a second input terminal of the second comparator U01B is a non-inverting input terminal, and a first terminal of the second diode D2 is a positive terminal.
Specifically, if the voltage corresponding to the discharging state overcurrent threshold input by the second input terminal of the first comparator U01A, that is, the first threshold voltage, is set to 3.5V, and the voltage corresponding to the charging state overcurrent threshold input by the second input terminal of the second comparator U01B, that is, the second threshold voltage, is set to 1.5V, when the test voltage signal received at the test voltage signal output terminal is between 1.5V and 3.5V, the output terminals of the first comparator U01A and the second comparator U01B both output low level signals to the discharging overcurrent feedback terminal and the charging overcurrent feedback terminal. When the test voltage signal received at the test voltage signal output end is greater than 3.5V, the first comparator U01A outputs a high level signal, and the second comparator U01B outputs a low level signal, which represents a discharging overcurrent state. When the test voltage signal received at the test voltage signal output terminal is less than 1.5V and greater than 0V, the first comparator U01A outputs a low level signal, and the second comparator U01B outputs a high level signal, which represents a charging overcurrent state.
It should be noted that the logic of the overcurrent state and the output level of the comparator is not limited to this, for example, the input port of the comparator is adjusted, and the first input terminal of the first comparator U01A and the first input terminal of the second comparator U01B are both set as non-inverting input terminals, so that when the discharge overcurrent occurs and the first comparator U01A and the second comparator U01B output high levels at the same time, it can also be determined that the test voltage signal is greater than 3.5V, and because two feedback terminals are provided, it can also be determined that the circuit is in the discharge overcurrent state by hardware and corresponding simple logic.
In one embodiment, as shown in fig. 2, fig. 2 shows an overcurrent detection circuit diagram according to a second embodiment of the present invention. In fig. 2, a first input terminal of the first comparator U01A is an inverting input terminal, a second input terminal of the first comparator U01A is a non-inverting input terminal, a first terminal of the first diode D1 is a negative terminal, a second terminal of the first diode D1 is a positive terminal, and a second terminal of the first diode D1 is connected to the first power signal terminal for receiving the first power signal UCC. A first input terminal of the second comparator U01B is a non-inverting input terminal, a second input terminal of the second comparator U01B is an inverting input terminal, a first terminal of the second diode D2 is a negative terminal, a second terminal of the second diode D2 is a positive terminal, and a second terminal of the second diode D2 is connected to the first power signal terminal for receiving the first power signal UCC. At the moment, the logic corresponding to the overcurrent state and the level signal is changed by reversely connecting the diode and externally connecting a power supply signal to the anode of the diode, and the comparator outputs a high level signal when the overcurrent does not exist. Therefore, the circuit deformation of changing the input end of the comparator, the direction of the diode and then changing the corresponding output logic is within the protection scope of the present invention.
In one embodiment, the over-current detection circuit further includes a fifth resistor R5 and a sixth resistor R6. The first end of the fifth resistor R5 is connected to the second end of the first diode D1, and the second end of the fifth resistor R5 is connected to the discharging overcurrent feedback end. The first end of the sixth resistor R6 is connected with the second end of the second diode, and the second end of the sixth resistor R6 is connected with the charging overcurrent feedback end. The arrangement of the 5 th resistor R5 and the 6 th resistor functions as a protection circuit.
In one embodiment, a third filter circuit 13 is disposed between the second end of the fifth resistor R5 and the discharging overcurrent feedback end, and a fourth filter circuit 14 is disposed between the second end of the sixth resistor R6 and the charging overcurrent feedback end.
In one embodiment, a first limiter circuit 15 is disposed between the second end of the fifth resistor R5 and the discharging overcurrent feedback end, and a second limiter circuit 16 is disposed between the second end of the sixth resistor R6 and the charging overcurrent feedback end. The first amplitude limiting circuit 15 comprises a bidirectional voltage regulator tube D3, the second amplitude limiting circuit 16 comprises a bidirectional voltage regulator tube D4, and the amplitude of the output voltage and the amplitude of the level can be stabilized by arranging the amplitude limiting circuit.
In an embodiment, the over-current detection circuit includes a current collection module, and in an embodiment, please refer to fig. 3 for a specific structure of the current collection module, and fig. 3 shows a structure diagram of the current collection module in the over-current detection circuit according to an embodiment of the present invention. As shown in fig. 3, the current collection module includes a current divider type sensor 31 and a current detection amplification module 32. Two ends of the current-dividing meter type sensor 31 are respectively connected with the negative electrode of the power battery pack and the high-voltage load; the current detection amplifying module 32 comprises an isolation module 321 and a peripheral circuit 322, wherein the isolation module 321 comprises a first detection terminal-IN, a second detection terminal + IN, a bias signal input terminal OFFSET, a pre-amplification output terminal a1, an adjustment signal input terminal a2 and a signal output terminal OUT; the peripheral circuit 322 includes a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. The first detection terminal-IN is connected to the first terminal of the shunt meter type sensor 31, the second detection terminal + IN is connected to the second terminal of the shunt meter type sensor 31, and the signal output terminal OUT serves as a test voltage signal output terminal for providing a test voltage signal. A first terminal of the seventh resistor R7 is connected to the OFFSET signal input terminal OFFSET, and a second terminal of the seventh resistor R7 is connected to the second power signal terminal VREF 3. The first end of the eighth resistor R8 is connected to the pre-amp output A1, and the second end of the eighth resistor R8 is connected to the second end of the seventh resistor R7. The first end of the ninth resistor is connected with the adjustment signal input end A2, the first end of the ninth resistor R9 is connected with the first end of the eighth resistor R8, and the second end of the ninth resistor R9 is connected with the negative electrode of the power battery pack.
Specifically, IN the current collection module of this embodiment, the power signal provided by the second power signal terminal VREF3 is 3.3V, and the configuration of the resistances of the resistors (e.g., the first resistor R1, the second resistor R2, and the third resistor R3) IN the peripheral circuit 322 can bias the voltage signal at the two ends of the shunt meter type sensor 31 obtained by the first detection terminal-IN and the second detection terminal + IN a differential input manner by any value of 0-3.3V, so that the biased voltage signal is greater than 0V. For example, the first resistor R1, the second resistor R2, and the third resistor R3 are configured to forward bias the input signal by 2.5V, so that when the current value is 0, the signal output terminal OUT of the isolation module 321 outputs a voltage value of 2.5V, when the voltage value output by the signal output terminal OUT is greater than 2.5V, the voltage value output by the signal output terminal OUT represents a discharging current, and if the voltage value output by the signal output terminal OUT is less than 2.5V and greater than 0V, the voltage value output by the signal output terminal OUT represents a charging current, and further, the voltage value output by the signal output terminal OUT is input as an input signal to the test voltage signal terminal to perform the determination of the discharging overcurrent and the charging overcurrent.
It should be noted that the ground according to the various embodiments of the present embodiment may be connected to the negative electrode of the power battery pack, i.e., the battery high-voltage ground.
The embodiment of the utility model provides an overcurrent detection circuit can be through the corresponding voltage signal input of circuit current who obtains with current detection module collection to the comparator, further with charge overflow and discharge the threshold value that overflows and carry out the comparison to export corresponding level signal, thereby judge to charge and overflow or discharge and overflow, promoted hardware design and electric automobile's security.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. An over-current detection circuit, comprising: a first comparator, a second comparator, a first diode and a second diode;
a first input end of the first comparator and a first input end of the second comparator both receive a test voltage signal, a second input end of the first comparator receives a first threshold voltage, and the first threshold voltage is a voltage corresponding to a discharge state overcurrent threshold;
a second input end of the second comparator is connected with a second threshold voltage, and the second threshold voltage is a voltage corresponding to a charging state overcurrent threshold;
the first end of the first diode is connected with the output end of the first comparator, and the second end of the first diode is connected with the discharging overcurrent feedback end;
and the first end of the second diode is connected with the output end of the second comparator, and the second end of the second diode is connected with the charging overcurrent feedback end.
2. The overcurrent detection circuit of claim 1, further comprising a voltage divider circuit comprising a first resistor, a second resistor, a third resistor, and a fourth resistor;
a first end of the first resistor is connected with a reference power supply end, and a second end of the first resistor is connected with the second input end of the first comparator;
a first end of the second resistor is connected to the second end of the first resistor, a second end of the second resistor is grounded, and the first resistor is connected in series with the second resistor to divide a reference voltage signal provided by the reference power supply terminal to provide the first threshold voltage;
a first end of the third resistor is connected to the reference power supply end, and a second end of the third resistor is connected to the first input end of the second comparator;
the first end of the fourth resistor is connected to the second end of the third resistor, the second end of the fourth resistor is grounded, and the third resistor and the fourth resistor are connected in series to divide the reference voltage signal provided by the reference power supply terminal to provide the second threshold voltage.
3. The over-current detection circuit according to claim 1, wherein a first filter circuit is disposed between the test voltage signal output terminal and the first input terminal of the first comparator, and a second filter circuit is disposed between the test voltage signal output terminal and the second input terminal of the second comparator.
4. The over-current detection circuit of claim 1, wherein a first capacitor is connected between the positive power supply terminal and the negative power supply terminal of the first comparator, and a second capacitor is connected between the positive power supply terminal and the negative power supply terminal of the second comparator.
5. The over-current detection circuit according to claim 1, wherein the first input terminal of the first comparator is a non-inverting input terminal, the second input terminal of the first comparator is an inverting input terminal, and the first terminal of the first diode is a positive terminal;
the first input end of the second comparator is an inverting input end, the second input end of the second comparator is a non-inverting input end, and the first end of the second diode is a positive electrode.
6. The over-current detection circuit according to claim 1, wherein the first input terminal of the first comparator is an inverting input terminal, the second input terminal of the first comparator is a non-inverting input terminal, the first terminal of the first diode is a negative terminal, the second terminal of the first diode is a positive terminal, and the second terminal of the first diode is connected to a first power signal terminal;
the first input end of the second comparator is a non-inverting input end, the second input end of the second comparator is an inverting input end, the first end of the second diode is a negative electrode, the second end of the second diode is a positive electrode, and the second end of the second diode is connected with the first power signal end.
7. The overcurrent detection circuit of claim 1, further comprising a fifth resistor and a sixth resistor;
the first end of the fifth resistor is connected with the second end of the first diode, and the second end of the fifth resistor is connected with the discharging overcurrent feedback end;
the first end of the sixth resistor is connected with the second end of the second diode, and the second end of the sixth resistor is connected with the charging overcurrent feedback end.
8. The over-current detection circuit according to claim 7, wherein a third filter circuit is disposed between the second terminal of the fifth resistor and the discharging over-current feedback terminal, and a fourth filter circuit is disposed between the second terminal of the sixth resistor and the charging over-current feedback terminal.
9. The over-current detection circuit according to claim 8, wherein a first amplitude limiting circuit is disposed between the second end of the fifth resistor and the discharging over-current feedback end, and a second amplitude limiting circuit is disposed between the second end of the sixth resistor and the charging over-current feedback end.
10. The over-current detection circuit according to claim 1, further comprising a current collection module, wherein the current collection module comprises a current-dividing-meter-type sensor and a current detection amplification module;
two ends of the current-dividing type sensor are respectively connected with the negative electrode of the power battery pack and the high-voltage load;
the current detection amplification module comprises an isolation module and a peripheral circuit, wherein the isolation module comprises a first detection end, a second detection end, a bias signal input end, a pre-amplification output end, an adjustment signal input end and a signal output end; the peripheral circuit comprises a seventh resistor, an eighth resistor and a ninth resistor;
the first detection end is connected with a first end of the shunt-type sensor, the second detection end is connected with a second end of the shunt-type sensor, and the signal output end is connected with the first input end of the first comparator and the first input end of the second comparator to provide a test voltage signal;
a first end of the seventh resistor is connected with the bias signal input end, and a second end of the seventh resistor is connected with a second power supply signal end;
a first end of the eighth resistor is connected with the pre-amplification output end, and a second end of the eighth resistor is connected with a second end of the seventh resistor;
the first end of the ninth resistor is connected with the adjustment signal input end, the first end of the ninth resistor is connected with the first end of the eighth resistor, and the second end of the ninth resistor is connected with the negative electrode of the power battery pack.
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|---|---|---|---|
| CN201920278522.6U CN210090549U (en) | 2019-03-05 | 2019-03-05 | Overcurrent detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920278522.6U CN210090549U (en) | 2019-03-05 | 2019-03-05 | Overcurrent detection circuit |
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| CN210090549U true CN210090549U (en) | 2020-02-18 |
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