CN209858713U - Power battery high-voltage interlocking detection circuit - Google Patents
Power battery high-voltage interlocking detection circuit Download PDFInfo
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Abstract
The utility model provides a power battery high pressure interlocking detection circuitry, includes controller unit and high pressure interlocking detection circuitry, and high pressure interlocking detection circuitry includes first signal conversion module, second signal conversion module and difference comparison module. The first output port of the controller unit is connected with the input end of the first signal conversion module and outputs a first PWM signal to the first signal conversion module, and the output end of the first signal conversion module is connected with the input end of the high-voltage loop. And a second output port of the controller unit is connected with the input end of the second signal conversion module and outputs a second PWM signal to the second signal conversion module, and the output end of the second signal conversion module is connected with the output end of the high-voltage loop. The output end of the first signal conversion module is simultaneously connected with one input end of the differential comparison module, and the output end of the second signal conversion module is simultaneously connected with the other input end of the differential comparison module. The output end of the differential comparison module is connected to the first input port of the controller unit.
Description
Technical Field
The utility model belongs to the technical field of electric automobile, in particular to power battery high pressure interlocking detection circuitry.
Background
Because the power battery system of the electric automobile is usually composed of a plurality of high-voltage subsystems which are mutually connected through high-voltage connectors, the actual operation environment of the high-voltage subsystems is very bad due to the complex road conditions and the working conditions of the electric system in the actual operation process of the automobile, and the high-voltage subsystems are all under the vibration and impact conditions in most of time, the high-voltage interlocking design becomes a key part for ensuring the driving safety and the safety and reliability of vehicle equipment.
The high voltage interlock technology is designed to prevent the danger of high voltage shock that may occur after the high voltage components are exposed. The existing high-voltage interlocking technology generally checks the electrical connection integrity and continuity of all branch circuits connected with a high-voltage bus on an electric vehicle, including system loops such as a whole battery system, a lead, a connector, a DCDC converter, a motor controller and the like, by using a low-voltage signal. When the connection of the high-voltage loop of the whole power battery system is disconnected or the integrity of the high-voltage loop is damaged, the system controller needs to be informed, and then the system controller starts safety protection measures, such as disconnection of a high-voltage main loop and the like. The high voltage connector terminal generally includes a high voltage connection portion, which refers to a high voltage electrical input/output interconnection of the high voltage component, and a low voltage connection portion, which refers to an interlock signal input/output end. And the state change of the high-voltage connecting end in the closing or opening state is always synchronous with the low-voltage connecting part. Therefore, it is usually only necessary to detect the on-off state of the low-voltage connection terminal to indirectly detect whether the high-voltage connection is intact.
The high-voltage interlock detection circuit is used for detecting the on-off state of the low-voltage connection loop, as shown in fig. 1. The existing detection method is that a PWM waveform signal with specific frequency and specific duty ratio is generated by a controller PWM peripheral module, then a controller unit sends the PWM signal at the starting end of a low-voltage connection loop, low-voltage terminals in high-voltage connectors of various high-voltage components are interconnected to form a low-voltage interlocking loop, and the controller unit receives the PWM signal at the tail end of the low-voltage connection loop; and finally, the controller unit judges the on-off state of the low-voltage interlocking loop according to whether the characteristics of the transmitted PWM signal and the received PWM signal are consistent or not, including the frequency and the duty ratio of the PWM signal.
The high-voltage interlocking detection circuit is used as a key point in high-voltage interlocking design, the existing PWM signal detection circuit has the advantages of low cost, simple circuit structure, easy realization, convenient use and the like, and is widely applied after long-term verification. However, the existing high voltage interlock detection circuit still has some disadvantages. For example, the reliability of the existing high-voltage interlock detection circuit in practical use is poor, and particularly, the existing high-voltage interlock detection circuit is easy to be wrongly identified in a complex and severe electromagnetic interference environment. The following describes in detail the root cause of the electromagnetic interference that the conventional high-voltage interlock detection circuit is susceptible to, with reference to fig. 2.
Generally, the formation of electromagnetic interference mainly includes interference sources and coupling paths; the interference source generally refers to a component with a large current change rate, and a large number of high-current, high-power and high-voltage components exist in the electric automobile, and all of the components are easy to generate electromagnetic radiation, for example, an armature part of the motor is accompanied by a high-frequency alternating electromagnetic field during operation. The switching unit of the dc converter will generate strong high frequency electromagnetic interference and so on. The coupling path is a closed loop which is subjected to electromagnetic radiation to form noise current; meanwhile, a low-voltage interlocking terminal in an electric vehicle power distribution system needs a plurality of high-voltage components to be connected with each other in pairs, and the components are dispersed in a certain range, so that a large loop area exists in a low-voltage interlocking loop. In addition, the PWM output end and the input end have larger input and output impedance to the ground, so the low-voltage interlocking loop is equivalent to a closed loop with high impedance and large area. Obviously, the low-voltage interlock loop is easily subjected to electromagnetic interference in an electric vehicle with serious electromagnetic interference.
When the controller sends a PWM signal at the starting end of the low-voltage interlocking loop, the signal is coupled with electromagnetic interference to a certain degree in the low-voltage interlocking loop, so that the waveform of the PWM signal generates distortion to a certain degree, namely, the rising edge and the falling edge of the PWM signal both have random oscillation distortion; when the distorted PWM signal is detected by the controller, the rising edge or the falling edge of the signal becomes abnormal, which causes the controller to fail to effectively identify the actual characteristics of the PWM signal, i.e. the frequency or the duty ratio, and further causes the controller to fail to accurately identify the on-off state of the current low-voltage interlock loop, and in severe cases, the power distribution system of the electric vehicle is accidentally powered off or cannot be powered on, thereby affecting the safe use of the vehicle equipment. In general, the existing improvement method is to add a filter in front of the PWM input of the controller, which can play a role in suppressing interference to some extent; however, the method cannot fundamentally solve the problem of electromagnetic interference, and the method greatly limits the bandwidth of the PWM signal, so that a large delay time exists in the detection process of the controller, the system response is slowed, and the use efficiency of the high-voltage interlock detection circuit is seriously affected.
SUMMERY OF THE UTILITY MODEL
There is the poor shortcoming of interference immunity to traditional high pressure interlocking detection circuitry, the embodiment of the utility model provides a power battery distribution system high pressure interlocking detection circuitry restraines the electromagnetic interference who exists in the electric automobile distribution system effectively, has strengthened current detection circuitry's interference immunity.
The embodiment of the utility model provides an one of, a power battery high pressure interlocking detection circuitry, including controller unit and high pressure interlocking detection circuitry, high pressure interlocking detection circuitry includes first signal conversion module, second signal conversion module and difference comparison module.
The first output port of the controller unit is connected with the input end of the first signal conversion module and outputs a first PWM signal to the first signal conversion module, and the output end of the first signal conversion module is connected with the input end of the high-voltage loop.
And a second output port of the controller unit is connected with the input end of the second signal conversion module and outputs a second PWM signal to the second signal conversion module, and the output end of the second signal conversion module is connected with the output end of the high-voltage loop.
The output end of the first signal conversion module is simultaneously connected with one input end of the differential comparison module, the output end of the second signal conversion module is simultaneously connected with the other input end of the differential comparison module,
the output end of the differential comparison module is connected to the first input port of the controller unit.
The embodiment of the utility model provides a power battery distribution system high pressure interlocking detection circuitry, this circuit are based on the difference detection technique, have very high common mode noise rejection ability, have improved detection circuitry's electromagnetic compatibility, have reduced current high pressure interlocking detection circuitry effectively and have received electromagnetic interference and the wrong rate of discrimination who produces, can be applied to electric automobile's battery open circuit unit and block terminal detection circuitry.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
FIG. 1 is a schematic structural diagram of a high-voltage interlock detection circuit of a conventional power battery power distribution system
FIG. 2 is a schematic diagram of a conventional high-voltage interlock detection circuit susceptible to electromagnetic interference
Fig. 3 the embodiment of the utility model provides an in power battery distribution system high pressure interlocking detection circuitry's schematic structure diagram
Fig. 4 is a schematic diagram of an input/output waveform of the first signal conversion module in an embodiment of the present invention
Fig. 5 is a schematic diagram of an input/output waveform of the second signal conversion module in an embodiment of the present invention
Fig. 6 is a schematic diagram of the input/output waveforms of the differential comparison module in the embodiment of the present invention
Fig. 7 the embodiment of the utility model provides an in power battery distribution system high pressure interlocking detection circuitry's principle schematic diagram
Fig. 8 shows a schematic circuit diagram of a first signal conversion module in an embodiment of the present invention
Fig. 9 is a schematic circuit diagram of a second signal conversion module according to an embodiment of the present invention
Fig. 10 is a schematic circuit diagram of a differential comparison module according to an embodiment of the present invention
Detailed Description
According to one or more embodiments, a schematic structural diagram of a power battery power distribution system high-voltage interlock detection circuit is shown in fig. 3. The utility model discloses a power battery high pressure interlocking detection circuitry mainly includes first signal conversion module, second signal conversion module and difference detection module.
The utility model discloses a power battery high pressure interlocking detection circuitry working process is simple easily to be realized, controller unit output two the same PWM1 signals, all high-tension apparatus connectors all connect when normal in the high-pressure return circuit, high pressure interlocking detection circuitry will export PWM2 signal and give controller unit this moment, controller unit will compare PWM1 signal and PWM2 signal characteristic, two phase difference 180 promptly, its frequency and amplitude will be the same, then the controller will report to vehicle control unit to the event that high pressure return circuit interlocking has succeeded; when any high-voltage equipment connector in the high-voltage loop is in a disconnected state, the high-voltage interlocking detection circuit outputs a continuous high-level state signal to the controller unit, and when the controller unit identifies that the signal is in the continuous high-level state, the controller unit reports an event that the interlocking of the high-voltage loop is unsuccessful to the vehicle control unit. Therefore, the high-voltage interlocking detection circuit can monitor the power connection state of the high-voltage equipment in real time, and safety accidents caused by exposure of the power terminal due to accidental falling of the power connector of the high-voltage equipment are prevented.
According to one or more embodiments, the first signal conversion module converts the amplitude of the PWM signal output by the controller unit, and the frequency of the PWM signal is kept constant. As shown in fig. 4, the PWM signal output from the controller unit changes from 5V to 4V at a high level and from 0V to 2.5V at a low level;
the second signal conversion module also converts the amplitude of the PWM signal output by the controller unit, and the frequency of the PWM signal is kept unchanged. As shown in fig. 5, the PWM signal output from the controller unit changes from 5V to 2.5V at a high level and from 0V to 1V at a low level.
The differential comparison module performs differential comparison on the output end of the high-voltage interlock detection circuit and the low-voltage interlock detection signal of the input end, then obtains a PWM signal of 0V to 5V, and outputs the PWM signal to the PWM capture interface of the controller unit, as shown in fig. 6.
According to one or more embodiments, a schematic diagram of a power battery high voltage interlock detection circuit is shown in fig. 7; specifically, the circuit mainly includes a controller unit, a high-voltage interlock detection circuit, a series matching resistor R11, and a switching section S1.
The controller unit is mainly used for outputting PWM1 and PWM2 signals, and PWM1 and PWM2 keep the frequency, amplitude and phase consistent; then, the PWM3 signal output by the comparator U1 in the high-voltage interlock detection circuit is detected, and the on-off state of the interlock loop is judged by comparing whether the signal characteristics of the PWM1 and the PWM3 are consistent.
The series matching resistor R11 is mainly used for matching the impedance of the interlocking loop, so that the signal quality of each node in the interlocking loop is improved, and the anti-interference characteristic of the interlocking detection circuit is improved.
The switching element S1 is primarily described as simulating the high voltage connector terminals of the interconnected high voltage elements in a practical interlock loop.
The high-voltage interlock detection circuit is mainly used for converting PWM1 and PWM2 signals output by the microcontroller unit into rectangular wave signals with different amplitudes and phases, detecting the characteristics of the signals through the differential detection circuit and outputting PWM3 signals.
According to one or more embodiments, the first signal conversion module mainly includes resistors R1, R2, R3 and R4, an NPN transistor Q1, and a schottky diode D1. As shown in fig. 8. The resistor R1 and the output port of the controller are connected to a node n1 and used as the input end of a PWM1 signal; the resistors R1 and R2 and the b pole of the triode Q1 are connected to a node n 2; the e pole of the 5V power supply and the triode Q1 is connected to the node n 3; the c pole of the transistor Q1 and the anode of the diode D1 are connected to the node n 4; the cathode of the diode D1 and one end of the resistors R3 and R4 are connected to the node n 6; one end of the resistor R3 is connected with the 5V power supply to a node n 5; one end of the resistor R4 is connected to the node n7 with the power ground; the first signal conversion module and the series matching resistor R11 are connected to a node n8, and a node n8 serves as an output terminal of the interlock detection circuit.
According to one or more embodiments, the second signal conversion module is mainly composed of resistors R12, R13, R14, R15, R16, R17 and NPN transistors Q2, Q3, Q4. As shown in fig. 9, the resistor R12 and the controller output port are connected to the node n9 as the input terminal of the PWM2 signal; one end of the resistor R12 and the b pole of the triode Q2 are connected to the node n 10; one end of the resistor R13 is connected with the 5V power supply to a node n 11; one end of each of the resistors R13 and R14 and the c pole of the triode Q2 are connected to a node n 12; the e pole of the transistor Q2 is connected to the node n13 with the power ground; one end of each of the resistors R14 and R15 is connected with the c electrode of the triode Q3 and the b electrode of the triode Q4 to a node n 14; one end of the resistor R15 is connected to the node n15 with the power ground; the e pole of the transistor Q3 is connected to the node n16 with the power ground; the c pole of the triode Q4 and one end of the resistor R17 are connected to the node n 17; the e pole of the triode Q4 and one end of the resistor R16 are connected to the node n 18; one end of the resistor R16 is connected to the node n19 with the power ground; one end of the resistor R17 is connected to the node n20 with the power ground; the second signal conversion module and the series matching resistor R11 are connected to a node n21, and a node n21 is used as an input terminal of the interlock detection circuit.
According to one or more embodiments, the differential comparison module is mainly composed of resistors R5, R6, R7, R8, R9, R10, capacitors C1, C2, and a comparator U1. As shown in fig. 10, one end of the resistor R6 is connected to the node n8 together with the interlock detection circuit output and the interlock loop start end; one end of the resistor R10, the input end of the interlock detection circuit and the tail end of the interlock loop are connected to a node n 17; one end of the resistor R6, one end of the resistor R5 and one end of the capacitor C1 are connected to a node n 22; one end of the capacitor C1 and one end of the resistor R7 are connected with the power ground to the node n 23; one end of the resistors R5 and R7 and the non-inverting end of the comparator U1 are connected to a node n 24; one ends of the resistors R8 and R9 and the negative phase end of the comparator U1 are connected to a node n 25; one end of the resistor R8 is connected with the 5V power supply to a node n 26; one end of the resistors R9 and R10 and one end of the capacitor C2 are connected to a node n 27; one end of the capacitor C2 is connected to the power ground at the node n 28; and the output of the comparator U1 and the input of the controller are connected to the node n29, so that the controller can detect the characteristics of the PWM signal output by the differential comparison module.
According to one or more embodiments, the power battery high-voltage interlock detection circuit includes a first signal conversion module, a second signal conversion module and a differential detection module.
The first signal conversion module mainly comprises resistors R1, R2, R3 and R4, an NPN type transistor Q1 and a Schottky diode D1. As shown in fig. 8, the resistor R1 and the controller output port are connected to the node n1 as the input terminal of the PWM1 signal; the resistors R1 and R2 and the b pole of the triode Q1 are connected to a node n 2; the e pole of the 5V power supply and the triode Q1 is connected to the node n 3; the c pole of the transistor Q1 and the anode of the diode D1 are connected to the node n 4; the cathode of the diode D1 and one end of the resistors R3 and R4 are connected to the node n 6; one end of the resistor R3 is connected with the 5V power supply to a node n 5; one end of the resistor R4 is connected to the node n7 with the power ground; the first signal conversion module and the series matching resistor R11 are connected to a node n8, and a node n8 serves as an output terminal of the interlock detection circuit.
The second signal conversion module mainly comprises resistors R12, R13, R14, R15, R16 and R17 and NPN type crystal triodes Q2, Q3 and Q4. As shown in fig. 9, the resistor R12 and the controller output port are connected to the node n9 as the input terminal of the PWM2 signal; one end of the resistor R12 and the b pole of the triode Q2 are connected to the node n 10; one end of the resistor R13 is connected with the 5V power supply to a node n 11; one end of each of the resistors R13 and R14 and the c pole of the triode Q2 are connected to a node n 12; the e pole of the transistor Q2 is connected to the node n13 with the power ground; one end of each of the resistors R14 and R15 is connected with the c electrode of the triode Q3 and the b electrode of the triode Q4 to a node n 14; one end of the resistor R15 is connected to the node n15 with the power ground; the e pole of the transistor Q3 is connected to the node n16 with the power ground; the c pole of the triode Q4 and one end of the resistor R17 are connected to the node n 17; the e pole of the triode Q4 and one end of the resistor R16 are connected to the node n 18; one end of the resistor R16 is connected to the node n19 with the power ground; one end of the resistor R17 is connected to the node n20 with the power ground; the second signal conversion module and the series matching resistor R11 are connected to a node n21, and a node n21 is used as an input terminal of the interlock detection circuit.
The differential comparison module mainly comprises resistors R5, R6, R7, R8, R9 and R10, capacitors C1 and C2 and a comparator U1. As shown in fig. 10, one end of the resistor R6 is connected to the node n8 together with the interlock detection circuit output and the interlock loop start end; one end of the resistor R10, the input end of the interlock detection circuit and the tail end of the interlock loop are connected to a node n 17; one end of the resistor R6, one end of the resistor R5 and one end of the capacitor C1 are connected to a node n 22; one end of the capacitor C1 and one end of the resistor R7 are connected with the power ground to the node n 23; one end of the resistors R5 and R7 and the non-inverting end of the comparator U1 are connected to a node n 24; one ends of the resistors R8 and R9 and the negative phase end of the comparator U1 are connected to a node n 25; one end of the resistor R8 is connected with the 5V power supply to a node n 26; one end of the resistors R9 and R10 and one end of the capacitor C2 are connected to a node n 27; one end of the capacitor C2 is connected to the power ground at the node n 28; and the output of the comparator U1 and the input of the controller are connected to the node n29, so that the controller can detect the characteristics of the PWM signal output by the differential comparison module.
The first signal conversion module converts the amplitude of the PWM signal output by the controller unit, and the frequency of the PWM signal is kept unchanged. As shown in fig. 4, the PWM signal output from the controller unit changes from 5V to 4V at a high level and from 0V to 2.5V at a low level.
The second signal conversion module also converts the amplitude of the PWM signal output by the controller unit, and the frequency of the PWM signal is kept unchanged. As shown in fig. 5, the PWM signal output from the controller unit changes from 5V to 2.5V at a high level and from 0V to 1V at a low level.
The differential comparison module performs differential comparison on the output end of the high-voltage interlock detection circuit and the low-voltage interlock detection signal of the input end, then obtains a 0V to 5V PWM signal, and outputs the PWM signal to the PWM capture interface of the controller unit, as shown in fig. 6.
According to one or more embodiments, in the high-voltage interlock detection method, a controller outputs two paths of the same PWM1 signal and PWM2 signal, the two paths of the same PWM1 signal and the PWM2 signal are injected into a high-voltage interlock loop, and when the high-voltage circuit is in an interlock unsuccessful state, a high-voltage interlock detection circuit outputs a continuous high-level signal; when the high voltage circuit is in the interlock successful state, the high voltage interlock detection circuit outputs a PWM3 signal, and the PWM3 signal is identical in frequency and amplitude to the PWM1 and PWM2 signals, but 180 ° out of phase.
It is worth noting that while the foregoing has described the spirit and principles of the present invention with reference to several specific embodiments, it is to be understood that the present invention is not limited to the disclosed embodiments, nor is the division of aspects, which is for convenience only as the features in these aspects cannot be combined. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (5)
1. A power battery high-voltage interlocking detection circuit is characterized by comprising a controller unit and a high-voltage interlocking detection circuit, wherein the high-voltage interlocking detection circuit comprises a first signal conversion module, a second signal conversion module and a differential comparison module,
the first output port of the controller unit is connected with the input end of the first signal conversion module and outputs a first PWM signal to the first signal conversion module, the output end of the first signal conversion module is connected with the input end of the high-voltage loop,
a second output port of the controller unit is connected with the input end of the second signal conversion module and outputs a second PWM signal to the second signal conversion module, the output end of the second signal conversion module is connected with the output end of the high-voltage loop,
the output end of the first signal conversion module is simultaneously connected with one input end of the differential comparison module, the output end of the second signal conversion module is simultaneously connected with the other input end of the differential comparison module,
the output end of the differential comparison module is connected to the first input port of the controller unit.
2. The power battery high voltage interlock detection circuit according to claim 1,
the first signal conversion module converts the amplitude of a first PWM signal output by the controller unit, and the frequency of the first PWM signal is kept unchanged;
the second signal conversion module also converts the amplitude of a second PWM signal output by the controller unit, and the frequency of the second PWM signal is kept unchanged;
and the differential comparison module performs differential comparison on the low-voltage interlocking detection signal between the output end and the input end of the high-voltage circuit, outputs a third PWM signal and outputs the third PWM signal to the first input port of the controller unit.
3. The power battery high voltage interlock detection circuit according to claim 2, wherein the first signal conversion module comprises resistors R1, R2, R3 and R4, an NPN transistor Q1, and a Schottky diode D1,
the resistor R1 and the output port of the controller are connected to a node n1 and used as the input end of a PWM1 signal; the resistors R1 and R2 and the b pole of the triode Q1 are connected to a node n 2; the e pole of the 5V power supply and the triode Q1 is connected to the node n 3; the c pole of the transistor Q1 and the anode of the diode D1 are connected to the node n 4; the cathode of the diode D1 and one end of the resistors R3 and R4 are connected to the node n 6; one end of the resistor R3 is connected with the 5V power supply to a node n 5; one end of the resistor R4 is connected to the node n7 with the power ground; the first signal conversion module and the series matching resistor R11 are connected to a node n8, and a node n8 is used as an output terminal of the interlock detection circuit.
4. The power battery high voltage interlock detection circuit according to claim 3, wherein the second signal conversion module is composed of resistors R12, R13, R14, R15, R16, R17 and NPN type transistors Q2, Q3, Q4,
the resistor R12 and the output port of the controller are connected to a node n9 and used as the input end of a PWM2 signal; one end of the resistor R12 and the b pole of the triode Q2 are connected to the node n 10; one end of the resistor R13 is connected with the 5V power supply to a node n 11; one end of each of the resistors R13 and R14 and the c pole of the triode Q2 are connected to a node n 12; the e pole of the transistor Q2 is connected to the node n13 with the power ground; one end of each of the resistors R14 and R15 is connected with the c electrode of the triode Q3 and the b electrode of the triode Q4 to a node n 14; one end of the resistor R15 is connected to the node n15 with the power ground; the e pole of the transistor Q3 is connected to the node n16 with the power ground; the c pole of the triode Q4 and one end of the resistor R17 are connected to the node n 17; the e pole of the triode Q4 and one end of the resistor R16 are connected to the node n 18; one end of the resistor R16 is connected to the node n19 with the power ground; one end of the resistor R17 is connected to the node n20 with the power ground; the second signal conversion module and the series matching resistor R11 are connected to a node n21, and a node n21 is used as an input terminal of the interlock detection circuit.
5. The power battery high voltage interlock detection circuit according to claim 2, wherein the differential comparison module comprises resistors R5, R6, R7, R8, R9, R10, capacitors C1, C2 and a comparator U1,
one end of the resistor R6, the output end of the interlock detection circuit and the starting end of the interlock loop are connected to a node n 8; one end of the resistor R10, the input end of the interlock detection circuit and the tail end of the interlock loop are connected to a node n 17; one end of the resistor R6, one end of the resistor R5 and one end of the capacitor C1 are connected to a node n 22; one end of the capacitor C1 and one end of the resistor R7 are connected with the power ground to the node n 23; one end of the resistors R5 and R7 and the non-inverting end of the comparator U1 are connected to a node n 24; one ends of the resistors R8 and R9 and the negative phase end of the comparator U1 are connected to a node n 25; one end of the resistor R8 is connected with the 5V power supply to a node n 26; one end of the resistors R9 and R10 and one end of the capacitor C2 are connected to a node n 27; one end of the capacitor C2 is connected to the power ground at the node n 28; and the output terminal of the comparator U1 and the input terminal of the controller are connected to the node n29, so that the controller unit can detect the characteristics of the third PWM signal output by the differential comparison module.
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| CN109541494A (en) * | 2019-01-08 | 2019-03-29 | 常州索维尔电子科技有限公司 | Power battery high-voltage interlocking detection circuit and method |
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| CN109541494A (en) * | 2019-01-08 | 2019-03-29 | 常州索维尔电子科技有限公司 | Power battery high-voltage interlocking detection circuit and method |
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Address after: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee after: Changzhou Shiwei Electronics Co.,Ltd. Address before: 213000 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU SOARWHALE ELECTRONIC TECHNOLOGY Co.,Ltd. |
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