CN219918419U - Input power supply protection circuit, brake controller and automobile - Google Patents
Input power supply protection circuit, brake controller and automobile Download PDFInfo
- Publication number
- CN219918419U CN219918419U CN202321582084.5U CN202321582084U CN219918419U CN 219918419 U CN219918419 U CN 219918419U CN 202321582084 U CN202321582084 U CN 202321582084U CN 219918419 U CN219918419 U CN 219918419U
- Authority
- CN
- China
- Prior art keywords
- module
- power supply
- resistor
- protection
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002441 reversible effect Effects 0.000 claims abstract description 48
- 230000002265 prevention Effects 0.000 claims abstract description 43
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000001052 transient effect Effects 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 18
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 49
- 230000005669 field effect Effects 0.000 claims description 38
- 239000002131 composite material Substances 0.000 claims description 25
- 150000001875 compounds Chemical class 0.000 claims description 15
- 230000008030 elimination Effects 0.000 claims description 15
- 238000003379 elimination reaction Methods 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model relates to an input power supply protection circuit, a brake controller and an automobile, which comprises a primary protection circuit, a secondary protection circuit, a first driving module, a second driving module, an MCU module and a first power supply, wherein the primary protection circuit is connected with the secondary protection circuit; the primary protection circuit comprises a transient overvoltage protection module for inhibiting the instantaneous high voltage and static discharge of the first power supply and an anti-reverse connection protection module for preventing current from flowing into a later-stage circuit when the first power supply is reversely connected; the secondary protection circuit comprises a redundancy detection module for preventing current from flowing into the rear-stage circuit when the first power supply is reversely connected, a backflow prevention module for unidirectionally transmitting signals of the first power supply to the rear-stage circuit, and a filtering module for filtering ripple limitation and alternating current interference of the first power supply. The utility model protects the power input end of the brake controller from the aspects of overvoltage, reverse connection, backflow prevention and the like, improves the use reliability and foolproof performance of the brake controller, and reduces the maintenance cost.
Description
Technical Field
The utility model relates to the technical field of input power supply protection circuits, in particular to an input power supply protection circuit, a brake controller and an automobile.
Background
Braking systems are one of the important components of automobiles, which are directly related to the comprehensive performance and life and property safety of automobiles. In a brake system, an automotive brake belongs to one of the most important components of the brake system. The automobile brake controller belongs to a product with higher functional safety level and has various functional safety characteristic requirements. Wherein,, in order to ensure the effective work of the power input end of the brake controller and avoid the damage of the whole system caused by the factors of unexpected occurrence of short circuit, reverse connection, overvoltage, overcurrent, device failure and the like of a power circuit. The traditional protection circuit is mostly concentrated in the overcurrent and overvoltage of the protection circuit, and the accidental failure condition of the device and the current backflow condition of the later-stage circuit are not protected. In addition, the traditional protection circuit is mainly passively protected according to the device characteristics because the power supply system is single-path power supply.
An input power protection circuit for an automobile controller as disclosed in patent document CN212323705U, wherein an input end of an overvoltage and overcurrent detection module is connected with a power input end; the output ends of the overvoltage and overcurrent detection modules are respectively connected with the input end of the MOS tube control module; the MOS tube control module is arranged in parallel between the source electrode and the grid electrode of the switch MOS; the source electrode of the switch MOS is connected with the overcurrent detection module; the drain electrode of the switch MOS is used as a power supply output end to be connected with an external circuit; the overcurrent detection module and the MOS tube control module are respectively connected with the ground. The input power supply protection circuit of the automobile controller provided by the utility model realizes the protection of the protection power supply through the on and off of the field effect transistor, solves the problems that the power supply cannot work due to overcurrent of the controller, the power supply cannot be recovered after the controller is recovered to be normal, and the controller is unstable in work and low in safety after the current limiting protection of the power supply of the controller. However, the technology applied in the patent is to perform reverse connection prevention protection through the characteristics of the MOS tube, and only overvoltage and overcurrent detection and reverse prevention protection can be realized. In the application of an automobile controller, the battery power is often supplied to multiple loads together, and the problem of the reverse connection prevention technology is that if the rear-stage load is an inductive load, a motor load and the like, current backflow is easy to form, so that the work of other products at the front stage is influenced.
Therefore, it is necessary to develop an input power supply protection circuit, a brake controller, and an automobile.
Disclosure of Invention
The utility model aims to provide an input power supply protection circuit, a brake controller and an automobile, so as to solve the problem of current backflow of a later-stage circuit and improve the foolproof performance of the circuit.
A first aspect of the present utility model provides an input power supply protection circuit, comprising:
the primary protection circuit comprises a transient overvoltage protection module for inhibiting instantaneous high voltage and static discharge of the connected first power supply and an anti-reverse connection protection module for preventing current from flowing into the rear-stage circuit when the first power supply is reversely connected, wherein the transient overvoltage protection module is respectively connected with the first power supply and the anti-reverse connection protection module;
the secondary protection circuit comprises a redundancy detection module for preventing the reverse connection prevention protection module from failing, a reverse flow prevention module for unidirectionally transmitting signals of the first power supply to a later-stage circuit, and a filtering module for filtering ripple limitation and alternating current interference of the first power supply, wherein the reverse connection prevention protection module is connected with the redundancy detection module, and the reverse flow prevention module is respectively connected with the reverse connection prevention protection module, the redundancy detection module and the filtering module;
the driving circuit comprises a first driving module for controlling the anti-reverse connection protection module to be opened or closed, an operation module for performing operation, and a second driving module for controlling the anti-reverse flow module to be opened or closed, wherein the first driving module is connected with the operation module, and the first driving module and the operation module are also respectively connected with the anti-reverse connection protection module; the second driving module is connected with the backflow preventing module;
the boost circuit comprises a first boost module for boosting the voltage of a first driving module and a second boost module for boosting the voltage of a second driving module, wherein the first boost module is respectively connected with the first driving module and the operation module, and the second boost module is connected with the second driving module;
the MCU module is used for monitoring the running conditions of the reverse connection prevention protection module and the reverse flow prevention module and controlling the on-off of the first driving module and the second driving module based on the running conditions of the reverse connection prevention protection module and the reverse flow prevention module, and is respectively connected with the first driving module, the second driving module, the reverse connection prevention protection module and the reverse flow prevention module;
and a second power supply for supplying power to the MCU module, the second power supply being connected with the MCU module.
According to the technical means, the utility model can solve the potential safety hazard caused by overvoltage output by an output power supply, reverse connection of positive and negative poles and current backflow of a rear-stage circuit, and can also avoid the problem that the rear-stage circuit cannot work normally due to failure of the front-stage circuit.
Further, the transient overvoltage protection module comprises a TVS diode D1, a capacitor C1, a fuse F1 and a fuse F2;
one end of the TVS diode D1 is grounded after passing through the fuse F1;
one end of the capacitor C1 is grounded through the fuse F2.
Further, the reverse connection preventing protection module comprises a resistor R1, a double-path zener diode Q1 and an N-channel field effect transistor Q2;
the connection point of the 1 pin of the two-way zener diode Q1 and one end of the resistor R1 is connected with the grid electrode of the N-channel field effect transistor Q2, the source electrode of the N-channel field effect transistor Q2 is connected with the connection point of the 2 pin of the two-way zener diode Q1 and the other end of the resistor R1, and the drain electrode of the N-channel field effect transistor Q2 is connected with the output end of the transient overvoltage protection module.
According to the technical means, when the input of the first power supply is reversed, the first power supply only provides 0V voltage. According to the conduction characteristic of the N-channel field effect transistor Q2, the N-channel field effect transistor Q2 is disconnected to damage a subsequent circuit. Meanwhile, when the output voltage of the first boost module exceeds a preset value, the voltage can be stabilized within a preset range value according to the characteristics of the two-way zener diode Q1.
Further, the redundancy detection module comprises an NPN triode Q3, a resistor R2, a resistor R3 and a diode D2;
the base electrode of the NPN triode Q3 is connected with a connecting point of one end of a resistor R2 and one end of a resistor R3, the other end of the resistor R2 is grounded, the connecting point of the other end of the resistor R3 and the emitter electrode of the NPN triode Q3 is connected with the positive electrode of a diode D2, and the negative electrode of the diode D2 is respectively connected with an anti-reverse connection protection module and an anti-reverse connection module.
According to the above technical means, when the first power supply works normally, the base of NPN triode Q3 is grounded, so the circuit is not turned on. When the first power supply is reversely connected, the NPN triode Q3 is conducted, and the voltage at the MCU_BAT1_AD1 is pulled to 0V, so that the later-stage circuit cannot work normally. Meanwhile, after the MCU module detects that the voltage at the position is abnormal, the on-off of the first driving module and the second driving module is controlled. The Schottky diode is adopted in D2, the voltage drop is small when the Schottky diode is conducted in the forward direction, and the electricity consumption of a later-stage circuit is not affected.
Further, the backflow prevention module comprises a resistor R4, a two-way zener diode Q4 and an N-channel field effect transistor Q5;
the connection point of the 2 pin of the two-way zener diode Q4 and one end of the resistor R4 is connected with the connection point of the grid electrode of the N-channel field effect transistor Q5 and the redundancy detection module, the connection point of the 1 pin of the two-way zener diode Q4 and the other end of the resistor R4 is connected with the source electrode of the N-channel field effect transistor Q5, and the drain electrode of the N-channel field effect transistor Q5 is connected with the MCU_BAT1_AD2 pin of the MCU module.
According to the technical means, when the input voltage of the first power supply is reversed, the N-channel field effect transistor Q5 is not conducted, and no output is generated in the later stage. When the second boost module boosts the voltage to cause the input of the anti-backflow module to exceed the preset value, the two-way zener diode Q4 stabilizes the input within the preset value. When the second boosting module works normally, the second driving module is driven to output voltage and the N-channel field effect transistor Q5 is driven to be effectively conducted. According to the conduction characteristic of the N-channel field effect transistor Q5, current in the later-stage circuit cannot enter the earlier-stage circuit through the N-channel field effect transistor Q5, so that the anti-backflow effect is achieved.
Further, the filtering module comprises a capacitor C2, a capacitor C3, an inductor L1, a fuse F3 and a fuse F4;
one end of the capacitor C2 is connected with one end of the capacitor C3 through the inductor L1 to form a pi-shaped filter, the other end of the capacitor C2 is grounded after passing through the fuse F3, and the other end of the capacitor C3 is grounded after passing through the fuse F4.
According to the technical means, when the capacitor C2 and the capacitor C3 are different in capacitance value, the filtering effect and the ripple limitation in different scenes can be dealt with. In addition, due to the characteristics of the fuses, when the capacitor C2 and the capacitor C3 are in failure short circuit, the fuse F3 and the fuse F4 are fused, so that the normal operation of the subsequent-stage circuit is ensured. Thereby performing double protection.
Further, the first driving module comprises a composite band-stop triode Q6, a resistor R5 and a capacitor C4,
the 1 pin of the composite band-stop triode Q6 is connected with GND, the 2 pin of the composite band-stop triode Q6 is connected with the MCU_CTRL1 pin of the MCU module, the 6 pin and the 5 pin of the composite band-stop triode Q6 are respectively connected with two ends of the resistor R5 in a one-to-one correspondence manner, and the 3 pin of the composite band-stop triode Q6 is connected with the first boost module through a connection point of the capacitor C4 and the 4 pin of the composite band-stop triode Q6;
the second driving module comprises a composite band-stop triode Q7, a resistor R6, a resistor R7 and a capacitor C5,
GND is connected to 1 foot of compound band elimination triode Q7, and compound band elimination triode Q7's 2 foot is connected with MCU_CTRL2 foot of MCU module, compound band elimination triode Q7's 6 foot and 5 foot are connected with resistance R6's both ends one-to-one respectively, compound band elimination triode Q7's 3 foot connects resistance R7 and electric capacity C5's one end respectively, compound band elimination triode Q7's 4 foot and electric capacity C5's tie point of other end connects the second boost module.
Further, the power supply system further comprises an operation module, wherein the operation module is a common-cathode double diode D3, a 2 pin of the common-cathode double diode D3 is connected with the first driving module, and a 1 pin of the common-cathode double diode D3 is connected with the first boosting module.
According to the technical means, the first driving module and the common cathode double diode D3 are used for realizing the opening or closing of the reverse connection prevention protection module through line and logic operation.
In a second aspect, the present utility model also provides a brake controller employing an input power protection circuit as described in the present utility model.
In a third aspect, the utility model also provides an automobile employing a brake controller as described in the utility model.
The utility model has the beneficial effects that:
1. by arranging the transient overvoltage protection module at the input end of the first power supply, the transient high voltage and static discharge of the first power supply can be restrained. Meanwhile, the fuse is arranged in the transient overvoltage protection module, so that the double protection function can be realized, and the normal operation of a later-stage circuit is ensured;
2. by arranging the reverse connection preventing protection module at the rear end of the transient overvoltage protection module, when the first power supply is reversely connected, the N-channel field effect transistor Q2 of the reverse connection preventing protection module does not work; when the output voltage of the first boosting module exceeds a preset value, the voltage stabilizing effect can be achieved according to the characteristics of the two-way diode (namely the two-way zener diode Q1);
3. by arranging the redundancy detection module at the rear end of the reverse connection prevention protection module, when the transient overvoltage protection module fails and the first power supply is reversely connected, the input voltage of the redundancy detection module (namely, the position of MCU_BAT1_AD 1) is 0V, so that the rear-stage module does not work. Meanwhile, after the MCU module detects that the voltage at the position is abnormal, the on-off of the first driving module and the second driving module is controlled.
4. By arranging the anti-backflow module at the rear end of the redundancy detection module, when the first power supply is reversely connected, the N-channel field effect transistor Q5 in the anti-backflow module is not conducted, and the rear stage has no output; meanwhile, when the output voltage of the second boosting module exceeds a preset value, the two-way zener diode Q4 in the backflow prevention module can clamp the voltage at the position within a preset range value; because of the self-conduction characteristic of the NMOS tube (namely the N-channel field effect tube Q5 in the backflow prevention module), current in the later-stage circuit cannot enter the earlier-stage circuit through the NMOS tube, so that the backflow prevention effect is achieved.
5. The first power input end is comprehensively protected from the aspects of overvoltage, reverse connection, transient high voltage and the like of the power supply voltage, so that the reliability and foolproof performance of the brake controller are improved, and the maintenance cost is reduced.
Drawings
FIG. 1 is a system block diagram of an input power protection circuit in the present embodiment;
FIG. 2 is a circuit diagram of an input power protection circuit (except for an MCU module, a boost circuit, a first power supply and a second power supply) in the present embodiment;
wherein:
the system comprises a 1-transient overvoltage protection module, a 2-reverse connection prevention protection module, a 3-redundancy detection module, a 4-backflow prevention module, a 5-filtering module, a 6-first driving module, a 7-second driving module, an 8-MCU module, a 9-operation module, a 10-first boosting module, an 11-second boosting module, a 12-first power supply and a 13-second power supply.
Detailed Description
Further advantages and effects of the present utility model will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Referring to fig. 1 and 2, in the present embodiment, an input power protection circuit includes:
the primary protection circuit comprises a transient overvoltage protection module 1 for inhibiting instantaneous high voltage and static discharge of an accessed first power supply 12 and a reverse connection prevention protection module 2 for preventing current from flowing into a later-stage circuit when the first power supply 12 is reversely connected, wherein the transient overvoltage protection module 1 is respectively connected with the first power supply 12 and the reverse connection prevention protection module 2.
A secondary protection circuit comprising a redundancy detection module 3 for preventing failure of the anti-reverse protection module 2, an anti-reverse module 4 for unidirectionally transmitting a signal of the first power supply 12 to a subsequent circuit, and a filtering module 5 for filtering out ripple limitation and ac interference of the first power supply 12. The anti-reverse connection protection module 2 is connected with the redundancy detection module 3, and the anti-reverse flow module 4 is respectively connected with the anti-reverse connection protection module 2, the redundancy detection module 3 and the filtering module 5.
The driving circuit comprises a first driving module 6 for controlling the anti-reverse connection protection module 2 to be opened or closed, an operation module 9 for performing operation and a second driving module 7 for controlling the anti-reverse connection protection module 4 to be opened or closed. The first driving module 6 is connected with the operation module 9, and the first driving module 6 and the operation module 9 are also connected with the anti-reverse connection protection module 2 respectively; the second drive module 7 is connected with the backflow prevention module 4.
A boost circuit comprising a first boost module 10 for boosting the voltage of the first drive module 6 and a second boost module 11 for boosting the voltage of the second drive module 7. The first boosting module 10 is respectively connected with the first driving module 6 and the operation module 9, and the second boosting module 11 is connected with the second driving module 7;
the MCU module 8 is used for monitoring the operation conditions of the reverse connection preventing protection module 2 and the reverse flow preventing module 4 and controlling the on-off of the first driving module 6 and the second driving module 7 based on the operation conditions of the reverse connection preventing protection module 2 and the reverse flow preventing module 4. The MCU module 8 is respectively connected with the first driving module 6, the second driving module 7, the reverse connection preventing protection module 2 and the reverse flow preventing module 4.
And a second power supply 13 for supplying power to the MCU module 8, the second power supply 13 being connected to the MCU module 8.
Where V_OUT is the output pin of the circuit of the present utility model.
In summary, by providing a primary protection circuit and a secondary protection circuit. The input of the first power supply 12 can thus be fully protected from mains overvoltage, reverse connection and transient high voltages. Therefore, not only the reliability and foolproof of the brake controller are improved, but also the maintenance cost is reduced.
For ease of understanding, the following description is provided in detail with respect to the transient overvoltage protection module 1 of the primary protection circuit.
Further, in some embodiments, the transient overvoltage protection module 1 comprises: including TVS diode D1, capacitor C1, fuse F1, and fuse F2. Preferably, the TVS diode D1 is of the type SMBJ24CA, but is not limited thereto. The connection relation is as follows:
one end of the TVS diode D1 is grounded through a fuse F1, and one end of the capacitor C1 is grounded through a fuse F2.
The specific working principle is as follows: the first power supply 12 first passes through the TVS diode D1, and when the first power supply 12 generates a transient overvoltage, the TVS diode D1 can stabilize the voltage of the first power supply 12 within a preset range value, so as to realize transient overvoltage protection. The capacitor C1 is connected to the input terminal of the first power supply 12, and is used for filtering the voltage input of the first power supply 12. Fuse F1 and fuse F2 are connected in series with TVS diode D1 and capacitor C1 to ground, respectively. Due to the characteristics of the fuse, when the TVS diode D1 and the capacitor C1 are in failure short circuit, the fuse F1 and the fuse F2 are fused, so that the normal operation of the rear-stage circuit is ensured.
Specifically, for the application field of the vehicle circuit, the TVS diode D1 is used for input transient suppression and ESD protection of the vehicle system power supply, so as to protect the positive and negative transient voltages of the vehicle normal operation device. TVS diode D1 is selected to meet the worst case steady state voltage for system operation, and transient voltage suppression and ESD suppression are required to meet ISO7637-2 and ISO16750-2 specifications. The capacitor C1 is used for ESD protection, and when the input circuit is matched with the discharge model, the charge is discharged in an equalizing manner through the capacitor C1.
For ease of understanding, the anti-reverse protection module 2 of the primary protection circuit is described in detail below.
Further, in some embodiments, the anti-reverse protection module 2 comprises: resistor R1, two-way zener diode Q1 and N channel field effect transistor Q2. Preferably, the N-channel field effect transistor Q2 is of the type BUK7S1R0-40H, but is not limited thereto. The connection relation is as follows:
the connection point of the 1 pin of the two-way zener diode Q1 and one end of the resistor R1 is connected with the grid electrode of the N-channel field effect transistor Q2, the source electrode of the N-channel field effect transistor Q2 is connected with the connection point of the 2 pin of the two-way zener diode Q1 and the other end of the resistor R1, and the drain electrode of the N-channel field effect transistor Q2 is connected with the output end of the transient overvoltage protection module 1.
The specific working principle is as follows: when the input of the first power supply 12 is reversed (i.e., kl30_ubm is reversed to GND in the figure), the first power supply 12 supplies a voltage of 0V. At this time, the N-channel fet Q2 is turned off to avoid damage to the subsequent stage when the first power source 12 is connected in reverse. In order to turn on the N-channel fet Q2, V of the N-channel fet Q2 is required GS Greater than its threshold voltage. In this case, a first drive module 6 and a computing module 9 are therefore connected to the anti-reverse connection protection module 2 for controlling the opening or closing of the anti-reverse connection protection module 2. The output of the electrical signal of the first driving module 6 is implemented by a line and logic operation through an operation module 9. In addition, since the two-way zener diode Q1 shares the anode, when the output voltage of the first boost module 10 exceeds the preset voltage, the two-way zener diode Q1 realizes the zener diode function by suspending the anode sharing terminal, so that the voltage can be clamped within the preset voltage range. With continued reference to the following, it will be specifically described how the first driving module 6 and the operation module 9 implement the control anti-reverse protection module 2.
For ease of understanding, the first drive module 6 and the operation module 9 are described in detail below.
Further, in some embodiments, the first drive module 6 comprises: the composite band-stop triode Q6, the resistor R5 and the capacitor C4. Preferably, the composite band stop triode Q6 is of the type PUMD12, but is not limited thereto. The connection relation is as follows:
the 1 foot of the composite band-stop triode Q6 is connected with GND, the 2 foot of the composite band-stop triode Q6 is connected with the MCU_CTRL1 foot of the MCU module 8, the 6 foot and the 5 foot of the composite band-stop triode Q6 are respectively connected with two ends of the resistor R5 in one-to-one correspondence, and the 3 foot of the composite band-stop triode Q6 is connected with the first boost module 10 through a connection point of the capacitor C4 and the 4 foot of the composite band-stop triode Q6.
Further, in some embodiments, the operation module 9 is a common cathode dual diode D3. Preferably, the common cathode double diode D3 is of the type BAT54CW. But is not limited thereto. The connection relation is as follows: the 2 pin of the common-cathode double diode D3 is connected with the connection point of the 3 pin of the composite band-stop triode Q6 and the capacitor C4, and the 1 pin of the common-cathode double diode D3 is connected with the first boosting module 10.
The specific working principle is as follows: by adding a first drive module 6 and a common cathode double diode D3 to the input of the anti-reverse protection module 2. The voltage of the first driving module 6 and the common-cathode dual diode D3 is boosted by the first boosting module 10 and then subjected to a row and logic operation. When the MCU_CTRL1 pin signal is in a low level or high resistance state, two triodes in the composite band-stop triode Q6 are conducted. The level of the 2 pin of the common cathode double diode D3 is HDG level, and the input of the 1 pin is PDG level. In this circuit, the output of the common-cathode dual diode D3 will be high only when the 1-pin and 2-pin inputs are high, so that the N-channel fet Q2 will be turned on. When the first boost module 10 boosts to cause the input voltage of the anti-reverse connection protection module 2 to exceed the preset value, the two-way zener diode Q1 can be stabilized within the preset value through the floating common positive terminal.
For ease of understanding, the redundant detection module 3 of the secondary protection circuit is described in detail below.
Further, in some embodiments, the redundancy detection module 3 includes: NPN transistor Q3, resistor R2, resistor R3, and diode D2. Preferably, diode D2 is a schottky diode, model BAT54CW, but is not limited thereto. The voltage drop is small when the power supply is conducted in the forward direction, and the power consumption of the rear-stage circuit is not affected. The connection relation is as follows:
the base electrode of the NPN triode Q3 is connected with a connecting point of one end of a resistor R2 and one end of the resistor R3, the other end of the resistor R2 is grounded, the connecting point of the other end of the resistor R3 and the emitter electrode of the NPN triode Q3 is connected with the positive electrode of a diode D2, and the connecting point of the negative electrode of the diode D2 and the source electrode of the N channel field effect tube Q2 is connected with the foot MCU_BAT1_AD1 of the MCU module 8.
The specific working principle is as follows: when the first power supply 12 is operating normally, the base of the NPN transistor Q3 is grounded, and therefore the circuit is not conductive. When the first power supply 12 is reversely connected, the NPN triode Q3 is turned on, and the voltage at the mcu_bat1_ad1 is pulled to 0V, so that the subsequent stage circuit cannot operate normally. Meanwhile, after the MCU module 8 detects that the voltage at the position is abnormal, the on-off of the first driving module 6 and the second driving module 7 is controlled.
For ease of understanding, the anti-backflow module 4 of the secondary protection circuit is described in detail below.
Further, in some embodiments, the anti-backflow module 4 includes a resistor R4, a two-way zener diode Q4, and an N-channel field effect transistor Q5. Preferably, the N-channel field effect transistor Q5 is of the type BUK7S1R0-40H, but is not limited thereto. Of course, the N-channel fet Q5 may be replaced by a P-type MOS transistor or other type transistor. The connection relation is as follows: the connection point of the pin 2 of the two-way zener diode Q4 and one end of the resistor R4 is connected with the connection point of the grid electrode of the N-channel field effect transistor Q5 and the collector electrode of the NPN triode Q3 of the redundancy detection module 3, the connection point of the pin 1 of the two-way zener diode Q4 and the other end of the resistor R4 is connected with the source electrode of the N-channel field effect transistor Q5, and the drain electrode of the N-channel field effect transistor Q5 is connected with the foot of the MCU_BAT1_AD2 of the MCU module 8.
The specific working principle is as follows: when the input voltage of the first power supply 12 (namely kl30_ubm in the figure) is reversed, the N-channel field effect transistor Q5 is not conducted, and no output is generated in the subsequent stage. When the input voltage of the anti-backflow module 4 exceeds the preset value due to the boosting of the second boosting module 11, the voltage stabilizing diode function is realized by suspending the common positive end inside the double-path zener diode Q4, and the voltage value is stabilized within the preset range value. When the second boost module 11 works normally, the second drive module 7 can be driven to output the voltage required by the N-channel fet Q5, so that the N-channel fet Q5 is turned on. As can be seen from the figure, the N-channel fet Q5 is equivalent to a switching transistor connected in parallel with a diode. When the first power supply 12 is turned off, the switching tube is turned off and blocked by the diode. When the first power supply 12 is turned on, there is an output current to turn on the switching tube, which can ensure unidirectional conduction and reduce loss occurring during forward conduction. Thereby playing a role in preventing backflow.
For ease of understanding, the filter module 5 of the secondary protection circuit is described in detail below.
Further, in some embodiments, the filtering module 5 includes a capacitor C2, a capacitor C3, an inductor L1, a fuse F3, and a fuse F4. Preferably, in some embodiments, C2 may be a ceramic capacitor and capacitor C3 may be an electrolytic capacitor, but is not limited thereto. The connection relation is as follows: one end of the capacitor C2 is connected with one end of the capacitor C3 through the inductor L1 to form a pi-shaped filter, the other end of the capacitor C2 is grounded through the fuse F3, and the other end of the capacitor C3 is grounded through the fuse F4.
The specific working principle is as follows: when the capacitor C2 and the capacitor C3 select different capacitance values, the filtering effect and the ripple limitation in different scenes can be dealt with. In addition, due to the characteristics of the fuses, when the capacitor C2 and the capacitor C3 fail and are short-circuited, the fuse F3 and the fuse F4 are fused, so that the normal operation of the subsequent-stage circuit is ensured. Therefore, double protection is performed, and the safety is improved.
For ease of understanding, the second drive module 7 is described in detail below.
Further, in some embodiments, the second driving module 7 includes a composite band-stop transistor Q7, a resistor R6, a resistor R7, and a capacitor C5. The model of the composite band-stop triode Q7 is PUMD12, but is not limited to the same. The connection relation is as follows: GND is connected to 1 foot of compound band elimination triode Q7, and 2 feet of compound band elimination triode Q7 are connected with MCU_CTRL2 feet of MCU module 8, and 6 feet and 5 feet of compound band elimination triode Q7 are connected with resistance R6's both ends one-to-one respectively, and resistance R7 and electric capacity C5's one end are connected respectively to compound band elimination triode Q7's 3 feet, and compound band elimination triode Q7's 4 feet and electric capacity C5's other end's tie point connects second boost module 11.
The specific working principle is as follows: when the second boost module 11 outputs the voltage to the preset value, the second driving module 7 can provide the turn-on voltage required by the N-channel fet Q5.
In this embodiment, the boost circuit is an integrated driving chip, which can be selected according to practical situations, and this can be easily realized by those skilled in the art, and will not be described in detail.
In summary, the embodiment comprehensively protects the input power supply of the brake controller from the aspects of overvoltage protection, reverse connection protection, current backflow protection and the like. The protection level requirements and maintenance cost for faults such as overvoltage of the back-end circuit are reduced, and the use reliability and foolproof performance of the brake controller are improved.
The present embodiment also provides a brake controller employing the input power supply protection circuit as described in the present embodiment.
The present embodiment also provides an automobile employing the brake controller as described in the present embodiment.
The embodiments described above are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present utility model should be made in the equivalent manner, and are included in the scope of the present utility model.
Claims (10)
1. An input power supply protection circuit, comprising:
the primary protection circuit comprises a transient overvoltage protection module (1) for inhibiting instantaneous high voltage and static discharge of an accessed first power supply (12) and a reverse connection prevention protection module (2) for preventing current from flowing into a later-stage circuit when the first power supply (12) is reversely connected, wherein the transient overvoltage protection module (1) is respectively connected with the first power supply (12) and the reverse connection prevention protection module (2);
the secondary protection circuit comprises a redundancy detection module (3) for preventing the reverse connection prevention protection module (2) from being invalid, a reverse flow prevention module (4) for unidirectionally transmitting signals of the first power supply (12) to a later-stage circuit, and a filtering module (5) for filtering ripple limitation and alternating current interference of the first power supply (12), wherein the reverse connection prevention protection module (2) is connected with the redundancy detection module (3), and the reverse flow prevention module (4) is respectively connected with the reverse connection prevention protection module (2), the redundancy detection module (3) and the filtering module (5);
the driving circuit comprises a first driving module (6) for controlling the anti-reverse connection protection module (2) to be opened or closed, an operation module (9) for performing operation, and a second driving module (7) for controlling the anti-reverse connection protection module (4) to be opened or closed, wherein the first driving module (6) is connected with the operation module (9), and the first driving module (6) and the operation module (9) are also respectively connected with the anti-reverse connection protection module (2); the second driving module (7) is connected with the backflow prevention module (4);
the boost circuit comprises a first boost module (10) for boosting the voltage of the first driving module (6) and a second boost module (11) for boosting the voltage of the second driving module (7), wherein the first boost module (10) is respectively connected with the first driving module (6) and the operation module (9), and the second boost module (11) is connected with the second driving module (7);
the MCU module (8) is used for monitoring the running conditions of the reverse connection prevention protection module (2) and the reverse flow prevention module (4) and controlling the on-off of the first driving module (6) and the second driving module (7) based on the running conditions of the reverse connection prevention protection module (2) and the reverse flow prevention module (4), and the MCU module (8) is respectively connected with the first driving module (6), the second driving module (7), the reverse connection prevention protection module (2) and the reverse flow prevention module (4);
and a second power supply (13) for supplying power to the MCU module (8), the second power supply (13) being connected to the MCU module (8).
2. The input power supply protection circuit of claim 1, wherein: the transient overvoltage protection module (1) comprises a TVS diode D1, a capacitor C1, a fuse F1 and a fuse F2;
one end of the TVS diode D1 is grounded after passing through the fuse F1;
one end of the capacitor C1 is grounded through the fuse F2.
3. The input power supply protection circuit of claim 1, wherein: the reverse connection prevention protection module (2) comprises a resistor R1, a double-path zener diode Q1 and an N-channel field effect transistor Q2;
the connection point of the 1 pin of the two-way zener diode Q1 and one end of the resistor R1 is connected with the grid electrode of the N-channel field effect transistor Q2, the source electrode of the N-channel field effect transistor Q2 is connected with the connection point of the 2 pin of the two-way zener diode Q1 and the other end of the resistor R1, and the drain electrode of the N-channel field effect transistor Q2 is connected with the output end of the transient overvoltage protection module (1).
4. The input power supply protection circuit of claim 1, wherein: the redundancy detection module (3) comprises an NPN triode Q3, a resistor R2, a resistor R3 and a diode D2;
the base electrode of the NPN triode Q3 is connected with a connecting point of one end of a resistor R2 and one end of a resistor R3, the other end of the resistor R2 is grounded, the connecting point of the other end of the resistor R3 and the emitter electrode of the NPN triode Q3 is connected with the positive electrode of a diode D2, and the negative electrode of the diode D2 is connected with an anti-reverse connection protection module (2) and an anti-reverse flow module (4) respectively.
5. The input power supply protection circuit of claim 1, wherein: the backflow prevention module (4) comprises a resistor R4, a double-path zener diode Q4 and an N-channel field effect transistor Q5;
the connection point of the 2 pin of the two-way zener diode Q4 and one end of the resistor R4 is connected with the connection point of the grid electrode of the N-channel field effect transistor Q5 and the redundancy detection module (3), the connection point of the 1 pin of the two-way zener diode Q4 and the other end of the resistor R4 is connected with the source electrode of the N-channel field effect transistor Q5, and the drain electrode of the N-channel field effect transistor Q5 is connected with the MCU_BAT1_AD2 pin of the MCU module (8).
6. The input power supply protection circuit of claim 1, wherein: the filtering module (5) comprises a capacitor C2, a capacitor C3, an inductor L1, a fuse F3 and a fuse F4;
one end of the capacitor C2 is connected with one end of the capacitor C3 through the inductor L1 to form a pi-shaped filter, the other end of the capacitor C2 is grounded after passing through the fuse F3, and the other end of the capacitor C3 is grounded after passing through the fuse F4.
7. The input power supply protection circuit of claim 1, wherein: the first driving module (6) comprises a composite band-stop triode Q6, a resistor R5 and a capacitor C4,
the 1 pin of the composite band-stop triode Q6 is connected with GND, the 2 pin of the composite band-stop triode Q6 is connected with the MCU_CTRL1 pin of the MCU module (8), the 6 pin and the 5 pin of the composite band-stop triode Q6 are respectively connected with two ends of the resistor R5 in a one-to-one correspondence manner, and the 3 pin of the composite band-stop triode Q6 is connected with the first boost module (10) through a connection point of the capacitor C4 and the 4 pin of the composite band-stop triode Q6;
the second driving module (7) comprises a composite band-stop triode Q7, a resistor R6, a resistor R7 and a capacitor C5,
GND is connected to 1 foot of compound band elimination triode Q7, and 2 feet of compound band elimination triode Q7 are connected with MCU_CTRL2 feet of MCU module (8), 6 feet and 5 feet of compound band elimination triode Q7 are connected with resistance R6's both ends one-to-one respectively, resistance R7 and electric capacity C5's one end are connected respectively to compound band elimination triode Q7's 3 feet, compound band elimination triode Q7's 4 feet and electric capacity C5's the tie point of the other end connects second boost module (11).
8. The input power supply protection circuit according to any one of claims 1 to 7, wherein: the power supply system further comprises an operation module (9), wherein the operation module (9) is a common-cathode double-diode D3, a 2 pin of the common-cathode double-diode D3 is connected with the first driving module (6), and a 1 pin of the common-cathode double-diode D3 is connected with the first boosting module (10).
9. A brake controller, characterized by: an input power supply protection circuit comprising any one of claims 1-8.
10. An automobile, characterized in that: a brake controller comprising the brake controller of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321582084.5U CN219918419U (en) | 2023-06-20 | 2023-06-20 | Input power supply protection circuit, brake controller and automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321582084.5U CN219918419U (en) | 2023-06-20 | 2023-06-20 | Input power supply protection circuit, brake controller and automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219918419U true CN219918419U (en) | 2023-10-27 |
Family
ID=88437872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321582084.5U Active CN219918419U (en) | 2023-06-20 | 2023-06-20 | Input power supply protection circuit, brake controller and automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219918419U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119182110A (en) * | 2024-11-26 | 2024-12-24 | 天津德星智能科技有限公司 | High-side switch anti-reverse circuit and EPS controller based on pre-driver chip |
-
2023
- 2023-06-20 CN CN202321582084.5U patent/CN219918419U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119182110A (en) * | 2024-11-26 | 2024-12-24 | 天津德星智能科技有限公司 | High-side switch anti-reverse circuit and EPS controller based on pre-driver chip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018076794A1 (en) | Redundant backup control circuit of battery management system | |
| CN107845998B (en) | Input power supply health detection and management circuit in power supply parallel redundancy system | |
| CN219918419U (en) | Input power supply protection circuit, brake controller and automobile | |
| CN209994110U (en) | NMOS tube-based reverse connection prevention protection circuit for vehicle-mounted direct-current power supply | |
| CN216056327U (en) | Direct current transient voltage protection circuit | |
| WO2023004952A1 (en) | Vehicle-mounted power supply circuit, and vehicle | |
| CN201113376Y (en) | Direct-current power supply and electronic equipment possessing the direct-current power supply | |
| CN115882580A (en) | Power supply switching system and dual-power supply equipment | |
| CN112039028A (en) | Remote control instruction and bus under-voltage protection circuit with strong anti-jamming capability | |
| CN218997694U (en) | Reverse connection preventing system, vehicle braking system and vehicle | |
| CN112994441B (en) | Vehicle-mounted ECU power supply input circuit | |
| CN215817532U (en) | Airplane power supply protection circuit | |
| CN112531671B (en) | Protection circuit for DC power supply surge and power-off | |
| CN209250234U (en) | Protective circuit | |
| CN115603720A (en) | High-reliability reverse connection prevention circuit suitable for redundant double controllers | |
| CN115776103A (en) | Low-power-consumption input reverse connection prevention function control circuit | |
| CN220368604U (en) | Redundant circuit based on ideal diode | |
| CN221263367U (en) | Direct-current 110V power supply surge suppression device for vehicle-mounted VOBC (volatile organic Compounds) equipment | |
| CN208589779U (en) | Peak voltage protection circuit | |
| CN113422361B (en) | Input reverse connection preventing circuit for vehicle | |
| CN212909338U (en) | Power supply redundancy circuit | |
| CN218829070U (en) | Overvoltage protection circuit with redundancy design | |
| CN115140008B (en) | Vehicle braking system control device | |
| CN217445249U (en) | Power protection circuit and electronic equipment | |
| CN221125812U (en) | Relay driving circuit and device thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |