CN109515350B - Protective circuit - Google Patents
Protective circuit Download PDFInfo
- Publication number
- CN109515350B CN109515350B CN201811347996.8A CN201811347996A CN109515350B CN 109515350 B CN109515350 B CN 109515350B CN 201811347996 A CN201811347996 A CN 201811347996A CN 109515350 B CN109515350 B CN 109515350B
- Authority
- CN
- China
- Prior art keywords
- resistor
- power supply
- circuit
- chip
- branch
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a protection circuit, which comprises an ACC voltage input detection branch circuit, a voltage output detection branch circuit and a control circuit, wherein the ACC voltage input detection branch circuit is used for outputting a corresponding level signal to a central processing unit according to the ACC voltage input condition of an ACC voltage input port so that the central processing unit controls a controlled power supply to output a corresponding voltage according to the level signal; the charging branch circuit is used for outputting a high level to the main power supply control branch circuit of the system after being charged by the fixed power supply; and the system main power control branch is used for outputting a corresponding control signal to the system main power according to the voltage output by the controlled power and the high level output by the charging branch so as to control the running state of the system main power. The protection circuit can ensure that the standby current reaches the standard under normal and abnormal conditions of the vehicle machine system.
Description
Technical Field
The invention relates to the field of automobile multimedia information entertainment systems, in particular to a protection circuit.
Background
The automobile multimedia information system is commonly called as a vehicle machine system. The standby current, i.e. the dark current, is an important performance index in the car machine system, and is related to the normal operation of the car. After the ACC power supply of the automobile is turned off, the standby current of the automobile machine system is less than 10mA, so that the hidden dangers that the automobile cannot be normally started due to serious automobile battery consumption and the like are avoided. In order to ensure that the standby current can reach the specification standard, that is, the standby current is less than 10mA, a currently common technical means is to control the standby current through related software, however, in the case of an abnormal vehicle system, the software design cannot effectively implement the control, so that the size of the standby current cannot be ensured to be controlled within 10 mA.
Therefore, how to design a pure hardware circuit, no matter whether the car machine system is normal or not, it is a technical problem to be solved urgently by those skilled in the art that the standby current can be guaranteed to reach the standard.
Disclosure of Invention
The invention aims to provide a protection circuit which can ensure that the standby current reaches the standard no matter whether a vehicle machine system is normal or not.
In order to solve the above technical problem, the present invention provides an automatic shutdown protection circuit, including:
the system comprises an ACC voltage input detection branch, a charging branch and a system main power control branch; the ACC voltage input detection branch is respectively connected with the ACC voltage input port, the fixed power supply, the central processing unit and the charging branch; the charging branch circuit is respectively connected with the fixed power supply, the ACC voltage input detection branch circuit and the system main power supply control branch circuit; the system main power supply control branch is respectively connected with the fixed power supply, the charging branch, the controlled power supply and the system main power supply;
the ACC voltage input detection branch is used for outputting a corresponding level signal to the central processing unit according to the ACC voltage input condition of the ACC voltage input port, so that the central processing unit controls the controlled power supply to output a corresponding voltage according to the level signal;
the charging branch is used for outputting a high level to the system main power supply control branch after being charged by the fixed power supply;
and the system main power supply control branch circuit is used for outputting a corresponding control signal to the system main power supply according to the voltage output by the controlled power supply and the high level output by the charging branch circuit so as to control the running state of the system main power supply.
Optionally, the ACC voltage input detection branch includes:
the circuit comprises a first triode, a first resistor, a second resistor and a third resistor; the base electrode of the first triode is connected with the ACC voltage input port and one end of the first resistor, and the other end of the first resistor is connected with the fixed power supply and a first common end formed by connecting the second resistor and the third resistor in parallel; and the collector of the first triode is connected with the second common end of the second resistor and the third resistor after being connected in parallel and the central processing unit, and the emitter of the first triode is grounded.
Optionally, the charging branch includes:
the circuit comprises a fourth resistor, a fifth resistor, a first diode and a preset number of capacitors; the capacitors with the preset number are connected in parallel, a first common end is connected with one end of the fourth resistor and the anode of the first diode, and a second common end is grounded; the other end of the fourth resistor is connected with the fixed power supply, the cathode of the first diode is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the collector of the first triode.
Optionally, the number of the capacitors is specifically five.
Optionally, the system main power control circuit includes:
the circuit comprises a second diode, a third diode, a sixth resistor, a seventh resistor, an eighth resistor, a second triode and a single-path two-input positive AND gate chip; the anode of the second diode is connected with the controlled power supply, and the cathode of the second diode is connected with the first input pin of the one-way two-input positive AND gate chip, one end of the sixth resistor and the cathode of the third diode; the other end of the sixth resistor is grounded; a second input pin of the single-path two-input positive AND gate chip is connected with an anode of the first diode, a power supply pin of the single-path two-input positive AND gate chip is connected with the fixed power supply, an output pin of the single-path two-input positive AND gate chip is connected with a base electrode of the second triode and an anode of the third diode, a collector electrode of the second triode is connected with an enabling pin of the system main power supply, one end of the seventh resistor and one end of the eighth resistor, and an emitter electrode of the second triode is grounded; the other end of the seventh resistor is connected with a power supply pin of the single-path two-input positive AND gate chip, and the other end of the eighth resistor is grounded.
Optionally, the system main power control circuit further includes:
and the input pin of the reset chip is connected with the output pin of the single-path two-input positive AND gate chip, and the output pin of the reset chip is connected with the base electrode of the second triode.
Optionally, each resistor in the protection circuit is a chip resistor, each diode is a chip diode, each capacitor is a chip capacitor, and each triode is a chip triode.
Optionally, the single-path two-input positive and gate chip is specifically a 74LVC1G type chip.
Optionally, the reset chip is specifically a G690L29 type chip.
The protection circuit provided by the invention comprises an ACC voltage input detection branch circuit, a charging branch circuit and a system main power supply control branch circuit; the ACC voltage input detection branch is respectively connected with the ACC voltage input port, the fixed power supply, the central processing unit and the charging branch; the charging branch circuit is respectively connected with the fixed power supply, the ACC voltage input detection branch circuit and the system main power supply control branch circuit; the system main power supply control branch is respectively connected with the fixed power supply, the charging branch, the controlled power supply and the system main power supply; the ACC voltage input detection branch is used for outputting a corresponding level signal to the central processing unit according to the ACC voltage input condition of the ACC voltage input port, so that the central processing unit controls the controlled power supply to output a corresponding voltage according to the level signal; the charging branch is used for outputting a high level to the system main power supply control branch after being charged by the fixed power supply; and the system main power supply control branch circuit is used for outputting a corresponding control signal to the system main power supply according to the voltage output by the controlled power supply and the high level output by the charging branch circuit so as to control the running state of the system main power supply.
Compared with the traditional technical scheme of standby current control through software design, the protection circuit provided by the invention can detect whether the ACC voltage input port has ACC voltage input by using the ACC voltage input detection branch circuit, so that the central processing unit can know the current state of the vehicle and control the controlled power supply to output corresponding voltage; and outputting a corresponding control signal to the system main power supply through the system main power supply control branch according to the voltage output by the controlled power supply and the high level output by the charging branch so as to control the off state of the system main power supply and further control the standby current to reach the specification standard. The protection circuit breaks through the limitation that the standby current can be controlled to reach the standard only when the locomotive system is normal by traditional software, and the protection circuit can ensure that the standby current reaches the standard no matter whether the locomotive system is normal or not.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another protection circuit according to an embodiment of the invention.
Detailed Description
The core of the invention is to provide a protection circuit which can ensure that the standby current reaches the standard no matter whether a vehicle machine system is normal or not.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a protection circuit according to an embodiment of the invention; as can be seen with reference to fig. 1, the protection circuit may include:
the system comprises an ACC voltage input detection branch circuit 10, a charging branch circuit 20 and a system main power supply control branch circuit 30;
specifically, the ACC voltage input detection branch 10 is connected to the ACC voltage input port, the stationary power supply, the central processing unit, and the charging branch 20, respectively; so-called fixed power supplies, i.e. uncontrolled power supplies, such as: the voltage value of the automobile battery is fixed and can be converted into 3.3V.
The ACC voltage input detection branch 10 is used for outputting a corresponding level signal to the cpu according to the ACC voltage input condition at the ACC voltage input port, so that the cpu controls the controlled power supply to output a corresponding voltage according to the level signal. Specifically, when an ACC voltage is input at the ACC voltage input port, the ACC voltage is input to the corresponding output low level of the detection branch 10; in contrast, when there is no ACC voltage input at the ACC voltage input port, the ACC voltage input detection branch 10 outputs a high level accordingly. Therefore, the central processing unit can know whether the current state of the vehicle is in a standby state or not according to the level of the received level signal and control the controlled power supply to output corresponding voltage, if the ACC voltage is input at the ACC voltage input port, the output voltage of the controlled power supply is 3.3V, and if the ACC voltage is not input at the ACC voltage input port, the output voltage of the controlled power supply is 0V. Of course, the corresponding relationship between the ACC voltage input at the ACC voltage input port and the output voltage of the controlled power supply is the corresponding relationship in the normal condition of the vehicle system, and when the vehicle system is abnormal, even if no ACC voltage is input at the ACC voltage input port, the output voltage of the controlled power supply is still 3.3V.
Referring to fig. 2, in an embodiment, the ACC voltage input detecting branch 10 may include: a first triode Q1, a first resistor R1, a second resistor R2 and a third resistor R3; the base electrode of the first triode Q1 is connected with an ACC voltage input port and one end of a first resistor R1, the other end of the first resistor R1 is connected with a fixed power supply, and a first common end of the second resistor R2 and a third resistor R3 which are connected in parallel is connected; the collector of the first triode Q1 is connected with the second common end of the second resistor R2 and the third resistor R3 after being connected in parallel and the central processing unit, and the emitter of the first triode Q1 is grounded.
Corresponding to the above circuit configuration, the ACC voltage input detection branch 10 performs the above operation as follows: when an ACC voltage is input at the ACC voltage input port, the first transistor Q1 is turned on, the level of the first common terminal of the second resistor R2 and the third resistor R3 is low, and then the ACC voltage input detection branch 10 outputs a low level to the cpu through the first common terminal; when no ACC voltage is input into the ACC voltage input port, the first transistor Q1 is turned off, the level of the first common node of the second resistor R2 and the third resistor R3 changes from low to high, and the ACC voltage input detection branch 10 outputs a high level to the cpu through the first common node.
The charging branch 20 is respectively connected with the fixed power supply, the ACC voltage input detection branch 10 and the system main power supply control branch 30; and the high-level input circuit is responsible for outputting a high level to the system main power control branch 30 after charging through the fixed power supply, and continuously providing a high-level input for the system main power control branch 30.
Referring to fig. 2, in a specific real-time manner, the charging branch 20 may include: a fourth resistor R4, a fifth resistor R5, a first diode D1 and a preset number of capacitors C; the capacitors C with preset number are connected in parallel, the first common end is connected with one end of the fourth resistor R4 and the anode of the first diode D1, and the second common end is grounded; the other end of the fourth resistor R4 is connected to a fixed power supply, the cathode of the first diode D1 is connected to one end of a fifth resistor R5, and the other end of the fifth resistor R5 is connected to the collector of the first transistor Q1.
Based on the above circuit structure, the charging branch 20 performs the following operations: under the action of unidirectional conduction and isolation of the first diode, the fixed power supply charges the capacitors C connected in parallel through the fourth resistor R4, so that a first common end of the capacitors C generates high potential, and the high potential is further led out to the system main power supply control branch circuit 30, thereby achieving the purpose of outputting high level to the system main power supply control branch circuit 30. The charging time for the fixed power supply to charge the capacitors C connected in parallel through the fourth resistor R4 corresponds to the number of the capacitors C in the charging circuit and the capacitance of each capacitor C. The appropriate number of capacitors and capacitance values can be set in combination with the actual application requirements for the charging duration. The invention is not limited uniquely, and can be set differently according to actual needs.
In a specific embodiment, the number of the capacitors C in the charging branch 20 is five.
Specifically, in this embodiment, the number of the capacitors C in the charging branch 20 is specifically set to five, and when the capacitance values of the capacitors C are all 47uF, the capacitance value after the parallel connection of the five capacitors C of 47uF is equivalent to 235uF, and the charging length is about 120 s.
The system main power control branch 30 is respectively connected with the fixed power supply, the charging branch 20, the system main power supply and the controlled power supply; the method is mainly used for outputting a corresponding control signal to the system main power supply according to the output voltage output by the controlled power supply and the high level output by the charging branch circuit 20 so as to control the running state of the system main power supply.
Referring also to fig. 2, in a specific embodiment, optionally, the system main power control branch 30 includes:
the circuit comprises a second diode D2, a third diode D3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second triode Q2 and a single-path two-input positive AND gate chip; the anode of the second diode D2 is connected with a controlled power supply, and the cathode of the second diode D2 is connected with the first input pin of the one-way two-input positive AND gate chip, one end of the sixth resistor R6 and the cathode of the third diode D3; the other end of the sixth resistor R6 is grounded; a second input pin of the single-path two-input positive AND gate chip is connected with an anode of a first diode D1, a power supply pin of the single-path two-input positive AND gate chip is connected with a fixed power supply, an output pin of the single-path two-input positive AND gate chip is connected with a base of a second triode Q2 and an anode of a third diode D3, a collector of the second triode Q2 is connected with an enabling pin of a system main power supply, one end of a seventh resistor R7 and one end of an eighth resistor R8, and an emitter of the second triode Q2 is grounded; the other end of the seventh resistor R7 is connected with the power supply pin of the one-way two-input positive AND gate chip, and the other end of the eighth resistor R8 is grounded.
Based on the circuit structure, the main power control circuit of the system implements the following operation processes: when the ACC voltage input port is not input with voltage, the output voltage output by the controlled power supply is 0V, then the first input pin of the single-path two-input positive and gate chip inputs low level, meanwhile, after the charging branch 20 finishes charging, the second input pin of the single-path two-input positive and gate chip continuously inputs high level, then the output pin of the single-path two-input positive and gate chip outputs low level, the standby current is less than 10mA, the second triode Q2 is not conducted, the input level of the enable pin of the system main power supply connected with the second triode Q2 is high level, and the system main power supply is not closed. When the voltage is not input into the ACC voltage input port in an abnormal condition, the output voltage correspondingly output by the controlled power supply is 3.3V, then the first input pin of the single-path two-input positive AND gate chip inputs a high level, and the second input pin of the single-path two-input positive AND gate chip inputs a high level, so that the output pin of the single-path two-input positive AND gate chip outputs a high level, at this time, the second triode Q2 is conducted, the input level of the enabling pin of the system main power supply connected with the second triode Q2 is a low level, the system main power supply is closed, and the standby current is still less than 10 mA. Therefore, the standby current is still ensured to reach the standard when the vehicle machine system fails.
The invention also does not have unique limitation on the type of the single-path two-input positive AND gate chip, and can be adaptively set according to actual requirements.
Optionally, the single-path two-input positive and gate chip is a 74LVC1G type chip.
Specifically, in this embodiment, the one-way two-input positive and gate chip is specifically selected to be a 74LVC1G type chip, and the 74LVC1G type chip is further used to implement the above functions.
In summary, the protection circuit provided by the present invention utilizes the ACC voltage input detection branch to detect whether the ACC voltage is input to the ACC voltage input port, so that the central processing unit can know the current state of the vehicle and control the controlled power supply to output the corresponding voltage; and outputting a corresponding control signal to the system main power supply through the system main power supply control branch according to the voltage output by the controlled power supply and the high level output by the charging branch so as to control the off state of the system main power supply and further control the standby current to reach the specification standard. The protection circuit breaks through the limitation that the standby current can be controlled to reach the standard only when the locomotive system is normal by traditional software, and the protection circuit can ensure that the standby current reaches the standard no matter whether the locomotive system is normal or not.
On the basis of the above embodiment, optionally, the system main power control branch 30 may further include: and the input pin of the reset chip is connected with the output pin of the single-path two-input positive AND gate chip, and the output pin of the reset chip is connected with the base electrode of the second triode Q2.
Specifically, referring to fig. 3, fig. 3 is a schematic diagram of another protection circuit according to an embodiment of the present invention, and referring to fig. 3, in order to make the switch of the second transistor Q2 more stable and reliable, in this embodiment, the system main power control circuit further includes a reset chip, and when the voltage input by the input pin of the reset chip is greater than the threshold value of the reset chip, for example, greater than 2.93V, the output pin outputs a low level of about 140ms and then outputs a high level, so that the second transistor Q2 is turned on. The type of the reset chip is not limited uniquely, and the reset chip can be set according to actual needs.
Optionally, the reset chip is a G690L29 type chip.
Specifically, the reset chip may be a G690L29 type chip, and the operation is realized by the G690L29 type chip.
On the basis of the above embodiments, optionally, each resistor in the protection circuit is a chip resistor, each diode is a chip diode, each capacitor C is a chip capacitor C, and each triode is a chip triode.
Specifically, in order to save circuit space and improve the performance of the circuit against interference, in this embodiment, the resistors in the protection circuit, i.e., the first resistor R1, the second resistor R2, and the like, all use chip resistors. The first diode D1 pipe, the second diode D2 and the third diode D3 are all patch diodes, each capacitor C is a patch capacitor, and the first triode Q1 and the second triode Q2 are patch triodes.
Further, the specification of each chip resistor may specifically be: the first resistor R1 and the sixth resistor R6 are 0402 resistors with the resistance value of 10 kilo-ohm, the resistance value error precision of +/-1 percent and the power of 1/16 watts; the second resistor R2 and the third resistor R3 are both 0402 type resistors with the resistance value of 1.5 kilo-ohm, the accuracy of the resistance value error of +/-5 percent and the power of 1/16 watts; the fourth resistor R4 and the eighth resistor R8 are 0402 resistors with the resistance value of 1 megaohm, the resistance value error precision of +/-5 percent and the power of 1/16 watts; the fifth resistor R5 is a 0805 type resistor with the resistance value of 220 ohms, the resistance error precision of +/-5 percent and the power of 1/8 watts; the seventh resistor R7 is a 0402 type resistor with 47 kilo-ohm resistance value, resistance value error accuracy of +/-1% and power of 1/16 watts.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The protection circuit provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It is further noted that, in the present specification, relational terms such as first and second, and the like are 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.
Claims (9)
1. A protection circuit, comprising: the system comprises an ACC voltage input detection branch, a charging branch and a system main power control branch; the ACC voltage input detection branch is respectively connected with the ACC voltage input port, the fixed power supply, the central processing unit and the charging branch; the charging branch circuit is respectively connected with the fixed power supply, the ACC voltage input detection branch circuit and the system main power supply control branch circuit; the system main power supply control branch is respectively connected with the fixed power supply, the charging branch, the controlled power supply and the system main power supply;
the ACC voltage input detection branch is used for outputting a corresponding level signal to the central processing unit according to the ACC voltage input condition of the ACC voltage input port, so that the central processing unit controls the controlled power supply to output a corresponding voltage according to the level signal;
the charging branch is used for outputting a high level to the system main power supply control branch after being charged by the fixed power supply;
and the system main power supply control branch circuit is used for outputting a corresponding control signal to the system main power supply according to the voltage output by the controlled power supply and the high level output by the charging branch circuit so as to control the running state of the system main power supply.
2. The protection circuit of claim 1, wherein the ACC voltage input detection branch comprises:
the circuit comprises a first triode, a first resistor, a second resistor and a third resistor; the base electrode of the first triode is connected with the ACC voltage input port and one end of the first resistor, and the other end of the first resistor is connected with the fixed power supply and a first common end formed by connecting the second resistor and the third resistor in parallel; and the collector of the first triode is connected with the second common end of the second resistor and the third resistor after being connected in parallel and the central processing unit, and the emitter of the first triode is grounded.
3. The protection circuit of claim 2, wherein the charging branch comprises:
the circuit comprises a fourth resistor, a fifth resistor, a first diode and a preset number of capacitors; the capacitors with the preset number are connected in parallel, a first common end is connected with one end of the fourth resistor and the anode of the first diode, and a second common end is grounded; the other end of the fourth resistor is connected with the fixed power supply, the cathode of the first diode is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the collector of the first triode.
4. Protection circuit according to claim 3, characterized in that the number of capacitors is in particular five.
5. The protection circuit of claim 4, wherein the system main power control circuit comprises:
the circuit comprises a second diode, a third diode, a sixth resistor, a seventh resistor, an eighth resistor, a second triode and a single-path two-input positive AND gate chip; the anode of the second diode is connected with the controlled power supply, and the cathode of the second diode is connected with the first input pin of the one-way two-input positive AND gate chip, one end of the sixth resistor and the cathode of the third diode; the other end of the sixth resistor is grounded; a second input pin of the single-path two-input positive AND gate chip is connected with an anode of the first diode, a power supply pin of the single-path two-input positive AND gate chip is connected with the fixed power supply, an output pin of the single-path two-input positive AND gate chip is connected with a base electrode of the second triode and an anode of the third diode, a collector electrode of the second triode is connected with an enabling pin of the system main power supply, one end of the seventh resistor and one end of the eighth resistor, and an emitter electrode of the second triode is grounded; the other end of the seventh resistor is connected with a power supply pin of the single-path two-input positive AND gate chip, and the other end of the eighth resistor is grounded.
6. The protection circuit of claim 5, wherein the system main power control circuit further comprises:
and the input pin of the reset chip is connected with the output pin of the single-path two-input positive AND gate chip, and the output pin of the reset chip is connected with the base electrode of the second triode.
7. The protection circuit of claim 6, wherein each resistor in the protection circuit is a chip resistor, each diode is a chip diode, each capacitor is a chip capacitor, and each transistor is a chip transistor.
8. The protection circuit of claim 7, wherein the single-circuit two-input positive and gate chip is a 74LVC1G type chip.
9. The protection circuit according to claim 8, characterized in that the reset chip is in particular a G690L29 type chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811347996.8A CN109515350B (en) | 2018-11-13 | 2018-11-13 | Protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811347996.8A CN109515350B (en) | 2018-11-13 | 2018-11-13 | Protective circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109515350A CN109515350A (en) | 2019-03-26 |
| CN109515350B true CN109515350B (en) | 2021-09-24 |
Family
ID=65776115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811347996.8A Active CN109515350B (en) | 2018-11-13 | 2018-11-13 | Protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109515350B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001322512A (en) * | 2000-05-11 | 2001-11-20 | Matsushita Electric Ind Co Ltd | Vehicular dark current reducing method and device |
| CN203078446U (en) * | 2012-12-21 | 2013-07-24 | 上海大郡动力控制技术有限公司 | Control circuit of low quiescent currents of motor control system for vehicle |
| CN203305938U (en) * | 2013-06-07 | 2013-11-27 | 北汽福田汽车股份有限公司 | Control device of vehicle quiescent current |
| CN103517831A (en) * | 2011-05-12 | 2014-01-15 | 日产自动车株式会社 | Dark current cutoff device and dark current cutoff method |
| CN206365090U (en) * | 2016-12-30 | 2017-07-28 | 上海小糸车灯有限公司 | It is a kind of to reduce the LED failure breaking circuit of quiescent current |
-
2018
- 2018-11-13 CN CN201811347996.8A patent/CN109515350B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001322512A (en) * | 2000-05-11 | 2001-11-20 | Matsushita Electric Ind Co Ltd | Vehicular dark current reducing method and device |
| CN103517831A (en) * | 2011-05-12 | 2014-01-15 | 日产自动车株式会社 | Dark current cutoff device and dark current cutoff method |
| CN203078446U (en) * | 2012-12-21 | 2013-07-24 | 上海大郡动力控制技术有限公司 | Control circuit of low quiescent currents of motor control system for vehicle |
| CN203305938U (en) * | 2013-06-07 | 2013-11-27 | 北汽福田汽车股份有限公司 | Control device of vehicle quiescent current |
| CN206365090U (en) * | 2016-12-30 | 2017-07-28 | 上海小糸车灯有限公司 | It is a kind of to reduce the LED failure breaking circuit of quiescent current |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109515350A (en) | 2019-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9240697B2 (en) | Charging circuit and method for preventing charging power supply from reversely connecting | |
| CN110774907B (en) | Detection and single wake-up circuit for charging CC signal | |
| US8692593B1 (en) | Zero or ultra-low DC current consumption power-on and brown-out detector | |
| US20130328405A1 (en) | Ground test circuit | |
| CN109515350B (en) | Protective circuit | |
| US20200144855A1 (en) | Automatic Power Switching System and Electronic Device Capable of Switching Power Supply | |
| CN108983940B (en) | Double-control storage power-down protection system | |
| US10069312B2 (en) | Charging discharging apparatus for super capacitor modules | |
| CN210575116U (en) | Solid state disk and reset circuit thereof | |
| CN107276037B (en) | Vehicle-mounted USB power interface protection circuit | |
| CN208818364U (en) | Temperature measuring circuit | |
| CN106033964B (en) | Button triggers detection device and has its domestic appliance among domestic appliance | |
| CN206850404U (en) | A kind of line under-voltage protection circuit with the input of retarding window wide scope | |
| US20160344179A1 (en) | Inrush current protection circuit | |
| CN108955930A (en) | temperature measuring circuit | |
| CN105182833A (en) | Double-power-supply power supply and power-off sequential control device and method | |
| CN206060277U (en) | A kind of battery management system with defencive function | |
| CN112117740B (en) | Under-voltage protection trigger circuit, under-voltage protection device and power supply system | |
| CN205015670U (en) | Dual power supply and outage time schedule control device | |
| CN109100564B (en) | Signal fluctuation detection circuit | |
| CN207148219U (en) | A kind of resistance detecting circuit of anti-reverse, anti-temperature drift | |
| CN208062858U (en) | A kind of electric power management circuit for hand-held equipment | |
| JP7462686B2 (en) | Instantaneous voltage drop detection circuit and on-board diagnostic system | |
| CN105717433B (en) | The insulation detecting circuit and insulation detecting method of power battery | |
| CN216873187U (en) | Universal input interface circuit and control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |