CN113765048A - Circuit and system for ensuring input voltage of secondary power supply based on central control ground offset voltage - Google Patents

Circuit and system for ensuring input voltage of secondary power supply based on central control ground offset voltage Download PDF

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CN113765048A
CN113765048A CN202110853754.1A CN202110853754A CN113765048A CN 113765048 A CN113765048 A CN 113765048A CN 202110853754 A CN202110853754 A CN 202110853754A CN 113765048 A CN113765048 A CN 113765048A
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voltage
power supply
single chip
chip microcomputer
voltage detection
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CN113765048B (en
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胡勇
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Huizhou Desay SV Automotive Co Ltd
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Huizhou Desay SV Automotive Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • 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
    • B60R16/03—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 for supply of electrical power to vehicle subsystems or for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1203—Circuits independent of the type of conversion

Abstract

The invention relates to the technical field of secondary power supply voltage stabilization input, in particular to a circuit and a system for ensuring secondary power supply input voltage based on central control ground offset voltage, wherein the circuit comprises a singlechip; bases of a triode Q1 and a triode Q2 are respectively connected with a first output end and a second output end of the single chip microcomputer, a collector is connected with a power end of the single chip microcomputer and outputs a first voltage detection end and a second voltage detection end in parallel, and an emitter is respectively connected with a negative polarity end and a central control zero potential point of the automobile battery; the first voltage detection end and the second voltage detection end are connected into the single chip microcomputer, and the third output end of the single chip microcomputer controls and conducts the secondary power supply chip. The invention solves the problems that the existing vehicle-mounted product is electrically connected only through a cable of the whole vehicle, the voltage difference between the grounding end of the vehicle-mounted product and the negative polarity end of a battery is large due to the impedance of the cable, and a secondary power supply chip is easy to cause the input voltage to exceed the normal input range due to overlarge ground offset voltage, so that the chip is damaged finally.

Description

Circuit and system for ensuring input voltage of secondary power supply based on central control ground offset voltage
Technical Field
The invention relates to the technical field of voltage stabilization input of a secondary power supply, in particular to a circuit and a system for ensuring input voltage of the secondary power supply based on central control ground offset voltage.
Background
At present, the whole vehicle system becomes increasingly complex, the number of vehicle-mounted electronic components is increasing, and the loop path of power input of some vehicle-mounted electronic components is lengthened while the overall layout of the vehicle-mounted electronic components is met. As the input power supply loop path of the vehicle-mounted electronic component is lengthened, the GND voltage of the vehicle-mounted product has a certain voltage difference with the GND voltages of a battery system and other electronic components in the vehicle. A power circuit path block diagram of a wearable central control product shown in figure 1 in the attached drawing of the specification.
The vehicle-mounted product is electrically connected only through a cable of the whole vehicle, the voltage difference between the grounding end of the vehicle-mounted product and the negative polarity end of the battery is large due to certain impedance of the cable, and the input voltage exceeds the normal input range due to excessive ground offset voltage of the secondary power supply chip, so that the chip is damaged finally.
Therefore, a circuit and system for guaranteeing the input voltage of the secondary power supply based on the central control ground offset voltage is developed.
Disclosure of Invention
The invention provides a circuit and a system for ensuring input voltage of a secondary power supply based on central control ground offset voltage, and mainly solves the problems that the existing vehicle-mounted product is only electrically connected through a cable of a whole vehicle, the voltage difference between the grounding end of the vehicle-mounted product and the negative polarity end of a battery is large due to the impedance of the cable, and a chip of the secondary power supply is easy to cause the input voltage to exceed the normal input range due to excessive ground offset voltage, so that the chip is damaged finally.
The invention provides a circuit for ensuring the input voltage of a secondary power supply based on a central control ground offset voltage, which comprises a singlechip; bases of a triode Q1 and a triode Q2 are respectively connected with a first output end and a second output end of the single chip microcomputer, a collector is connected with a power supply end of the single chip microcomputer and outputs a first voltage detection end and a second voltage detection end in parallel, and an emitter is respectively connected with a negative polarity end and a central control zero potential point of the automobile battery; the first voltage detection end and the second voltage detection end are connected to the single chip microcomputer, and a third output end of the single chip microcomputer controls and conducts the secondary power supply chip;
when the first output end and the second output end of the single chip microcomputer output high levels, a pressure difference exists between the first voltage detection end and the second voltage detection end, the single chip microcomputer judges whether the pressure difference is larger than a preset value or not, if yes, the third output end is controlled to output low levels, and otherwise, the high levels are output.
Preferably, the collectors of the transistor Q1 and the transistor Q2 are respectively connected in series with resistors R5, R6, R7 and R8 and then connected to the power supply terminal of the single chip, and the first voltage detection terminal and the second voltage detection terminal are connected in parallel between the resistors R5, R6, the resistors R7 and the resistors R8; the resistance of the resistor R5 is equal to that of the resistor R6, and the resistance of the resistor R7 is equal to that of the resistor R8.
Preferably, when the first output end and the second output end of the single chip microcomputer output low levels, the voltage values of the first voltage detection end and the second voltage detection end are equal to the voltage value of the power supply end of the single chip microcomputer; when the first output end and the second output end output high levels, the voltage values of the first voltage detection end and the second voltage detection end are respectively equal to half of the sum of the voltage value of the power end of the single chip microcomputer and the voltage value of the negative polarity end of the automobile battery, and half of the sum of the voltage value of the power end of the single chip microcomputer and the voltage value of the central control zero potential point.
Preferably, the third output end of the single chip microcomputer is connected with the base of a triode Q4, the collector of the triode Q4 is connected with the secondary power supply chip through a MOS transistor Q3, and the emitter of the triode Q4 is grounded.
Preferably, the MOS tube is a P-channel type MOS tube; the G pole of the MOS tube is connected with the collector of the triode Q4, the D pole is connected with the input voltage, and the S pole is connected with the secondary power supply chip.
The invention also provides a system for ensuring the input voltage of the secondary power supply based on the central control ground offset voltage, which comprises a singlechip;
the single chip microcomputer is used for detecting the voltage difference between the first voltage detection end and the second voltage detection end when the first output end and the second output end of the single chip microcomputer are at a stable high level; and the power supply to the secondary power supply chip is interrupted when the pressure difference is detected to be greater than a preset value.
Preferably, the single chip microcomputer is configured to detect a voltage difference between the first voltage detection end and the second voltage detection end when detecting that the output level of the self-interrupt output port is a stable high level.
Preferably, the system comprises a timer electrically connected with the single chip microcomputer;
the single chip microcomputer is used for controlling the conduction of the timer when detecting that the pressure difference is respectively greater than a preset value and smaller than the preset value;
the timer is used for calculating the receiving time length of the current control signal; the system is also used for judging whether the receiving time length is greater than a time threshold value, if so, sending a detection termination signal to the singlechip, and if not, continuously timing;
and the singlechip is used for terminating the detection of the voltage difference between the first voltage detection end and the second voltage detection end when receiving the termination detection signal.
From the above, the following beneficial effects can be obtained by applying the technical scheme provided by the invention:
firstly, the circuit provided by the invention has the advantages that the ground offset voltage is obtained, and whether the current voltage can influence the normal working process of the secondary power supply chip is judged based on the detection result of the voltage difference of the detection end, so that the overvoltage damage of the secondary power supply chip is avoided, and meanwhile, the realization mode and the circuit are simpler;
secondly, the system provided by the invention starts to detect the pressure difference at a fixed time when the output voltage is judged to be stable, so that the test error caused by the unstable level is avoided, and the accuracy of the measurement result is ensured;
thirdly, after the result of detecting the pressure difference is judged to be stable, the pressure difference is not detected any more, the excessive occupation of the single chip microcomputer is avoided, and the normal power supply and operation of the electric equipment in the starting process of the automobile are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a circuit diagram of a prior art on-board electrical circuit;
FIG. 2 is a diagram of a detection circuit in the present embodiment 1;
FIG. 3 is a circuit diagram of an input power supply of the secondary power supply chip in this embodiment 1;
fig. 4 is a circuit diagram of ACC detection in the present embodiment 1.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The existing vehicle-mounted product is electrically connected only through a cable of the whole vehicle, the voltage difference between the grounding end of the vehicle-mounted product and the negative polarity end of the battery is large due to the impedance of the cable, and the secondary power supply chip easily causes the input voltage to exceed the normal input range due to the overlarge ground offset voltage, so that the chip is damaged finally.
Example 1
As shown in fig. 2 to 4, in order to solve the above problem, the present embodiment provides a circuit for ensuring the input voltage of a secondary power supply based on a central control ground offset voltage, which mainly includes a single chip; bases of a triode Q1 and a triode Q2 are respectively connected with a first output end and a second output end of the single chip microcomputer, a collector is connected with a power end of the single chip microcomputer and outputs a first voltage detection end and a second voltage detection end in parallel, and an emitter is respectively connected with a negative polarity end and a central control zero potential point of the automobile battery; the first voltage detection end and the second voltage detection end are connected into the single chip microcomputer, and the third output end of the single chip microcomputer controls the secondary power supply chip to be conducted.
When the first output end and the second output end of the single chip microcomputer output high levels, a pressure difference exists between the first voltage detection end and the second voltage detection end, the single chip microcomputer judges whether the pressure difference is larger than a preset value or not, if yes, the third output end is controlled to output low levels, and otherwise, the high levels are output.
Preferably, but not limited to, the first output terminal and the second output terminal are GPIO ports on the single chip microcomputer respectively.
In this embodiment, the level of the first output terminal and the level of the second output terminal control the conduction of the transistor Q1 and the transistor Q2.
In the embodiment, the negative polarity end and the central control zero potential point of the automobile battery are respectively switched through the DUT plug connector.
More specifically, the collectors of the transistor Q1 and the transistor Q2 are respectively connected in series with the resistors R5 and R6, the resistors R7 and the resistors R8 and then connected to the power supply end of the single chip, and the first voltage detection end and the second voltage detection end are input in parallel between the resistors R5 and R6 and the resistors R7 and R8; the resistor R5 has the same resistance as the resistor R6, and the resistor R7 has the same resistance as the resistor R8.
More specifically, when the first output end and the second output end of the single chip microcomputer output low levels, the voltage values of the first voltage detection end and the second voltage detection end are equal to the voltage value of the power supply end of the single chip microcomputer; when the first output end and the second output end output high levels, the voltage values of the first voltage detection end and the second voltage detection end are respectively equal to half of the sum of the voltage value of the power end of the single chip microcomputer and the voltage value of the negative polarity end of the automobile battery, and half of the sum of the voltage value of the power end of the single chip microcomputer and the voltage value of the central control zero potential point.
Preferably, but not limited to, the voltage value of the power supply terminal of the single chip microcomputer is 5V in the embodiment.
In this embodiment, when the first output terminal V is connected to the first output terminalIO1And a second output terminal VIO2When outputting low level, the first voltage detection terminal VAD1And a second voltage detection terminal VAD2Is equal to VMCU-5VWhen V isIO1And VIO2When the high level is outputted, the voltage is outputted,
Figure BDA0003183336010000061
(wherein VbatteryGNDIs the negative polarity terminal of the automobile batteryVoltage value of);
Figure BDA0003183336010000062
(wherein VGNDA point of central control zero potential).
More specifically, the third output end of the single chip microcomputer is connected with the base electrode of the triode Q4, the collector electrode of the triode Q4 is connected with the secondary power supply chip through the MOS transistor Q3, and the emitter electrode of the triode Q4 is grounded.
More specifically, the MOS tube is a P-channel type MOS tube; the G pole of the MOS transistor Q3 is connected with the collector of the triode Q4, the D pole is connected with the input voltage, and the S pole is connected with the secondary power supply chip.
In this embodiment, the layout may be performed according to the circuit diagram shown in fig. 3, that is, the resistor R13, the resistor R14, the resistor R11, the resistor R12, and the filter capacitor C3 are provided to constitute an output power control portion of the PMOS transistor Q3.
Preferably, but not limited to, the specific value in this embodiment may be adjusted according to the input voltage range of the secondary power supply chip, for example, set to 1V, and the power supply is cut off when the voltage difference exceeds 1V.
Preferably, the ACC detection circuit shown in fig. 4 is further provided, wherein a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a voltage regulator tube Z1, an NMOS tube Q5 and an NMOS tube Q6 are provided.
Example 2
In order to solve the foregoing problems, the present embodiment provides a system for guaranteeing an input voltage of a secondary power supply based on a central control ground offset voltage, which includes a single chip; the single chip microcomputer is used for testing the voltage difference between the first voltage detection end and the second voltage detection end when the first output end and the second output end of the single chip microcomputer are at a stable high level; and the power supply to the secondary power supply chip is interrupted when the pressure difference is detected to be greater than a preset value.
More specifically, the single chip microcomputer is used for detecting the voltage difference between the first voltage detection end and the second voltage detection end when detecting that the output level of the self-interrupt output port is a stable high level.
In the embodiment, the voltage is unstable during the ACC ignition, and at this time, the working current is unstable when other wood blocks of the entire vehicle work, so that the low voltage fluctuates, which affects the detection effect.
More specifically, the device also comprises a timer electrically connected with the singlechip; the singlechip is used for controlling the conduction of the timer when the detected pressure difference is respectively greater than a preset value and less than the preset value; the timer is used for calculating the receiving time length of the current control signal; the system is also used for judging whether the receiving time length is greater than a time threshold value, if so, sending a detection termination signal to the single chip microcomputer, and if not, continuously timing; and the singlechip is used for terminating the detection of the voltage difference between the first voltage detection end and the second voltage detection end when receiving the detection termination signal.
In this embodiment, the time-recorder is used for calculating first voltage delivery outlet AD1 and second voltage delivery outlet AD2 after lasting a period of collection data are stable, and the singlechip will close and gather AD mouth, alleviates the pressure of singlechip, avoids the normal operating of excessive pressure influence singlechip.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims (8)

1. A circuit for ensuring the input voltage of a secondary power supply based on a central control ground offset voltage is characterized in that: comprises a singlechip; bases of a triode Q1 and a triode Q2 are respectively connected with a first output end and a second output end of the single chip microcomputer, a collector is connected with a power supply end of the single chip microcomputer and outputs a first voltage detection end and a second voltage detection end in parallel, and an emitter is respectively connected with a negative polarity end and a central control zero potential point of the automobile battery; the first voltage detection end and the second voltage detection end are connected to the single chip microcomputer, and a third output end of the single chip microcomputer controls and conducts the secondary power supply chip;
when the first output end and the second output end of the single chip microcomputer output high levels, a pressure difference exists between the first voltage detection end and the second voltage detection end, the single chip microcomputer judges whether the pressure difference is larger than a preset value or not, if yes, the third output end is controlled to output low levels, and otherwise, the high levels are output.
2. The circuit of claim 1, wherein the circuit for shifting the voltage to guarantee the input voltage of the secondary power supply based on the central control ground is characterized in that: the collectors of the triode Q1 and the triode Q2 are respectively connected with resistors R5 and R6, R7 and R8 in series and then are connected to the power supply end of the single chip microcomputer, and the middle of the resistors R5 and R6, the resistors R7 and the resistors R8 are connected in parallel and input into the first voltage detection end and the second voltage detection end; the resistance of the resistor R5 is equal to that of the resistor R6, and the resistance of the resistor R7 is equal to that of the resistor R8.
3. The circuit of claim 2, wherein the circuit for shifting the voltage to guarantee the input voltage of the secondary power supply based on the central control ground is characterized in that: when the first output end and the second output end of the single chip microcomputer output low levels, the voltage values of the first voltage detection end and the second voltage detection end are equal to the voltage value of the power supply end of the single chip microcomputer; when the first output end and the second output end output high levels, the voltage values of the first voltage detection end and the second voltage detection end are respectively equal to half of the sum of the voltage value of the power end of the single chip microcomputer and the voltage value of the negative polarity end of the automobile battery, and half of the sum of the voltage value of the power end of the single chip microcomputer and the voltage value of the central control zero potential point.
4. A circuit for centrally controlled offset voltage based on claims 1 to 3, characterized in that: the third output end of the single chip microcomputer is connected with the base electrode of a triode Q4, the collector electrode of a triode Q4 is connected with the secondary power supply chip through an MOS (metal oxide semiconductor) tube Q3, and the emitter electrode of the triode Q4 is grounded.
5. The circuit of claim 4, wherein the circuit for shifting the voltage to guarantee the input voltage of the secondary power supply based on the central control ground is characterized in that: the MOS transistor Q3 is a P-channel type MOS transistor; the G pole of the MOS transistor Q3 is connected with the collector of the triode Q4, the D pole is connected with the input voltage, and the S pole is connected with the secondary power chip.
6. A system for biasing a voltage based on a central control ground to guarantee a secondary power supply input voltage, comprising: comprises a singlechip;
the single chip microcomputer is used for detecting the voltage difference between the first voltage detection end and the second voltage detection end when the first output end and the second output end of the single chip microcomputer are at a stable high level; and the power supply to the secondary power supply chip is interrupted when the pressure difference is detected to be greater than a preset value.
7. The system of claim 6, wherein the system is configured to offset the voltage to ensure the input voltage of the secondary power supply based on the central control, and further comprising:
and the singlechip is used for detecting the voltage difference between the first voltage detection end and the second voltage detection end when detecting that the output level of the self-interrupt output port is a stable high level.
8. The system of claim 7, wherein the offset voltage is based on a central control to ensure the input voltage of the secondary power supply, and wherein: the timer is electrically connected with the single chip microcomputer;
the single chip microcomputer is used for controlling the conduction of the timer when detecting that the pressure difference is respectively greater than a preset value and smaller than the preset value;
the timer is used for calculating the receiving time length of the current control signal; the system is also used for judging whether the receiving time length is greater than a time threshold value, if so, sending a detection termination signal to the singlechip, and if not, continuously timing;
and the singlechip is used for terminating the detection of the voltage difference between the first voltage detection end and the second voltage detection end when receiving the termination detection signal.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130193754A1 (en) * 2011-09-20 2013-08-01 Hitachi Automotive Systems, Ltd. Electronic control unit for automobile
CN205086831U (en) * 2015-11-11 2016-03-16 重庆电讯职业学院 Auxiliary power supply system for vehicles
CN105471591A (en) * 2015-12-30 2016-04-06 浙江光大通信设备有限公司 POE power supply system and power supply method
CN205249247U (en) * 2015-12-30 2016-05-18 浙江光大通信设备有限公司 POE power supply system
CN206321697U (en) * 2016-11-30 2017-07-11 广州视源电子科技股份有限公司 A kind of over-voltage detection circuit and switching power circuit
CN110829804A (en) * 2019-11-22 2020-02-21 无锡市晶源微电子有限公司 Drive circuit with output tube protection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130193754A1 (en) * 2011-09-20 2013-08-01 Hitachi Automotive Systems, Ltd. Electronic control unit for automobile
CN205086831U (en) * 2015-11-11 2016-03-16 重庆电讯职业学院 Auxiliary power supply system for vehicles
CN105471591A (en) * 2015-12-30 2016-04-06 浙江光大通信设备有限公司 POE power supply system and power supply method
CN205249247U (en) * 2015-12-30 2016-05-18 浙江光大通信设备有限公司 POE power supply system
CN206321697U (en) * 2016-11-30 2017-07-11 广州视源电子科技股份有限公司 A kind of over-voltage detection circuit and switching power circuit
CN110829804A (en) * 2019-11-22 2020-02-21 无锡市晶源微电子有限公司 Drive circuit with output tube protection

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