CN206302401U - Communication isolation and level shifting circuit - Google Patents
Communication isolation and level shifting circuit Download PDFInfo
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- CN206302401U CN206302401U CN201621468855.8U CN201621468855U CN206302401U CN 206302401 U CN206302401 U CN 206302401U CN 201621468855 U CN201621468855 U CN 201621468855U CN 206302401 U CN206302401 U CN 206302401U
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Abstract
The utility model discloses a kind of communication isolation and level shifting circuit, one kind communication isolation and level shifting circuit, is connected with battery with main frame respectively, and it includes tie point and the second branch road；The tie point includes diode D1, pull-up resistor R1, pull-up resistor R3, and second branch road includes triode Q1, triode Q2, pull-up resistor R8, pull-up resistor R10.The utility model solves the communication function between different power voltage MCU, and main frame high pressure is added on battery and damages battery when can prevent main frame from occurring abnormal.
Description
Technical field
The utility model is related to communication isolation and level conversion field, especially relates to a kind of communication isolation and level
Change-over circuit.
Background technology
, it is necessary to realize the communication between battery and main frame in the application of present intelligent battery, can usually use serial ports and lead to
News, in this case, because the supply voltage of MCU used on the BMS of battery can differ with the supply voltage of main frame MCU
Sample, so can not be directly connected to be communicated, and needs to do transfer by level conversion and isolation circuit, in the prior art,
Communication isolating is inefficient and complex with level shifting circuit.
Utility model content
Main purpose of the present utility model is a kind of simple efficient communication isolation of offer and level shifting circuit.
The utility model proposes one kind communication isolation and level shifting circuit, it is connected with battery with main frame respectively, it includes
Tie point and the second branch road；
The tie point includes diode D1, pull-up resistor R1, pull-up resistor R3, and the positive pole of the diode D1 is electrically connected
The data receiver of the battery is connect, the negative pole of the diode D1 electrically connects the data sending terminal of the main frame, the pull-up
One end of resistance R1 data receiver respectively with the battery, the positive pole of diode D1 are connected, other end connection 3.3V voltages,
One end of pull-up resistor R3 data sending terminal respectively with the main frame, the negative pole of diode D1 are connected, other end connection
5V voltages, the tie point realize data receiver sending signal from the data sending terminal of the main frame to the battery when
Level conversion isolate with voltage；
Second branch road includes triode Q1, triode Q2, pull-up resistor R8, pull-up resistor R10, the triode Q1
Base stage electrically connect the data sending terminal of the battery, the colelctor electrode of the triode Q1 electrically connects the base of the triode Q2
Pole, the emitter stage of the triode Q1 connects 3.3V voltages, and the data of the colelctor electrode electrical connection main frame of the triode Q2 connect
Receiving end, the emitter stage electrical connection GND ends of the triode Q2, one end of the pull-up resistor R8 respectively with the data of the battery
The base stage connection of transmitting terminal, triode Q1, other end connection 3.3V voltages, one end of the pull-up resistor R10 respectively with it is described
The colelctor electrode connection of the data receiver, triode Q2 of main frame, other end connection 5V voltages, second branch road realizes described
Data receiver sending signal from the data sending terminal of battery to the main frame when level conversion isolate with voltage；
The first drop-down metal-oxide-semiconductor is additionally provided with, the drain electrode of the first drop-down metal-oxide-semiconductor connects the data sending terminal of the battery,
Source electrode connection GND ends；
The second drop-down metal-oxide-semiconductor is additionally provided with, the drain electrode of the second drop-down metal-oxide-semiconductor connects the data sending terminal of the main frame,
Source electrode connection GND ends.
Further, the battery is provided with a MCU, and the grid of the first drop-down metal-oxide-semiconductor connects a MCU,
When the data sending terminal of the battery sends digital signaling zero, the drop-down metal-oxide-semiconductor conducting of MCU controls described first makes
The data is activation terminal voltage of the battery is 0；
The main frame is provided with the 2nd MCU, and the grid of the second drop-down metal-oxide-semiconductor connects the 2nd MCU, when the main frame
Data sending terminal when sending digital signaling zero, the drop-down metal-oxide-semiconductor conducting of the 2nd MCU control described second makes the main frame
Data is activation terminal voltage is 0.
Further, also including resistance R2, one end of the resistance R2 is connected with the negative pole of the diode D1, the other end
It is connected with the data sending terminal of main frame.
Further, also including diode D2, the positive pole of the diode D2 is electrically connected with the colelctor electrode of the triode Q1
Connect, negative pole is electrically connected with the base stage of the triode Q2.
Further, also including resistance R9, one end of the resistance R9 is connected with the battery data transmitting terminal, the other end
With being connected for the base stage of the triode Q1, also including resistance R5, the negative pole of one end of the resistance R5 and the diode D2
Connection, the other end is connected with the base stage of the triode Q2, also including resistance R6, one end and the triode of the resistance R6
Q2 base stage connection, the other end is connected with the emitter stage of triode Q2, also including resistance R7, one end of the resistance R7 with it is described
The colelctor electrode connection of triode Q2, the other end is connected with the data receiver of main frame.
Further, also including resistance R4, one end of the resistance R4 is connected with the colelctor electrode of the triode Q1, another
End connection GND ends.
Further, the diode D1 is silicone tube or germanium tube.
Further, the diode D2 is silicone tube or germanium tube.
Further, the triode Q1 is PNP type triode.
Further, the triode Q2 is NPN type triode.
The beneficial effects of the utility model：The utility model provides a kind of simple efficient change-over circuit, either electricity high
Pressure interface signal is transmitted to low voltage interface transmission or low voltage interface signal to high voltage interface, by of the present utility model
After the transfer of circuit, communication isolating and level conversion can be realized, solve the communication function between different power voltage MCU,
Main frame high pressure when main frame occurs abnormal is also prevented to be added on battery and damage battery.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram for communicating isolation and level shifting circuit of the embodiment of the utility model one；
Fig. 2 is a kind of pole for communicating isolation and the first drop-down metal-oxide-semiconductor in level shifting circuit of the embodiment of the utility model one
Property connection figure；
Fig. 3 is a kind of pole for communicating isolation and the second drop-down metal-oxide-semiconductor in level shifting circuit of the embodiment of the utility model one
Property connection figure.
The realization of the utility model purpose, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this
Utility model.
Reference picture 1-3, one kind communication isolation and level shifting circuit, are connected with battery 10 with main frame 20 respectively, and it includes
The branch road 40 of tie point 30 and second；Tie point 30 includes diode D1, pull-up resistor R1, pull-up resistor R3, diode D1
Positive pole electrically connect the data receiver of battery 10, the negative pole of diode D1 electrically connects the data sending terminal of main frame 20, pull-up electricity
Hinder one end data receiver respectively with battery 10 of R1, the positive pole of diode D1 be connected, other end connection 3.3V voltages are pulled up
One end of resistance R3 data sending terminal respectively with main frame 20, the negative pole of diode D1 are connected, other end connection 5V voltages, first
Branch road 30 realize data receiver sending signal from the data sending terminal of main frame to battery when level conversion isolate with voltage,
Realize signal transmission.
Second branch road 40 includes triode Q1, triode Q2, pull-up resistor R8, pull-up resistor R10, the base stage of triode Q1
Electrically connect the data sending terminal of battery 10, the base stage of the colelctor electrode electrical connection triode Q2 of triode Q1, the transmitting of triode Q1
Pole connects 3.3V voltages, and the colelctor electrode of triode Q2 electrically connects the data receiver of main frame 20, the emitter stage electrical connection of triode Q2
GND ends, one end of pull-up resistor R8 data sending terminal respectively with battery 10, the base stage of triode Q1 are connected, other end connection
3.3V voltages, one end of pull-up resistor R10 data receiver respectively with main frame 20, the colelctor electrode of triode Q2 are connected, another
End connection 5V voltages, the second branch road 40 realize data receiver sending signal from the data sending terminal of battery 10 to main frame 20 when
Level conversion isolate with voltage, realize signal transmission.It is additionally provided with the first drop-down metal-oxide-semiconductor 201, the leakage of the first drop-down metal-oxide-semiconductor 201
Pole connects the data sending terminal of battery, source electrode connection GND ends；It is additionally provided with the second drop-down metal-oxide-semiconductor 301, the second drop-down metal-oxide-semiconductor 301
Drain electrode connection main frame data sending terminal, source electrode connection GND ends.
In the embodiment of the utility model one, above-mentioned pull-up resistor is that uncertain signal is existed by a resistance clamper
High level, resistance plays metering function simultaneously.It is drop-down similarly, be also by uncertain signal by a resistance clamper in low electricity
It is flat.
In the embodiment of the utility model one, above-mentioned metal-oxide-semiconductor is exactly insulating gate type field effect tube, and MOSFET, one are named as entirely
As be metal (metal)-oxide (oxide)-semiconductor (semiconductor) field-effect transistor, or claim be gold
Category-insulator (insulator)-semiconductor.The source (source electrode) and drain (depletion layer) of metal-oxide-semiconductor can be what is exchanged,
They are the N-type regions formed in p-type backgate.As a rule, this Liang Ge area is the same, even if two ends pair
Tune does not interfere with the performance of device yet.In the present embodiment, the first drop-down metal-oxide-semiconductor and the second drop-down MOS are NMOS tubes.
In the embodiment of the utility model one, above-mentioned BMS is battery management system, is the tie between battery and user,
Main object is secondary cell.There are some following shortcomings in secondary cell, such as storage energy is few, short life, connection in series-parallel are used
Problem, safety in utilization, battery electric quantity estimation difficulty etc..The performance of battery is very complicated, and different types of battery behavior is also
Differ greatly.Battery management system mainly aims at the utilization rate that can improve battery, prevent battery occur overcharging and
Over-discharge, extends the service life of battery, monitors the state of battery.With the development of battery management system, can also increase it
Its function.
In the embodiment of the utility model one, above-mentioned serial communication (Serial Communication) refers to external equipment
And intercomputer, by data signal line, ground wire, control line etc., step-by-step is transmitted a kind of communication modes of data, this logical
The data wire that letter mode is used is few, and communications cost can be saved in telecommunication, but its transmission speed is lower than parallel transmission.
In the embodiment of the utility model one, the magnitude of voltage of above-mentioned high level is 2.5-5.5V, the numeral letter that control sends
Number be 1.
In the embodiment of the utility model one, above-mentioned low level magnitude of voltage is 0-1.5V, the data signal that control sends
It is 0.
In the present embodiment, tie point 30 is that TX ' holds data receiver to battery 10 from the transmitting terminal of main frame 20
That is RXD ends transmission signal.TX ' ends electrically connect the negative pole of diode D1 by resistance R2, and resistance R2 plays a part of partial pressure current stabilization,
TX ' ends are additionally provided with pull-up resistor R3, and in the present embodiment, pull-up resistor R3 connects the voltage of main frame, and by the transmitting terminal of main frame 20
Voltage is pulled to 5V, and the positive pole electrical connection RXD ends of diode, RXD ends are additionally provided with pull-up resistor R1, in the present embodiment, pull-up
Resistance R1 connects cell voltage, and the voltage of the data receiver of battery is pulled into 3.3V, it will be understood that using different voltages
Battery 10 and main frame 20 when, pull-up resistor just voltage pull-up voltage can be differently configured from the present embodiment.Working as TX ' ends needs hair
When sending data signal 1, because the voltage that TX ' holds is pulled to 5V i.e. high level by pull-up resistor R3, so TX ' ends are in positive reason
It is to send data signal 1 under condition, due to the one-way conduction of diode, the voltage of 5V cannot be transferred to RXD by diode, but
3.3V i.e. high level is pulled to because the voltage at RXD ends is pulled up resistance R1, is so achieved that working as TX ' is output as 1 electricity i.e. high
During flat 5V, receiving terminal RXD is also 1 i.e. high level 3.3V, realizes signal transmission, while the 5V voltages that also prevent TX ' ends add
The MCU200 for causing battery 10 to RXD ends is damaged.When TX ' ends need to send digital signaling zero, main frame 20 is by second
MCU300 controls the second drop-down metal-oxide-semiconductor 301, turns on the second drop-down metal-oxide-semiconductor 301, i.e. the voltage at TX ' ends is pulled down to 0V, this
In implementation method, the first drop-down metal-oxide-semiconductor 201 and the second drop-down metal-oxide-semiconductor 301 are all located on MCU, diode D1 in present embodiment
Silicone tube is used, due to the one-way conduction of diode D1, the pressure drop of diode D1 is about 0.7V, i.e. diode D1 two ends
Voltage between voltage for 0.7V be low level, and the positive terminal of diode D1 be RXD ends, so the first of battery 10
MCU200 can judge that 0.7V low levels are digital signaling zero, so be achieved that when TX ' is output as 0, and receiving terminal RXD is also 0.
It is appreciated that when diode D1 uses germanium tube, it is still low level that the step-down of diode is about 0.3V, so using germanium
The effect of pipe is identical with the effect using the effect of silicone tube in the utility model.
In the present embodiment, Article 2 branch road 40 from the data sending terminal of battery 10 be data of the TXD ends to main frame 20
Receiving terminal is RX ' ends transmission signal.TXD ends electrically connect the base stage of triode Q1 by resistance R9, and TXD ends also pass through pull-up resistor
R8 connects the voltage of battery 10, and the voltage at TXD ends is pulled into 3.3V, and in present embodiment, triode Q1 uses positive-negative-positive three
Pole pipe, resistance R9 plays a part of partial pressure current stabilization, and the emitter stage of triode Q1 connects the voltage of battery 10 so that the hair of triode Q1
The voltage of emitter-base bandgap grading is pulled to 3.3V, and the positive pole of the current collection limit connection diode D2 of triode Q1, the negative pole of diode D2 leads to
The base stage of resistance R5 electrical connection triodes Q2 is crossed, in present embodiment, triode Q2 uses NPN type triode, resistance R5
Play a part of partial pressure current stabilization, the colelctor electrode of triode Q2 is held with RX ' by resistance R7 and electrically connected, and RX ' ends are again by pull-up resistor
R10 connects the voltage of main frame 20, and voltage is pulled into 5V；The emitter stage electrical connection GND ends of triode Q2, the base stage of triode Q2 with
Resistance R6 is also parallel between emitter stage, resistance R6 plays a part of stabilization triode Q2；The colelctor electrode of triode Q1 also passes through
Resistance R4 electrical connection GND ends, solve voltage suspension unsure state.When TXD ends need to send digital signaling zero, TXD ends
By controlling the first drop-down metal-oxide-semiconductor 201 in a MCU200, turn on the first drop-down metal-oxide-semiconductor 201, the voltage at TXD ends is pulled down to
0V, because the characteristic of PNP type triode, i.e. emitter voltage are more than base voltage, base voltage is more than collector voltage, makes again
Triode Q1 is obtained to be switched on.After triode Q1 is switched on, because triode Q2 uses NPN type triode, so when three poles
When the base stage of pipe Q2 has voltage, triode Q2 can also be switched on, and after triode Q2 is switched on, RX ' ends are connected to GND ends so that
The voltage at RX ' ends is just 0, and the 2nd MCU300 of main frame 20 can judge to receive low level signal 0, be so achieved that and work as TXD
RX ' ends also receive digital signaling zero when end output digit signals are 0.When TXD ends need to send data signal 1, TXD ends are former
Originally pull-up resistor R8 is had been provided with, pull-up resistor connects the voltage of battery 10, and is 3.3V by TXD terminal voltages pull-up, battery 10
This voltage can be sent data signal 1 by the first MCU200 as TXD ends as the signal voltage for needing to send, due to TXD ends
Voltage be equal to triode Q1 emitter voltage, according to the characteristic of triode so that triode Q1 cannot be turned on, triode Q1 without
After method conducting, triode Q2 cannot also be turned on, and RX ' ends have connect host voltage by pull-up resistor R10, and by the data of main frame 20
Receiving-end voltage is pulled to 5V, and the 2nd MCU300 of main frame 20 can be thus real using this voltage as the signal voltage for receiving
Show when TXD sends data signal 1, RX ' ends also receive data signal 1.The presence of diode D2 leads to the second branch road 40
It is better that letter is isolated.No matter triode Q1 and triode Q2 uses what type of triode, only need to ensure to work as TXD
When end sends digital signaling zero, triode Q1 can be turned on, and triode Q2 can be turned on, when TXD ends send data signal 1, three
Pole pipe Q1 cannot be turned on, and triode Q2 cannot be turned on.
In sum, the utility model provides a kind of simple efficient change-over circuit, and either main frame 20 is sent out to battery 10
Data, or battery 10 are sent to send data to main frame 20, i.e., either high voltage interface signal is transmitted still to low voltage interface
Low voltage interface signal to high voltage interface transmit, by after circuit transfer of the present utility model, can realize communication isolating with
Level conversion, solves the communication function between different power voltage MCU, is also prevented from main frame 20 and main frame 20 during exception occurs
High pressure is added on battery and damages battery 10.
Preferred embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited,
Equivalent structure or equivalent flow conversion that every utilization the utility model specification and accompanying drawing content are made, or directly or indirectly fortune
Used in other related technical fields, similarly it is included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of communication isolation and level shifting circuit, are connected, it is characterised in that it includes first with battery with main frame respectively
Road and the second branch road；
The tie point includes the positive pole electrical connection institute of diode D1, pull-up resistor R1, pull-up resistor R3, the diode D1
The data receiver of battery is stated, the negative pole of the diode D1 electrically connects the data sending terminal of the main frame, the pull-up resistor
One end of R1 data receiver respectively with the battery, the positive pole of diode D1 are connected, other end connection 3.3V voltages, described
One end of pull-up resistor R3 data sending terminal respectively with the main frame, the negative pole of diode D1 are connected, other end connection 5V electricity
Pressure, the tie point realize data receiver sending signal from the data sending terminal of the main frame to the battery when electricity
Flat turn is changed and isolated with voltage；
Second branch road includes triode Q1, triode Q2, pull-up resistor R8, pull-up resistor R10, the base of the triode Q1
Pole electrically connects the data sending terminal of the battery, and the colelctor electrode of the triode Q1 electrically connects the base stage of the triode Q2, institute
The emitter stage for stating triode Q1 connects 3.3V voltages, and the colelctor electrode of the triode Q2 electrically connects the data receiver of the main frame,
The emitter stage electrical connection GND ends of the triode Q2, one end of the pull-up resistor R8 respectively with the data is activation of the battery
End, the base stage connection of triode Q1, other end connection 3.3V voltages, one end of the pull-up resistor R10 respectively with the main frame
Data receiver, the colelctor electrode connection of triode Q2, other end connection 5V voltages, second branch road realizes the battery
Data receiver sending signal from data sending terminal to the main frame when level conversion isolate with voltage；
It is additionally provided with the first drop-down metal-oxide-semiconductor, the data sending terminal of the drain electrode connection battery of the first drop-down metal-oxide-semiconductor, source electrode
Connection GND ends；
It is additionally provided with the second drop-down metal-oxide-semiconductor, the data sending terminal of the drain electrode connection main frame of the second drop-down metal-oxide-semiconductor, source electrode
Connection GND ends.
2. communication as claimed in claim 1 is isolated and level shifting circuit, it is characterised in that the battery is provided with a MCU,
The grid of the first drop-down metal-oxide-semiconductor connects a MCU, when the data sending terminal of the battery sends digital signaling zero,
First MCU controls the described first drop-down metal-oxide-semiconductor conducting to make the data is activation terminal voltage of the battery be 0；
The main frame is provided with the 2nd MCU, and the grid of the second drop-down metal-oxide-semiconductor connects the 2nd MCU, when the number of the main frame
When sending digital signaling zero according to transmitting terminal, the drop-down metal-oxide-semiconductor conducting of the 2nd MCU controls described second makes the data of the main frame
Sending-end voltage is 0.
3. communication as claimed in claim 1 is isolated and level shifting circuit, it is characterised in that also including resistance R2, the electricity
The one end for hindering R2 is connected with the negative pole of the diode D1, and the other end is connected with the data sending terminal of main frame.
4. communication as claimed in claim 1 is isolated and level shifting circuit, it is characterised in that described also including diode D2
The positive pole of diode D2 is electrically connected with the colelctor electrode of the triode Q1, and negative pole is electrically connected with the base stage of the triode Q2.
5. communication as claimed in claim 1 is isolated and level shifting circuit, it is characterised in that also including resistance R9, the electricity
The one end for hindering R9 is connected with the battery data transmitting terminal, and the other end is connected with the base stage of the triode Q1, also including electricity
Resistance R5, one end of the resistance R5 is connected with the negative pole of the diode D2, and the other end is connected with the base stage of the triode Q2,
Also include resistance R6, one end of the resistance R6 is connected with the base stage of the triode Q2, the transmitting of the other end and triode Q2
Pole connects, and also including resistance R7, one end of the resistance R7 be connected with the colelctor electrode of the triode Q2, the other end and main frame
Data receiver is connected.
6. communication as claimed in claim 1 is isolated and level shifting circuit, it is characterised in that also including resistance R4, the electricity
The one end for hindering R4 is connected with the colelctor electrode of the triode Q1, other end connection GND ends.
7. communication isolation as claimed in claim 1 and level shifting circuit, it is characterised in that the diode D1 be silicone tube or
Germanium tube.
8. communication isolation as claimed in claim 1 and level shifting circuit, it is characterised in that the diode D2 be silicone tube or
Germanium tube.
9. communication as claimed in claim 1 is isolated and level shifting circuit, it is characterised in that the triode Q1 is positive-negative-positive
Triode.
10. communication as claimed in claim 1 is isolated and level shifting circuit, it is characterised in that the triode Q2 is NPN type
Triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621468855.8U CN206302401U (en) | 2016-12-29 | 2016-12-29 | Communication isolation and level shifting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621468855.8U CN206302401U (en) | 2016-12-29 | 2016-12-29 | Communication isolation and level shifting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206302401U true CN206302401U (en) | 2017-07-04 |
Family
ID=59204906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621468855.8U Withdrawn - After Issue CN206302401U (en) | 2016-12-29 | 2016-12-29 | Communication isolation and level shifting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206302401U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712764A (en) * | 2016-12-29 | 2017-05-24 | 欣旺达电子股份有限公司 | Communication isolation and level switching circuit |
| CN113541673A (en) * | 2020-04-15 | 2021-10-22 | 成都鼎桥通信技术有限公司 | Level conversion circuit, module and gateway |
-
2016
- 2016-12-29 CN CN201621468855.8U patent/CN206302401U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712764A (en) * | 2016-12-29 | 2017-05-24 | 欣旺达电子股份有限公司 | Communication isolation and level switching circuit |
| CN106712764B (en) * | 2016-12-29 | 2024-03-22 | 欣旺达电子股份有限公司 | Communication isolation and level conversion circuit |
| CN113541673A (en) * | 2020-04-15 | 2021-10-22 | 成都鼎桥通信技术有限公司 | Level conversion circuit, module and gateway |
| CN113541673B (en) * | 2020-04-15 | 2024-02-13 | 成都鼎桥通信技术有限公司 | Level conversion circuit, module and gateway |
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