CN218647078U - Detection circuit compatible with positive and negative signals - Google Patents
Detection circuit compatible with positive and negative signals Download PDFInfo
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- CN218647078U CN218647078U CN202222625694.0U CN202222625694U CN218647078U CN 218647078 U CN218647078 U CN 218647078U CN 202222625694 U CN202222625694 U CN 202222625694U CN 218647078 U CN218647078 U CN 218647078U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a detection circuitry of compatible positive negative signal, including signal gating module and the signal identification module of connection between signal input part and signal output part, signal gating module includes anodal input branch road and negative pole input branch road, anodal input branch road with the one end of negative pole input branch road with signal input part connects, and its other end passes through signal identification module with signal output part connects, signal output part with MCU's signal detection mouth is connected. The utility model discloses can compatible positive and negative signal's detection, the signal state who will detect transmits for MCU can be applicable to positive negative pole signal detection scene, and can solve the strong interference that the present use opto-coupler keeps apart and bring and fragile problem.
Description
Technical Field
The utility model belongs to the technical field of the circuit technique and specifically relates to a detection circuitry that is used for a compatible positive negative signal.
Background
The MCU is used as the core of the lithium battery protection board, battery parameters of the voltage acquisition and protection circuit, the current acquisition and protection circuit and the temperature acquisition and protection circuit are read through the communication bus, the states of the battery pack and each single battery are evaluated by utilizing a built-in battery model, and on the basis, a control instruction is given to peripheral equipment (such as a heater) or a state display and alarm signal (an upper computer) is given according to corresponding control and protection strategies.
For the existing MCU, the general external signal recognition circuit can only recognize the positive high voltage signal, and is not suitable for applications requiring the use of negative and negative voltage signals. In addition, the existing positive electrode signal detection loop is usually realized by adopting optical coupling isolation, so that not only is strong interference generated, but also when external voltage is connected in series with abnormal high voltage, the circuit is easily burnt out by the method, and the whole system cannot be used.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a detection circuit of compatible positive negative signal.
The main contents of the utility model include:
the utility model provides a detection circuitry of compatible positive and negative signal, includes MCU and the detection signal circuit who is connected with MCU's signal detection mouth, detection signal circuit includes signal input part and signal output part, signal input part with be connected with signal gating module and signal identification module between the signal output part, signal gating module includes anodal input branch road and negative pole input branch road, anodal input branch road with the one end of negative pole input branch road with signal input part connects, and its other end passes through signal identification module with signal output part connects, signal output part with MCU's signal detection mouth is connected.
Preferably, the positive input branch comprises a first resistor and a first diode, one end of the first resistor is connected with the signal input end through an input resistor, the other end of the first resistor is connected with the positive electrode of the first diode, and the negative electrode of the first diode is connected with the signal identification module.
Preferably, the negative input branch comprises a second diode, a second triode and a second bias power supply; the second triode is of a PNP type, the base electrode of the second triode is connected with the anode of the second diode, the collector electrode of the second triode is connected with the signal identification module, and the emitter electrode of the second triode is connected with the second bias power supply through a second bias resistor; and the cathode of the second diode is connected with the signal input end through the input resistor.
Preferably, the negative input branch further includes a second current limiting resistor and a second pull-down resistor, one end of the second current limiting resistor is connected to the base of the second triode, and the other end of the second current limiting resistor is connected to the anode of the second diode; the second pull-down resistor is connected between the emitter and the base of the second triode.
Preferably, the signal identification module includes a third diode, a third triode, a third bias power supply, and a third bias resistor; the third triode is of an NPN type, the base electrode of the third triode is connected with the negative electrode of the third diode, the emitting electrode of the third triode is grounded, and the collector electrode of the third triode is connected with the third bias power supply through the third bias resistor; and the anode of the third diode is respectively connected with the cathode of the first diode and the collector of the second triode.
Preferably, the signal identification module further includes a third current limiting resistor, a third pull-down resistor, a third identification resistor, and a third buffer capacitor; one end of the third current-limiting resistor is connected with the cathode of the third diode, and the other end of the third current-limiting resistor is connected with the base of the third triode; the third pull-down resistor is connected between the base electrode and the emitting electrode of the third triode; one end of the third identification resistor is connected with the collector of the third triode, the other end of the third identification resistor is connected with the signal output end, one end of the third buffer capacitor is connected with the signal output end, and the other end of the third buffer capacitor is grounded.
The beneficial effects of the utility model reside in that: the utility model provides a detection circuitry of compatible positive negative signal can compatible positive negative signal's detection, transmits the signal state who detects for MCU can be applicable to positive negative pole signal and detect the scene, and can solve the strong interference that the present use opto-coupler keeps apart and bring and the fragile problem.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solution protected by the present invention will be specifically described below with reference to the accompanying drawings.
Referring to fig. 1, the utility model provides a detection circuit compatible with positive and negative signals, which is extended outside the MCU of the existing battery protection motherboard and connected with the signal detection port of the MCU; the utility model discloses a detection circuitry include one be used for inserting external signal ' S signal input part S _ IN and one be used for with MCU ' S signal detection mouth is connected signal output part and the detection signal circuit of connection between signal input part S _ IN and signal output part, the detection signal circuit does not use the opto-coupler to keep apart, and uses the cooperation of triode and diode, has solved the fragile problem of opto-coupler, and can compatible positive and negative signal ' S access, realizes the detection discernment of positive and negative signal.
Specifically, the utility model discloses a signal gating module and signal identification module, wherein, signal gating module includes anodal input branch road and negative pole input branch road for the positive and negative signal of external signal input can both be received, is passed on to through corresponding branch road the signal identification module, through the control that enables signal, realizes level signal's change, thereby makes MCU's signal detection mouth can detect the change of level, and makes corresponding action.
IN one embodiment, the signal input terminal S _ IN is connected to an input resistor R5, and then connected to one end of the positive input branch and one end of the negative input branch; specifically, the positive input branch comprises a first resistor R8 and a first diode D3, one end of the first resistor R8 is connected to the signal input terminal S _ IN through an input resistor R5, the other end of the first resistor R8 is connected to the positive electrode of the first diode D3, and the negative electrode of the first diode D3 is connected to the signal identification module.
The negative input branch comprises a second diode D1, a second triode Q1, a second bias power supply VCC, a second current limiting resistor R4 and a second pull-down resistor R2; the second triode Q1 is of a PNP type, the base of the second triode Q1 is connected with the anode of the second diode D1 through a second current-limiting resistor R4, the collector of the second triode Q1 is connected with the signal identification module, and the emitter of the second triode Q1 is connected with the second bias power supply VCC through a second bias resistor R1; the cathode of the second diode D1 is connected to the signal input terminal S _ IN through the input resistor R5; the second pull-down resistor R2 is connected between the emitter and the base of the second triode Q1.
In one embodiment, the signal identification module includes a third diode D2, a third transistor Q2, a third bias power supply VCC _5V, a third bias resistor R3, a third current limiting resistor R7, a third pull-down resistor R9, a third identification resistor R6, and a third buffer capacitor C1; the third triode Q2 is of NPN type, a base of the third triode Q2 is connected to a negative electrode of the third diode D2 through the third current limiting resistor R7, an emitter thereof is grounded, and a collector thereof is connected to the third bias power supply through the third bias resistor R3 and VCC _5V; the third pull-down resistor R9 is connected between the base electrode and the emitting electrode of the third triode Q2; the anode of the third diode Q2 is respectively connected with the cathode of the first diode D3 and the collector of the second triode Q1; one end of the third identifying resistor R6 is connected with the collector of the third triode Q2, the other end of the third identifying resistor R is connected with the signal output end, one end of the third buffer capacitor C1 is connected with the signal output end, and the other end of the third buffer capacitor C1 is grounded.
When an anode signal is input from the outside, the anode signal passes through the input resistor R5, passes through the first resistor R8, the first diode D3 and the third diode D2, and then is transmitted to the base of the third triode Q2 due to the voltage division of the third current limiting resistor R7 and the third pull-down resistor R9, so that the base is conducted, after the third triode Q2 is conducted, the third bias power VCC _5V is grounded through the third bias resistor R3, so that the voltage sent into the signal detection port of the MCU by the third identification resistor R6 is reduced to 0V from 5V, and the signal detection port of the MCU detects the change of the level to make a corresponding action.
When the external input is a negative signal, the second bias power supply VCC supplies a negative signal to the anode of the second diode D1 through the second bias resistor R1, the second current limiting resistor R4 and the second pull-down resistor R4, a current is transmitted to the external negative signal through the input resistor R5, a voltage drop is generated between the emitter and the base of the second triode Q1 due to the fact that the current flows through the second pull-down resistor R2, the base of the second triode Q1 is conducted due to the obtained bias voltage, the current flows to the base of the third triode Q2 through the second triode Q1, the third diode D2 and the third current limiting resistor R7 from the second bias power supply VCC, and meanwhile, the third bias power supply VCC _5V is conducted to the ground through the third bias resistor R3, so that the voltage sent to the signal detection port of the MCU by the third identification resistor R6 is reduced from 5V to 0V, and the signal detection port of the MCU detects the change of the level to make a corresponding action.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (6)
1. The utility model provides a detection circuitry of compatible positive negative signal, its characterized in that, includes MCU and the detection signal circuit of being connected with MCU's signal detection mouth, detection signal circuit includes signal input part and signal output part, signal input part with be connected with signal gating module and signal identification module between the signal output part, signal gating module includes positive input branch road and negative pole input branch road, positive input branch road with the one end of negative pole input branch road with signal input part connects, and its other end passes through signal identification module with signal output part connects, signal output part with MCU's signal detection mouth is connected.
2. The positive-negative signal compatible detection circuit according to claim 1, wherein the positive input branch comprises a first resistor and a first diode, one end of the first resistor is connected to the signal input terminal through an input resistor, the other end of the first resistor is connected to the positive electrode of the first diode, and the negative electrode of the first diode is connected to the signal identification module.
3. The positive-negative signal compatible detection circuit according to claim 2, wherein the negative input branch comprises a second diode and a second triode, a second bias power supply; the second triode is of a PNP type, the base electrode of the second triode is connected with the anode of the second diode, the collector electrode of the second triode is connected with the signal identification module, and the emitter electrode of the second triode is connected with the second bias power supply through a second bias resistor; and the cathode of the second diode is connected with the signal input end through the input resistor.
4. The detection circuit compatible with positive and negative signals according to claim 3, wherein the negative input branch further comprises a second current limiting resistor and a second pull-down resistor, one end of the second current limiting resistor is connected to the base of the second triode, and the other end of the second current limiting resistor is connected to the anode of the second diode; the second pull-down resistor is connected between the emitter and the base of the second triode.
5. The detection circuit compatible with positive and negative signals of claim 3, wherein the signal identification module comprises a third diode, a third triode, a third bias power supply and a third bias resistor; the third triode is of an NPN type, the base electrode of the third triode is connected with the negative electrode of the third diode, the emitting electrode of the third triode is grounded, and the collector electrode of the third triode is connected with the third bias power supply through the third bias resistor; and the anode of the third diode is respectively connected with the cathode of the first diode and the collector of the second triode.
6. The detection circuit compatible with positive and negative signals according to claim 5, wherein the signal identification module further comprises a third current limiting resistor, a third pull-down resistor, a third identification resistor and a third buffer capacitor; one end of the third current limiting resistor is connected with the cathode of the third diode, and the other end of the third current limiting resistor is connected with the base electrode of the third triode; the third pull-down resistor is connected between the base electrode and the emitting electrode of the third triode; one end of the third identification resistor is connected with the collector of the third triode, the other end of the third identification resistor is connected with the signal output end, one end of the third buffer capacitor is connected with the signal output end, and the other end of the third buffer capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222625694.0U CN218647078U (en) | 2022-09-30 | 2022-09-30 | Detection circuit compatible with positive and negative signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222625694.0U CN218647078U (en) | 2022-09-30 | 2022-09-30 | Detection circuit compatible with positive and negative signals |
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| Publication Number | Publication Date |
|---|---|
| CN218647078U true CN218647078U (en) | 2023-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222625694.0U Active CN218647078U (en) | 2022-09-30 | 2022-09-30 | Detection circuit compatible with positive and negative signals |
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| CN (1) | CN218647078U (en) |
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- 2022-09-30 CN CN202222625694.0U patent/CN218647078U/en active Active
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