CN220857648U - Under-voltage protection circuit and system - Google Patents
Under-voltage protection circuit and system Download PDFInfo
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- CN220857648U CN220857648U CN202322154170.2U CN202322154170U CN220857648U CN 220857648 U CN220857648 U CN 220857648U CN 202322154170 U CN202322154170 U CN 202322154170U CN 220857648 U CN220857648 U CN 220857648U
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Abstract
The utility model discloses an under-voltage protection circuit and system. The utility model relates to the technical field of undervoltage protection, which comprises the following components: the power supply integrated circuit IC is provided with an enabling pin; the voltage dividing component is connected with the power supply component of the electric vehicle controller in parallel and is used for dividing the voltage of the power supply; the filter component is respectively connected with the voltage dividing component and an enabling pin of the power integrated circuit IC in series; the power supply integrated circuit IC is used for detecting the level signal output by the filtering component; the power integrated circuit IC is electrically connected to the load circuit. According to the technical scheme, the voltage division component is used for realizing voltage division, the filtering component is used for realizing filtering, the power integrated circuit IC is used for detecting the level signal output by the filtering component, the use cost is reduced, and the use experience of a user is improved.
Description
Technical Field
The present utility model relates to the field of undervoltage protection technologies, and in particular, to an undervoltage protection circuit and system.
Background
With the development of technology, the application of the battery is becoming more and more widespread, and the figure of the battery can be seen in various electronic fields. However, since the battery has a large energy density and causes a relatively large potential safety hazard if an abnormality occurs, special attention is required to protect the battery.
At present, in the prior art, through detecting the battery voltage, through connecting the positive and negative pole signal detection circuit at the battery, give little control unit (Microcontroller Unit, MCU) singlechip with the detected signal and discern, after reaching under-voltage, MCU gives control signal, the outage of direct current to direct current (Direct Current Direct Current, DCDC) switching power supply module of control battery rear end termination, power supply module's rear end load no longer consumes the electric quantity of battery thereupon to reach no longer consume battery energy after the battery voltage reaches the under-voltage point, so reach the purpose of protection battery. However, the problem is that the MCU singlechip is required to be independently supplied with power, if the MCU singlechip is not independently supplied with power, an under-voltage protection point is reached, and a control signal is not generated after the DCDC switching power supply module is powered off, so that the purpose of under-voltage protection is not achieved; meanwhile, the MCU singlechip needs an independent power supply loop, so that the complexity of the circuit and the cost are increased to a certain extent.
Disclosure of utility model
The utility model provides an undervoltage protection circuit and system, which solve the problem of independent power supply based on an MCU (micro control Unit) in the prior art, and detect a level signal output by a filter assembly through a power integrated circuit (INTEGRATED CIRCUIT, IC), thereby reducing the use cost and improving the use experience of users.
According to an aspect of the present utility model, there is provided an under-voltage protection circuit, the apparatus comprising: the power supply integrated circuit IC is provided with an enabling pin; wherein,
The voltage dividing component is connected with the power supply component of the electric vehicle controller in parallel and is used for dividing the voltage of the power supply;
the filter component is respectively connected with the voltage dividing component and an enabling pin of the power integrated circuit IC in series; the power supply integrated circuit IC is used for detecting the level signal output by the filtering component;
the power integrated circuit IC is electrically connected to the load circuit.
Optionally, the voltage dividing assembly includes: a first resistor and a second resistor; one end of the first resistor is respectively and electrically connected with the positive electrode of the power supply component of the electric vehicle controller and the power supply integrated circuit IC, and the other end of the first resistor is respectively and electrically connected with one end of the second resistor and the filter component; the other end of the second resistor is electrically connected with the negative electrode of the power supply component of the electric vehicle controller and the power supply integrated circuit IC respectively.
Optionally, the filtering component includes: a third resistor and capacitor; one end of the third resistor is respectively and electrically connected with the other end of the first resistor and one end of the second resistor, and the other end of the third resistor is respectively and electrically connected with one end of the capacitor and an enabling pin of the power integrated circuit IC; the other end of the capacitor is respectively and electrically connected with the negative electrode of the power supply component of the electric vehicle controller and the power supply integrated circuit IC.
Optionally, the power integrated circuit IC includes: a first pin, a second pin, and an enable pin; the first pin is respectively and electrically connected with the positive electrode of the power supply component of the electric vehicle controller and one end of the first resistor; the second pin is respectively and electrically connected with the negative electrode of the power supply component of the electric vehicle controller, the other end of the second resistor and the other end of the capacitor; the enabling pin is electrically connected with the other end of the third resistor and one end of the capacitor respectively.
Optionally, the method further comprises: a diode; one end of the diode is respectively and electrically connected with the other end of the third resistor and the other end of the capacitor, and the other end of the diode is connected with an enabling pin of the power integrated circuit IC; the diode is used for protecting the safety of the circuit.
Optionally, the method further comprises: a switching tube and a fourth resistor; the grid electrode of the switching tube is electrically connected with the other end of the diode, the source electrode of the switching tube is respectively electrically connected with one end of the fourth resistor and the enabling pin of the power integrated circuit IC, and the drain electrode of the switching tube is electrically connected with the second pin of the power integrated circuit IC; the fourth resistor is used for providing a high level for the third end of the power integrated circuit IC; the other end of the fourth resistor is electrically connected with one end of the first resistor and an enabling pin of the power integrated circuit IC respectively.
Optionally, the first resistor has a resistance of 49 kiloohms and the second resistor has a resistance of 1 kiloohm.
Optionally, if the level signal output by the filtering component is smaller than the level signal preconfigured on the enable pin of the power supply integrated circuit IC, the load circuit connected with the power supply integrated circuit IC is disconnected.
According to another aspect of the present utility model, there is also provided an under-voltage protection system, including: any one of the undervoltage protection circuit, the power supply component and the load circuit; wherein,
One end of the power supply component is connected with the undervoltage protection circuit in parallel;
The load circuit is electrically connected with the power integrated circuit IC of the undervoltage protection circuit.
Optionally, the power supply assembly comprises a battery.
The technical scheme of the utility model is that the undervoltage protection circuit comprises: the power supply integrated circuit IC is provided with an enabling pin; the voltage dividing component is connected with the power supply component of the electric vehicle controller in parallel and is used for dividing the voltage of the power supply; the filter component is respectively connected with the enabling pin of the voltage division component power supply integrated circuit IC in series; the power supply integrated circuit IC is used for detecting the level signal output by the filtering component; the power integrated circuit IC is electrically connected to the load circuit. According to the technical scheme, the voltage division is realized through the voltage division component, the filtering component is used for filtering, the power supply integrated circuit IC is used for detecting the level signal Output by the filtering component, MCU detection is not needed, and Input/Output (I/O) ports for inputting the MCU are saved. The under-voltage protection can be realized through the enabling module configured by the power integrated circuit IC, the use cost is reduced, and the use experience of a user is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an undervoltage protection circuit according to a first embodiment;
Fig. 2 is a schematic structural diagram of an undervoltage protection circuit provided in the second embodiment;
Fig. 3 is a schematic structural diagram of an undervoltage protection system provided in the third embodiment.
Detailed Description
In order that the manner in which the utility model may be better understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic diagram of an under-voltage protection circuit according to a first embodiment, which is applicable to under-voltage protection. As shown in fig. 1, the undervoltage protection circuit 1 of the present utility model specifically includes: the voltage dividing component 11, the filtering component 12 and the power supply integrated circuit IC13, the power supply integrated circuit IC13 is provided with the power supply integrated circuit IC13 of the enable pin.
The voltage dividing component 11 is connected in parallel with the power supply component 2 of the electric vehicle controller and is used for dividing the voltage of the power supply.
The filter assembly 12 is connected in series with the voltage dividing assembly 11 and the enable pin of the power supply integrated circuit IC13, respectively
The filtering component 12 is used for filtering the level signal output by the voltage dividing component 11, and the power integrated circuit IC13 is used for detecting the level signal output by the filtering component 12.
The power supply integrated circuit IC13 is electrically connected to the load circuit 3.
In one embodiment, the voltage dividing assembly 11 includes: a first resistor 1101 and a second resistor 1102.
One end of the first resistor 1101 is electrically connected to the positive electrode of the power module 2 and the power integrated circuit IC13 of the electric vehicle controller, and the other end of the first resistor 1101 is electrically connected to one end of the second resistor 1102 and the filter module 12. The other end of the second resistor 1102 is electrically connected to the negative electrode of the power supply module 2 of the electric vehicle controller and the power supply integrated circuit IC13, respectively.
In a specific embodiment, the resistance of the first resistor 1101 is 49 kiloohms, the resistance of the second resistor 1102 is 1 kiloohm, and the first resistor 1101 and the second resistor 1102 are used to achieve voltage division.
The filter assembly 12 includes: a third resistor 1201 and a capacitor 1202.
One end of the third resistor 1201 is electrically connected to the other end of the first resistor 1101 and one end of the second resistor 1102, and the other end of the third resistor 1201 is electrically connected to one end of the capacitor 1202 and an enable pin of the power integrated circuit IC 13; the other end of the capacitor 1202 is electrically connected to the negative electrode of the power supply module 2 of the electric vehicle controller and the power supply integrated circuit IC13, respectively.
In one embodiment, the third resistor 1201 has a resistance of 10 kiloohms and the capacitor 1202 has a model 104, which represents a capacitance of 0.1 microfarads, and the third resistor 1201 and the capacitor 1202 are used for filtering.
In one embodiment, the power integrated circuit IC13 includes: a first pin 1301, a second pin 1302, and an enable pin 1303.
The first pin 1301 is electrically connected with the positive electrode of the power supply component 2 of the electric vehicle controller and one end of the first resistor 1101 respectively; the second pin 1302 is electrically connected with the negative electrode of the power supply component 2 of the electric vehicle controller, the other end of the second resistor 1102 and the other end of the capacitor 1202 respectively; the enable pin 1303 is electrically connected to the other end of the third resistor 1201 and one end of the capacitor 1202, respectively.
The enable pin 1303 of the power integrated circuit IC13 is an Enable (EN) that enables each module and circuit, a separate EN signal representing a high enable signal valid, a low enable signal valid if there is a slope before the enable EN, EN being a flag of the enable, the enable being a control port that is valid indicating that the controlled function is active, i.e. output, and not valid. The power integrated circuit IC is model TPP2020.
Further, if the level signal output by the filtering component 12 is smaller than the level signal preconfigured on the enable pin 1303 of the power integrated circuit IC13, the load circuit 3 connected to the power integrated circuit IC13 is disconnected, which has the advantage of protecting the circuit and improving the user experience.
Specifically, in the working process of the undervoltage protection circuit 1, the voltage division of the power supply input by the power supply component 2 is realized through the first resistor 1101 and the second resistor 1102, then detection filtering of the circuit is realized based on the third resistor 1201 and the capacitor 1202, meanwhile, the on and off of the voltage division control circuit of the second resistor 1102 by any power supply input by the power supply component 2 are detected, when the voltage division of the second resistor 1102 by any power supply input by the power supply component 2 reaches the lowest starting voltage of the EN pin of the power supply integrated circuit IC13, the input of the power supply component 2 is stopped, and further, if the level signal output by the filtering component 12 is smaller than the level signal preconfigured by the enabling pin 1303 of the power supply integrated circuit IC13, the load circuit 3 connected with the power supply integrated circuit IC13 is disconnected. The purpose of under-voltage protection turn-off is achieved, the complexity of the circuit is greatly reduced, and the cost of the circuit is reduced.
According to the technical scheme of the embodiment, the undervoltage protection circuit comprises: the power supply integrated circuit IC is provided with an enabling pin; the voltage dividing component is connected with the power supply component of the electric vehicle controller in parallel and is used for dividing the voltage of the power supply; the filter component is respectively connected with the voltage dividing component and an enabling pin of the power integrated circuit IC in series; the power supply integrated circuit IC is used for detecting the level signal output by the filtering component; the power integrated circuit IC is electrically connected to the load circuit. On the basis of the embodiment, the voltage division is realized through the voltage division component, the filtering component realizes filtering, the power integrated circuit IC is used for detecting the level signal Output by the filtering component, MCU detection is not needed, and Input/Output (I/O) ports of the Input MCU are saved. The under-voltage protection can be realized through the enabling module configured by the power integrated circuit IC, the use cost is reduced, and the use experience of a user is improved.
Example two
Fig. 2 is a schematic structural diagram of an under-voltage protection circuit provided in the second embodiment, and further optimizes the under-voltage protection circuit based on the above embodiment, as shown in fig. 2, where the under-voltage protection circuit further includes: a diode 14, a switching tube 15 and a fourth resistor 16.
One end of the diode 14 is electrically connected to the other end of the third resistor 1201 and the other end of the capacitor 1202, and the other end of the diode 14 is electrically connected to the enable pin 1303 of the power integrated circuit IC 13; the diode 14 is used to protect the circuit.
The grid electrode of the switching tube 15 is electrically connected with the other end of the diode 14, the source electrode of the switching tube 15 is respectively electrically connected with one end of the fourth resistor 16 and the enabling pin 1303 of the power integrated circuit IC13, and the drain electrode of the switching tube 15 is electrically connected with the enabling pin 1303 of the power integrated circuit IC 13; the fourth resistor 16 is used to provide a high level to the enable pin 1303 of the power integrated circuit IC 13.
The other end of the fourth resistor 16 is electrically connected to one end of the first resistor 1101 and the first pin 1301 of the power integrated circuit IC13, respectively.
The model number of diode 14 is 1N4148. The switch tube 15 is an N-type metal-oxide-semiconductor NMOS transistor, and the model is NCE3420; the fourth resistor 16 has a resistance of 10 kiloohms.
Specifically, one end of the diode 14 is electrically connected to the other end of the third resistor 1201 and the other end of the capacitor 1202, respectively, and the other end of the diode 14 is electrically connected to the enable pin of the power integrated circuit IC 13; the grid electrode of the switching tube 15 is electrically connected with the other end of the diode 14, the source electrode of the switching tube 15 is respectively electrically connected with one end of the fourth resistor 16 and the enabling pin of the power integrated circuit IC13, and the drain electrode of the switching tube 15 is electrically connected with the second pin 1302 of the power integrated circuit IC 13; the other end of the fourth resistor 16 is electrically connected to one end of the first resistor 1101 and the first pin 1301 of the power integrated circuit IC13, respectively; the diode 14 is used to protect the circuit and the fourth resistor 16 is used to provide a high level to the enable pin of the power integrated circuit IC 13.
According to the technical scheme of the embodiment, the undervoltage protection circuit further comprises: a diode, a switching tube and a fourth resistor; one end of the diode is respectively and electrically connected with the other end of the third resistor and the other end of the capacitor, and the other end of the diode is electrically connected with an enabling pin of the power integrated circuit IC; the grid electrode of the switching tube is electrically connected with the other end of the diode, the source electrode of the switching tube is respectively electrically connected with one end of the fourth resistor and the enabling pin of the power integrated circuit IC, and the drain electrode of the switching tube is electrically connected with the second pin of the power integrated circuit IC; the other end of the fourth resistor is electrically connected with one end of the first resistor and the first pin of the power integrated circuit IC respectively. On the basis of the embodiment, the diode, the switching tube and the fourth resistor are added, and the fourth resistor is used for providing high level for the enabling pin of the power integrated circuit IC, so that the high efficiency and the safety of undervoltage protection are improved.
Example III
Fig. 3 is a schematic structural diagram of an under-voltage protection system provided in the third embodiment, which is applicable to the under-voltage protection. As shown in fig. 3, the undervoltage protection system of the present utility model specifically includes: an undervoltage protection circuit 1, a power supply assembly 2 and a load circuit 3.
Wherein the power supply assembly 2 is connected in parallel with the under-voltage protection circuit 1. The load circuit 3 is electrically connected to the power supply integrated circuit IC13 of the undervoltage protection circuit 1.
Wherein the power supply assembly 2 comprises a battery.
Specifically, the power supply assembly 2 is connected in parallel with the undervoltage protection circuit 1, the load circuit 3 is electrically connected with the power supply integrated circuit IC13 of the undervoltage protection circuit 1, the undervoltage protection of the power supply assembly 2 is realized through the undervoltage protection circuit 1, the complexity of the circuit is reduced, and the use experience of a user is improved.
According to the technical scheme of the embodiment, the under-voltage protection system comprises: the undervoltage protection circuit 1, the power supply component 2 and the load circuit 3 are arranged in any one, the power supply component 2 is connected with the undervoltage protection circuit 1 in parallel, and the load circuit 3 is electrically connected with the power supply integrated circuit IC13 of the undervoltage protection circuit 1. Based on the above embodiment, the undervoltage protection of the power supply assembly 2 is realized through the undervoltage protection circuit 1, so that the complexity of the circuit is reduced, and the use experience of a user is improved.
The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. An undervoltage protection circuit for an electric vehicle controller, comprising: the power supply integrated circuit IC is provided with an enabling pin; wherein,
The voltage dividing component is connected with the power supply component of the electric vehicle controller in parallel and is used for dividing the power supply;
The filter component is respectively connected with the voltage dividing component and an enabling pin of the power supply integrated circuit IC in series; the power supply integrated circuit IC is used for detecting the level signal output by the filtering component;
the power integrated circuit IC is electrically connected to the load circuit.
2. The undervoltage protection circuit of claim 1, wherein the voltage divider assembly comprises: a first resistor and a second resistor; wherein,
One end of the first resistor is respectively and electrically connected with the positive electrode of the power supply component of the electric vehicle controller and the power supply integrated circuit IC, and the other end of the first resistor is respectively and electrically connected with one end of the second resistor and the filter component;
The other end of the second resistor is electrically connected with the negative electrode of the power supply component of the electric vehicle controller and the power supply integrated circuit IC respectively.
3. The undervoltage protection circuit of claim 2, wherein the filter component comprises: a third resistor and capacitor; wherein,
One end of the third resistor is electrically connected with the other end of the first resistor and one end of the second resistor respectively, and the other end of the third resistor is electrically connected with one end of the capacitor and an enabling pin of the power integrated circuit IC respectively;
The other end of the capacitor is electrically connected with the negative electrode of the power supply component of the electric vehicle controller and the power supply integrated circuit IC respectively.
4. The undervoltage protection circuit of claim 3, wherein the power integrated circuit IC comprises: a first pin, a second pin, and an enable pin; wherein,
The first pin is respectively and electrically connected with the positive electrode of the power supply component of the electric vehicle controller and one end of the first resistor;
the second pin is respectively and electrically connected with the negative electrode of the power supply component of the electric vehicle controller, the other end of the second resistor and the other end of the capacitor;
And the enabling pin is respectively and electrically connected with the other end of the third resistor and one end of the capacitor.
5. The under-voltage protection circuit of claim 4, further comprising: a diode; wherein,
One end of the diode is electrically connected with the other end of the third resistor and one end of the capacitor respectively, and the other end of the diode is electrically connected with the enabling pin of the power integrated circuit IC; the diode is used for protecting the safety of the circuit.
6. The under-voltage protection circuit of claim 5, further comprising: a switching tube and a fourth resistor; wherein,
The grid electrode of the switching tube is electrically connected with the other end of the diode, the source electrode of the switching tube is respectively electrically connected with one end of the fourth resistor and the enabling pin of the power supply integrated circuit IC, and the drain electrode of the switching tube is electrically connected with the second pin of the power supply integrated circuit IC; the fourth resistor is used for providing a high level for the enabling pin of the power integrated circuit IC;
The other end of the fourth resistor is electrically connected with one end of the first resistor and the first pin of the power integrated circuit IC respectively.
7. The undervoltage protection circuit of claim 2, wherein the first resistor has a resistance of 49 kiloohms and the second resistor has a resistance of 1 kiloohm.
8. The undervoltage protection circuit of claim 1, further comprising:
And if the level signal output by the filtering component is smaller than the level signal preconfigured on the enabling pin of the power supply integrated circuit IC, disconnecting the load circuit connected with the power supply integrated circuit IC.
9. An under-voltage protection system applied to an electric vehicle controller, comprising: the under-voltage protection circuit, power supply component, and load circuit of any one of claims 1-8; wherein,
The power supply component is connected with the undervoltage protection circuit in parallel;
The load circuit is electrically connected with the power supply integrated circuit IC of the undervoltage protection circuit.
10. The undervoltage protection system of claim 9, wherein the power supply component comprises a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322154170.2U CN220857648U (en) | 2023-08-10 | 2023-08-10 | Under-voltage protection circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322154170.2U CN220857648U (en) | 2023-08-10 | 2023-08-10 | Under-voltage protection circuit and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220857648U true CN220857648U (en) | 2024-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322154170.2U Active CN220857648U (en) | 2023-08-10 | 2023-08-10 | Under-voltage protection circuit and system |
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| Country | Link |
|---|---|
| CN (1) | CN220857648U (en) |
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2023
- 2023-08-10 CN CN202322154170.2U patent/CN220857648U/en active Active
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