CN113933742A - Switch identification circuit and electric device - Google Patents
Switch identification circuit and electric device Download PDFInfo
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- CN113933742A CN113933742A CN202010605067.3A CN202010605067A CN113933742A CN 113933742 A CN113933742 A CN 113933742A CN 202010605067 A CN202010605067 A CN 202010605067A CN 113933742 A CN113933742 A CN 113933742A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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Abstract
The application discloses switch identification circuit, including identification element, detecting element, the control unit, the linkage unit, first link and second link. The identification unit is electrically connected to the first connection end and the second connection end and used for providing a conductive loop when the first connection end and the second connection end are in short circuit. The detection unit is electrically connected to the first connection end and the second connection end, detects the voltage of the first connection end and the second connection end, and outputs a first detection signal and a second detection signal. The connection unit is electrically connected to a power supply device for providing a driving voltage to the first connection end and the second connection end. The control unit is used for determining whether the first connecting end is in short circuit with the second connecting end according to the received first detection signal and the second detection signal. If the two connecting ends are in short circuit, the control unit outputs a connection enabling signal to the connecting unit, and the connecting unit controls the power supply device to stop providing the driving voltage. The application discloses electric actuator, includes aforementioned switch identification circuit.
Description
Technical Field
The application relates to the field of circuits, in particular to a switch identification circuit and an electric device.
Background
When the automobile is started, the power supply device can output a power supply signal to the starting motor, so that the starting motor can finish ignition to start the automobile. In this process, a switch identification circuit is required to identify the connection state of the load device to ensure stable and safe starting of the vehicle engine.
At present, most switch identification circuit can adopt triode or opto-coupler discernment detection circuitry to discern load device's the signal of telecommunication and whether satisfy the automobile starting requirement with the connection state of judging load device, however, because triode or opto-coupler discernment detection circuitry need have a minimum opening voltage value just to enable the electric charge to pass through, this just makes this kind of switch identification circuit unable discernment to the short-circuit condition, has reduced the security of automobile in the start-up process.
Disclosure of Invention
In order to solve the foregoing problems, an embodiment of the present application provides a switch identification circuit, including an identification unit, a detection unit, a control unit, a connection unit, a first connection end and a second connection end, where the identification unit is electrically connected to the first connection end and the second connection end, and is configured to provide a conductive loop when the first connection end and the second connection end are short-circuited; the detection unit is electrically connected to the first connection end and the second connection end, respectively detects the voltages of the first connection end and the second connection end, and correspondingly outputs a first detection signal and a second detection signal; the control unit is electrically connected to the detection unit and the connection unit, and is configured to receive the first detection signal and the second detection signal, and determine whether the first connection end is in short circuit with the second connection end according to the first detection signal and the second detection signal, the connection unit is electrically connected to a power supply device, and the power supply device is configured to provide a driving voltage to the first connection end and the second connection end; if the first connecting end and the second connecting end are in short circuit, the control unit outputs a connection enabling signal to the connecting unit, and the connecting unit controls the power supply device to stop providing the driving voltage.
An embodiment of the present application provides an electric device, including the aforementioned switch identification circuit, a power supply device, and a load device, wherein the power supply device is electrically connected to the load device, and is configured to drive the load device to start when the power supply device and the load device form a conductive loop; the switch identification circuit is electrically connected to the power supply device and is used for enabling the power supply device and the load device to form a conductive loop when a connection unit in the switch identification circuit controls the power supply device to provide driving voltage to the first connection end and the second connection end under the action of a connection enabling signal.
Compared with the prior art, the switch identification circuit disclosed in the embodiment of the application can control the power supply device to stop providing the driving voltage to the load device when the first identification end and the second identification end are directly or indirectly short-circuited by detecting the voltage at the first connection end and the second connection end. Therefore, compared with a detection mode adopting a triode or optocoupler identification detection circuit, the switch identification circuit provided by the embodiment of the application can accurately identify whether the first connection end and the second connection end are in a short circuit dangerous state, so that the load connected with the first connection end and the second connection end has higher safety in the starting process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a switch identification circuit disclosed in an embodiment of the present application;
FIG. 2 is a schematic diagram of a specific circuit of an identification unit in the switch identification circuit shown in FIG. 1;
FIG. 3 is a schematic diagram of a specific circuit of a second detecting unit in the switch identification circuit shown in FIG. 1;
fig. 4 is a schematic structural diagram of a specific circuit of a connection unit in the switch identification circuit shown in fig. 1.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
When the automobile is started, the battery jar equipment in the automobile can output power signals to the starting motor of the automobile, so that the starting motor can finish ignition starting according to the power signals. If the storage battery equipment has a problem or the connection with the starting motor has a fault, the normal starting of the starting motor of the automobile is influenced, and the safety of the automobile in the starting process is reduced.
Therefore, the battery device and the connection mode of the battery device and the starting motor need to be detected before the automobile is started, so that the automobile is ensured to have higher safety in the starting process.
The embodiment of the application discloses switch identification circuit for detecting the connection mode of a power supply device including a storage battery device and a load device including a starting motor before starting an automobile, so that the load device can be started on the premise that the connection mode of the power supply device and the load device meet the starting requirement.
Please refer to fig. 1, which is a schematic structural diagram of a switch identification circuit according to an embodiment of the present application. As shown in fig. 1, the switch recognition circuit 100 includes a control unit 101, a recognition unit 102, a battery unit 103, a detection unit 104, and a connection unit 105.
The control unit 101 is electrically connected to the identification unit 102, and configured to output an identification enable signal to the identification unit 102, so that the identification unit 102 enters the identification state under control of a first potential in the identification enable signal, and the identification unit 102 exits the identification state under control of a second potential in the identification enable signal.
The identification unit 102 is electrically connected to the first connection end N1 and the second connection end N2, and configured to receive the voltage at the first connection end N1 as a first identification signal, receive the voltage at the second connection end N2 as a second identification signal, and transmit the first identification signal and the second identification signal to the detection unit 104. The first connection end N1 is electrically connected to the positive electrodes of the power supply device 200 and the load device 300, the second connection end is electrically connected to the negative electrodes of the power supply device 200 and the load device 300, and the power supply device 200 is configured to drive the load device 300 to start operation.
The detection unit 104 includes a first detection unit 1041 and a second detection unit 1042.
The first detecting unit 1041 is electrically connected to the control unit 101, and is configured to receive the first identification signal output by the identifying unit 102, and output the first detection signal to the control unit 101 after performing voltage division processing on the first identification signal, where the voltage division processing is to convert the first identification signal into a first detection signal that meets a voltage division relationship in the first detecting unit 1041, and the voltage division relationship is determined by a resistance value and a connection relationship of resistors in the first detecting unit 1041.
The second detecting unit 1042 is electrically connected to the control unit 101, and configured to receive the second identification signal output by the identifying unit 102, and output the second detection signal to the control unit 101 after performing voltage division processing on the second identification signal.
The control unit 101 is configured to receive the first detection signal and the second detection signal, perform difference operation on the first detection signal and the second detection signal to obtain a detection difference, compare the detection difference with a detection threshold, and output a connection enable signal to the second detection unit 1042 and the connection unit 105.
Optionally, the control unit 101 may further calculate a value of the first identification signal according to a voltage division relationship between the first detection signal and the first identification signal, and similarly, may obtain a value of the second identification signal, and the control unit 101 performs a difference operation on the calculated first identification signal and the calculated second identification signal, then takes a result obtained by the difference operation as an identification difference, compares the identification difference with an identification threshold, and outputs a connection enable signal to the second detection unit 1042 and the connection unit 105.
In this embodiment, if the detection difference is greater than the detection threshold, the control unit 101 outputs the second potential in the identification enable signal to enable the identification unit 102 to exit from the identification state, and outputs the first potential in the connection enable signal to the second detection unit 1042 and the connection unit 105 to enable the second detection unit 1042 to enter the current detection state, and to enable the connection unit 105 to enter the conduction state.
In this embodiment, if the detection difference is smaller than the detection threshold, the control unit 101 continues to output the first potential in the identification enable signal to keep the identification unit 102 in the identification state, and outputs the second potential in the connection enable signal to the second detection unit 1042 and the connection unit 105, so that the second detection unit 1042 continues to be in the voltage detection state, and the connection unit 105 enters the cut-off state.
Specifically, if the detection difference is zero, the voltage at the first identification terminal S1 is the same as the voltage at the second identification terminal S2, which indicates that the first identification terminal S1 and the second identification terminal S2 are short-circuited, the control unit 101 outputs the second potential of the connection enable signal to the connection unit 105, and the connection unit 105 is in a cut-off state; if the detection difference value is a negative value, the voltage at the first identification end S1 is less than the voltage at the second identification end S2, which indicates that the first identification end S1 is connected to the second connection end N2 and the second identification end S2 is connected to the first connection end N1, the control unit 101 outputs the second potential of the connection enable signal to the connection unit 105, and the connection unit 105 is in a cut-off state; if the detection difference is a positive value and smaller than the detection threshold, the representation power supply device 200 is in a low-voltage state, the control unit 101 outputs the second potential of the connection enable signal to the connection unit 105, and the connection unit 105 is in a cut-off state.
The connection unit 105 is electrically connected to the control unit 101, and configured to receive a connection enable signal output by the control unit 101, and enter an on state under the action of a first potential in the connection enable signal, and enter an off state under the action of a second potential in the connection enable signal.
The connection unit 105 is further electrically connected to the power supply device 200, and is configured to enable the power supply device 200, the load device 300 and the connection unit 105 to form a conductive loop when the connection unit is in a conducting state, and the power supply device 200 can output a power signal to the load device 300 to enable the load device 300 to complete the start-up; the connection unit 105 is also used to disable the power supply device 200, the load device 300, and the connection unit 105 from forming a conductive loop when in the off state, so that the load device 300 cannot be activated.
The battery unit 103 is electrically connected to the first connection end N1, and is configured to maintain a voltage at the first connection end N1, and can still maintain a voltage difference between the first connection end N1 and the second connection end N2 in the absence of the power supply apparatus 200, so as to complete identification of the voltages at the first connection end N1 and the second connection end N2 when the identification unit 102 is in the identification state.
The connection unit 105 is further electrically connected to the battery unit 103, and is configured to enable the battery unit 103, the load device 300, and the connection unit 105 to form a conductive loop when the battery unit 103 is in a conducting state and the power supply device 200 is absent in the circuit, and the battery unit 103 can output battery power to the load device 300 to enable the load device 300 to complete the startup.
The connection unit 105 is further electrically connected to the second detection unit 1042, and is configured to enable the second detection unit 1042 to enter a current detection state when the control unit 101 outputs the first potential in the connection enable signal and enable the connection unit 105 to enter a conducting state, so as to output a current signal in a conducting loop formed by the power supply device 200, the load device 300, and the connection unit 105 to the second detection unit 1042, where the second detection unit 1042 outputs the current signal to the control unit 101.
The control unit 101 is further configured to receive the current signal output by the second detecting unit 1042, and adjust the connection enable signal output to the second detecting unit 1042 and the connecting unit 105 from the first potential to the second potential after the current signal exceeds the current threshold, and the connecting unit 105 enters an off state, so that the power supply device 200, the load device 300, and the connecting unit 105 cannot form a conductive loop, and the load device 300 stops operating.
In the embodiment of the present application, the switch identification circuit 100 can identify the state of the power supply device 200 and the connection state of the power supply device 200 and the load device 300 through the cooperation of the identification unit 102 and the battery unit 103, the control unit 101 outputs the first potential in the connection enable signal to the connection unit 105 to enable the connection unit 105 to enter the conducting state when the state of the power supply device 200 and the connection state of the power supply device 200 and the load device 300 meet the start requirement, and thereafter, the power supply device 200 electrically connected to the connection unit 105 can form a conductive loop with the load device 300 and output the power signal to the load device 300 to complete the start of the load device 300.
In the embodiment of the present application, the states of the power supply device 200 include three states, i.e., a voltage level, a low voltage and a loss. The connection state of the power supply device 200 and the load device 300 includes three states of positive connection, reverse connection and short circuit. The activation request means that the connection state is positive and the power supply device 200 is in a voltage-indicating or absence state.
In this embodiment of the application, the control Unit 101 may be a Micro Controller Unit (MCU), a Field Programmable Gate Array (FPGA), or another integrated circuit capable of controlling subsequent units, which is not specifically limited in this embodiment of the application.
Please refer to fig. 2, which is a schematic structural diagram of an embodiment of an identification unit in the switch identification circuit shown in fig. 1. As shown in fig. 2, the recognition unit 102 includes a first recognition terminal S1, a second recognition terminal S2, and a first transistor Q1.
The first identification terminal S1 is electrically connected to the first connection terminal N1, and the second identification terminal S2 is electrically connected to the second connection terminal N2, wherein the power supply device 200 and the load device 300 are connected in parallel between the first connection terminal N1 and the second connection terminal N2.
The first detecting unit 1041 is electrically connected to the first identification terminal S1, and is configured to receive the voltage signal at the first identification terminal S1 as a first identification signal.
The second detecting unit 1042 is electrically connected to the second identification terminal S2, and is configured to receive the voltage signal at the second identification terminal S2 as a second identification signal.
The first identification terminal S1 is further electrically connected to the battery unit 103, and is used for receiving the identification voltage signal output by the battery unit 103, so that the first identification terminal S1 and the second identification terminal S2 can still have a potential difference when the power supply device 200 is absent in the circuit.
The first resistor R1 is electrically connected between the first identification terminal S1 and the second identification terminal S2, and the resistance value of the first resistor R1 is between 100 and 200 kilo-ohms, so that the current flowing through the first resistor R1 is extremely small, which is equivalent to open circuit.
The drain of the first transistor Q1 is electrically connected to the second identification terminal S2 through the second resistor R2, the source of the first transistor Q1 is electrically connected to the ground GND, the gate of the first transistor Q1 is electrically connected to the identification enable signal output terminal (not shown) of the control unit 101 through the third resistor R3, and the gate of the first transistor Q1 is also electrically connected to the ground GND through the fourth resistor R4.
Furthermore, the resistance value of the third resistor R3 is much smaller than that of the fourth resistor R4, that is, if the voltage value of the first potential of the identification enable signal output by the control unit 101 is 5V, the voltage value of the first potential divided by the fourth resistor R4 and input to the gate of the first transistor Q1 is only slightly smaller than 5V without affecting the on state of the first transistor Q1, and when the identification enable signal is switched from the first potential to the second potential, the charge remaining at the gate of the first transistor Q1 can be pulled down by the ground GND of the fourth resistor R4, so that the speed of the first transistor Q1 entering the off state can be increased compared with waiting for the natural depletion of the remaining charge.
In the embodiment of the present application, the first transistor Q1 is turned on by the first potential in the identification enable signal output by the control unit 101, and the identification unit 102 enters the identification state. That is, after the first transistor Q1 is turned on, the first identification terminal S1, the second identification terminal S2, the second resistor R2, the first transistor Q1 and the ground GND form a conductive loop, the first detection unit 1041 and the second detection unit 1042 can receive the potential signals at the first identification terminal S1 and the second identification terminal S2, and then the control unit 101 can determine the state of the power supply apparatus 200 and the connection states of the two identification terminals and the two connection terminals according to the potential signals at the two positions.
In the embodiment of the present application, the states of the power supply device 200 include three states, i.e., a voltage level, a low voltage and a loss. The connection state of the two identification ends and the two connecting ends comprises three states of positive connection, reverse connection and short connection.
Further, the positive connection refers to that the first identification terminal S1 is connected to the first connection terminal N1, the second identification terminal S2 is connected to the second connection terminal N2, and when the power supply apparatus 200 is not missing, a voltage difference between the first identification terminal S1 and the second identification terminal S2 can indicate whether a voltage value in the power supply apparatus 200 is at a normal voltage or a low voltage, that is, if the voltage difference is lower than a voltage threshold, the power supply apparatus is in a positive connection low voltage state, and if the voltage difference is higher than the voltage threshold, the power supply apparatus is in a positive connection normal voltage state; when the power supply device 200 is absent, the load device 300 is connected between the first identification terminal S1 and the second identification terminal S2 as a resistor, and divides the voltage with the second resistor R2, and is in a positive power-on/power-off state, but due to the identification voltage output by the battery unit 103, the voltage difference between the first identification terminal S1 and the second identification terminal S2 can still meet the requirement of the control unit 101, and the connection unit 105 enters a conducting state.
Further, the reverse connection means that the first identification terminal S1 is connected to the second connection terminal N1, and the second identification terminal is connected to the first connection terminal N1, when the power supply device 200 is not missing, the voltage at the second identification terminal S2 is significantly greater than the voltage at the first identification terminal S1 no matter whether the power supply device is in a standard voltage state or a low voltage state. When the power supply device 200 is absent, the load device 300 is connected between the first identification terminal S1 and the second identification terminal S2 as a resistor, so that the voltages at the first identification terminal S1 and the second identification terminal S2 are the same and are in a short-circuit state.
Further, the short circuit means that the first identification terminal S1 is directly connected to the second identification terminal S2, so that the two voltages are the same and in another short circuit state.
In combination with the above-mentioned states of the power supply device 200 and the connection states of the two identification terminals and the two connection terminals, the switch identification circuit 200 can identify a short circuit state including reverse connection without power supply and short circuit, a fault state including reverse connection with power supply and forward connection with low voltage, and a standard state including forward connection with voltage reference and forward connection without power supply by the first detection unit 1041 and the second detection unit 1042 for detecting the voltage values at the first identification terminal S1 and the second identification terminal S2. Wherein, only in the standard state, the control unit 101 controls the connection unit 105 to enter the conducting state.
Please refer to fig. 3, which is a schematic structural diagram of a specific circuit of the second detecting unit in the switch identification circuit shown in fig. 1. As shown IN fig. 3, the second detecting unit 1042 includes a first input terminal IN1, a first output terminal OUT1, a zener diode D1, a capacitor C1, and a second transistor Q2.
The anode of the zener diode D1 is electrically connected to the ground GND, the cathode of the zener diode D1 is electrically connected to the first output terminal OUT1, the first output terminal OUT1 is electrically connected to the signal receiving terminal of the control unit 101, and the first output terminal OUT1 is configured to output a first detection signal when the second detection unit 1042 does not enter the current detection state, and is further configured to output a current signal when the second detection unit 1042 enters the current detection state.
The fifth resistor R5 is electrically connected between the voltage dividing node a and the first output terminal OUT1, the sixth resistor R6 is electrically connected between the voltage dividing node a and the ground terminal GND, the seventh resistor R7 is electrically connected between the voltage dividing node a and the first input terminal IN1, and the first input terminal IN1 is electrically connected to the identification unit 102 and the connection unit 105, and is configured to receive the second identification signal and the current signal.
The capacitor C1 is electrically connected between the ground GND and the first output terminal OUT 1.
The source of the second transistor Q2 is electrically connected to the first input terminal IN1, the drain of the second transistor Q2 is electrically connected to the voltage dividing node a, the gate of the second transistor Q2 is electrically connected to the connection enable signal output terminal (not shown) of the control unit 101 through the eighth resistor R8, and the gate of the second transistor Q2 is also electrically connected to the ground terminal GND through the ninth resistor R9.
In the embodiment of the present application, when the identifying unit 102 is in the identifying state under the action of the first potential of the identification enable signal output by the control unit 101, the second transistor Q2 is also in the off state under the action of the second potential of the connection enable signal output by the control unit 101, that is, the second detecting unit 1042 is in the voltage detecting state at this time. The first input terminal IN1 receives the first identification signal output by the identification unit 102, the second detection unit 1042 outputs the first detection signal to the control unit 101 via the first output terminal OUT1 after performing voltage division processing on the first identification signal, and the voltage division relationship between the first identification signal and the first detection signal is determined by the resistance values and the connection relationship of the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7. Then, the control unit 101 performs difference processing on the received first detection signal and the second detection signal to obtain a detection difference, and then compares the detection difference with the detection threshold, only when the detection difference is greater than the detection threshold, the control unit 101 adjusts the connection enable signal output to the gate of the second transistor Q2 and the connection unit 105 from the second potential to the first potential, so that the connection unit 105 and the second transistor Q2 IN the second detection unit 1042 enter a conducting state, meanwhile, the identification unit 102 also exits the identification state under the action of the identification enable signal output by the control unit 101 to stop outputting the first identification signal, and at this time, the first input terminal IN1 receives the current signal output by the connection unit 105.
In this embodiment, the circuit structure of the first detecting unit 1041 is similar to that of the second detecting unit 1042, but the first detecting unit 1041 lacks the second transistor Q2 for switching between the voltage detection state and the current detection state as in the second detecting unit 1042, and the first detecting unit 1041 only functions to output the second detecting signal to the control unit 101 after performing voltage division processing on the received second identification signal.
Please refer to fig. 4, which is a schematic diagram illustrating a specific circuit structure of a connection unit in the switch identification circuit shown in fig. 1. As shown IN fig. 4, the connection unit 105 includes a first loop terminal J1, a second loop terminal J2, a second input terminal IN2, and a plurality of connection sub-units.
The second input terminal IN2 is electrically connected to the control unit 101, and is configured to receive a connection enable signal output by the control unit 101, where the connection enable signal is used to control on/off of a plurality of connection sub-units IN the connection unit 105, and the on/off states of the plurality of connection sub-units are on/off states of the connection unit 105.
The first loop terminal J1 is electrically connected to the battery unit 103, and is configured to enable the battery unit 103 and the load device 300 to form a conductive loop when the plurality of connection sub-units are in a conductive state, so that the load device 300 can receive a battery signal output by the battery unit 103 to start.
The second loop terminal J2 is electrically connected to the power supply device 200, and is configured to enable the power supply device 200 and the load device 300 to form a conductive loop when the plurality of connection sub-units are in a conductive state, so that the load device 300 can be started by receiving a power signal output by the power supply device 200.
The plurality of connection sub-units are electrically connected between the first loop end J1 and the second loop end J2.
The structures of the plurality of connection subunits are similar, and the structure of each connection subunit is described in detail in the application by taking one connection subunit as an example.
The connection subunit includes a third transistor Q3 and a fourth transistor Q4.
The gate of the third transistor Q3 is electrically connected to the second input terminal IN2 through the twelfth resistor R12, the source of the third transistor Q3 is electrically connected to the first circuit terminal J1, and the drain of the third transistor Q3 is electrically connected to the ground terminal GND.
The gate of the fourth transistor Q4 is electrically connected to the second input terminal IN2 through the thirteenth resistor R13, the source of the fourth transistor Q4 is electrically connected to the second loop terminal J2, and the drain of the fourth transistor Q4 is electrically connected to the ground terminal GND.
In the embodiment of the present application, the connection unit 105 includes three connection subunits, and the three connection subunits work in parallel, that is, after one of the connection subunits is damaged, other connection subunits can continue to work, and the current transmission capability of the connection unit 105 can also be improved. It is understood that the number of the connection sub-units in the connection unit 105 may be increased or decreased according to actual needs, and this is not particularly limited in the embodiment of the present application.
In the embodiment of the present application, the battery unit 103 connected to the first loop terminal J1 and the power supply device 200 connected to the second connection terminal can both start the load device 300 when forming a conductive loop with the load device 300. That is, the battery unit 103 in the switch recognition circuit 100 provided by the present application can enable the load device 300 to be successfully started even when the power supply device 200 including the battery device is absent in the automobile.
IN the embodiment of the present application, the connection unit 105 is switched between the on state and the off state by the connection enable signal input from the second input terminal IN 2. That is, if the connection unit 105 receives the first potential of the connection enable signal, the transistors in the connection unit 105 are turned on, that is, the connection sub-units enter the on state, and the battery unit 103 and the power supply device 200 electrically connected to the first loop terminal J1 and the second loop terminal J2 form a conductive loop with the load device 300, so that the load device 300 is activated. If the connection unit 105 receives the second potential of the connection enable signal, the transistors in the connection unit 105 are turned off, that is, the connection sub-units enter an off state, and the battery unit 103 and the power supply device 200 electrically connected to the first loop terminal J1 and the second loop terminal J2 cannot form a conductive loop with the load device 300, so that the load device 300 stops operating.
Compared with the prior art, the switch identification circuit 100 disclosed in the embodiment of the present application can control the power supply device 200 to stop providing the driving voltage to the load device 300 when the first identification terminal S1 and the second identification terminal S2 are directly or indirectly shorted by detecting the voltages at the first connection terminal N1 and the second connection terminal N2. It can be seen that, compared with the detection mode using the triode or the optocoupler identification detection circuit, the switch identification circuit 100 provided in the embodiment of the present application can accurately identify whether the first connection end and the second connection end are in a short circuit dangerous state, so that the load device 300 connected to the first connection end and the second connection end has higher safety in the starting process.
The switch identification circuit and the electric device disclosed in the embodiments of the present application are described in detail above, and the principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (11)
1. A switch identification circuit is characterized by comprising an identification unit, a detection unit, a control unit, a connection unit, a first connection end and a second connection end, wherein,
the identification unit is electrically connected to the first connecting end and the second connecting end and used for providing a conductive loop when the first connecting end and the second connecting end are in short circuit;
the detection unit is electrically connected to the first connection end and the second connection end, respectively detects the voltages of the first connection end and the second connection end, and correspondingly outputs a first detection signal and a second detection signal;
the control unit is electrically connected to the detection unit and the connection unit, and is configured to receive the first detection signal and the second detection signal, and determine whether the first connection end is in short circuit with the second connection end according to the first detection signal and the second detection signal, the connection unit is electrically connected to a power supply device, and the power supply device is configured to provide a driving voltage to the first connection end and the second connection end;
if the first connecting end and the second connecting end are in short circuit, the control unit outputs a connection enabling signal to the connecting unit, and the connecting unit controls the power supply device to stop providing the driving voltage.
2. The switch identification circuit of claim 1, wherein said determining whether the first connection is shorted to the second connection based on the first detection signal and the second detection signal comprises:
the control unit performs difference operation processing on the first detection signal and the second detection signal to obtain a detection difference,
if the detection difference value is zero, the first connecting end and the second connecting end are in short circuit, the control unit outputs the connection enabling signal to the connecting unit, and the connecting unit controls the power supply device to stop providing the driving voltage.
3. The switch identification circuit of claim 2,
if the detection difference value is a negative value, the first connecting end and the second connecting end are reversely connected, the control unit outputs the connection enabling signal to the connecting unit, and the connecting unit controls the power supply device to stop providing the driving voltage;
if the detection difference value is a positive value and is smaller than a detection threshold value, the power supply device is in a low-voltage state, the control unit outputs the connection enabling signal to the connection unit, and the connection unit controls the power supply device to stop providing the driving voltage;
if the detection difference value is a positive value and is greater than the detection threshold value, the control unit outputs the connection enabling signal to the connection unit, and the connection unit controls the power supply device to provide the driving voltage to the first connection end and the second connection end.
4. The switch identification circuit according to claim 1, wherein the detection unit is further electrically connected to the connection unit, and configured to receive a current signal output from the connection unit when the connection unit controls the power supply device to provide the driving voltage to the first connection end and the second connection end, and transmit the current signal to the control unit, where the current signal is a current when the power supply device drives a load device electrically connected to the first connection end and the second connection end to start operation;
the control unit is used for receiving the current signal, comparing the current signal with a current threshold value, and outputting a connection enabling signal to the connection unit according to a comparison result, wherein the enabling signal controls the connection unit to control the power supply device to provide or stop providing the driving voltage.
5. The switch identification circuit according to claim 4, wherein the comparing the current signal with a current threshold and outputting a connection enable signal to the connection unit according to the comparison result, the enable signal controlling the connection unit to control the power supply device to provide or stop providing the driving voltage comprises:
the control unit compares the current signal to the current threshold,
if the current signal is smaller than the current threshold, the control unit outputs the connection enabling signal to the connection unit, and the connection unit controls the power supply device to provide the driving voltage according to the connection enabling signal;
if the current signal is greater than or equal to the current threshold, the control unit outputs the connection enabling signal to the connection unit, and the connection unit controls the power supply device to stop providing the driving voltage according to the connection enabling signal.
6. The switch identification circuit according to claim 1, wherein the detection unit comprises a first detection unit and a second detection unit, wherein,
the first detection unit is electrically connected to the first connection end and the control unit, and is used for receiving the voltage at the first connection end as a first identification signal, processing the first identification signal and outputting a first detection signal to the control unit;
the second detection unit is electrically connected to the second connection end and the control unit, and is configured to receive the voltage at the second connection end as a second identification signal, process the second identification signal, and output a second detection signal to the control unit;
the second detection unit is electrically connected to the connection unit, and is configured to receive the current signal output from the connection unit when the connection unit controls the power supply device to provide the driving voltage to the first connection end and the second connection end, and output the current signal to the control unit.
7. The switch identification circuit of claim 1, further comprising a battery cell,
the battery unit is electrically connected to the first connection end and used for maintaining the voltage at the first connection end, so that a voltage difference exists between the voltage at the first connection end and the voltage at the second connection end;
the battery unit is also electrically connected to the connection unit and used for outputting or stopping outputting the driving voltage to the first connection end and the second connection end under the control of the connection unit.
8. The switch identification circuit of claim 1, wherein the identification cell comprises a first identification terminal, a second identification terminal, and a first transistor, wherein,
the first identification end is electrically connected to the first connecting end, and the second identification end is electrically connected to the second connecting end;
the first detection unit is electrically connected to the first identification end and used for receiving the voltage at the first identification end as the first identification signal, and the second detection unit is electrically connected to the second identification end and used for receiving the voltage at the second identification end as the second identification signal;
the battery unit is electrically connected to the first identification end and used for enabling the first identification end and the second identification end to have voltage difference when the power supply device is absent in the circuit;
the first resistor is electrically connected between the first identification end and the second identification end;
the drain of the first transistor is electrically connected to the second identification end through a second resistor, the source of the first transistor is electrically connected to a ground end, and the gate of the first transistor is electrically connected to the control unit through a third resistor;
if the gate of the first transistor enters a conducting state under the control of the identification enabling signal output by the control unit, the first identification end, the second resistor and the grounding end form a conducting loop.
9. The switch identification circuit according to claim 6, wherein the second detection unit comprises a first input terminal, a first output terminal, a zener diode, a capacitor, and a second transistor, wherein,
the anode of the zener diode is electrically connected to the ground terminal, the cathode of the zener diode is electrically connected to the first output terminal, the first output terminal is electrically connected to the control unit, and the first output terminal is configured to output the first detection signal when the second detection unit does not enter the current detection state, and is further configured to output the current signal when the second detection unit enters the current detection state;
the capacitor is electrically connected between the grounding end and the first output end;
the fifth resistor is electrically connected between a voltage division node and the first output end, the sixth resistor is electrically connected between the voltage division node and the ground terminal, the seventh resistor is electrically connected between the voltage division node and the first input end, and the first input end is electrically connected to the identification unit and the connection unit and is used for receiving the second identification signal and the current signal;
the source of the second transistor is electrically connected to the first input end, the drain of the second transistor is electrically connected to the voltage division node, and the gate of the second transistor is electrically connected to the control unit through an eighth resistor;
if the grid electrode of the second transistor enters a conducting state under the control of the connection enabling signal, the first input end receives the current signal; and if the connection enable signal enters a cut-off state under the control of the connection enable signal, the first input end receives the second identification signal.
10. The switch identification circuit of claim 1, wherein the connection unit comprises a first loop terminal, a second input terminal, and a plurality of connection subunits, wherein,
the second input end is electrically connected to the control unit and is used for receiving the connection enabling signal output by the control unit, and the connection enabling signal is used for controlling the connection or the disconnection of the plurality of connection sub-units;
the plurality of connecting subunits are electrically connected between the first loop end and the second loop end;
the first loop end is electrically connected to the battery unit and used for providing the voltage signal for a conductive loop formed by the first connection end and the second connection end when the plurality of connection subunits are in a conduction state;
the second loop end is electrically connected to the power supply device and is used for providing driving voltage for a conductive loop formed by the first connection end and the second connection end when the plurality of connection sub-units are in a conduction state.
11. An electric device comprising the switch identification circuit, the power supply device, and the load device according to any one of claims 1 to 10,
the power supply device is electrically connected to the load device and used for driving the load device to start when the power supply device and the load device form a conductive loop;
the switch identification circuit is electrically connected to the power supply device and is used for enabling the power supply device and the load device to form a conductive loop when a connection unit in the switch identification circuit controls the power supply device to provide driving voltage to the first connection end and the second connection end under the action of a connection enabling signal.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010605067.3A CN113933742A (en) | 2020-06-29 | 2020-06-29 | Switch identification circuit and electric device |
| PCT/CN2020/103039 WO2022000597A1 (en) | 2020-06-29 | 2020-07-20 | On/off identification circuit and electric device |
| CA3126465A CA3126465A1 (en) | 2020-06-29 | 2020-07-20 | Switch identification circuit and electric device |
| EP20942748.3A EP4174500A4 (en) | 2020-06-29 | 2020-07-20 | On/off identification circuit and electric device |
| US18/089,648 US20230133107A1 (en) | 2020-06-29 | 2022-12-28 | Switch identification circuit and electric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010605067.3A CN113933742A (en) | 2020-06-29 | 2020-06-29 | Switch identification circuit and electric device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113933742A true CN113933742A (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010605067.3A Pending CN113933742A (en) | 2020-06-29 | 2020-06-29 | Switch identification circuit and electric device |
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| Country | Link |
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| CN (1) | CN113933742A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089226A (en) * | 2022-01-18 | 2022-02-25 | 成都市安比科技有限公司 | Active load detection circuit with anti-static damage and controllable overcurrent protection functions |
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2020
- 2020-06-29 CN CN202010605067.3A patent/CN113933742A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089226A (en) * | 2022-01-18 | 2022-02-25 | 成都市安比科技有限公司 | Active load detection circuit with anti-static damage and controllable overcurrent protection functions |
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