CN117335789A - Isolation self-locking circuit and method - Google Patents
Isolation self-locking circuit and method Download PDFInfo
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- CN117335789A CN117335789A CN202311635743.1A CN202311635743A CN117335789A CN 117335789 A CN117335789 A CN 117335789A CN 202311635743 A CN202311635743 A CN 202311635743A CN 117335789 A CN117335789 A CN 117335789A
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- 238000000034 method Methods 0.000 title claims abstract description 23
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- 230000005669 field effect Effects 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 5
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017545—Coupling arrangements; Impedance matching circuits
- H03K19/017572—Coupling arrangements; Impedance matching circuits using opto-electronic devices
Abstract
The invention provides an isolation self-locking circuit and a method, when a circuit state is in an unlocking state, if a first voltage value obtained by dividing a detection voltage by a voltage dividing module is higher than a preset first voltage threshold value, the circuit state is switched and kept in the locking state by the self-locking module so as to ensure the safety and the reliability of the circuit; when the circuit state is in the locking state, if the first voltage value of the detection voltage after being divided by the voltage dividing module is lower than the preset second voltage threshold value and the unlocking condition is met, the self-locking module is enabled to switch and keep the circuit state in the unlocking state through the unlocking module, the convenience of the unlocking operation of the isolation self-locking circuit is improved, and the use experience of a user is improved.
Description
Technical Field
The invention relates to the field of isolation circuits, in particular to an isolation self-locking circuit and an isolation self-locking method.
Background
Isolation circuitry refers to the isolation of different parts or elements of a circuit to prevent mutual interference or coupling of currents or signals. Besides the isolation function, the isolation self-locking circuit has the self-locking function, can effectively lock the state of the circuit, can be applied to overvoltage protection, overcurrent protection, short-circuit protection and other scenes, and ensures the safety and reliability of the circuit. However, the unlocking operation of the isolation self-locking circuit generally needs to send an unlocking instruction manually, and the isolation self-locking circuit does not have a self-checking function, so that the use experience of a user is affected.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an isolated self-locking circuit and a method thereof, when a circuit state is in an unlocked state, if a first voltage value obtained by dividing a detection voltage by a voltage dividing module is higher than a preset first voltage threshold, the self-locking module switches and maintains the circuit state in a locked state, so as to ensure the safety and reliability of the circuit; when the circuit state is in the locking state, if the first voltage value of the detected voltage after being divided by the voltage dividing module is lower than the preset second voltage threshold value and the unlocking condition is met, the self-locking module is enabled to switch and keep the circuit state in the unlocking state through the unlocking module, and the use convenience is improved.
In a first aspect, the present invention provides a variety of isolated self-locking circuits, said circuits comprising:
the device comprises a voltage dividing module, an isolation module, a self-locking module and an unlocking module;
the voltage dividing module is used for dividing the detection voltage;
the isolation module is used for isolating the detection voltage;
the self-locking module is used for keeping the circuit state to be in a locking state or an unlocking state;
the unlocking module is used for switching the circuit state of the self-locking module from a locking state to an unlocking state;
when the first voltage value of the detected voltage divided by the voltage dividing module exceeds a preset first voltage threshold value, the voltage dividing module drives the isolation module, the isolation module enables the circuit state of the self-locking module to be switched into a locking state, and the self-locking module keeps the circuit state in the locking state;
when the first voltage value of the detected voltage divided by the voltage dividing module is lower than a preset second voltage threshold value, acquiring first time information, judging whether to drive the unlocking module according to the first time information, if yes, driving the unlocking module to enable a circuit of the self-locking module to be switched into an unlocking state, and keeping the circuit state to be the unlocking state by the self-locking module.
In this scheme, the partial pressure module includes:
a first resistor and a second resistor;
one end of the first resistor is connected to the detection voltage, and the other end of the first resistor is connected to the second resistor;
one end of the second resistor is connected to the first resistor, and the other end of the second resistor is connected to the ground as an acquisition point of the first voltage value.
In this scheme, the isolation module includes:
the first photoelectric coupler is used for isolating the input end and the output end;
the input end of the first photoelectric coupler is connected with the voltage dividing module;
the output end of the first photoelectric coupler is connected with the self-locking module and used for driving the self-locking module to switch the circuit state into a locking state.
In this scheme, the auto-lock module includes:
a first triode, a first field effect transistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;
the collector electrode and the emission stage of the first triode are respectively connected with two ends of the output end of the isolation module; one end of the output end of the isolation module is connected to a driving power supply, and the other end of the output end of the isolation module is connected to the first end of the third resistor; the base of the first triode is connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor is connected to a driving power supply, and the other end of the sixth resistor is connected to the drain electrode of the first field effect transistor; the second end of the third resistor is connected to the grid electrode of the first field effect transistor and one end of the fourth resistor, and the other end of the fourth resistor is grounded; and the source stage of the first field effect transistor is grounded.
In this scheme, the unblock module includes:
a second triode and a seventh resistor;
the base electrode of the second triode is connected with one end of a seventh resistor, and the other end of the seventh resistor is connected to a control signal; the collector electrode of the second triode is connected to the grid electrode of the first field effect tube; and the emitting stage of the second triode is grounded.
The second aspect of the invention provides an isolated self-locking method, comprising:
acquiring circuit state information of the self-locking module, and if the circuit state information is in a locking state;
acquiring first voltage information, and judging whether the first voltage information is lower than a preset second voltage threshold value;
if yes, acquiring first time information, and judging whether to execute unlocking operation according to the first time information;
if yes, an unlocking signal is sent to the unlocking module.
In this scheme, whether judge whether carry out the unblock operation according to the first time information specifically is:
starting a first timer and recording first time information;
judging whether the first voltage information is higher than a preset second voltage threshold value or not;
if yes, closing the first timer, and stopping recording the first time information;
if not, judging whether the first time information exceeds a preset time threshold value;
if yes, unlocking operation is executed.
In this scheme, send unlocking signal to unlocking module, specifically do:
the unlocking signal is a high-level signal with preset duration;
the unlock signal is sent and then switched to a low level.
In this scheme, still include:
acquiring temperature information of a circuit;
judging whether the temperature information exceeds a preset temperature threshold value or not;
in this scheme, still include:
acquiring resistance information of a digital resistor;
and adjusting the resistance information of the digital resistor according to the resistance information and a preset communication instruction.
The invention provides an isolation self-locking circuit and a method, when a circuit state is in an unlocking state, if a first voltage value obtained by dividing a detection voltage by a voltage dividing module is higher than a preset first voltage threshold value, the circuit state is switched and kept in the locking state by the self-locking module so as to ensure the safety and the reliability of the circuit; when the circuit state is in the locking state, if the first voltage value of the detection voltage after being divided by the voltage dividing module is lower than the preset second voltage threshold value and the unlocking condition is met, the self-locking module is enabled to switch and keep the circuit state in the unlocking state through the unlocking module, the convenience of the unlocking operation of the isolation self-locking circuit is improved, and the use experience of a user is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be considered as limiting the scope.
FIG. 1 shows a schematic diagram of an isolated self-locking circuit according to the present invention;
FIG. 2 is a schematic diagram of an isolated self-locking circuit according to an embodiment of the present invention;
FIG. 3 shows an unlocking flow chart of an isolated self-locking method provided by the invention;
fig. 4 shows a flowchart for determining an unlocking operation according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The terms "first," "second," and the like, as used in embodiments of the present invention, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Nor does the terms "a," "an," or "the" or similar terms mean a limitation of quantity, but rather that at least one is present. Likewise, the word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps preceding or following the methods of embodiments of the present invention are not necessarily performed in a sequential order. Rather, the various steps may be processed in reverse order or simultaneously. Also, other operations may be added to or removed from these processes.
In addition, functional modules in the embodiments of the present invention may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
Fig. 1 shows a schematic block diagram of an isolated self-locking circuit according to the present invention.
As shown in fig. 1, the present invention discloses an isolated self-locking circuit, which comprises:
the device comprises a voltage dividing module 101, an isolation module 102, a self-locking module 103 and an unlocking module 104;
the voltage dividing module 101 is configured to divide the detection voltage;
an isolation module 102 for isolating the detection voltage;
the self-locking module 103 is used for keeping the circuit state to be a locking state or an unlocking state;
the unlocking module 104 is used for switching the circuit state of the self-locking module from the locking state to the unlocking state;
when the first voltage value of the detected voltage divided by the voltage dividing module exceeds a preset first voltage threshold value, the voltage dividing module drives the isolation module, the isolation module enables the circuit state of the self-locking module to be switched into a locking state, and the self-locking module keeps the circuit state in the locking state;
when the first voltage value of the detected voltage divided by the voltage dividing module is lower than a preset second voltage threshold value, acquiring first time information, judging whether to drive the unlocking module according to the first time information, if yes, driving the unlocking module to enable a circuit of the self-locking module to be switched into an unlocking state, and keeping the circuit state to be the unlocking state by the self-locking module.
It should be noted that the voltage dividing module 101 performs a function of dividing a detection voltage, which is generally a high voltage that needs to be isolated, and includes an input terminal and an output terminal. The input end of the voltage dividing module 101 is connected to the detection voltage, and the output value after voltage division is used as the input of the isolation module 102 to drive the isolation module 102 to work. The isolation module 102 isolates the detection voltage circuit from the self-locking module circuit to prevent mutual coupling and interference of electrical signals, and comprises an input end and an output end. The input end of the isolation module 102 receives voltage driving from the voltage division module 101, and when the voltage of the input end of the isolation module 102 does not reach a driving voltage value, the output end of the isolation module 102 is in an off state; when the voltage of the input end of the isolation module 102 reaches the driving voltage value, the output end of the isolation module 102 is in a conducting state. The self-locking module 103 keeps the circuit state in a locked state or an unlocked state, i.e., the locking circuit of the self-locking module 102 is in an on state or an off state. When the output end of the isolation module 102 is in a conducting state, triggering the locking operation of the self-locking module 103 to enable the locking circuit to be in a conducting state; and the locking circuit is kept in a conducting state through the self-locking module 102, and the state of the output end of the isolation module 102 does not influence the circuit state of the self-locking module 102. After the unlocking module 104 sends a preset unlocking signal to the self-locking module 102, triggering the unlocking operation of the unlocking module 103 to enable the locking circuit of the unlocking module 102 to be in an off state; and the locking circuit is kept in an off state by the self-locking module 102, and at this time, the unlocking signal of the unlocking module 104 does not affect the circuit state of the self-locking module 102.
Fig. 2 shows a schematic diagram of an isolated self-locking circuit according to an embodiment of the present invention.
According to an embodiment of the present invention, as shown in fig. 2, the voltage division module circuit M21 includes:
a first resistor R1 and a second resistor R2;
one end of the first resistor R1 is connected to the detection voltage VOUT, and the other end is connected to the second resistor R2;
one end of the second resistor R2 is connected to the first resistor R1 as an acquisition point of the first voltage value, and the other end is connected to the ground GND.
The detection voltage is generally a high voltage that needs to be isolated, and the detection voltage needs to be divided to be a driving voltage of the isolation module circuit M22. The first resistor R1 and the second resistor R2 form a voltage dividing circuit in series, and since the currents of the resistors in the series circuit are equal, the sum of the voltages at two ends of the resistors is equal to the total circuit voltage, so that the first voltage value of the voltage dividing module circuit M21 can be calculated; wherein the first voltage value is a voltage value of a connection portion of the first resistor R1 and the second resistor, and is used for driving the isolation module circuit M22. For example, when the voltage value of the detection voltage is 10 volts, the resistance value of the first resistor R1 is 40 ohms, and the resistance value of the second resistor R2 is 10 ohms, the first voltage value of 2 volts is calculated.
According to an embodiment of the present invention, as shown in fig. 2, the isolation module circuit M22 includes:
the first photoelectric coupler U1 is used for isolating the input end and the output end;
the input end of the first photoelectric coupler is connected with the voltage dividing module;
the output end of the first photoelectric coupler is connected with the self-locking module and used for driving the self-locking module to switch the circuit state into a locking state.
The photoelectric coupler is an electro-optical conversion device which uses light as a medium to transmit an electric signal, generates an optical signal through the electric signal, and obtains the electric signal through the optical signal. The photoelectric coupler comprises a light-emitting source and a light receiver, wherein a pin of the light-emitting source is an input end of the photoelectric coupler, and is usually a light-emitting diode; the pins of the light receiver are the output ends of the photocoupler, usually a photodiode and a phototriode. When the light source does not emit light, the light receiver does not receive the light signal, and the output end is in a disconnected state; when the voltage signal at the input end is enough to drive the light emitting source to work, the light receiver receives the light signal from the light emitting source, and the output end is in a conducting state. When the output end is conducted, a locking signal is given to the self-locking module circuit M23, so that the state of the self-locking module switching circuit is a locking state.
According to an embodiment of the present invention, as shown in fig. 2, the self-locking module circuit M23 includes:
a first transistor Q1, a first field effect transistor CM1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6;
the collector electrode and the emission stage of the first triode Q1 are respectively connected with two ends of the output end of the isolation module; one end of the output end of the isolation module is connected to the driving power supply V1, and the other end of the output end of the isolation module is connected to the first end of the third resistor R3; a base stage of the first transistor Q1 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected to the driving power source V1, and the other end of the sixth resistor R6 is connected to the drain of the first field effect transistor CM 1; the second end of the third resistor R3 is connected to the gate of the first field effect transistor CM1 and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded GND; the source of the first fet CM1 is grounded GND.
It should be noted that, in the unlocked state, the first fet CM1 is in the off state, i.e., the source and the drain of the first fet CM1 are disconnected, and a current loop (V1-R5-R6-GND) cannot be formed between the driving power V1, the fifth resistor R5, the sixth resistor R6 and the ground GND, so that the first transistor Q1 is in the off state, i.e., the collector and the emitter of the first transistor are disconnected. Since Q1 is in the off state, the voltage at the connection point of the third resistor R3 and the fourth resistor R4, to which the gate of the first fet CM1 is connected, is low, and the function of maintaining the unlock state is achieved.
When the output end of the isolation module circuit M22 is in a conductive state, the driving power V1, the first photo-coupler U1, the third resistor R3, the fourth resistor R4 and the ground GND form a current loop (V1-U1-R3-R4-GND), and a sufficient voltage is provided for the gate of the first fet CM1, so that the drain and the source of the first fet CM1 are conductive, and the target voltage OVP is connected to the ground GND. Then, after the drain electrode and the source electrode of the first fet CM1 are turned on, the driving power V1, the fifth resistor R5, the sixth resistor R6, the first fet CM1 and the ground GND form a current loop (V1-R5-R6-CM 1-GND), so that a sufficient voltage is provided for the base electrode of the first fet Q1 to enable the collector electrode of the first fet Q1 to be turned on with the emission set, thereby forming a current loop (V1-Q1-R3-R4-GND) between the driving power V1, the first fet Q1, the third resistor R3, the fourth resistor R4 and the ground GND for maintaining the operating voltage of the gate electrode of the first fet CM 1; at this time, even if the output terminal of the isolation module circuit M22 is in an off state, the self-locking module circuit M23 can connect the target voltage OVP to the ground GND, that is, the effect of the locked state is achieved.
According to an embodiment of the present invention, as shown in fig. 2, the unlocking module circuit M24 includes:
a second transistor Q2 and a seventh resistor R7;
the base of the second triode Q2 is connected with one end of a seventh resistor R7, and the other end of the seventh resistor R7 is connected to a control signal CTRL; the collector electrode of the second triode Q2 is connected to the grid electrode of the first field effect tube; and the emitting stage of the second triode is grounded GND.
It should be noted that, when the self-locking module circuit M23 is unlocked by the unlocking module circuit M24, the output end of the isolation module circuit M21 needs to be preferentially ensured to be in an off state, so that the driving power V1 is prevented from being directly connected to the ground GND to form a short circuit due to the simultaneous conduction of the second triode Q2 and the output end of the isolation module circuit M21.
When the self-locking module circuit M23 is in the locked state, the control signal CTRL is set to be at a high level, so that the collector and the emitter of the second triode Q2 are conducted, and the fourth resistor R4 of the current loop (V1-Q1-R3-R4-GND) between the driving power supply V1, the first triode Q1, the third resistor R3, the fourth resistor R4 and the ground GND is shorted, i.e., the gate of the first field effect transistor CM1 is connected to the ground GND. After the gate of the first fet CM1 is connected to the ground GND, the source and the drain of the first fet CM1 are disconnected, and at this time, the target voltage OVP is released from the ground GND and switched to the unlock state. Since the source and drain of the first fet CM1 are in an off state, a current loop (V1-R5-R6-GND) cannot be formed between the driving power V1, the fifth resistor R5, the sixth resistor R6 and the ground GND, and thus the first transistor Q1 is in an off state, i.e., the collector and emitter of the first transistor are disconnected. Since Q1 is in the off state, the voltage at the connection point of the third resistor R3 and the fourth resistor R4, to which the gate of the first fet CM1 is connected, is low, and the function of maintaining the unlock state is achieved.
It is worth mentioning that the method further comprises:
the input of the first optocoupler is connected in series with a resistor.
It should be noted that, the input end of the first photocoupler is typically a light emitting source, such as a light emitting diode. The series resistor plays a role in limiting current, and the service life of the light-emitting source is prevented from being influenced by overlarge current.
It is worth mentioning that the method further comprises:
the target voltage is connected with the drain electrode of the first field effect transistor in series after being connected with the diode.
The target voltage is connected to the anode of the diode, and the cathode of the diode is connected to the drain of the first field effect transistor. The diode can effectively prevent the influence of the self-locking circuit on the target voltage in the unlocking state.
Fig. 3 shows an unlocking flow chart of an isolated self-locking method provided by the invention.
As shown in fig. 3, the second aspect of the present invention discloses the isolated self-locking method, which comprises the following steps:
s302, acquiring circuit state information of the self-locking module, and if the circuit state information is in a locking state;
s304, acquiring first voltage information, and judging whether the first voltage information is lower than a preset second voltage threshold value;
s306, if yes, acquiring first time information, and judging whether to execute unlocking operation according to the first time information;
and S308, if yes, sending an unlocking signal to the unlocking module.
It should be noted that, by acquiring the voltage value of the gate of the first field effect transistor CM1, the circuit state information of the self-locking module can be determined; if the voltage value of the grid electrode of the first field effect tube CM1 is not lower than the conduction threshold value of the field effect tube, the circuit of the self-locking module is in a locking state; if the voltage value of the grid electrode of the first field effect tube CM1 is lower than the conduction threshold value of the field effect tube, the circuit of the self-locking module is in an unlocking state.
When the circuit of the self-locking module is in a locking state, first voltage information is obtained, wherein the first voltage information is a driving voltage value of a light emitting source of a photoelectric coupler of the isolation module. In practical applications, the threshold voltage for driving the light emitting source to emit light is a first voltage threshold, and in order to avoid the light emitting source being at the light emitting operation critical point due to the unstable voltage, a second voltage threshold lower than the first voltage threshold is generally set for determining the unlock state. At this time, the problem that the first voltage information reaches the first voltage threshold after the unlock signal is sent, so that the second triode Q2 is simultaneously conducted with the output end of the isolation module circuit M21, and the driving power supply V1 is directly connected to the ground GND to form a short circuit can be avoided.
Recording first time information when the first voltage information is lower than a second voltage threshold value; wherein the first time information is a duration that the first voltage information is below the second voltage threshold. When the first time information is higher than the preset time threshold, the first voltage information is lower than the second voltage threshold and is stabilized, and the unlocking operation can be performed. Unlocking is completed by sending an unlocking signal to the unlocking module, i.e. setting the control signal CTRL to a high level.
Fig. 4 shows a flowchart for determining an unlocking operation according to an embodiment of the present invention.
According to an embodiment of the present invention, as shown in fig. 4, the determining whether to perform the unlocking operation according to the first time information is specifically:
s402, starting a first timer and recording first time information;
s404, judging whether the first voltage information is higher than a preset second voltage threshold value;
s406, if yes, closing the first timer, and stopping recording the first time information;
s408, if not, judging whether the first time information exceeds a preset time threshold;
and S410, if yes, executing unlocking operation.
When the first voltage information is detected to be lower than the second voltage threshold, the first timer is started to record the first time information. Continuously collecting first voltage information at preset time intervals, and judging whether the first voltage information is higher than a preset second voltage threshold value or not; if yes, closing a first timer, stopping recording first time information, and indicating that the first voltage is not stably lower than a second voltage threshold; if not, judging whether the first time information exceeds a preset time threshold. When the first time information exceeds a preset time threshold, it indicates that the first voltage information is lower than the second voltage threshold and has reached stability, in a state where an unlocking operation can be performed.
According to the embodiment of the invention, the sending of the unlocking signal to the unlocking module is specifically as follows:
the unlocking signal is a high-level signal with preset duration;
the unlock signal is sent and then switched to a low level.
It should be noted that, the unlock signal is a high level signal with a preset duration, that is, the control signal CTRL is switched back to a low level after being set to a high level for a preset duration. In practical applications, a high level signal of 100ms to 200ms is usually set. Under the condition of unlocking, the high level of the control signal CTRL is made to be as short as possible, namely the conduction time of the second triode is made to be short, and the probability of simultaneous conduction of the second triode and the photoelectric coupler can be reduced.
According to an embodiment of the present invention, further comprising:
acquiring temperature information of a circuit;
judging whether the temperature information exceeds a preset temperature threshold value or not;
if yes, the unlocking operation is forbidden.
When the unlocking operation is required to be executed, temperature information of the isolation self-locking circuit is acquired, wherein the temperature information is a temperature value reflecting components of the isolation self-locking circuit. When the temperature value of the component is higher than a preset temperature threshold value, the electrical parameters of the circuit influence the normal operation of the circuit. Therefore, when the temperature information is higher than the preset temperature threshold, the execution of the unlocking operation is forbidden, and the unlocking authority is limited. And releasing the unlocking authority until the temperature is lower than the temperature threshold value.
According to an embodiment of the present invention, further comprising:
acquiring resistance information of a digital resistor;
and adjusting the resistance information of the digital resistor according to the resistance information and a preset communication instruction.
It should be noted that the first resistor or the second resistor of the voltage dividing module may be a digitally adjustable varistor. The digital adjustable rheostat is a component capable of digitally adjusting the resistance value of the rheostat. And acquiring the resistance information of the digital adjustable rheostat through a preset communication instruction, namely acquiring the resistance of the first resistor or the second resistor, namely calculating the voltage division ratio. The digital resistor can be set with the resistance value through a preset communication instruction, and the voltage division ratio can be adjusted in real time. For example, when the driving voltage of the light emitting source of the photoelectric coupler is 3V, if the detection voltage is required to exceed 10V, circuit self-locking is required, the ratio of the resistance values of the first resistor to the second resistor is set to 7:3, and when the detection voltage exceeds 10V, the first voltage value can exceed 3V so as to drive the light emitting source of the photoelectric coupler, and circuit self-locking is achieved.
It is worth mentioning that the method further comprises:
the first resistor or the second resistor is formed by connecting one or more resistors in series;
wherein at least one of the resistors in the series is a digitally adjustable varistor.
The resistor device may be connected in series to increase the overall resistance value, and the digitally adjustable varistor may be connected in series to another resistor to increase the overall resistance value. For example, if the adjustment range of the resistor is between 50 ohms and 100 ohms and the adjustment range of the digital adjustable varistor is between 0 ohms and 50 ohms, the required adjustment range can be achieved by connecting one 50 ohms resistor or a plurality of resistors with total resistance of 50 ohms in series, so that the voltage division ratio adjustment requirement of the voltage division module can be better met.
The invention provides an isolation self-locking circuit and a method, when a circuit state is in an unlocking state, if a first voltage value obtained by dividing a detection voltage by a voltage dividing module is higher than a preset first voltage threshold value, the circuit state is switched and kept in the locking state by the self-locking module so as to ensure the safety and the reliability of the circuit; when the circuit state is in the locking state, if the first voltage value of the detection voltage after being divided by the voltage dividing module is lower than the preset second voltage threshold value and the unlocking condition is met, the self-locking module is enabled to switch and keep the circuit state in the unlocking state through the unlocking module, the convenience of the unlocking operation of the isolation self-locking circuit is improved, and the use experience of a user is improved.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An isolated self-locking circuit, the circuit comprising:
the device comprises a voltage dividing module, an isolation module, a self-locking module and an unlocking module;
the voltage dividing module is used for dividing the detection voltage;
the isolation module is used for isolating the detection voltage;
the self-locking module is used for keeping the circuit state to be in a locking state or an unlocking state;
the unlocking module is used for switching the circuit state of the self-locking module from a locking state to an unlocking state;
when the first voltage value of the detected voltage divided by the voltage dividing module exceeds a preset first voltage threshold value, the voltage dividing module drives the isolation module, the isolation module enables the circuit state of the self-locking module to be switched into a locking state, and the self-locking module keeps the circuit state in the locking state;
when the first voltage value of the detected voltage divided by the voltage dividing module is lower than a preset second voltage threshold value, acquiring first time information, judging whether to drive the unlocking module according to the first time information, if yes, driving the unlocking module to enable a circuit of the self-locking module to be switched into an unlocking state, and keeping the circuit state to be the unlocking state by the self-locking module.
2. The isolated self-locking circuit of claim 1, wherein the voltage divider module comprises:
a first resistor and a second resistor;
one end of the first resistor is connected to the detection voltage, and the other end of the first resistor is connected to the second resistor;
one end of the second resistor is connected to the first resistor, and the other end of the second resistor is connected to the ground as an acquisition point of the first voltage value.
3. The isolated self-locking circuit of claim 1, wherein the isolation module comprises:
the first photoelectric coupler is used for isolating the input end and the output end;
the input end of the first photoelectric coupler is connected with the voltage dividing module;
the output end of the first photoelectric coupler is connected with the self-locking module and used for driving the self-locking module to switch the circuit state into a locking state.
4. An isolated self-locking circuit according to claim 3, wherein the self-locking module comprises:
a first triode, a first field effect transistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;
the collector electrode and the emission stage of the first triode are respectively connected with two ends of the output end of the isolation module; one end of the output end of the isolation module is connected to a driving power supply, and the other end of the output end of the isolation module is connected to the first end of the third resistor; the base of the first triode is connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor is connected to a driving power supply, and the other end of the sixth resistor is connected to the drain electrode of the first field effect transistor; the second end of the third resistor is connected to the grid electrode of the first field effect transistor and one end of the fourth resistor, and the other end of the fourth resistor is grounded; and the source stage of the first field effect transistor is grounded.
5. The isolated self-locking circuit of claim 4, wherein the unlocking module comprises:
a second triode and a seventh resistor;
the base electrode of the second triode is connected with one end of a seventh resistor, and the other end of the seventh resistor is connected to a control signal; the collector electrode of the second triode is connected to the grid electrode of the first field effect tube; and the emitting stage of the second triode is grounded.
6. An isolated self-locking method applied to the isolated self-locking circuit of any one of claims 1-5, wherein the method comprises the following steps:
acquiring circuit state information of the self-locking module, and if the circuit state information is in a locking state;
acquiring first voltage information, and judging whether the first voltage information is lower than a preset second voltage threshold value;
if yes, acquiring first time information, and judging whether to execute unlocking operation according to the first time information;
if yes, an unlocking signal is sent to the unlocking module.
7. The method of claim 6, wherein determining whether to perform the unlocking operation according to the first time information comprises:
starting a first timer and recording first time information;
judging whether the first voltage information is higher than a preset second voltage threshold value or not;
if yes, closing the first timer, and stopping recording the first time information;
if not, judging whether the first time information exceeds a preset time threshold value;
if yes, unlocking operation is executed.
8. The method of claim 6, wherein the sending an unlocking signal to the unlocking module is specifically:
the unlocking signal is a high-level signal with preset duration;
the unlock signal is sent and then switched to a low level.
9. The method of isolated self-locking of claim 6, further comprising:
acquiring temperature information of a circuit;
judging whether the temperature information exceeds a preset temperature threshold value or not;
if yes, the unlocking operation is forbidden.
10. The method of isolated self-locking of claim 6, further comprising:
acquiring resistance information of a digital resistor;
and adjusting the resistance information of the digital resistor according to the resistance information and a preset communication instruction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311635743.1A CN117335789B (en) | 2023-12-01 | 2023-12-01 | Isolation self-locking circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311635743.1A CN117335789B (en) | 2023-12-01 | 2023-12-01 | Isolation self-locking circuit and method |
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| CN117335789B CN117335789B (en) | 2024-03-22 |
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|---|---|---|---|---|
| EP0111028A2 (en) * | 1982-12-13 | 1984-06-20 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. | Power switch, in particular a transistor power switch |
| CN201937248U (en) * | 2010-12-22 | 2011-08-17 | 四川长虹电器股份有限公司 | Self-locking protective circuit for switch power supply |
| CN205622209U (en) * | 2016-04-28 | 2016-10-05 | 深圳市智创电机有限公司 | Auto -lock of motor drive hardware and reset circuit |
| CN108449836A (en) * | 2018-04-04 | 2018-08-24 | 深圳珈伟光伏照明股份有限公司 | A kind of LED light light-operated circuit and LED lamp |
| CN218733210U (en) * | 2022-10-21 | 2023-03-24 | 杭州优迈科技有限公司 | Over-temperature protection circuit |
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2023
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0111028A2 (en) * | 1982-12-13 | 1984-06-20 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. | Power switch, in particular a transistor power switch |
| CN201937248U (en) * | 2010-12-22 | 2011-08-17 | 四川长虹电器股份有限公司 | Self-locking protective circuit for switch power supply |
| CN205622209U (en) * | 2016-04-28 | 2016-10-05 | 深圳市智创电机有限公司 | Auto -lock of motor drive hardware and reset circuit |
| CN108449836A (en) * | 2018-04-04 | 2018-08-24 | 深圳珈伟光伏照明股份有限公司 | A kind of LED light light-operated circuit and LED lamp |
| CN218733210U (en) * | 2022-10-21 | 2023-03-24 | 杭州优迈科技有限公司 | Over-temperature protection circuit |
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| CN117335789B (en) | 2024-03-22 |
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