CN109406989B - Load loop detection method, load detection circuit and electronic equipment - Google Patents
Load loop detection method, load detection circuit and electronic equipment Download PDFInfo
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- CN109406989B CN109406989B CN201811339856.6A CN201811339856A CN109406989B CN 109406989 B CN109406989 B CN 109406989B CN 201811339856 A CN201811339856 A CN 201811339856A CN 109406989 B CN109406989 B CN 109406989B
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- 238000001514 detection method Methods 0.000 title claims abstract description 138
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 166
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 166
- 239000010703 silicon Substances 0.000 claims abstract description 166
- 238000005070 sampling Methods 0.000 claims description 44
- 239000003990 capacitor Substances 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 17
- 230000000737 periodic effect Effects 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 12
- 230000015556 catabolic process Effects 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 8
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- 230000006870 function Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
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Abstract
The present invention relates to load detection technology, and in particular, to a load loop detection method, a load detection circuit, and an electronic device. And acquiring a load current sampled by the load detection circuit and a level signal converted by the load current by sending a driving signal to the controllable silicon, wherein the load current comprises a first current which flows through the load or a second current which does not flow through the load but flows through the load detection circuit, the second current is smaller than a maintaining current of the controllable silicon, and then determining the working state of the controllable silicon or the load according to the driving signal and the level signal. Therefore, the detection of the states of the load and the silicon controlled rectifier can be realized, and the overall safety performance is improved.
Description
Technical Field
The present invention relates to the field of load detection technologies, and in particular, to a load loop detection method, a load detection circuit, and an electronic device.
Background
At present, load control is the final aim of various electronic intelligent control products, wherein a silicon controlled rectifier is used as a switch, and a load is connected with the silicon controlled rectifier in series and is connected with a power supply, so that the control of the load is realized.
In carrying out the invention, the inventors have found that the prior art has at least the following problems:
when the load loop fails, the power supply is still used for providing power, but the state of the load or the silicon controlled rectifier cannot be confirmed, so that the safety is greatly threatened.
Disclosure of Invention
The invention aims to solve the problems of potential safety hazard and the like caused by the fact that the state of a load or a silicon controlled rectifier cannot be confirmed when the load is opened or the silicon controlled rectifier fails in the traditional load loop detection mode, and provides a load loop detection method which has the following technical scheme that:
in order to solve the technical problems, the embodiment of the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a load loop detection method, applied to a load detection circuit, where the load detection circuit is configured to detect a working state of a load loop, the load loop includes a silicon controlled rectifier and a load, and the silicon controlled rectifier is connected to the load, and the method includes:
transmitting a driving signal to the controllable silicon, wherein the driving signal is used for indicating the controllable silicon to work in an on state or an off state;
acquiring a load current sampled by the load detection circuit and a level signal converted by the load current, wherein the load current comprises a first current which flows through the load or a second current which does not flow through the load but flows through the load detection circuit, and the second current is smaller than a maintaining current of the silicon controlled rectifier;
And determining the working state of the controllable silicon or the load according to the driving signal and the level signal.
Further, the determining the working state of the silicon controlled rectifier according to the driving signal and the level signal includes:
and when the driving signal is used for indicating that the controllable silicon works in the cut-off state, determining the working state of the controllable silicon according to the level type of the level signal.
Further, the determining the working state of the silicon controlled rectifier according to the level type of the level signal includes:
when the level signal is in a periodic high-low level, the silicon controlled rectifier is in a normal state;
and when the level signal is in a continuous low level, the silicon controlled rectifier is in a breakdown state or a short circuit state.
Further, when the thyristor is in a normal state, the determining the working state of the load according to the driving signal and the level signal includes:
when the driving signal is used for indicating that the silicon controlled rectifier works in a conducting state and the level signal is in a periodic high-low level, the load is in a fault state;
when the driving signal is used for indicating that the silicon controlled rectifier works in a conducting state and the level signal is continuously low level, the load is in a normal state.
Further, before the driving signal is sent to the silicon controlled rectifier, the method includes:
acquiring a zero crossing signal of a power supply;
and setting the time for transmitting the driving signal of the controllable silicon according to the zero crossing signal.
In a second aspect, an embodiment of the present invention provides a load detection circuit for detecting a working state of a load loop, where the load loop includes a silicon controlled rectifier and a load, the silicon controlled rectifier is connected to the load, and the load detection circuit includes:
the sampling module is connected with the load and is used for sampling load current and converting the load current into a level signal, the load current comprises a first current flowing through the load or a second current flowing through the load detection circuit without flowing through the load, and the second current is smaller than the maintaining current of the silicon controlled rectifier;
the control module is connected with the sampling module and the silicon controlled rectifier;
wherein, the control module includes:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the load loop detection method as described above.
Further, the sampling module includes: the sampling point circuit is connected with the load in parallel, and the shaping circuit is connected with the sampling circuit and the control module;
the sampling circuit is used for acquiring the load current sampled by the load detection circuit;
the shaping circuit is used for converting the load current into a level signal.
Further, the sampling circuit includes: and one end of the first resistor is connected with the other end of the load and is connected with a power supply, and the other end of the first resistor is connected with one end of the load.
Further, the shaping circuit includes: the second resistor, the first diode, the second diode and the first capacitor;
one end of the second resistor is connected with one end of the load, the other end of the second resistor is connected with the negative electrode of the first diode and the positive electrode of the second diode, the positive electrode of the first diode is grounded, the negative electrode of the second diode is connected with a forward voltage, one end of the first capacitor is connected with the control module and the other end of the second resistor, and the other end of the first capacitor is grounded.
Further, the load detection circuit further includes:
and the protection circuit is connected between the control end of the controllable silicon and the control module and is used for preventing the driving voltage from damaging the controllable silicon.
The protection circuit comprises a third resistor and a second capacitor, one end of the second capacitor is connected with the other end of the third resistor, the other end of the second capacitor is connected with the control end of the silicon controlled rectifier, and one end of the third resistor is connected with the control module.
Further, the load detection circuit further includes:
the resistor Rong Jiangya circuit is connected with the other end of the load and used for reducing, stabilizing and filtering the power supply signal;
the resistance-capacitance voltage reduction circuit comprises a fourth resistor, a third capacitor, a fifth diode, a voltage stabilizing diode and an electrolytic capacitor; one end of the fourth resistor is connected with the power input end, the other end of the fourth resistor is connected with one end of the third capacitor, the other end of the third capacitor is connected with the negative electrode of the voltage-stabilizing diode and the positive electrode of the fifth diode, the positive electrode of the voltage-stabilizing diode is grounded, the negative electrode of the fifth diode is connected with the positive electrode of the electrolytic capacitor, the positive electrode of the electrolytic capacitor is connected with positive voltage, and the negative electrode of the electrolytic capacitor is grounded.
Further, the load detection circuit further includes:
the zero-crossing detection circuit is connected with the other end of the load and the control module, and is used for detecting zero crossing of a power supply signal and sending the acquired zero-crossing signal to the processing module;
The zero-crossing detection circuit comprises a third resistor, a third diode and a fourth diode; one end of the third resistor is connected with the power input end, the other end of the third resistor is connected with the negative electrode of the third diode and the positive electrode of the fourth diode, the positive electrode of the third diode is grounded, the positive electrode of the fourth diode is connected with the control module, and the negative electrode of the fourth diode is connected with the positive voltage.
In a third aspect, an embodiment of the present invention provides an electronic device, including:
a housing; the method comprises the steps of,
the load detection circuit as described above, the load detection circuit being disposed within the housing.
The embodiment of the invention has the beneficial effects that: according to the load loop detection method, the load detection circuit and the electronic device, the load current sampled by the load detection circuit and the level signal converted by the load current are obtained by sending the driving signal to the silicon controlled rectifier, the load current comprises a first current which flows through the load or a second current which does not flow through the load but flows through the load detection circuit, the second current is smaller than the maintaining current of the silicon controlled rectifier, and then the working state of the silicon controlled rectifier or the load is determined according to the driving signal and the level signal. Therefore, the detection of the states of the load and the silicon controlled rectifier can be realized, and the overall safety performance is improved.
Drawings
Fig. 1 is a schematic diagram of an application scenario of load detection provided by an embodiment of the present invention;
fig. 2 is a schematic flow chart of a load loop detection method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a load detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another load detection circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of another load detection circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of another load detection circuit according to an embodiment of the present invention;
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be noted that, if not in conflict, the features of the embodiments of the present invention may be combined with each other, which is within the protection scope of the present invention. In addition, while functional block division is performed in a device diagram and logical order is shown in a flowchart, in some cases, the steps shown or described may be performed in a different order than the block division in the device, or in the flowchart. Furthermore, the words "first," "second," "third," and the like as used herein do not limit the order of data and execution, but merely distinguish between identical or similar items that have substantially the same function and effect.
When intelligent control of the product is realized, the control of the load is realized by utilizing the on or off of the switching element. For example, at present, many household appliance control boards generally use on-off of a silicon controlled rectifier to control a load, but because the load and the silicon controlled rectifier are electronic components, the risk of failure and out-of-control exists, and once the critical components fail or are out-of-control, serious property loss or casualties can be caused, so that a load detection circuit needs to be arranged on a load loop to monitor the load and the silicon controlled rectifier.
Generally, the load detection circuit is generally provided with a sampling module to acquire a current signal in the load loop, convert the detection value into a voltage signal, and then judge the states of the load and the switching elements in the load loop according to the signal input by the load loop and the voltage signal acquired by the load detection circuit. A single-chip microcomputer is generally adopted in the load detection circuit to acquire a voltage signal. In addition, the technical scheme recorded in the prior art center generally connects the sampling module in series to the load loop so as to conveniently acquire the current in the load loop, when the silicon controlled rectifier fails when the load is open, the load detection circuit is in a suspended state, the specific states of the load and the silicon controlled rectifier are unknown, and the power supply also always supplies power to the load, so that certain potential safety hazard exists.
Based on the above, the embodiment of the invention provides a load loop detection method, a load detection circuit and electronic equipment.
The load loop detection method applied to the load detection circuit provided by the embodiment of the invention is a load loop detection method capable of improving the safety performance of a load loop, and specifically comprises the following steps: transmitting a driving signal to the controllable silicon, wherein the driving signal is used for indicating the controllable silicon to work in an on state or an off state;
acquiring a load current sampled by the load detection circuit and a level signal converted by the load current, wherein the load current comprises a first current which flows through the load or a second current which does not flow through the load but flows through the load detection circuit, and the second current is smaller than a maintaining current of the silicon controlled rectifier;
and determining the working state of the controllable silicon or the load according to the driving signal and the level signal.
In this embodiment of the present invention, a driving signal is sent to the silicon controlled rectifier, so as to obtain a load current sampled by the load detection circuit and a level signal converted by the load current, where the load current includes a first current that samples a current flowing through the load or a second current that does not flow through the load but flows through the load detection circuit, and the second current is smaller than a holding current of the silicon controlled rectifier, and then a working state of the silicon controlled rectifier or the load is determined according to the driving signal and the level signal. Therefore, the load detection circuit is ensured not to be in a suspended state, so that the states of load and silicon controlled rectifier can be provided in real time, and the overall safety performance is improved.
The load detection circuit for detecting the working state of the load circuit provided by the embodiment of the invention is a virtual device which is formed by a software program and can realize the load circuit detection method applied to the load detection circuit provided by the embodiment of the invention, and the load circuit detection method applied to the load detection circuit provided by the embodiment of the invention is based on the same invention conception and has the same technical characteristics and beneficial effects.
The electronic device provided by the embodiment of the invention can execute the load loop detection method provided by the embodiment of the invention or run the load detection circuit provided by the embodiment of the invention.
In particular, embodiments of the present invention are further described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an application scenario of load detection provided by a conventional technology. The application environment comprises the following steps: the device comprises a power supply, a load, a silicon controlled rectifier and a load detection module.
The power supply, the load and the silicon controlled rectifier form a conducting loop, the silicon controlled rectifier achieves a switching effect, the control end of the silicon controlled rectifier further comprises an access driving signal, and the control end of the silicon controlled rectifier achieves a conducting or a cutting-off working state according to the driving signal, so that the control of the load is achieved by means of self-turn-off and conducting. The load detection module is generally composed of a sampling module and a detection module, the sampling module is generally a component capable of realizing voltage division, such as a resistor and an inductor, the detection module is generally a singlechip, the sampling module is subjected to signal acquisition, and the working states of the silicon controlled rectifier and the load are judged according to the signals acquired by the detection module and the signals input by the conduction loop.
It should be noted that, the positioning method provided in the embodiment of the present invention may be further extended to other suitable application environments, and is not limited to the application environment shown in fig. 1. In the actual application process, the application environment can also comprise more targets.
Fig. 2 is a flow chart of a load loop detection method according to an embodiment of the present invention, specifically, referring to fig. 2, the method may include:
s10: transmitting a driving signal to the controllable silicon, wherein the driving signal is used for indicating the controllable silicon to work in an on state or an off state;
in this embodiment, the driving signal is generated by a controller that realizes a control function, and is sent to the control terminal of the silicon controlled rectifier to control on or off of the silicon controlled rectifier. The driving signal generally includes a high level or a low level, for example, when the silicon controlled rectifier is in a normal operation state, the silicon controlled rectifier is in an on state when the driving signal is in a high level, and when the driving signal is in a low level, the silicon controlled rectifier is in an off state; the driving signal is used for indicating that the silicon controlled rectifier works in an on state or an off state, namely the driving signal comprises an on signal or an off signal, the on signal is used for driving the silicon controlled rectifier to be in the on state when the silicon controlled rectifier is in a normal working state, the off signal is used for driving the silicon controlled rectifier to be in the off state when the silicon controlled rectifier is in the normal working state, generally, the on signal is one of a high level and a low level, and the off signal is the other. It should be noted that, a driving signal is sent to the silicon controlled rectifier, where the driving signal is used to indicate that the silicon controlled rectifier works in an on state or an off state, and the driving signal is performed when the state of the silicon controlled rectifier and the load is not determined, that is, the driving signal must cause the silicon controlled rectifier to be in a working state corresponding to the driving signal at this time; for example, the driving signal at this time is a signal indicating that the thyristor is operated in the off state, and the thyristor at this time is in an abnormal operation state, i.e., a "short-circuit state", and the thyristor at this time is not operated in the off operation state but is in the short-circuit state according to the driving signal.
S20: acquiring a load current sampled by the load detection circuit and a level signal converted by the load current, wherein the load current comprises a first current which flows through the load or a second current which does not flow through the load but flows through the load detection circuit, and the second current is smaller than a maintaining current of the silicon controlled rectifier;
in this embodiment, the load current includes a first current and a second current, the first current is obtained after a power supply flows through a load, the second current is obtained after the power supply flows through a load detection circuit directly without flowing through the load, and it should be noted that, when the load fails and cannot form a conductive loop through the load, the power supply directly flows through the module, so as to obtain a second current of a different type from the first current obtained after the power supply flows through the load. Further, the overall resistance of the module is far higher than the resistance of the load, so that when the load is normal, the resistance of the module has a negligible effect on the overall current of the load loop (because the module is in parallel with the load).
Furthermore, the second current is smaller than the holding current of the thyristor, and it should be noted that the holding current of the thyristor, that is, the minimum current for keeping the thyristor in forward conduction, is the minimum current, and when the current flowing through the thyristor is smaller than the holding current, the thyristor is automatically turned off even if the thyristor triggering conduction condition is met. That is, when the load cannot form a circuit for conducting the load loop, the current flowing through the load detection circuit is insufficient to reach the holding current of the thyristor, and even if the driving signal of the thyristor indicates that the thyristor is in a conducting state, the thyristor is turned off and is in a cut-off state. On one hand, the function of protecting the silicon controlled rectifier is achieved, on the other hand, the characteristic of the silicon controlled rectifier is utilized to achieve high identification degree of detection of the load, and even if the load is in an open state, the detection circuit can acquire the specific working state of the load or the silicon controlled rectifier, so that the overall safety performance is improved.
S30: and determining the working state of the controllable silicon or the load according to the driving signal and the level signal.
In this embodiment, the determining, according to the driving signal and the level signal, the state of the thyristor or the load is specifically the following four cases:
When the driving signal indicates that the silicon controlled rectifier works in a conducting state and the level signal is in a periodic high-low level, the silicon controlled rectifier is in a normal working state and the load is in an open-circuit state;
when the driving signal indicates that the silicon controlled rectifier works in a conducting state and the level signal is in a continuous low level, the silicon controlled rectifier is in a short circuit or breakdown state and a load uncertainty state, or the silicon controlled rectifier is in a normal working state and the load is in a normal working state;
when the driving signal indicates that the controllable silicon works in a cut-off state and the level signal is in a periodic high-low level, the controllable silicon is in a normal working state and in a load uncertain state;
when the driving signal indicates that the controllable silicon works in a cut-off state and the level signal is continuously low level, the controllable silicon is in a short circuit or breakdown state and the load is in an uncertain state;
it should be noted that, the uncertain load state refers to that the load can be in a normal working state or an open state, and when the thyristor can be in a normal state or a short circuit or breakdown state, the working state of the thyristor needs to be determined preferentially; when the silicon controlled rectifier is in a short circuit or breakdown state, the silicon controlled rectifier is maintained or replaced, and after the silicon controlled rectifier reaches a normal working state, the working state of a load can be further detected; when the controllable silicon is in a normal working state, the working state of the load can be further detected directly.
For example, when it is detected that the driving signal indicates that the thyristor is operating in the on state, and the level signal is continuously low, there are two conditions of load and state of the thyristor:
1. the controllable silicon is in a short circuit or breakdown state, and the load is in an uncertain state, namely, the load can be in any one of a normal state and an open circuit state;
2. the controllable silicon is in a normal working state, and the load is in a normal working state;
when such a situation is detected, the operational state of the thyristor needs to be further determined because the state of the thyristor is uncertain, when the operational state of the thyristor is detected to be a normal operational state, the detection result of the load loop corresponds to the second situation, and when the operational state of the thyristor is detected to be a short circuit or breakdown state, the detection result of the load loop corresponds to the first situation.
In this embodiment, the driving signal input to the load loop and the level signal obtained by the load detection circuit are used to detect the working states of the load and the silicon controlled rectifier, so as to ensure the safety of the load loop and avoid potential safety hazards.
Further, determining the working state of the controllable silicon or the load according to the driving signal and the level signal comprises determining the working state of the controllable silicon according to the driving signal and the level signal;
Specifically, the control of the driving signal indicates that the silicon controlled rectifier works in a cut-off state, the state of the silicon controlled rectifier is determined, when the silicon controlled rectifier is in a short circuit state or a breakdown state, maintenance personnel are required to further maintain, and when the silicon controlled rectifier is in a good state, the driving signal can be controlled to indicate that the silicon controlled rectifier works in a conduction state, and the working state of a load is further judged.
Specifically, the determining the working state of the silicon controlled rectifier according to the driving signal and the level signal includes:
and when the driving signal is used for indicating that the controllable silicon works in the cut-off state, determining the working state of the controllable silicon according to the level type of the level signal.
When the thyristor is in a normal working state, the driving signal is used for indicating that the thyristor works in a cut-off state, the level signals acquired by the load detection circuit are all periodic high and low levels, that is, the power supply signal is not grounded through the thyristor but directly flows through the load detection circuit, and at the moment, even if the load is in an uncertain working state, the periodic high and low level signals acquired by the load detection circuit are not influenced, and the working state of the thyristor can be determined according to the characteristic. The state of the silicon controlled rectifier is preferentially determined, and a reference basis can be provided for the subsequent working state of the load, so that the accurate detection of the load and the silicon controlled rectifier in a load loop is realized, and the potential safety hazard caused by the undefined state of the silicon controlled rectifier is eliminated.
Specifically, the determining the working state of the silicon controlled rectifier according to the level type of the level signal includes:
when the level signal is in a periodic high-low level, the silicon controlled rectifier is in a normal state;
and when the level signal is in a continuous low level, the silicon controlled rectifier is in a breakdown state or a short circuit state.
When the silicon controlled rectifier is detected to be in a breakdown state or a short circuit state, the detection system can automatically generate alarm information, and a user or a manager is informed of switching of a silicon controlled rectifier circuit or maintenance or replacement of the silicon controlled rectifier by words or voices. The working state of the silicon controlled rectifier is accurately detected, potential safety hazards of a load loop caused by the undefined state of the silicon controlled rectifier are eliminated, and the overall safety performance is improved.
Further, when the working state of the controllable silicon is ensured to be a normal working state, the working state of the load can be further detected. On the premise that the controllable silicon is in a normal working state, the driving signal is used for indicating that the controllable silicon works in a conducting state, the working state of a load is detected at the moment, and the working state of the load can be further accurately detected, namely whether the load is in the normal working state or in an open circuit state can be accurately detected.
Specifically, when the thyristor is in a normal state, the determining the working state of the load according to the driving signal and the level signal includes:
when the driving signal is used for indicating that the silicon controlled rectifier works in a conducting state and the level signal is in a periodic high-low level, the load is in an open-circuit state;
when the driving signal is used for indicating that the silicon controlled rectifier works in a conducting state and the level signal is continuously low level, the load is in a normal state.
After confirming the working state of the silicon controlled rectifier, the working state of the load is confirmed, so that the detection of the states of two key components in the load loop is realized, the hidden potential safety hazard problem is solved to a great extent, and the overall safety performance is improved.
In this embodiment, before the driving signal is sent to the thyristor, the method includes:
acquiring a zero crossing signal of a power supply;
and setting the time for transmitting the driving signal of the controllable silicon according to the zero crossing signal.
It should be noted that, the power supply signal is a pulse signal, that is, the power supply signal is a periodic high-low level signal, a zero point is passed when the high level and the low level are converted, no power supply is provided in the load loop at the moment of zero crossing, and the switching of the on or off state of the silicon controlled rectifier is realized at the moment, so that the loss of the silicon controlled rectifier is greatly reduced, and the service life of the silicon controlled rectifier is prolonged. Therefore, the acquired zero-crossing signal is sent to the silicon controlled rectifier signal controller, and the sending time parameter of the driving signal is set according to the zero-crossing signal, so that the loss of the silicon controlled rectifier is reduced, and the service life of the silicon controlled rectifier is prolonged.
As can be seen from the above technical solution, in the load loop detection method provided by this embodiment, a driving signal is sent to the silicon controlled rectifier, where the driving signal is used to indicate that the silicon controlled rectifier works in an on state or an off state; acquiring a load current sampled by the load detection circuit and a level signal converted by the load current, wherein the load current comprises a first current which flows through the load or a second current which does not flow through the load but flows through the load detection circuit, and the second current is smaller than a maintaining current of the silicon controlled rectifier; and determining the working state of the controllable silicon or the load according to the driving signal and the level signal. Therefore, the detection of the states of the load and the silicon controlled rectifier can be realized, and the overall safety performance is improved.
It should be noted that, in the foregoing embodiments, there is not necessarily a certain sequence between the steps, and those skilled in the art will understand that, in different embodiments, the steps may be performed in different execution sequences, that is, may be performed in parallel, may be performed interchangeably, or the like.
Fig. 3 is a schematic structural diagram of a load detection circuit according to an embodiment of the present invention; specifically, referring to fig. 2 and 3, a load detection circuit is configured to detect an operating state of a load loop, where the load loop includes a silicon controlled rectifier T and a load L, the silicon controlled rectifier T is connected to the load L, and the load detection circuit includes a sampling module 10 and a control module 30.
The sampling module 10 is connected to the load L, and is configured to sample a load current and convert the load current into a level signal, where the load current includes a first current flowing through the load or a second current flowing through the load detection circuit without flowing through the load, and the second current is smaller than a holding current of the thyristor;
in some embodiments, the sampling module 10 collects the load current in a variety of forms, which may be: when the load L and the silicon controlled rectifier T are in a normal working state, and the silicon controlled rectifier T is conducted, the sampling module 10 collects first current flowing through the load L; when the load L is in an open circuit and the thyristor T is in a conductive state, the sampling module 10 collects the second current that directly flows through the load detection circuit without flowing through the load L.
The control module 30 is respectively connected with the sampling module 10 and the silicon controlled rectifier T;
in some embodiments, the control module 30 is provided with a plurality of signal input/output ports for receiving and outputting signals, thereby enabling signal interaction with other execution terminals or servers. Specifically, in this embodiment, the control module 30 is configured to output a driving signal of the thyristor T and receive a zero crossing signal of the power supply and a level signal of the load loop, so as to perform the functions of driving and protecting the load loop, and also perform the detection function on the load loop.
Further, referring to fig. 3, the control module 30 includes:
at least one processor 31; and
a memory 32 communicatively coupled to the at least one processor 31; wherein the memory 32 stores instructions executable by the at least one processor 31 to enable the at least one processor 31 to be used to perform the load loop detection method of the various embodiments described above.
Referring to fig. 3, the sampling module 10 includes: a sampling circuit 12 connected in parallel with the load L, and a shaping circuit 11 connected to the sampling circuit 12 and the control module 30;
the sampling circuit 12 is configured to sample a load current in the load loop;
the shaping circuit 11 is used for converting the load current into a level signal.
In this embodiment, the sampling circuit 12 is connected to the load loop in parallel with the load L, and the resistance of the sampling circuit 12 is far greater than that of the load L, so that the load L is connected in parallel with the sampling circuit 12 to have a negligible effect on the load loop. When the load L is open, the sampling circuit 12 and the load L are connected in parallel, so that the load loop forms a loop of a power supply, the sampling circuit, the silicon controlled rectifier and a ground line, and the state of the silicon controlled rectifier T or other components cannot be detected or obtained because the load L is open, and the whole load loop is in an uncertain state, so that potential safety hazards are formed.
It should be noted that, because the sampling circuit 12 of the present invention is another load with a larger resistance value relative to the load loop, and the current flowing through the sampling circuit 12 without the load is smaller than the holding current of the thyristor T, when the current flowing through the two ends of the thyristor T is smaller than the holding current, no matter whether the driving signal input by the control end of the thyristor T is the working mode indicating that the thyristor T is turned on, the thyristor T is turned off, and the current is directly converted into the level signal after passing through the sampling module 10, at this time, the level signal obtained by the control module 30 is the periodic high-low level signal. The load detection circuit of the embodiment acts as a load function when the load L is in an open state, and can further detect the working state of the silicon controlled rectifier T, so that one end of the silicon controlled rectifier T and the load detection circuit are in a suspended state due to the fact that the load L is in the open state, the working state of the load circuit cannot be detected, the potential safety hazard is eliminated, and the overall safety performance is improved.
Specifically, referring to fig. 3, the sampling circuit 12 includes: and one end of the first resistor R1 is connected with the other end of the load L and is connected with a power supply, and the other end of the first resistor R1 is connected with one end of the load L.
The sampling circuit 12 is not limited to a single resistor, but may be a plurality of resistors with different connection modes, and may be an inductor or other components with larger resistance. The sampling circuit 12 plays a role in limiting current when the load L is in an open state, and pulls down the current of the load loop to the holding current of the thyristor T, so that the thyristor T is in a cut-off state, thereby playing a role in protection.
Specifically, the shaping circuit 11 includes: the second resistor R2, the first diode D1, the second diode D2 and the first capacitor C1;
one end of the second resistor R2 is connected with one end of the load L, the other end of the second resistor R2 is connected with the negative electrode of the first diode D1 and the positive electrode of the second diode D2, the positive electrode of the first diode D1 is grounded, the negative electrode of the second diode D2 is connected with a forward voltage, one end of the first capacitor C1 is connected with the control module 30 and the other end of the second resistor R2, and the other end of the first capacitor C1 is grounded.
Further, the shaping circuit 11 may be further specifically divided into a current limiting unit, a clipping unit, and a filtering unit;
The current limiting unit comprises a second resistor R2 and is used for limiting current and preventing the load detection circuit from being damaged due to overlarge current;
the amplitude limiting unit comprises a first diode D1 and a second diode D2, and is used for limiting the voltage amplitude;
the filtering unit comprises a first capacitor C1 for filtering the voltage signal.
The shaping circuit 11 in this embodiment is configured to perform shaping processing on a level signal flowing through a load loop, and specifically includes current limiting processing, amplitude limiting processing, and filtering processing, so that other impurities are not present when the signal in the level signal is sent to the control module, and the signal can be clearly identified by a corresponding controller, thereby improving the accuracy of detection.
Specifically, referring to fig. 5, the load detection circuit further includes:
a protection circuit 20, wherein the protection circuit 20 is connected between the control end of the silicon controlled rectifier T and the control module 30, and is used for preventing the driving voltage from damaging the silicon controlled rectifier T;
the protection circuit 20 includes a third resistor R3 and a second capacitor C2, one end of the second capacitor C2 is connected to the other end of the third resistor R3, the other end of the second capacitor C2 is connected to the control end of the thyristor T, and one end of the third resistor R3 is connected to the control module 30.
Specifically, referring to fig. 6, the load detection circuit further includes:
the resistance-capacitance voltage-reducing circuit 50 is connected with the other end of the load L and is used for carrying out voltage reduction, voltage stabilization and filtering treatment on a power supply signal;
the rc step-down circuit 50 includes a fourth resistor R4, a third capacitor C3, a fifth diode D5, a zener diode D6, and an electrolytic capacitor C4; one end of the fourth resistor R4 is connected with the power input end, the other end of the fourth resistor R4 is connected with one end of the third capacitor C3, the other end of the third capacitor C3 is connected with the negative electrode of the voltage stabilizing diode D6 and the positive electrode of the fifth diode D5, the positive electrode of the voltage stabilizing diode D6 is grounded, the negative electrode of the fifth diode D5 is connected with the positive electrode of the electrolytic capacitor C4, the positive electrode of the electrolytic capacitor C4 is connected with the positive voltage, and the negative electrode of the electrolytic capacitor C4 is grounded.
Specifically, the load detection circuit further includes:
the zero-crossing detection circuit 40 is connected with the other end of the load L and the control module 30, and is used for performing zero-crossing detection on a power supply signal and sending the acquired zero-crossing signal to the control module 30;
the zero-crossing detection circuit comprises a third resistor R3, a third diode D3 and a fourth diode D4; one end of the third resistor R3 is connected with the power input end, the other end of the third resistor R3 is connected with the negative electrode of the third diode D3 and the positive electrode of the fourth diode D4, the positive electrode of the third diode D3 is grounded, the positive electrode of the fourth diode D4 is connected with the control module 30, and the negative electrode of the fourth diode D4 is connected with the positive voltage.
In this embodiment, the sampling circuit is connected to the load loop in parallel, so that the load detection circuit and one end of the silicon controlled rectifier are not suspended when the load is open, and a level signal can be provided for the load detection circuit, so that the working state of the silicon controlled rectifier is detected, the potential safety hazard that the load loop is in an uncertain state due to suspension of the load detection circuit and one end of the silicon controlled rectifier caused by open load is avoided, and the overall safety performance is improved.
The embodiment of the invention also provides electronic equipment, which comprises:
a housing; the method comprises the steps of,
the load detection circuit as described above, the load detection circuit being disposed within the housing.
Since this embodiment and the above embodiments are based on the same concept, the contents of this embodiment may refer to the above embodiments on the premise that the contents do not conflict with each other, which is not described herein.
The electronic equipment can execute the load loop detection method in the corresponding method embodiment, and has the corresponding functional modules and beneficial effects of the execution method. For technical details not described in detail in the embodiments of the electronic device, reference may be made to the load loop detection method in the corresponding method embodiments described above.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus a general purpose hardware platform, but may also be implemented by means of hardware. Those of ordinary skill in the art will appreciate that all or a portion of the processes implementing the methods of the embodiments may be implemented by hardware associated with computer program instructions, where the program may be stored on a computer readable storage medium, where the program, when executed, may include processes of embodiments of the methods as described herein. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (11)
1. A load detection circuit for detecting an operating state of a load circuit, the load circuit comprising a thyristor and a load, the thyristor being connected to the load, the load detection circuit comprising:
the sampling module is connected with the load and is used for sampling load current and converting the load current into a level signal, the load current comprises a first current flowing through the load or a second current flowing through the load detection circuit without flowing through the load, and the second current is smaller than the maintaining current of the silicon controlled rectifier;
The control module is connected with the sampling module and the silicon controlled rectifier;
wherein, the control module includes:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform:
transmitting a driving signal to the controllable silicon, wherein the driving signal is used for indicating the controllable silicon to work in an on state or an off state;
acquiring a load current sampled by the load detection circuit and a level signal converted by the load current, wherein the load current comprises a first current which flows through the load or a second current which does not flow through the load but flows through the load detection circuit, and the second current is smaller than a maintaining current of the silicon controlled rectifier;
determining the working state of the controllable silicon or the load according to the driving signal and the level signal;
wherein, the sampling module includes: the sampling circuit is connected with the load in parallel, and the shaping circuit is connected with the sampling circuit and the control module;
The sampling circuit is used for sampling the load current in the load loop;
the shaping circuit is used for converting the load current into a level signal;
the shaping circuit includes: the second resistor, the first diode, the second diode and the first capacitor;
one end of the second resistor is connected with one end of the load, the other end of the second resistor is connected with the negative electrode of the first diode and the positive electrode of the second diode, the positive electrode of the first diode is grounded, the negative electrode of the second diode is connected with a forward voltage, one end of the first capacitor is connected with the control module and the other end of the second resistor, and the other end of the first capacitor is grounded.
2. The load detection circuit of claim 1, wherein: the sampling circuit includes: and one end of the first resistor is connected with the other end of the load and is connected with a power supply, and the other end of the first resistor is connected with one end of the load.
3. The load detection circuit of claim 1, wherein: the load detection circuit further includes:
the protection circuit is connected between the control end of the controllable silicon and the control module and is used for preventing the driving voltage from damaging the controllable silicon;
The protection circuit comprises a third resistor and a second capacitor, one end of the second capacitor is connected with the other end of the third resistor, the other end of the second capacitor is connected with the control end of the silicon controlled rectifier, and one end of the third resistor is connected with the control module.
4. The load detection circuit of claim 1, wherein: the load detection circuit further includes:
the resistor Rong Jiangya circuit is connected with the other end of the load and used for reducing, stabilizing and filtering the power supply signal;
the resistance-capacitance voltage reduction circuit comprises a fourth resistor, a third capacitor, a fifth diode, a voltage stabilizing diode and an electrolytic capacitor; one end of the fourth resistor is connected with the power input end, the other end of the fourth resistor is connected with one end of the third capacitor, the other end of the third capacitor is connected with the negative electrode of the voltage stabilizing diode and the positive electrode of the fifth diode, the positive electrode of the voltage stabilizing diode is grounded, the negative electrode of the fifth diode is connected with the positive electrode of the electrolytic capacitor, the positive electrode of the electrolytic capacitor is connected with positive voltage, and the negative electrode of the electrolytic capacitor is grounded.
5. The load detection circuit of claim 1, wherein: the load detection circuit further includes:
The zero-crossing detection circuit is connected with the other end of the load and the control module, and is used for detecting zero crossing of a power supply signal and sending the acquired zero-crossing signal to the control module;
the zero-crossing detection circuit comprises a third resistor, a third diode and a fourth diode; one end of the third resistor is connected with the power input end, the other end of the third resistor is connected with the negative electrode of the third diode and the positive electrode of the fourth diode, the positive electrode of the third diode is grounded, the positive electrode of the fourth diode is connected with the control module, and the negative electrode of the fourth diode is connected with the positive voltage.
6. A load loop detection method applied to the load detection circuit of any one of claims 1 to 5, wherein the load detection circuit is used for detecting the working state of a load loop, and the load loop comprises a silicon controlled rectifier and a load, and the silicon controlled rectifier is connected with the load.
7. The load circuit detection method according to claim 6, wherein: the determining the working state of the controllable silicon according to the driving signal and the level signal comprises the following steps:
and when the driving signal is used for indicating that the controllable silicon works in the cut-off state, determining the working state of the controllable silicon according to the level type of the level signal.
8. The method of claim 7, wherein determining the operating state of the thyristor according to the level type of the level signal comprises:
when the level signal is in a periodic high-low level, the silicon controlled rectifier is in a normal state;
and when the level signal is in a continuous low level, the silicon controlled rectifier is in a breakdown state or a short circuit state.
9. The load circuit detection method according to claim 8, wherein: when the silicon controlled rectifier is in a normal state, the determining the working state of the load according to the driving signal and the level signal comprises the following steps:
when the driving signal is used for indicating that the silicon controlled rectifier works in a conducting state and the level signal is in a periodic high-low level, the load is in an open-circuit state;
when the driving signal is used for indicating that the silicon controlled rectifier works in a conducting state and the level signal is continuously low level, the load is in a normal state.
10. The load circuit detection method according to claim 6, wherein: before the driving signal is sent to the controllable silicon, the method comprises the following steps:
acquiring a zero crossing signal of a power supply;
And setting the time for transmitting the driving signal of the controllable silicon according to the zero crossing signal.
11. An electronic device, comprising:
a housing; and a load detection circuit according to any one of claims 1 to 5, the load detection circuit being provided within the housing.
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| CN110113037B (en) * | 2019-05-27 | 2024-07-02 | 深圳和而泰小家电智能科技有限公司 | Zero crossing control circuit and electronic equipment |
| CN110568290A (en) * | 2019-09-18 | 2019-12-13 | 山东省计算中心（国家超级计算济南中心） | Real-time monitoring device for load working state of sound masking system under multi-load condition |
| CN110988571B (en) * | 2019-12-27 | 2022-01-21 | 昂宝电子（上海）有限公司 | Load insertion detection circuit, system and method |
| CN111736009A (en) * | 2020-07-21 | 2020-10-02 | 追创科技(苏州)有限公司 | Zero-crossing detection circuit and electronic equipment |
| CN113740765B (en) * | 2021-09-03 | 2024-08-06 | 赛尔富电子有限公司 | Short circuit detection circuit |
| CN114397833B (en) * | 2021-12-01 | 2024-05-03 | 深圳市联洲国际技术有限公司 | Load self-adaptive silicon controlled rectifier circuit and control method |
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