CN113452009A - Protective circuit - Google Patents
Protective circuit Download PDFInfo
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- CN113452009A CN113452009A CN202110609953.8A CN202110609953A CN113452009A CN 113452009 A CN113452009 A CN 113452009A CN 202110609953 A CN202110609953 A CN 202110609953A CN 113452009 A CN113452009 A CN 113452009A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a protection circuit, comprising: the input voltage module is used for connecting the input circuit to complete power supply input, and the current and the voltage can be directly obtained when power supply is input; the sampling chip is used for collecting the information of the power supply circuit to obtain a sampling signal; the reference adjustable resistance module is used for setting a preset overload reference point of the protection circuit to obtain a reference signal; the comparison chip is used for comparing the sampling signal with the reference signal and carrying out operational amplification; d triggers the chip, is used for outputting the level; the NOT gate trigger chip is used for processing the signal of the comparison chip and outputting a level; the AND gate trigger chip is used for processing and outputting signals; a power supply relay for turning on/off power supply of the protection circuit; the control panel signal feedback module is used for carrying out software control; the controller is used for controlling the sampling process of the sampling chip; therefore, continuous output under double faults can be avoided, and potential safety hazards caused by overload output due to faults are effectively avoided.
Description
Technical Field
The invention relates to the technical field of electronic circuits and semiconductors, in particular to a protection circuit.
Background
Circuits often produce high operating overvoltages when turning on and off inductive loads or large loads, and such transient overvoltages (or overcurrents), referred to as surge voltages (or surge currents), are a type of transient disturbance. For example, to meet the requirement of the power receiving device for large current, a capacitor (such as a farad capacitor) with a large capacitance value is added to a circuit of most power receiving devices, when the power receiving device has the large current requirement, a short large current is provided by the farad capacitor or the capacitor with the large capacitance value, and when the large current is not needed, the circuit charges the farad capacitor. However, at the moment of supplying power to a power receiving device including a capacitor (such as a farad capacitor) with a large capacitance value, a large surge current may be generated due to the large capacitance value of the capacitor (such as the farad capacitor), which may seriously damage the power supply device and also cause unrecoverable damage to the capacitor or circuit of the power receiving device.
In the use process of a computer, in order to protect electronic components, a short-circuit protection circuit, such as a self-recovery fuse, is generally arranged. The power supply source for supplying power may cause an unstable output current for various reasons. In the use process of a household or medical computer, in order to protect the computer and place potential safety hazards, a circuit of a computer host can be protected, a protection circuit is generally arranged, the protection circuit is connected with the computer host, and then the protection circuit is connected with a general circuit to achieve the effect of circuit protection, so that the effect of the protection circuit is achieved.
At present, some protection circuits exist, but the problem that the continuous output of the circuit under the double fault condition causes potential safety hazard is not solved.
Disclosure of Invention
Therefore, the invention provides a protection circuit which can effectively solve the technical problem that potential safety hazards occur due to continuous output of a circuit under double faults in the prior art.
To achieve the above object, the present invention provides a protection circuit, including:
the input voltage module is used for connecting the input circuit to complete power supply input, and the current and the voltage can be directly obtained when power supply is input;
the sampling chip is connected with the input voltage module and used for collecting information of the power supply circuit to obtain a sampling signal;
the reference adjustable resistance module is connected with the input voltage module and used for setting a preset overload reference point of the protection circuit to obtain a reference signal;
the comparison chip is respectively connected with the sampling chip and the reference adjustable resistance module and is used for comparing and amplifying the sampling signal and the reference signal;
the D trigger chip is connected with the comparison chip and used for processing the signals compared by the comparison chip and outputting a level;
the NOT gate trigger chip is connected with the comparison chip and used for processing the signal of the comparison chip and outputting a level;
the AND gate trigger chip is respectively connected with the D trigger chip and the NOT gate trigger chip and is used for processing and outputting signals;
the power supply relay is connected with the input voltage module and used for turning on/off the power supply of the protection circuit;
the control panel signal feedback module is connected with the power supply relay and used for carrying out software control;
the controller is connected with the sampling chip and used for controlling the sampling process of the sampling chip;
when the sampling chip samples, the controller compares the actual current A with the preset current to determine whether the sampling signal meets the standard, compares the input voltage U of the input voltage module with the standard input voltage U0 to determine whether the sampling signal meets the standard again, determines the sampling frequency adjustment quantity according to the current difference G when the sampling signal does not meet the standard, and adjusts the sampling frequency of the sampling chip to enable the sampling signal to meet the standard when the sampling frequency adjustment quantity is determined.
Further, when the sampling chip performs sampling, the controller acquires the current transmitted to the sampling chip by the input voltage module and sets the current to be an actual current A, when the setting is completed, the controller compares the actual current A with a preset current to determine whether the sampling signal meets the standard, and when the controller judges that the sampling signal meets the standard, the sampling chip transmits the sampling signal to the comparison chip for comparison;
the controller is provided with preset current magnitude, wherein the preset current magnitude comprises a first preset current magnitude A1 and a second preset current magnitude A2, A1 is less than A2;
if A is less than A1, the controller judges that the sampling signal does not meet the standard;
if A is not less than A1 and not more than A2, the controller judges that the sampling signal meets the standard;
if A > A2, the controller determines that the input voltage level needs to be combined to determine whether the sampled signal meets the criteria.
Further, the controller judges whether the sampling signal meets the standard or not by combining the input voltage, the controller acquires the voltage of the input voltage module and sets the voltage as the input voltage U, when the setting is finished, the controller compares the input voltage U with the standard input voltage U0 to determine whether the sampling signal meets the standard or not, and when the controller judges that the sampling signal meets the standard, the sampling chip transmits the sampling signal to the comparison chip for comparison;
if U is less than U0, the controller sampling signal does not meet the standard;
if U is larger than or equal to U0, the controller sampling signal meets the standard.
Further, when the controller sampling signal does not meet the standard, the controller calculates a current difference value G, when the calculation is completed, the control unit compares the current difference value G with the controllable current difference value to determine a sampling frequency adjustment amount, and when the controller determines that the sampling frequency adjustment amount is Qi, the sampling frequency of the sampling chip is adjusted to enable the sampling signal to meet the standard, and i is set to be 1, 2,3, 4;
the controller is further provided with a controllable current difference value and a sampling frequency regulating quantity, wherein the controllable current difference value comprises a first controllable current difference value G1, a second controllable current difference value G2 and a third controllable current difference value G3, and G1 is more than G2 and more than G3; the sampling frequency adjustment quantity comprises a sampling frequency first adjustment quantity Q1, a sampling frequency second adjustment quantity Q2, a sampling frequency third adjustment quantity Q3 and a sampling frequency fourth adjustment quantity Q4, wherein Q1 is more than Q2 and more than Q3 and more than Q4;
if G < G1, the controller determines that the sampling frequency adjustment amount is Q1;
if G1 is not less than G2, the controller judges that the sampling frequency adjustment amount is Q2;
if G2 is not less than G3, the controller judges that the sampling frequency adjustment amount is Q3;
and if G is larger than or equal to G3, the controller judges that the sampling frequency adjustment amount is Q4.
Further, when the controller sampling signal does not meet the standard, the controller calculates a current difference value G, which is calculated by the following formula:
g ═ a1-a, or, G ═ (U0/U) × (a-a 2);
in the formula, a represents the current magnitude transmitted to the sampling chip by the input voltage module, a1 represents a first preset current magnitude, a2 represents a second preset current magnitude, U represents the voltage of the input voltage module, U0 represents a standard input voltage magnitude, when a < a1, G is a1-a, and when a > a2 and U < U0, G is (U0/U) × (a-a 2).
Further, the protection circuit further comprises an output signal relay which is connected with the NOT gate trigger chip and controls the transmission of the output signal by disconnecting/starting power supply.
Further, the protection circuit further comprises a voltage switching relay connected with the input voltage module for performing voltage switching.
Furthermore, the protection circuit further comprises an output voltage module, wherein the output voltage module is connected with the output signal relay and is used for being connected with an output circuit to complete power supply output.
Furthermore, the protection circuit further comprises an output circuit, which is connected with the output voltage module and used for power supply transmission.
Furthermore, the protection circuit further comprises an LED lamp which is connected with the control panel signal feedback module and used for lighting a prompt when an alarm signal is output.
Compared with the prior art, the protection circuit has the advantages that on one hand, the sampling chip is used for acquiring the sampling signal, the reference signal is set through the reference adjustable resistance module, when the power is on, the comparison chip is used for comparing the sampling signal with the reference signal, when the high-level signal is obtained through comparison, the D trigger chip and the NOT trigger chip are used for processing, then the AND trigger chip is used for processing and outputting, and finally the power supply is cut off through the power supply relay. On the other hand, the control panel signal feedback module inverts the output signal to output an alarm signal, the power supply relay is controlled to output a normally closed signal to the control circuit through the alarm signal, the control signal stops outputting, and meanwhile the LED lamp is turned on. Therefore, continuous output under double faults can be avoided, and potential safety hazards caused by overload output due to faults are effectively avoided.
Particularly, the invention compares the actual current with the preset current to determine whether the sampling signal meets the standard, compares the input voltage of the input voltage module with the standard input voltage to determine whether the sampling signal meets the standard again, determines the sampling frequency adjustment amount according to the current difference when the sampling signal does not meet the standard, and adjusts the sampling frequency of the sampling chip to enable the sampling signal to meet the standard when the sampling frequency adjustment amount is determined. Therefore, acquisition of sampling signals can be accurately controlled, the sampling signals can be compared with reference signals, errors caused by sampling problems are effectively avoided, continuous output under double faults can be further avoided, and potential safety hazards caused by overload output due to faults are effectively avoided.
Furthermore, the actual current A is compared with the preset current to determine whether the sampling signal meets the standard, the input voltage U of the input voltage module is compared with the standard input voltage U0 to determine whether the sampling signal meets the standard again, the sampling signal does not meet the standard, the controller determines the sampling frequency regulating quantity according to the current difference G, and when the sampling frequency regulating quantity is determined, the controller adjusts the sampling frequency of the sampling chip to enable the sampling signal to meet the standard, so that the acquisition of the sampling signal can be accurately controlled, the sampling signal can be compared with the reference signal, the comparison error caused by the sampling problem is effectively avoided, the continuous output under the double fault can be avoided, and the potential safety hazard caused by the overload output caused by the fault is effectively avoided.
Furthermore, the actual current A is compared with the preset current to determine whether the sampling signal meets the standard, the controller judges that the sampling signal meets the standard, the sampling chip transmits the sampling signal to the comparison chip for comparison, so that the acquisition of the sampling signal can be accurately controlled, the sampling signal can be compared with a reference signal, the comparison error caused by the sampling problem is effectively avoided, the continuous output under the double fault is further avoided, and the potential safety hazard caused by the overload output caused by the fault is effectively avoided.
Furthermore, the input voltage U is compared with the standard input voltage U0 to determine whether the sampling signal meets the standard, the controller judges that the sampling signal meets the standard, the sampling chip transmits the sampling signal to the comparison chip for comparison, so that the acquisition of the sampling signal can be accurately controlled, the sampling signal can be compared with a reference signal, the comparison error caused by the sampling problem is effectively avoided, the continuous output under the double fault can be further avoided, and the potential safety hazard caused by the overload output caused by the fault is effectively avoided.
Furthermore, the sampling frequency regulating quantity is determined by comparing the current difference value G with the controllable current difference value, so that the acquisition of a sampling signal can be accurately controlled, the sampling signal can be ensured to be used for being compared with a reference signal, the comparison error caused by the sampling problem is effectively avoided, the continuous output under the double fault can be further avoided, and the potential safety hazard caused by overload output due to the fault is effectively avoided.
Drawings
FIG. 1 is a schematic diagram of a protection circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a protection circuit according to an embodiment of the present invention;
the notation in the figure is: 1. an input voltage module; 2. sampling a chip; 3. a reference adjustable resistance module; 4. comparing the chips; 5. d, triggering a chip; 6. a NOT gate trigger chip; 7. an AND gate trigger chip; 8. a power supply relay; 9. a control panel signal feedback module; 10. an output signal relay; 11. a voltage switching relay; 12. resetting the key; 13. a controller; 14. an input circuit; 15. an output voltage module; 16. an output circuit; 17. an LED lamp.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a protection circuit according to an embodiment of the present invention, and fig. 2 is a block diagram of a protection circuit according to an embodiment of the present invention, where the present invention provides a protection circuit, including:
the input voltage module 1 is used for connecting the input circuit 14 to complete power supply input, and the current and the voltage can be directly obtained during power supply input;
the sampling chip 2 is connected with the input voltage module 1 and used for collecting information of a power supply circuit to obtain a sampling signal;
the reference adjustable resistance module 3 is connected with the input voltage module 1 and used for setting a preset overload reference point of a protection circuit to obtain a reference signal;
the comparison chip 4 is respectively connected with the sampling chip 2 and the reference adjustable resistance module 3 and is used for comparing and amplifying a sampling signal and a reference signal;
the D trigger chip 5 is connected with the comparison chip 4 and used for processing the signals compared by the comparison chip 4 and outputting the level;
the NOT gate trigger chip 6 is connected with the comparison chip 4 and used for processing the signal of the comparison chip 4 and outputting a level;
the AND gate trigger chip 7 is respectively connected with the D trigger chip 5 and the NOT gate trigger chip 6 and is used for processing and outputting signals;
a power supply relay 8 connected to the input voltage module 1 to turn on/off power supply of the protection circuit;
a control panel signal feedback module 9 connected with the power supply relay 8 for software control;
the controller 13 is connected with the sampling chip 2 and used for controlling the sampling process of the sampling chip 2;
when the sampling chip 2 performs sampling, the controller 13 compares the actual current magnitude a with a preset current magnitude to determine whether the sampling signal meets the standard, compares the input voltage magnitude U of the input voltage module 1 with the standard input voltage magnitude U0 to determine whether the sampling signal meets the standard again, when the sampling signal does not meet the standard, the controller 13 determines a sampling frequency adjustment amount according to the current difference G, and when the sampling frequency adjustment amount is determined, the controller 13 adjusts the sampling frequency of the sampling chip 2 to enable the sampling signal to meet the standard.
In this embodiment, when the circuit is not powered and protected, a normally open signal is output, the normally open signal is output by default, the normally closed signal is output in the protection state, the normally closed signal is output by default, the protection state is entered, the output is stopped, the software recognizes, and the signal is not output in the protection state.
In this embodiment, in a normal state, the sampling voltage obtained by the sampling chip 2 is lower than the reference voltage of the reference signal set by the reference adjustable resistance module 3, the sampling voltage and the reference voltage are transmitted by the comparison chip 4 and then output a low-level signal, and the signal is output as a high level by the D trigger chip 5; the signal is output to be high level through the D trigger chip 5 and the NOT gate trigger chip 6 at the same time; the signal passes through a D trigger chip 5 and a NOT trigger chip 6 at the same time, then passes through the logic conversion of an AND trigger chip 7, and then outputs high level; one path of the power supply is conducted to the triode, the power supply relay 8 supplies power, and the relay is conducted and supplies power normally; in addition, one path of feedback is fed back to the NOT gate trigger chip 6 to output low level, the triode is not conducted, the output signal relay 10 is not conducted, the control panel signal feedback outputs a normally open state, the control panel is not protected, signals are continuously output, and the power supply relay 8 and the control panel signal feedback two paths of signals do not stop working, so that normal operation is guaranteed.
In an abnormal state, the sampling voltage obtained by the sampling chip 2 is higher than the reference voltage of the reference signal set by the reference adjustable resistance module 3, the sampling voltage and the reference voltage output a high-level signal after being transmitted by the comparison chip 4, and the signal is output as a low level through the D trigger chip 5; the signal is output to be low level through the D trigger chip 5 and the NOT gate trigger chip 6 at the same time; the signal passes through a D trigger chip 5 and a NOT trigger chip 6 at the same time, then passes through the logic conversion of an AND trigger chip 7, and then outputs a low level; the triode is fed all the way, the low level cannot be conducted on the triode, the power supply relay 8 cannot supply power, the relay is in a non-conducting state and cannot supply power, the high level is fed back to the NOT gate trigger chip 6 to be output all the way, the triode is conducted, the output signal relay 10 is conducted, the control panel signal is fed back to output a normally closed state, the control panel is protected, and the output signal is stopped. The power supply relay 8 is not conducted, the control panel signal feedback protection is carried out, the output signal is stopped, and the two paths of signals stop working.
In an abnormal state, the protection circuit is triggered and the machine power supply is disconnected, this state being non self-recoverable, but the reset can be manually pressed. The reset key 12 is pressed to give a reset signal to the D trigger chip 5, a high level signal is output, and the protection circuit restores to normal operation.
In this embodiment, the reference adjustable resistor, also called adjustable potentiometer, is an adjustable electronic component, and is composed of a body and a rotating or sliding system. The D-flip-flop 5 is a flip-flop, also called a flip-flop, and is a sequential logic component with a memory function applied to a digital circuit, and can record binary digital signals "1" and "0". Operational amplifier is called operational amplifier for short. In an actual circuit, a certain functional module is usually formed together with a feedback network. A PLC control board is provided in the controller 13.
Specifically, the actual current magnitude A is compared with the preset current magnitude to determine whether the sampling signal meets the standard, the input voltage magnitude U of the input voltage module 1 is compared with the standard input voltage magnitude U0 to determine whether the sampling signal meets the standard again, the controller 13 determines the sampling frequency adjustment amount according to the current difference G, and when the sampling frequency adjustment amount is determined, the controller 13 adjusts the sampling frequency of the sampling chip 2 to enable the sampling signal to meet the standard, so that the acquisition of the sampling signal can be accurately controlled, the sampling signal can be compared with a reference signal, the comparison error caused by the sampling problem is effectively avoided, the continuous output under the double fault can be avoided, and the potential safety hazard caused by the overload output caused by the fault is effectively avoided.
Specifically, when the sampling chip 2 performs sampling, the controller 13 obtains the current magnitude transmitted to the sampling chip 2 by the input voltage module 1 and sets the current magnitude as an actual current magnitude a, when the setting is completed, the controller 13 compares the actual current magnitude a with a preset current magnitude to determine whether a sampling signal meets a standard, and when the controller 13 determines that the sampling signal meets the standard, the sampling chip 2 transmits the sampling signal to the comparison chip 4 for comparison;
the controller 13 is provided with preset current magnitudes, including a first preset current magnitude A1 and a second preset current magnitude A2, wherein A1 is less than A2;
if A is less than A1, the controller 13 determines that the sampled signal does not meet the standard;
if A is not less than A1 and not more than A2, the controller 13 judges that the sampling signal meets the standard;
if a > a2, the controller 13 determines that it is necessary to combine the input voltage magnitude to determine whether the sampled signal meets the criteria.
Specifically, the actual current magnitude A is compared with the preset current magnitude to determine whether the sampling signal meets the standard, the controller 13 judges that the sampling signal meets the standard, the sampling chip 2 transmits the sampling signal to the comparison chip 4 for comparison, so that the acquisition of the sampling signal can be accurately controlled, the sampling signal can be compared with a reference signal, the comparison error caused by the sampling problem is effectively avoided, the continuous output under the double fault can be further avoided, and the potential safety hazard caused by the overload output caused by the fault is effectively avoided.
Specifically, the controller 13 determines whether the sampling signal meets the standard in combination with the input voltage, the controller 13 acquires the voltage of the input voltage module 1 and sets the voltage as the input voltage U, when the setting is completed, the controller 13 compares the input voltage U with the standard input voltage U0 to determine whether the sampling signal meets the standard, and when the controller 13 determines that the sampling signal meets the standard, the sampling chip 2 transmits the sampling signal to the comparison chip 4 for comparison;
if U is less than U0, the sampling signal of the controller 13 does not meet the standard;
if U is greater than or equal to U0, the sampling signal of the controller 13 meets the standard.
Specifically, the input voltage U is compared with the standard input voltage U0 to determine whether the sampling signal meets the standard, the controller 13 judges that the sampling signal meets the standard, the sampling chip 2 transmits the sampling signal to the comparison chip 4 for comparison, so that the acquisition of the sampling signal can be accurately controlled, the sampling signal can be compared with a reference signal, the comparison error caused by the sampling problem is effectively avoided, the continuous output under the double fault can be further avoided, and the potential safety hazard caused by the overload output caused by the fault is effectively avoided.
Specifically, when the sampling signal of the controller 13 does not meet the standard, the controller 13 calculates a current difference G, when the calculation is completed, the control unit compares the current difference G with the controllable current difference to determine a sampling frequency adjustment amount, and when the controller 13 determines that the sampling frequency adjustment amount is Qi, the sampling frequency of the sampling chip 2 is adjusted to make the sampling signal meet the standard, and i is set to be 1, 2,3, 4;
the controller 13 is further provided with a controllable current difference value and a sampling frequency adjustment amount, wherein the controllable current difference value comprises a first controllable current difference value G1, a second controllable current difference value G2 and a third controllable current difference value G3, wherein G1 is greater than G2 and is greater than G3; the sampling frequency adjustment quantity comprises a sampling frequency first adjustment quantity Q1, a sampling frequency second adjustment quantity Q2, a sampling frequency third adjustment quantity Q3 and a sampling frequency fourth adjustment quantity Q4, wherein Q1 is more than Q2 and more than Q3 and more than Q4;
if G < G1, the controller 13 determines that the sampling frequency adjustment amount is Q1;
if G1 is less than or equal to G2, the controller 13 judges that the sampling frequency adjustment amount is Q2;
if G2 is less than or equal to G3, the controller 13 judges that the sampling frequency adjustment amount is Q3;
if G is larger than or equal to G3, the controller 13 judges that the sampling frequency adjustment amount is Q4.
Specifically, the sampling frequency adjustment quantity is determined by comparing the current difference value G with the controllable current difference value, so that the acquisition of a sampling signal can be accurately controlled, the sampling signal can be ensured to be compared with a reference signal, the comparison error caused by the sampling problem is effectively avoided, the continuous output under the double fault can be further avoided, and the potential safety hazard caused by overload output due to the fault is effectively avoided.
Specifically, when the sampling signal of the controller 13 does not meet the standard, the controller 13 calculates the current difference G according to the following formula:
g ═ a1-a, or, G ═ (U0/U) × (a-a 2);
in the formula, a represents the current magnitude transmitted from the input voltage module 1 to the sampling chip 2, a1 represents a first preset current magnitude, a2 represents a second preset current magnitude, U represents the voltage of the input voltage module 1, U0 represents a standard input voltage magnitude, and G is a1-a when a < a1, and G is (U0/U) × (a-a2) when a > a2 and U < U0.
Specifically, the current difference G is obtained through a preset formula and is divided into two conditions, each condition corresponds to one preset formula, and the calculation accuracy is improved.
With continued reference to fig. 1, the protection circuit further includes an output signal relay 10 connected to the not gate trigger chip 6 to control transmission of an output signal by turning off/on power supply. Thereby enabling control of the output signal.
With continued reference to fig. 1, the protection circuit further includes a voltage switching relay 11 connected to the input voltage module 1 for performing voltage switching. Thereby enabling voltage switching according to actual conditions.
As shown in fig. 1, the protection circuit further includes a reset button 12 connected to the D-trigger chip 5 for outputting a reset signal. So that the protection circuit can be restored to normal operation by the reset button 12.
With continued reference to fig. 2, the protection circuit further includes an input circuit 14 connected to the input voltage module 1 for supplying power. Thereby ensuring normal power supply of the circuit.
With continued reference to fig. 1, the protection circuit further includes an output voltage module 15, which is connected to the output signal relay 10 and is used to connect to an output circuit 16 to complete power output. Thereby ensuring that the power supply output is normal.
With continued reference to fig. 2, the protection circuit further includes an output circuit 16 connected to the output voltage module 15 for power transmission. Thereby ensuring normal output of the circuit.
With continued reference to fig. 2, the protection circuit further includes an LED lamp 17 connected to the control board signal feedback module 9 for illuminating a prompt when outputting an alarm signal. Therefore, continuous output under double faults can be avoided, and potential safety hazards caused by overload output due to faults are effectively avoided.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A protection circuit, comprising:
the input voltage module is used for connecting the input circuit to complete power supply input, and the current and the voltage can be directly obtained when power supply is input;
the sampling chip is connected with the input voltage module and used for collecting information of the power supply circuit to obtain a sampling signal;
the reference adjustable resistance module is connected with the input voltage module and used for setting a preset overload reference point of the protection circuit to obtain a reference signal;
the comparison chip is respectively connected with the sampling chip and the reference adjustable resistance module and is used for comparing and amplifying the sampling signal and the reference signal;
the D trigger chip is connected with the comparison chip and used for processing the signals compared by the comparison chip and outputting a level;
the NOT gate trigger chip is connected with the comparison chip and used for processing the signal of the comparison chip and outputting a level;
the AND gate trigger chip is respectively connected with the D trigger chip and the NOT gate trigger chip and is used for processing and outputting signals;
the power supply relay is connected with the input voltage module and used for turning on/off the power supply of the protection circuit;
the control panel signal feedback module is connected with the power supply relay and used for carrying out software control;
the controller is connected with the sampling chip and used for controlling the sampling process of the sampling chip;
when the sampling chip samples, the controller compares the actual current A with the preset current to determine whether the sampling signal meets the standard, compares the input voltage U of the input voltage module with the standard input voltage U0 to determine whether the sampling signal meets the standard again, determines the sampling frequency adjustment quantity according to the current difference G when the sampling signal does not meet the standard, and adjusts the sampling frequency of the sampling chip to enable the sampling signal to meet the standard when the sampling frequency adjustment quantity is determined.
2. The protection circuit according to claim 1, wherein when the sampling chip performs sampling, the controller obtains the current magnitude transmitted to the sampling chip by the input voltage module and sets the current magnitude as an actual current magnitude A, when the setting is completed, the controller compares the actual current magnitude A with a preset current magnitude to determine whether the sampling signal meets the standard, and when the controller determines that the sampling signal meets the standard, the sampling chip transmits the sampling signal to the comparison chip for comparison;
the controller is provided with preset current magnitude, wherein the preset current magnitude comprises a first preset current magnitude A1 and a second preset current magnitude A2, A1 is less than A2;
if A is less than A1, the controller judges that the sampling signal does not meet the standard;
if A is not less than A1 and not more than A2, the controller judges that the sampling signal meets the standard;
if A > A2, the controller determines that the input voltage level needs to be combined to determine whether the sampled signal meets the criteria.
3. The protection circuit of claim 2, wherein the controller determines whether the sampling signal meets the standard in combination with the input voltage, the controller obtains the voltage of the input voltage module and sets the voltage as the input voltage U, when the setting is completed, the controller compares the input voltage U with the standard input voltage U0 to determine whether the sampling signal meets the standard, and when the controller determines that the sampling signal meets the standard, the sampling chip transmits the sampling signal to the comparison chip for comparison;
if U is less than U0, the controller sampling signal does not meet the standard;
if U is larger than or equal to U0, the controller sampling signal meets the standard.
4. The protection circuit of claim 3, wherein the controller calculates a current difference value G when the sampling signal of the controller does not meet the standard, the control unit compares the current difference value G with the controllable current difference value to determine a sampling frequency adjustment amount when the calculation is completed, and when the sampling frequency adjustment amount is determined to be Qi by the controller, the sampling frequency of the sampling chip is adjusted to enable the sampling signal to meet the standard, and i is set to be 1, 2,3, 4;
the controller is further provided with a controllable current difference value and a sampling frequency regulating quantity, wherein the controllable current difference value comprises a first controllable current difference value G1, a second controllable current difference value G2 and a third controllable current difference value G3, and G1 is more than G2 and more than G3; the sampling frequency adjustment quantity comprises a sampling frequency first adjustment quantity Q1, a sampling frequency second adjustment quantity Q2, a sampling frequency third adjustment quantity Q3 and a sampling frequency fourth adjustment quantity Q4, wherein Q1 is more than Q2 and more than Q3 and more than Q4;
if G < G1, the controller determines that the sampling frequency adjustment amount is Q1;
if G1 is not less than G2, the controller judges that the sampling frequency adjustment amount is Q2;
if G2 is not less than G3, the controller judges that the sampling frequency adjustment amount is Q3;
and if G is larger than or equal to G3, the controller judges that the sampling frequency adjustment amount is Q4.
5. The protection circuit of claim 4, wherein when the controller sample signal fails to meet a criterion, the controller calculates a current difference G according to the following equation:
g ═ a1-a, or, G ═ (U0/U) × (a-a 2);
in the formula, a represents the current magnitude transmitted to the sampling chip by the input voltage module, a1 represents a first preset current magnitude, a2 represents a second preset current magnitude, U represents the voltage of the input voltage module, U0 represents a standard input voltage magnitude, when a < a1, G is a1-a, and when a > a2 and U < U0, G is (U0/U) × (a-a 2).
6. The protection circuit according to claim 1, further comprising an output signal relay connected to the not gate trigger chip for controlling transmission of an output signal by turning off/on power supply.
7. The protection circuit of claim 1, further comprising a voltage switching relay connected to the input voltage module for voltage switching.
8. The protection circuit of claim 1, further comprising an output voltage module coupled to the output signal relay for coupling to an output circuit to complete a power supply output.
9. The protection circuit of claim 8, further comprising an output circuit coupled to the output voltage module for power delivery.
10. The protection circuit of claim 1, further comprising an LED light connected to the control board signal feedback module for illuminating a prompt when outputting an alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110609953.8A CN113452009A (en) | 2021-06-01 | 2021-06-01 | Protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110609953.8A CN113452009A (en) | 2021-06-01 | 2021-06-01 | Protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113452009A true CN113452009A (en) | 2021-09-28 |
Family
ID=77810613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110609953.8A Withdrawn CN113452009A (en) | 2021-06-01 | 2021-06-01 | Protective circuit |
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| Country | Link |
|---|---|
| CN (1) | CN113452009A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114552539A (en) * | 2022-01-18 | 2022-05-27 | 北京萨诺光电科技发展有限公司 | Protective circuit |
| CN115436834A (en) * | 2022-08-29 | 2022-12-06 | 中科国微科技(深圳)有限公司 | Embedded power supply abnormity detection method and system |
-
2021
- 2021-06-01 CN CN202110609953.8A patent/CN113452009A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114552539A (en) * | 2022-01-18 | 2022-05-27 | 北京萨诺光电科技发展有限公司 | Protective circuit |
| CN114552539B (en) * | 2022-01-18 | 2022-09-23 | 北京萨诺光电科技发展有限公司 | Protective circuit |
| CN115436834A (en) * | 2022-08-29 | 2022-12-06 | 中科国微科技(深圳)有限公司 | Embedded power supply abnormity detection method and system |
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