CN219960097U - Protection circuit, integrated circuit and electronic equipment - Google Patents
Protection circuit, integrated circuit and electronic equipment Download PDFInfo
- Publication number
- CN219960097U CN219960097U CN202321180430.7U CN202321180430U CN219960097U CN 219960097 U CN219960097 U CN 219960097U CN 202321180430 U CN202321180430 U CN 202321180430U CN 219960097 U CN219960097 U CN 219960097U
- Authority
- CN
- China
- Prior art keywords
- circuit
- protected
- voltage
- sub
- analog voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims description 62
- 238000005070 sampling Methods 0.000 claims description 29
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model provides a protection circuit, an integrated circuit and an electronic device, wherein the protection circuit comprises: a judgment circuit and a first control circuit; the judging circuit is used for converting alternating current output by the device to be protected into analog voltage and judging whether the device to be protected is overloaded or not or whether the device to be protected is short-circuited according to the analog voltage, so as to obtain a judging result; and the first control circuit is used for controlling the device to be protected to externally transmit or stop transmitting energy according to the judging result.
Description
Technical Field
The present utility model relates to the field of circuits, and more particularly, but not exclusively, to a protection circuit, an integrated circuit, and an electronic device.
Background
Along with the development of intelligent electronic equipment technology, requirements on reliability and safety of electronic equipment are higher and higher, so that electric energy input into the electronic equipment is generally detected, and overload and short circuit situations are prevented. The protection circuit in the related art firstly samples electric energy by means of a resistor voltage-dividing circuit, and then receives the electric energy by a micro control unit (Microcontroller Unit, MCU) and performs calculation processing through an internally set threshold value.
However, when the MCU performs voltage protection on the ac power, it is required to perform rectification processing on the ac power or detect the ac power through a peak circuit, the detection means is relatively complex, and the negative half cycle of the ac power cannot be accurately detected, so it is currently needed to provide a protection circuit capable of accurately performing overvoltage protection and short-circuit protection on the ac product.
Disclosure of Invention
The embodiment of the utility model provides a protection circuit, an integrated circuit and electronic equipment.
The embodiment of the utility model provides a protection circuit, which comprises: a judgment circuit and a first control circuit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the judging circuit is used for converting alternating current output by the device to be protected into analog voltage and judging whether the device to be protected is overloaded or not or whether the device to be protected is short-circuited or not according to the analog voltage, so as to obtain a judging result;
and the first control circuit is used for controlling the device to be protected to externally transmit or stop transmitting energy according to the judging result.
Optionally, the protection circuit further comprises a second control circuit; the second control circuit is used for generating a corresponding control signal according to the judging result and sending the corresponding control signal to the first control circuit; the first control circuit is further configured to control the device to be protected to externally transmit or stop transmitting energy according to the received control signal.
Optionally, the judging circuit comprises a sampling sub-circuit and a comparing sub-circuit; the sampling sub-circuit is used for sampling the alternating current output by the device to be protected and outputting analog voltage corresponding to the sampled alternating current.
Optionally, the comparing sub-circuit includes a first comparing sub-circuit and a second comparing sub-circuit; the first comparison sub-circuit is used for comparing the positive half-cycle part voltage in the analog voltage with a set value corresponding to a first voltage dividing resistor included in the first comparison sub-circuit; the second comparison sub-circuit is used for comparing the negative half-cycle voltage in the analog voltage with a set value corresponding to a second voltage dividing resistor included in the second comparison sub-circuit.
Optionally, the sampling sub-circuit comprises a hall element, a current limiting resistor, a filter capacitor and a power supply capacitor; the Hall element is used for sampling the alternating current output by the device to be protected, and calculating and outputting analog voltage corresponding to the sampled alternating current according to the potential difference corresponding to the magnetic field generated by the sampled alternating current; the current limiting resistor is used for protecting an output branch; the filter capacitor is used for filtering interference signals; the supply capacitor is used for providing electric energy for the sampling sub-circuit.
Optionally, the first comparison sub-circuit further includes a first operational amplifier comparator and a supply capacitor; the first operational amplifier comparator is used for determining whether the positive half-cycle voltage in the analog voltage is larger than a set value corresponding to the first voltage dividing resistor; the supply capacitor is used for supplying power to the first comparison sub-circuit.
Optionally, the second comparing sub-circuit further comprises a second operational amplifier comparator and a supply capacitor; the second operational amplifier comparator is used for determining whether the voltage of the negative half-cycle part in the analog voltage is larger than a set value corresponding to the second voltage dividing resistor; the supply capacitor is used for supplying power to the second comparison sub-circuit.
Optionally, the control signal includes a first control signal and a second control signal; the first control circuit is further used for controlling the device to be protected to externally transmit energy according to the received first control signal; the first control circuit is further used for controlling the device to be protected to stop transmitting energy to the outside according to the received second control signal.
The embodiment of the utility model provides an integrated circuit, which is integrated with the protection circuit.
The embodiment of the utility model provides electronic equipment, which integrates the protection circuit.
The embodiment of the utility model provides a protection circuit, an integrated circuit and electronic equipment, wherein the protection circuit comprises: a judgment circuit and a first control circuit; the judging circuit is used for converting alternating current output by the device to be protected into analog voltage and judging whether the device to be protected is overloaded or not or whether the device to be protected is short-circuited according to the analog voltage, so as to obtain a judging result; and the first control circuit is used for controlling the device to be protected to externally transmit or stop transmitting energy according to the judging result. That is, the utility model provides a protection circuit capable of accurately realizing overvoltage protection and short-circuit protection on an alternating current product, namely, an alternating current output by a device to be protected is directly converted into an analog voltage through a judging circuit, and then a judging result of whether the device to be protected is short-circuited or overloaded is determined according to the magnitude of the converted analog voltage; finally, the first control circuit obtains a judging result and controls the device to be protected to externally transmit or stop transmitting energy according to the judging result. Obviously, the utility model realizes accurate short circuit or overload protection of the device to be protected by only judging the circuit and the first control circuit, and has simple circuit. Meanwhile, the protection circuit provided by the utility model has a wide application range and can be applied to a plurality of alternating current output products.
Drawings
Fig. 1 is a schematic diagram of a protection circuit according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a second structure of the protection circuit according to the embodiment of the present utility model;
fig. 3 is a schematic diagram of a protection circuit according to an embodiment of the present utility model;
fig. 4 is a schematic circuit diagram of a comparison sub-circuit according to an embodiment of the present utility model;
fig. 5 is a schematic circuit diagram of a sampling sub-circuit according to an embodiment of the present utility model;
fig. 6 is a flow chart of a protection method implemented by the protection circuit according to the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the specific technical solutions of the present utility model will be described in further detail below with reference to the accompanying drawings in the embodiments of the present utility model. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Fig. 1 is a schematic structural diagram of an optional protection circuit 100 according to an embodiment of the present utility model, and referring to fig. 1, the protection circuit 100 includes a judging circuit 101 and a first control circuit 102. The judgment circuit 101 is connected to the first control circuit 102.
The judging circuit 101 is configured to convert an alternating current output by the device to be protected into an analog voltage, and judge whether the device to be protected is overloaded or whether the device to be protected is shorted according to the magnitude of the analog voltage, so as to obtain a judging result;
the first control circuit 102 is configured to control the device to be protected to externally transmit or stop externally transmitting energy according to the determination result.
In the embodiment of the present utility model, the first control circuit 102, also referred to as an ac control module, may include at least one electric control switch, where when the electric control switch is turned on, the first control circuit 102 works normally, i.e. the device to be protected is controlled to transmit energy to the outside, and when the electric control switch is turned off, the first control circuit 102 stops working, and then the first control circuit 102 cannot transmit energy to the device to be protected, and then the device to be protected stops transmitting energy to the outside.
In the embodiment of the present utility model, the first control circuit 102 controls the device to be protected to work normally according to the judgment result, that is, the device to be protected transmits energy to the outside; or controlling the device to be protected to stop working, namely stopping energy transmission to the outside by the device to be protected.
In some embodiments, the judging circuit 101, also called a current sampling module, can sample the alternating current output by the device to be protected, convert the sampled current analog signal into a voltage analog signal, and output the voltage analog signal; further, the judging circuit 101 judges whether the device to be protected is short-circuited, i.e. whether the actual running power of the device to be protected is greater than the rated power, or whether the device to be protected is short-circuited, i.e. whether the current in the device to be protected is greater than the current allowed by the wire, based on the magnitude of the analog voltage, so as to obtain a judging result.
In this embodiment, the device to be protected may be any ac product or dc product that may cause overload or short circuit, and may generate a plurality of different types of ac currents and output the ac currents according to the energy provided by the first control module.
The embodiment of the utility model provides a protection circuit, which comprises: a judgment circuit and a first control circuit; the judging circuit is used for converting alternating current output by the device to be protected into analog voltage and judging whether the device to be protected is overloaded or not or whether the device to be protected is short-circuited according to the analog voltage, so as to obtain a judging result; and the first control circuit is used for controlling the device to be protected to externally transmit or stop transmitting energy according to the judging result. That is, the utility model provides a protection circuit capable of accurately realizing overvoltage protection and short-circuit protection on an alternating current product, namely, an alternating current output by a device to be protected is directly converted into an analog voltage through a judging circuit, and then a judging result of whether the device to be protected is short-circuited or overloaded is determined according to the magnitude of the converted analog voltage; finally, the first control circuit obtains a judging result and controls the device to be protected to externally transmit or stop transmitting energy according to the judging result. Obviously, the utility model realizes accurate short circuit or overload protection of the device to be protected by only judging the circuit and the first control circuit, and has simple circuit. Meanwhile, the protection circuit provided by the utility model has a wide application range and can be applied to a plurality of alternating current output products.
Fig. 2 is a schematic structural diagram of another alternative protection circuit 100 according to an embodiment of the present utility model, and referring to fig. 2, the protection circuit 100 includes a judging circuit 101, a first control circuit 102, and a second control circuit 103.
The judgment circuit 101, the second control circuit 103 and the first control circuit 102 are connected in order; that is, the first end of the judging circuit 101 is connected to the first end of the second control circuit 103; a second end of the second control circuit 103 is connected to a first end of the first control circuit 102; a second terminal of the first control circuit 102 is connected to a second terminal of the determination circuit 101.
The judging circuit 101 is configured to convert an alternating current output by the device to be protected into an analog voltage, and judge whether the device to be protected is overloaded or whether the device to be protected is shorted according to the magnitude of the analog voltage, so as to obtain a judging result;
the second control circuit 103 is configured to generate a corresponding control signal according to the determination result, and send the control signal to the first control circuit 102;
the first control circuit 102 is configured to control the device to be protected to externally transmit or stop transmitting energy according to the received control signal.
In some embodiments, the control signal includes a first control signal and a second control signal; the first control circuit 102 is further configured to control the device to be protected to externally transmit energy according to the received first control signal; the first control circuit 102 is further configured to control the device to be protected to stop transmitting energy to the outside according to the received second control signal.
In an embodiment of the present utility model, the second control circuit 103 includes, but is not limited to, an MCU, a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components; the functions implemented by the second control circuit 103 may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Fig. 3 is a schematic structural diagram of another alternative protection circuit 100 provided in an embodiment of the present utility model, and referring to fig. 3, the protection circuit 100 includes a judging circuit 101, a first control circuit 102, a second control circuit 103, and an output module 104;
wherein, the first end of the judging circuit 101 is connected with the first end of the second control circuit 103; a second end of the second control circuit 103 is connected to a first end of the first control circuit 102; a second end of the first control circuit 102 is connected with an output end of the output module 104; the zero line output end (NEUTRAL) of the output module 104 is connected with the judging circuit 101, and the LIVE line output end (LIVE) of the output module 104 is connected with a load; the judgment circuit 101 is connected to a load. Of course, the judging circuit 101 may also be connected to the live output terminal of the output module 104, that is, the NEUTRAL output terminal (NEUTRAL) of the output module 104 is connected to the load.
It should be noted that the output module 104 is merely an exemplary structure or an exemplary operation. The output module of the device to be protected may be an output module of the device to be protected, or a device that is connected to the output unit of the device to be protected and does not have a processing function, for example, a socket, or may be an output module of the first control circuit 102; the first control circuit 102 may be connected to the determination circuit 101 and the load directly across the output module 104.
In a specific embodiment, the load is used as an element for consuming electric energy, and a specific selected load of the present utility model is not described herein.
In some embodiments, the decision circuit 101 includes a comparison sub-circuit 1011 and a sampling sub-circuit 1012; the sampling sub-circuit 1012 is configured to sample the ac power output by the device to be protected, and output an analog voltage corresponding to the sampled ac power.
In some embodiments, sampling subcircuit 1012 includes a hall element, a current limiting resistor, a filter capacitor, and a supply capacitor; the Hall element is used for sampling alternating current output by the device to be protected, and calculating and outputting analog voltage corresponding to the sampled alternating current according to potential difference corresponding to a magnetic field generated by the sampled alternating current; the current limiting resistor is used for protecting the output branch; the filter capacitor is used for filtering interference signals; the supply capacitor is used to provide power to the sampling sub-circuit 1012.
In some embodiments, the compare sub-circuit 1011 includes a first compare sub-circuit and a second compare sub-circuit; the first comparison sub-circuit is used for comparing the positive half-cycle part voltage in the analog voltage with a set value corresponding to a first voltage dividing resistor included in the first comparison sub-circuit; the second comparison sub-circuit is used for comparing the negative half-cycle voltage in the analog voltage with a set value corresponding to a second voltage dividing resistor included in the second comparison sub-circuit.
In some embodiments, the first comparison subcircuit further includes a first operational amplifier comparator and a supply capacitor; the first operational amplifier comparator is used for determining whether the positive half-cycle voltage in the analog voltage is larger than a set value corresponding to the first voltage dividing resistor; the supply capacitor is used for supplying power to the first comparison sub-circuit.
In some embodiments, the second comparison subcircuit further includes a second operational amplifier comparator and a supply capacitor; the second operational amplifier comparator is used for determining whether the negative half-cycle voltage in the analog voltage is larger than a set value corresponding to the second voltage dividing resistor; the supply capacitor is used for supplying power to the second comparison sub-circuit.
Fig. 4 is a schematic circuit diagram of a comparison sub-circuit 1011 according to an embodiment of the present utility model. Fig. 5 is a schematic circuit diagram of a sampling sub-circuit 1012 according to an embodiment of the present utility model. As shown in fig. 4, the comparison sub-circuit 1011 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first operational amplifier comparator U1A, a second operational amplifier comparator U1B, a first capacitor C1, and a second capacitor C2; the first resistor R1 and the second resistor R2 are voltage dividing resistors of the first comparison sub-circuit; the third resistor R3 and the fourth resistor R4 are voltage dividing resistors of the second comparison sub-circuit; the first operational amplifier comparator U1A is a first operational amplifier comparator of a first comparison sub-circuit; the second operational amplifier comparator U1B is a second operational amplifier comparator of a second comparison sub-circuit; the first capacitor C1 and the second capacitor C2 are supply capacitors of the first comparison sub-circuit and the second comparison sub-circuit.
The output end of the first operational amplifier comparator U1A and the output end of the second operational amplifier comparator U1B are connected with the second control circuit 103; note that, if the second control circuit 103 is an MCU, the io_ocp_mcu in fig. 3 indicates that the determination result is output to the MCU, so as to perform the overcurrent protection.
The non-inverting input end of the first operational amplifier comparator U1A is connected with the inverting input end of the second operational amplifier comparator U1B, the second end of the fifth resistor R5 of the sampling sub-circuit 1012 and the first end of the third capacitor C3 of the sampling sub-circuit 1012;
here, in fig. 4, the same symbol i_ac as in fig. 5 is used to indicate the connection among the second terminal of the fifth resistor R5, the non-inverting input terminal of the first op amp comparator U1A, the inverting input terminal of the second op amp comparator U1B, and the first terminal of the third capacitor C3.
The positive side power supply pin of the first operational amplifier comparator U1A, the first end of the first capacitor C1, the first end of the second capacitor C2 and the first end of the first resistor R1 are connected with a power supply end; the second end of the first capacitor C1 and the second end of the second capacitor C2 are connected with the grounding end; the second end of the first resistor R1 and the inverting input end of the first operational amplifier comparator U1A are connected with the first end of the second resistor R2; the second end of the second resistor R2, the grounding end and the negative side power supply pin of the first operational amplifier comparator U1A are connected with the first end of the third resistor R3; the second end of the third resistor R3 and the first end of the fourth resistor R4 are connected with the non-inverting input end of the second operational amplifier comparator U1B; the second end of the fourth resistor R4 is connected with the power supply end.
Here, the power supply terminal provides a power supply which can be +3.3v; the first capacitor C1 and the second capacitor C2 are connected in series.
It should be noted that, after the sampling sub-circuit 1012 outputs the analog voltage, the analog voltage flows to the first operational amplifier comparator U1A and the second operational amplifier comparator U1B, the first operational amplifier comparator U1A obtains the positive half-cycle voltage (i_ac is positive value) of the analog voltage, and the voltage dividing resistor in the first comparing sub-circuit: the set values corresponding to the first resistor R1 and the second resistor R2 are, for example: the set value is R1/(R1+R2), or R1/(R1+R2) 3.3. Here, 3.3 is a corresponding magnitude for representing the voltage of the power supply terminal, and since the voltage is divided, the set value can be multiplied by 3.3 to obtain an accurate set value. Then, the first operational amplifier comparator U1A compares the positive half cycle voltage of the analog voltage with the set value of the voltage dividing resistor in the first comparison sub-circuit to obtain a positive half cycle comparison result and outputs the positive half cycle comparison result. The positive half cycle comparison result comprises that the positive half cycle part voltage of the analog voltage is larger than the set value of the voltage dividing resistor in the first comparison sub-circuit, the positive half cycle part voltage of the analog voltage is smaller than the set value of the voltage dividing resistor in the first comparison sub-circuit, and the positive half cycle part voltage of the analog voltage is equal to the set value of the voltage dividing resistor in the first comparison sub-circuit.
For example, the voltage in the positive half cycle part of the analog voltage is greater than the set value of the voltage dividing resistor in the first comparison sub-circuit, for example, R1/(r1+r2) ×3.3> i_ac+1.65, and the output positive half cycle comparison result is 0; the positive half cycle voltage of the analog voltage is smaller than the set value of the voltage dividing resistor in the first comparison sub-circuit or equal to the set value of the voltage dividing resistor in the first comparison sub-circuit, and the output positive half cycle comparison result is 1. Here, 1.65 is the desired output signal rising to the median.
The second op-amp comparator U1B obtains a negative half-cycle voltage (i_ac is negative) of the analog voltage, and the voltage dividing resistor in the second comparison sub-circuit: the set values corresponding to the first resistor R3 and the second resistor R4 are, for example: the set value is R3/(R3+R4), or R3/(R3+R4) 3.3. Here, 3.3 is a corresponding magnitude for representing the voltage of the power supply terminal, and since the voltage is divided, the set value can be multiplied by 3.3 to obtain an accurate set value. Then, the second operational amplifier comparator U1B compares the voltage of the negative half cycle part of the analog voltage with the set value of the voltage dividing resistor in the second comparison sub-circuit to obtain and output a negative half cycle comparison result. The negative half cycle comparison result comprises that the positive half cycle part voltage of the analog voltage is larger than the set value of the voltage dividing resistor in the second comparison sub-circuit, the positive half cycle part voltage of the analog voltage is smaller than the set value of the voltage dividing resistor in the second comparison sub-circuit, and the positive half cycle part voltage of the analog voltage is equal to the set value of the voltage dividing resistor in the second comparison sub-circuit.
For example, the voltage in the negative half cycle part of the analog voltage is greater than the set value of the voltage dividing resistor in the second comparison sub-circuit, for example, R3/(r3+r4) ×3.3> i_ac+1.65, and the output positive half cycle comparison result is 0; the voltage of the negative half cycle part of the analog voltage is smaller than the set value of the voltage dividing resistor in the second comparison sub-circuit or the voltage of the positive half cycle part of the analog voltage is equal to the set value of the voltage dividing resistor in the second comparison sub-circuit, and the output negative half cycle comparison result is 1.
Further, the second control circuit 103 obtains the judgment result, that is, the positive half cycle comparison result and the negative half cycle comparison result, and generates a corresponding control signal by using the positive half cycle comparison result and the negative half cycle comparison result, and sends the control signal to the first control circuit 102.
If the positive half cycle comparison result and the negative half cycle comparison result are both 1, a first control signal is generated and sent to the first control circuit 102; if at least one of the positive half cycle comparison result and the negative half cycle comparison result is 0, a second control signal is generated and sent to the first control circuit 102.
Further, the first control circuit 102 is further configured to control the device to be protected to externally transmit energy according to the received first control signal, that is, the first control circuit 102 continues to operate, and control the device to be protected to externally transmit energy.
The first control circuit 102 is further configured to control the device to be protected to stop transmitting energy to the outside according to the received second control signal; here, the first control circuit 102 may be turned off, and energy cannot be transmitted to the device to be protected, and then the device to be protected stops transmitting energy to the outside. It is also possible that the connection between the first control circuit 102 and the device to be protected is broken. It is also possible that the first control circuit 102 directly controls the device to be protected to stop transmitting energy to the outside.
Here, the first control signal, also called a closed ac control module signal, is used for closing (communicating) the ac control module, where closing (communicating) may be connecting the ac control module with the product to be tested, i.e. the ac control module provides energy to the device to be protected, and the device to be protected normally outputs ac.
The second control signal, also called a turn-off ac control module signal, is used for turning off (turning off) the ac control module, where the turn-off (turning off) may be that the ac control module is turned off from the product to be protected, that is, the ac control module no longer provides energy to the device to be protected, and the device to be protected cannot output any current, so as to achieve protection of the device to be protected.
As shown in fig. 5, the sampling sub-circuit 1012 includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fifth resistor R5, and a chip U2; here, the chip U2 is a hall element of the sampling sub-circuit 1012; the fifth resistor R5 is a current limiting resistor of the sampling sub-circuit 1012; the fifth capacitor C5 and the sixth capacitor C6 are power supply capacitors of the sampling sub-circuit 1012; the third capacitor C3 and the fourth capacitor C4 are filter capacitors of the sampling sub-circuit 1012.
The first pin ip+1 of the chip U2 and the second pin ip+2 of the chip U2 are connected with the zero line output end NEUTRAL of the output module 104; the third pin IP_1 of the chip U2 and the fourth pin IP_2 of the chip U2 are connected with a load; the fifth pin GND of the chip U2 is connected with the ground terminal; the sixth pin Ref of the chip U2 is connected with the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is connected with the grounding end; the seventh pin VIOUT of the chip U2 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5, the non-inverting input end of the first operational amplifier comparator U1A, and the inverting input end of the second operational amplifier comparator U1B are connected to the first end of the third capacitor C3;
here, in fig. 4, the same symbol i_ac as in fig. 5 is used to indicate the connection among the second terminal of the fifth resistor R5, the non-inverting input terminal of the first op amp comparator U1A, the inverting input terminal of the second op amp comparator U1B, and the first terminal of the third capacitor C3.
The second end of the third capacitor C3 is connected with the grounding end; the eighth pin VCC of the chip U2, the power supply terminal, the first terminal of the fifth capacitor C5 and the first terminal of the sixth capacitor C6 are connected, and the second terminal of the fifth capacitor C5 and the second terminal of the sixth capacitor C6 are connected to the ground terminal.
Note that, in fig. 5, the LIVE output (LIVE) of the output module 104 is connected to the load, and the input of the output module 104 is connected to the first control circuit 102. Fig. 5 shows the neutral output using N ont1 and fig. 5 shows the hot output using L ont 1.
In a specific embodiment, the power supply terminal may use an ac power supply and a dc power supply to perform power supply processing, which is not described herein.
In the embodiment of the utility model, the chip U2 is configured to collect a current analog signal, that is, sample an ac power output by a device to be protected, sense a magnetic field generated by the sampled ac power, generate a potential difference, and further amplify and measure according to the potential difference, thereby calculating an analog voltage corresponding to the sampled ac power, and output the analog voltage at the port 7. Here, the current limiting resistor connected in the port 7, namely the fifth resistor R5, can protect the output branch; the filter capacitor, namely the third capacitor C3 and the fourth capacitor C4 can filter interference signals in the alternating current. The supply capacitor, i.e., the fifth capacitor C5, the sixth capacitor C6, can provide power to the sampling sub-circuit 1012.
Fig. 6 is a flow chart of a protection method implemented by the protection circuit according to the present utility model. The protection method can be applied to the electronic equipment, and comprises the following steps:
step 601, the judging module samples the alternating current output by the device to be protected, converts the sampled alternating current into analog voltage, and obtains a judging result according to the magnitude of the analog voltage, and further, step 602 or step 604 is executed.
Step 602, if the judgment result is used to represent that the positive half-cycle voltage in the analog voltage corresponding to the sampled alternating current exceeds the positive half-cycle set value, step 604 is executed, otherwise step 606 is executed.
Step 603, if the judgment result is used to represent that the negative half-cycle voltage in the analog voltage corresponding to the sampled alternating current exceeds the negative half-cycle set value, step 604 is executed, otherwise step 606 is executed.
Step 604, the second control circuit generates a signal for turning off the alternating current control module and sends the signal to the first control circuit; further, step 605 is performed.
Step 605, the first control circuit receives the signal of turning off the ac control module, and controls the device to be protected to stop transmitting energy to the outside based on the signal of turning off the ac control module; i.e. the connection of the ac control module to the device to be protected is broken.
Step 606, the second control circuit generates a closed alternating current control module signal and sends the closed alternating current control module signal to the first control circuit; further, step 607 is performed.
In step 607, the first control circuit receives the closed ac control module signal, and controls the device to be protected to transmit energy to the outside based on the closed ac control module signal, i.e. the connection between the ac control module and the device to be protected is communicated or continuously operated.
In the embodiment of the utility model, the utility model can adopt low-level protection. The judging module outputs a judging result; if the negative half-cycle voltage in the analog voltage corresponding to the sampled alternating current does not exceed the negative half-cycle set value, the positive half-cycle voltage in the analog voltage corresponding to the sampled alternating current does not exceed the positive half-cycle set value, and the first control circuit continues to work, namely the device to be protected is controlled to provide energy for the outside; if the negative half-cycle voltage in the analog voltage corresponding to the sampled alternating current exceeds the negative half-cycle set value or the positive half-cycle voltage in the analog voltage corresponding to the sampled alternating current exceeds the positive half-cycle set value, the first control circuit is turned off, and the device to be protected is controlled to stop providing energy to the outside.
In the several embodiments provided by the present utility model, it should be understood that the disclosed apparatus may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.
The units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present utility model may be integrated in one processing module, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.
The foregoing is merely illustrative embodiments of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present utility model, and the utility model should be covered.
Claims (10)
1. A protection circuit, the protection circuit comprising: a judgment circuit and a first control circuit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the judging circuit is used for converting alternating current output by the device to be protected into analog voltage and judging whether the device to be protected is overloaded or not or whether the device to be protected is short-circuited or not according to the analog voltage, so as to obtain a judging result;
and the first control circuit is used for controlling the device to be protected to externally transmit or stop transmitting energy according to the judging result.
2. The circuit of claim 1, wherein the protection circuit further comprises a second control circuit; the second control circuit is used for generating a corresponding control signal according to the judging result and sending the corresponding control signal to the first control circuit;
the first control circuit is further configured to control the device to be protected to externally transmit or stop transmitting energy according to the received control signal.
3. The circuit of claim 1, wherein the decision circuit comprises a sampling sub-circuit and a comparison sub-circuit;
the sampling sub-circuit is used for sampling the alternating current output by the device to be protected and outputting analog voltage corresponding to the sampled alternating current.
4. A circuit according to claim 3, wherein the comparison sub-circuit comprises a first comparison sub-circuit and a second comparison sub-circuit;
the first comparison sub-circuit is used for comparing the positive half-cycle part voltage in the analog voltage with a set value corresponding to a first voltage dividing resistor included in the first comparison sub-circuit;
the second comparison sub-circuit is used for comparing the negative half-cycle voltage in the analog voltage with a set value corresponding to a second voltage dividing resistor included in the second comparison sub-circuit.
5. A circuit according to claim 3, wherein the sampling sub-circuit comprises a hall element, a current limiting resistor, a filter capacitor and a supply capacitor;
the Hall element is used for sampling the alternating current output by the device to be protected, and calculating and outputting analog voltage corresponding to the sampled alternating current according to the potential difference corresponding to the magnetic field generated by the sampled alternating current; the current limiting resistor is used for protecting an output branch; the filter capacitor is used for filtering interference signals; the supply capacitor is used for providing electric energy for the sampling sub-circuit.
6. The circuit of claim 4, wherein the first comparison subcircuit further comprises a first operational amplifier comparator and a supply capacitor;
the first operational amplifier comparator is used for determining whether the positive half-cycle voltage in the analog voltage is larger than a set value corresponding to the first voltage dividing resistor; the supply capacitor is used for supplying power to the first comparison sub-circuit.
7. The circuit of claim 4, wherein the second comparison subcircuit further comprises a second operational amplifier comparator and a supply capacitor;
the second operational amplifier comparator is used for determining whether the voltage of the negative half-cycle part in the analog voltage is larger than a set value corresponding to the second voltage dividing resistor; the supply capacitor is used for supplying power to the second comparison sub-circuit.
8. The circuit of claim 2, wherein the control signal comprises a first control signal and a second control signal;
the first control circuit is further used for controlling the device to be protected to externally transmit energy according to the received first control signal;
the first control circuit is further used for controlling the device to be protected to stop transmitting energy to the outside according to the received second control signal.
9. An integrated circuit, characterized in that the protection circuit of any one of claims 1 to 8 is integrated.
10. An electronic device characterized in that the protection circuit according to any one of claims 1 to 8 is integrated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321180430.7U CN219960097U (en) | 2023-05-16 | 2023-05-16 | Protection circuit, integrated circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321180430.7U CN219960097U (en) | 2023-05-16 | 2023-05-16 | Protection circuit, integrated circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219960097U true CN219960097U (en) | 2023-11-03 |
Family
ID=88541053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321180430.7U Active CN219960097U (en) | 2023-05-16 | 2023-05-16 | Protection circuit, integrated circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219960097U (en) |
-
2023
- 2023-05-16 CN CN202321180430.7U patent/CN219960097U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9297862B2 (en) | Systems and apparatus for fault detection in DC power sources using AC residual current detection | |
| US7154277B2 (en) | Method and apparatus for detecting faults in AC to AC, or DC to AC power conversion equipments when the equipment is in a high impedance mode | |
| HU211049B (en) | Method and arrangement for measuring internal impedance of alternative current power supply unit | |
| CN103872759B (en) | The conversion method of discrimination of automatic transfer switching electric appliance controller and device | |
| CN101178426A (en) | Short circuit testing apparatus and method | |
| EP0881732A2 (en) | Apparatus for RMS current approximation | |
| US9541604B2 (en) | Loop powered isolated contact input circuit and method for operating the same | |
| US9910079B2 (en) | Grounding resistance measurement apparatus and method of operating the same | |
| CN219960097U (en) | Protection circuit, integrated circuit and electronic equipment | |
| CN111474401B (en) | High-voltage charged display device with fault detection function and fault detection method | |
| CN105305796A (en) | Frequency converter direct-current busbar overvoltage and under-voltage protection method and system | |
| CN112485731B (en) | Inverter for intelligently detecting wiring infirm of wiring terminal and wiring infirm detection method | |
| JP3448325B2 (en) | Islanding detection method for distributed power supply equipment | |
| EP3093720B1 (en) | Galvanically isolated current transmitter with self-adjustment on recognition of operating conditions | |
| CN209104785U (en) | A kind of current foldback circuit | |
| CN106093675A (en) | A kind of arc photosensor and arc light processing method | |
| CN220874215U (en) | Overcurrent protection circuit | |
| CN217034130U (en) | Power grid abnormity detection circuit and electric equipment | |
| CN220525896U (en) | Open-short circuit test circuit based on hardware short-term test | |
| WO2020011742A1 (en) | Ground fault detection circuit and apparatus | |
| CN218102571U (en) | Overcurrent protection circuit of off-grid inverter and full-bridge inverter circuit | |
| CN218629951U (en) | Circuit and controlling means convenient to load current detects | |
| CN111289852B (en) | Arc detection device and method | |
| CN216485243U (en) | Frequency detection device and electrical equipment | |
| CN213275794U (en) | Alternating current circuit sampling circuit and wireless charging system using same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |