CN114678829A - Protection circuits and electronic equipment - Google Patents
Protection circuits and electronic equipment Download PDFInfo
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- CN114678829A CN114678829A CN202210187687.9A CN202210187687A CN114678829A CN 114678829 A CN114678829 A CN 114678829A CN 202210187687 A CN202210187687 A CN 202210187687A CN 114678829 A CN114678829 A CN 114678829A
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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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a protection circuit and electronic equipment, the said protection circuit connects to the power input end and protected the product input end, including: the rectification voltage-stabilizing module is connected with the power supply input end; the protection module is respectively connected with the rectifying and voltage-stabilizing module and the input end of the protected product and comprises a voltage dividing unit, a first switching unit, a second switching unit and a third switching unit; when the input voltage is higher than the power supply voltage of the protected product, the voltage dividing unit divides the input voltage, so that the second switching unit is conducted and the first switching unit and the third switching unit are not conducted to perform power-off protection on the protected product. According to the invention, through the protection module, systematic damage caused by the fact that a user mistakenly accesses a high voltage into the low voltage input system is avoided, and the safety of the low voltage power supply system and the user side equipment is ensured.
Description
Technical Field
The invention relates to the field of power protection, in particular to a protection circuit and electronic equipment.
Background
The power supply voltage of the low-voltage input system on the market is generally 12 Vdc-24 Vdc. However, the low-voltage input system is often inadvertently connected with the high voltage of 220V to 50Hz, so that the product fails due to high-voltage breakdown. Moreover, because the low-voltage input system is designed to be low-voltage, when high voltage is accessed, the product is necessarily damaged, more damaged devices are needed, the possibility of maintenance is low, or unnecessary maintenance is caused by overhigh maintenance cost.
Disclosure of Invention
The invention provides a protection circuit and electronic equipment, which are used for solving the problem that devices of a low-voltage input system are damaged due to the fact that high voltage is connected in the prior art.
In a first aspect, the present invention provides a protection circuit, which is connected between a power input terminal and an input terminal of a protected product, and includes:
the rectification and voltage stabilization module is connected with the power supply input end and is provided with a first output end used for outputting a first voltage and a second output end used for outputting a second voltage, and the second voltage is input voltage of the protected product input end;
the protection module is respectively connected with the rectification voltage-stabilizing module and the input end of the protected product and comprises a voltage dividing unit, a first switching unit and a second switching unit which are respectively connected with the voltage dividing unit and a third switching unit which is connected with the first switching unit, and the third switching unit is connected between the second output end and the input end of the protected product in series;
when the input voltage is higher than the power supply voltage of the protected product, the voltage dividing unit divides the input voltage to enable the second switch unit to be conducted and the first switch unit to be not conducted, and then the third switch unit is in a non-conducting state to conduct power-off protection on the protected product.
In an embodiment of the present invention, the voltage dividing unit includes a first voltage dividing unit and a second voltage dividing unit, the second switch unit is a second triode, the first switch unit is a first triode, a second voltage output by the second output terminal is divided by the second voltage dividing unit and then output to a base of the second triode, an emitter of the second triode is grounded, a collector of the second triode is connected to a base of the first triode, a first voltage output by the first output terminal is divided by the first voltage dividing unit and then output to the base of the first triode, the emitter of the first triode is grounded, and the collector of the first triode is connected to a control terminal of the third switch unit to control on/off of the third switch unit.
In an embodiment of the present invention, the first voltage dividing unit includes a second resistor and a third resistor, the second voltage dividing unit includes a fourth resistor and a fifth resistor, one end of the second resistor is connected to the second output terminal, the other end of the second resistor is connected to the third resistor, the other end of the third resistor is grounded, one end of the fourth resistor is connected to the first output terminal, the other end of the fourth resistor is connected to the fifth resistor, and the other end of the fifth resistor is grounded.
In an embodiment of the present invention, the protection module further includes a second voltage regulator tube, a cathode of the second voltage regulator tube is connected to the second resistor, an anode of the second voltage regulator tube is connected to the third resistor, and a breakdown voltage of the second voltage regulator tube is greater than a maximum value of a power supply voltage of the protected product.
In an embodiment of the present invention, the third switching unit is a relay, a first end of the relay is connected to the second output end, a second end of the relay is connected to the first output end, a third end of the relay is connected to the input end of the protected product, and a fourth end of the relay is connected to a collector of the first triode.
In an embodiment of the present invention, the protection module further includes a second capacitor, one end of the second capacitor is connected to the base of the first triode, and the other end of the second capacitor is grounded.
In an embodiment of the present invention, the rectifying and voltage-stabilizing module includes a voltage-stabilizing unit, the voltage-stabilizing unit includes a first resistor, a first voltage-stabilizing tube, and a first capacitor, the first resistor is connected to a cathode of the first voltage-stabilizing tube, an anode of the first voltage-stabilizing tube is grounded, one end of the first capacitor is connected to the first output terminal, and the other end of the first capacitor is grounded, the voltage-stabilizing unit is configured to stabilize the first voltage, and the first voltage is equal to a breakdown voltage of the first voltage-stabilizing tube.
In an embodiment of the present invention, the rectifying and voltage-stabilizing module further includes a rectifying unit, the rectifying unit includes a rectifying bridge and an electrolytic capacitor, an input terminal of the rectifying bridge is connected to the power input terminal, the output end of the rectifier bridge is respectively connected with the anode of the electrolytic capacitor, the first resistor and the second output end, the cathode of the electrolytic capacitor is grounded, the rectifier bridge comprises a first diode, a second diode, a third diode and a fourth diode, a third connection node between the third diode and the fourth diode is grounded, a fourth connection node between the first diode and the second diode is used as an output end of the rectifier bridge, a fifth connection node between the second diode and the fourth diode is connected to a first terminal of the power input terminal, a sixth connection node between the first diode and the third diode is connected with the second end of the power input terminal.
In an embodiment of the present invention, the protection circuit further includes a fuse, and the fuse is connected to the voltage input terminal.
In a second aspect, the present invention further provides an electronic device, where the electronic device includes the protection circuit according to any one of the first aspects and the electronic device, and through the protection module, the systematic damage caused by the user mistakenly accessing a high voltage to a low voltage input system is avoided, and the safety of a low voltage power supply system and a user end device is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
Fig. 1 is a block diagram of a protection circuit provided in the present invention;
FIG. 2 is a circuit schematic of a protection circuit provided by the present invention;
FIG. 3 is a schematic diagram of an emulation circuit of the protection circuit provided by the present invention;
FIG. 4 is a diagram showing simulation results of 12V voltage of the protection circuit provided by the present invention;
FIG. 5 is a diagram illustrating simulation results of a 24V voltage of the protection circuit provided by the present invention;
fig. 6 is a schematic diagram of a simulation structure of a 220V voltage of the protection circuit provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein.
The power supply is used as power supply equipment of an electronic product, the protection circuit is an indispensable component of the power supply product, the traditional control method can perform overcurrent protection through the fuse, and when the current reaches the fuse fusing current, the fuse can be fused to form cut-off due to overcurrent, so that the whole circuit is powered off, and the effect of protecting the circuit is achieved. However, when the circuit power supply is turned off by adopting a fuse fusing mode, the fused fuse cannot be self-repaired, and the circuit can be protected again only once after being fused and needs to be replaced.
In order to solve the problem that devices of a low-voltage input system are damaged due to the fact that a high voltage is connected in the prior art, the invention provides the protection circuit and the electronic equipment.
The protection circuit and the electronic device of the present invention are described below with reference to fig. 1 to 6.
Fig. 1 is a block diagram of a protection circuit according to the present invention, as shown in fig. 1. A protection circuit is connected between a power input end and an input end of a protected product and comprises a rectification voltage-stabilizing module and a protection module.
Illustratively, the rectifying and voltage-stabilizing module is connected to the power input end and performs a rectifying and voltage-stabilizing function, and the rectifying and voltage-stabilizing module has a first output end and a second output end, the first output end is used for outputting a first voltage, the second output end is used for outputting a second voltage, and the second voltage is an input voltage of the input end of the protected product.
Illustratively, one end of the protection module is connected with the rectifying and voltage-stabilizing module, and the other end of the protection module is connected with the input end of the protected product, and the protection module may include a voltage dividing unit, a first switching unit and a second switching unit respectively connected with the voltage dividing unit, and a third switching unit connected with the first switching unit, where the third switching unit is connected in series between the second output end and the input end of the protected product.
When the input voltage is within the power supply voltage range of the protected product, the input voltage is rectified and stabilized by the rectifying and voltage stabilizing module, and then divided by the voltage dividing unit to provide proper voltage, so that the first switching unit is conducted, the third switching unit is conducted and works, and the required working voltage can be output to the protected product.
When input voltage is higher than the power supply voltage scope of protected product, input voltage carries out rectification, steady voltage back through rectification voltage stabilization module, after carrying out the partial pressure through the bleeder unit for the second switch unit is switched on, because switching on of second switch unit can lead to first switch unit's voltage to draw low, thereby makes first switch unit not switch on, and then also leads to the third switch unit to be in the non-conducting state and out of work, so protection circuit's output just has no voltage, can't output voltage extremely promptly protected product, thereby reaches the protection the purpose of protected product.
Illustratively, the first switching unit is a first triode, the second switching unit is a second triode, and the third switching unit is a relay.
It should be noted that, the first switch unit, the second switch unit, and the third switch unit of the present invention may also use other components according to actual circuit requirements, and the present invention does not limit the switch units.
The protection circuit according to the present invention is described below with an embodiment.
Fig. 2 is a schematic circuit diagram of a protection circuit provided by the present invention, as shown in fig. 2. A protection circuit comprises a power input end of Vin1, an output end of Vin2 connected with the input end of a protected product, a rectifying and voltage-stabilizing module and a protection module.
Illustratively, the rectifying and voltage-stabilizing module comprises a rectifying unit and a voltage-stabilizing unit, wherein the rectifying unit comprises a rectifying bridge BD and an electrolytic capacitor EC1, and the voltage-stabilizing unit comprises a first resistor R1, a first voltage-stabilizing tube ZD1 and a first capacitor C1. The output of the rectifying and voltage stabilizing module comprises a first voltage (V1) and a second voltage, and the second voltage is an input voltage Vin2 of the input end of the protected product.
The rectifier bridge BD comprises a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, a third connection node C between the third diode D3 and the fourth diode D4 is grounded, a fourth connection node D between the first diode D1 and the second diode D2 serves as an output end of the rectifier bridge BD, a fifth connection node E between the second diode D2 and the fourth diode D4 is connected with a first end of a power input end Vin1, and a sixth connection node F between the first diode D1 and the third diode D3 is connected with a second end of the power input end Vin 1.
The input terminals of the rectifier bridge BD (i.e., the first terminal connected to the fifth connection node E and the second terminal connected to the sixth connection node F) are the power input terminal Vin 1. The output end of the rectifier bridge BD is respectively connected with the positive pole (+) of an electrolytic capacitor EC1 and a first resistor R1, the negative pole (-) of the electrolytic capacitor EC1 is grounded, the first resistor R1 is connected with the cathode of a first voltage-regulator tube ZD1, the anode of the first voltage-regulator tube ZD1 is grounded, one end of the first capacitor C1 is connected with a first connection node A between the first resistor R1 and the first voltage-regulator tube ZD1, and the other end of the first capacitor C1 is grounded. The voltage stabilizing unit is configured to stabilize a voltage of a first connection node a (i.e., a voltage of V1 in fig. 3, which is also a first voltage output by the rectifying and voltage stabilizing module), where the voltage of the first connection node a is equal to a breakdown voltage of the first zener diode ZD 1.
Illustratively, the protection module includes a second resistor R2, a second voltage regulator ZD2, a third resistor R3, a second transistor Q2, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, a first transistor Q1, and a relay K1.
The first voltage division unit formed by the second resistor R2 and the third resistor R3 is used as a voltage division and current limiting resistor of the second triode Q2, and the second voltage division unit formed by the fourth resistor R4 and the fifth resistor R5 is used as a voltage division and current limiting resistor of the first triode Q1.
One end of the second resistor R2 is connected with the output end of the rectifier bridge BD, the other end of the second resistor R2 is connected with the cathode of the second voltage-regulator tube ZD2, the anode of the second voltage-regulator tube ZD2 is connected with the third resistor R3, and the other end of the third resistor R3 is grounded. The breakdown voltage of the second zener ZD2 is greater than the maximum value of the supply voltage of the protected product. For example, the supply voltage of the protected product is 12V-24Vdc, and the breakdown voltage of the second regulator ZD2 needs to be greater than 24V to avoid the circuit from operating abnormally due to false triggering.
The base electrode of the second triode Q2 is connected with the anode of the second voltage regulator tube ZD2, the emitter electrode of the second triode Q2 is grounded, and the collector electrode of the second triode Q2 is connected to the second connection node B between the fourth resistor R4 and the fifth resistor R5. One end of the fourth resistor R4 is connected to the first connection node a, the other end of the fourth resistor R4 is connected to the fifth resistor R5, and the other end of the fifth resistor R5 is grounded.
One end of the second capacitor C2 is connected to the second connection node B, and the other end of the second capacitor C2 is grounded.
The first end of the relay K1 is connected with the output end of the rectifier bridge BD, the second end of the relay K1 is connected with the first connection node A, the output end of the relay K1 is Vin2, the output end Vin2 (the third end) is connected with the input end of a protected product, and the fourth end of the relay K1 is connected with the first triode Q1.
The base electrode of the first triode Q1 is connected with the second connection node B, the emitting electrode of the first triode Q1 is grounded, and the collecting electrode of the first triode Q1 is connected with the fourth end of the relay K1.
As can be seen from fig. 2, the second voltage output by the second output terminal of the rectifying and voltage-stabilizing module is divided by the second voltage-dividing unit and then output to the base of the second transistor Q2, the emitter of the second transistor Q2 is grounded, and the collector of the second transistor Q2 is connected to the base of the first transistor Q1; the first voltage output by the first output end of the rectifying and voltage-stabilizing module is divided by the first voltage dividing unit and then output to the base electrode of the first triode Q1, the emitting electrode of the first triode Q1 is grounded, and the collecting electrode of the first triode Q1 is connected with the control end of the relay K1 so as to control the on/off of the relay K1.
Exemplarily, the protection circuit of the present invention further includes a FUSE connected to the fifth connection node E. When the protection circuit is short-circuited, for example, the rectifier bridge BD is short-circuited, or the electrolytic capacitor EC1 is short-circuited, the FUSE is blown.
The working principle of the protection circuit is as follows:
the power input terminal Vin1 is normally input with a low-voltage dc voltage (for example, 12V-24V dc voltage), and then regulated by the first voltage-regulator tube ZD1 and then divided by the fourth resistor R4 and the fifth resistor R5 to provide a suitable voltage, and at the same time, a suitable current is supplied by the fourth resistor R4, so that the first triode Q1 is turned on, the relay K1 is closed, that is, the working voltage (V1) at one end of the coil of the relay K1 is normal, the base voltage (V2) of the first triode Q1 is normal, the voltage (V3) at the other end of the coil of the relay K1 is normal, and the base voltage (V4) of the second triode Q2 is 0 at the beginning, the Q2 is not turned on, and the output terminal Vin2 has a voltage, and can supply power to the following circuits.
Because the voltage of the second voltage regulator ZD2 is higher than that of the normal dc input voltage, the second triode Q2 does not operate, and the first triode Q1 is not affected.
When the power input terminal Vin1 is connected to a voltage higher than a power supply voltage of a protected product by mistake (for example, 220V-/50 Hz is input), the second triode Q2 is turned on after voltage division is performed through the second resistor R2, the second voltage-regulator tube ZD2 and the third resistor R3, due to the existence of the first capacitor C1, a base voltage (V4) of the second triode Q2 is established earlier than a base voltage (V2) of the first triode Q1, after the second triode Q2 is turned on, a base voltage (V2) of the first triode Q1 is pulled down, so that the first triode Q1 cannot be turned on, and at the moment, a working voltage (V1) at one end of the coil of the relay K1 is the same as a voltage (V3) at the other end of the coil of the relay K1, so that the relay K1 cannot be turned on, the relay K1 does not work, and the output terminal 2 does not have voltage, thereby achieving the purpose of protecting a circuit behind.
It should be noted that the breakdown voltage of the second zener diode ZD2 must be greater than the highest voltage of the voltage input terminal Vin1, so as to avoid the circuit from being out of operation due to open error.
Fig. 3 is a schematic diagram of a simulation circuit of the protection circuit provided by the present invention, as shown in fig. 3. The first voltage V1 is an operating voltage of one end (i.e., the second end) of the coil of the relay K1, the second voltage V2 is a base voltage of the first transistor Q1, the third voltage V3 is a voltage of the other end (i.e., the fourth end) of the coil of the relay K1, the third voltage V3 is used for confirming whether the first transistor Q1 is turned on (e.g., below a predetermined voltage, it indicates turning on), and the fourth voltage V4 is a base voltage of the second transistor Q2.
Assume that the voltage input at the voltage input terminal is 220 Vac. The four diodes D1-D4 in the simulation circuit are equivalent to the rectifier bridge BD in FIG. 2, the withstand voltage of the rectifier bridge BD needs to meet the condition of high-voltage input, 600V or more can be selected, and the current magnitude can be evaluated according to the loss of practical application.
The electrolytic capacitor EC1 is a filter capacitor after rectification, and its capacitance value can be selected according to the required ripple size, and its withstand voltage is selected to meet the high-voltage input, for example, 400V or more. The capacitance value of the electrolytic capacitor EC1 shown in fig. 3 is 22 μ F.
The first resistor R1 is used as a current limiting resistor of the first voltage regulator ZD1, the voltage across it should be greater than 320V, and the resistance value of the first resistor R1 shown in fig. 3 is 10 k. The first zener ZD1 may select the appropriate power based on the losses at the input of a preset maximum voltage (e.g. the normal grid voltage, which may reach 264V, higher than 220V), which is shown in fig. 3 as the voltage value of the first zener ZD1 of 5V.
The first capacitor C1 ensures that the first voltage V1 in fig. 3 is maintained within the rated voltage range of the relay K1, so the capacitance of the capacitor C1 must be greater than 10 μ F. The second capacitor C2 is used as a delay timing for the rising of the second voltage V2 in fig. 3 to ensure that the fourth voltage V4 is established before the second voltage V2 under the condition of high-voltage input, otherwise the protection circuit will lose the protection effect. The capacitance value of the second capacitor C2 shown in fig. 3 is 1 μ F.
The second resistor R2 and the third resistor R3 are used as voltage dividing and current limiting resistors of the second transistor Q2, the resistance of the second resistor R2 shown in fig. 3 is 1k, and the resistance of the third resistor R3 is 10 k. The fourth resistor R4 and the fifth resistor R5 are used as voltage dividing and current limiting resistors of the first transistor Q1, the resistance of the fourth resistor R4 shown in fig. 3 is 10k, and the resistance of the fifth resistor R5 is 50 k.
The breakdown voltage of the second voltage-regulator tube ZD2 needs to be greater than the maximum value of the power supply voltage of the protected product, for example, the power supply voltage is 12V-24 Vdc, then the voltage of the second voltage-regulator tube ZD2 needs to be greater than 24V, and a certain margin is kept, so that the abnormal operation of the circuit caused by false triggering can be avoided. The voltage value of the second zener tube ZD2 shown in figure 3 is 33V, i.e. 33V is greater than 24V.
The following is a diagram based on the results of the simulation circuit shown in fig. 3 described above.
Fig. 4 is a schematic diagram of a simulation result of 12V voltage of the protection circuit provided by the present invention, as shown in fig. 4. The simulation circuit results of fig. 4 show that when a voltage of 12Vdc is inputted, relay K1 operates normally and the line is normal.
Fig. 5 is a schematic diagram of a simulation result of a 24V voltage of the protection circuit provided by the present invention, as shown in fig. 5. The simulation results of fig. 5 show that relay K1 works normally with the 24Vdc voltage input, and the line is normal.
Fig. 6 is a schematic diagram of a simulation structure of a 220V voltage of the protection circuit provided by the present invention, as shown in fig. 6. The simulation result of fig. 6 shows that, when the 220Vac voltage is input, the fourth voltage V4 is established earlier than the second voltage V2, and then the second voltage V2 is pulled low, so that the first triode Q1 cannot be turned on, at this time, the voltage values of the first voltage V1 and the third voltage V3 are both about 5V, the relay K1 does not work, the circuit is disconnected, and the rear circuit can be protected, so that the protected product can be protected.
The abscissa in fig. 4 to 6 represents time, and the ordinate represents voltage.
Exemplarily, the present invention further provides an electronic device including the protection circuit as described above.
Illustratively, the electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm computer, a wearable device, a pedometer, or other electronic devices.
Because the electronic equipment provided by the invention comprises any protection circuit provided by the embodiment part of the protection circuit, the electronic equipment provided by the embodiment of the invention can realize the same functions as any protection circuit provided by the embodiment part of the protection circuit.
It should be noted that, in the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element described by the phrase "comprising" does not exclude the presence of other identical elements in processes, methods, articles, or devices that comprise the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210187687.9A CN114678829A (en) | 2022-02-28 | 2022-02-28 | Protection circuits and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210187687.9A CN114678829A (en) | 2022-02-28 | 2022-02-28 | Protection circuits and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118508370A (en) * | 2024-07-22 | 2024-08-16 | 江苏恒力化纤股份有限公司 | DC 24V power supply control circuit protection device |
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