CN212162801U - Lightning surge protection circuit of low-power circuit and television - Google Patents
Lightning surge protection circuit of low-power circuit and television Download PDFInfo
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- CN212162801U CN212162801U CN202020804064.8U CN202020804064U CN212162801U CN 212162801 U CN212162801 U CN 212162801U CN 202020804064 U CN202020804064 U CN 202020804064U CN 212162801 U CN212162801 U CN 212162801U
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Abstract
A lightning surge protection circuit of a low-power circuit and a television are disclosed, wherein a surge current suppression circuit is used for suppressing the surge current of the original alternating current output by an alternating current power supply to generate a first alternating current; the first common-mode suppression circuit performs common-mode noise suppression processing on the first alternating current; the first discharge circuit performs overcurrent discharge processing and overvoltage limiting processing on the first alternating current subjected to common-mode noise suppression processing by the first common-mode suppression circuit; the first differential mode suppression circuit performs differential mode noise suppression processing on alternating current output by the first bleeder circuit, outputs the alternating current subjected to the differential mode noise suppression processing to the rear-stage circuit, realizes effective suppression on power supply startup surge and lightning surge, performs effective common mode noise suppression and differential mode noise suppression on the alternating current, outputs the alternating current with low noise interference to the rear-stage circuit, realizes effective lightning surge protection, and is simple in circuit structure, small in size, capable of reducing the use of components and parts and saving cost.
Description
Technical Field
The application belongs to the technical field of lightning protection, and particularly relates to a lightning surge protection circuit of a low-power circuit and a television.
Background
At present, with the wide use of electronic devices and the continuous expansion of the application field of electronic devices, for example, from indoor to outdoor, from low area to high mountain, from land to sea, etc., the problem of overvoltage damage to electronic devices is getting more and more concerned, and the requirement of people on the protection capability of lightning surge of electronic devices is higher and higher, for example, a television is from 1KV to 2KV to 3KV in the previous lightning protection differential mode, and from 4KV to 5KV in the common mode, and the requirement is generally 2KV in the differential mode and 4KV in the common mode. Most brand television manufacturers can increase the requirements of differential mode 3KV, common mode 5KV and the like. Generally, the parts which are easily damaged by lightning strike include power supply parts such as rectifier bridge, switch tube and the like, and then small signal processing circuits such as CPU and the like, and since almost all the power supplies of the electronic equipment are located at the front end of the whole electronic equipment, the lightning strike surge protection capability of the power supplies is very important.
The traditional lightning protection surge solution is generally realized by adding a piezoresistor, the surge bearing capacity of the piezoresistor depends on the physical size of the piezoresistor, the television scheme generally requires adding the piezoresistor with the diameter of 14MM, the risk of fire is easily caused, and the circuit structure is complex and high in cost.
Therefore, the traditional technical scheme has the problems of complex circuit structure for preventing lightning surge, low cost performance and the like.
SUMMERY OF THE UTILITY MODEL
An object of the application is to provide a lightning surge protection circuit and a television of miniwatt circuit, aim at solving the problem that the circuit structure of traditional lightning surge protection is complicated, the price/performance ratio is not high etc.
The first aspect of the embodiment of the present application provides a lightning surge protection circuit of a low-power circuit, which is connected to an ac power supply and a rear-stage circuit, and the lightning surge protection circuit of the low-power circuit includes:
the surge current suppression circuit is connected with the alternating current power supply and is configured to perform surge current suppression on original alternating current output by the alternating current power supply so as to generate first alternating current;
the first common-mode suppression circuit is connected with the surge current suppression circuit and is configured to perform common-mode noise suppression processing on the first alternating current;
the first bleeder circuit is connected with the surge current suppression circuit, the first common mode suppression circuit and the post-stage circuit and is configured to perform over-current bleeder processing and over-voltage limiting processing on the first alternating current subjected to common mode noise suppression processing by the first common mode suppression circuit;
and the first differential mode suppression circuit is connected with the first bleeder circuit, the first common mode suppression circuit and the post-stage circuit, and is configured to perform differential mode noise suppression processing on the alternating current output by the first bleeder circuit and output the alternating current after the differential mode noise suppression processing to the post-stage circuit.
In one embodiment, the lightning surge protection circuit of the low power circuit further includes:
the first protection circuit is connected with the alternating current power supply and the surge current suppression circuit and is configured to perform over-current protection processing and over-temperature protection processing on the original alternating current;
the surge current suppression circuit is specifically configured to perform surge current suppression on the original alternating current after the overcurrent protection processing and the overtemperature protection processing to generate the first alternating current.
In one embodiment, the lightning surge protection circuit of the low power circuit further includes:
the second common mode suppression circuit is connected with the first common mode suppression circuit, the surge current suppression circuit and the first bleeder circuit and is configured to perform secondary common mode noise suppression processing on the first alternating current;
and a second bleeder circuit, connected to the ac power supply, the first common mode rejection circuit, the first differential mode rejection circuit, the second common mode rejection circuit, and a subsequent circuit, and configured to perform overcurrent bleeding processing and overvoltage limiting processing on the ac power subjected to the common mode noise rejection processing by the second common mode rejection circuit.
In one embodiment, the lightning surge protection circuit of the low power circuit further includes:
a third common mode rejection circuit, connected to the first bleeding circuit, the first common mode rejection circuit, the first differential mode rejection circuit, and the post-stage circuit, and configured to perform common mode noise rejection processing on the ac power output by the first differential mode rejection circuit;
a third bleeding circuit, connected to the first bleeding circuit, the first common-mode rejection circuit, the first differential-mode rejection circuit, the third common-mode rejection circuit, and the post-stage circuit, and configured to perform overcurrent bleeding processing and overvoltage limiting processing on the ac power output by the third common-mode rejection circuit;
and the fourth bleeder circuit is connected with the third common mode suppression circuit, the post-stage circuit, the first differential mode suppression circuit and the first common mode suppression circuit and is configured to perform overcurrent bleeding treatment and overvoltage limiting treatment on the alternating current output by the third bleeder circuit.
In one embodiment, the lightning surge protection circuit of the low power circuit further includes:
and the fourth common mode rejection circuit is connected with the third common mode rejection circuit, the third bleeder circuit, the fourth bleeder circuit and the post-stage circuit, and is configured to perform common mode noise rejection processing on the alternating current output by the third bleeder circuit.
In one embodiment, the inrush current suppression circuit includes: a thermistor; the first end of the thermistor is connected with the alternating current power supply, and the second end of the thermistor is connected with the first common mode suppression circuit.
In one embodiment, the thermistor has a diameter size of 12mm to 15 mm.
In one embodiment, the first common-mode rejection circuit includes: a first common mode inductor;
the first end of the first common-mode inductor and the second end of the first common-mode inductor are connected to the alternating current power supply and the first differential-mode suppression circuit in a sharing mode, and the third end of the first common-mode inductor and the fourth end of the first common-mode inductor are connected to the surge current suppression circuit, the first differential-mode suppression circuit and the rear-stage circuit in a sharing mode.
In one embodiment, the first differential mode suppression circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor;
the first end of the first resistor, the first end of the second resistor, and the first end of the first capacitor are connected to the first common mode suppression circuit and the subsequent circuit, the second end of the third resistor, the second end of the fourth resistor, and the second end of the first capacitor are connected to the first common mode suppression circuit, the first bleeder circuit, and the subsequent circuit, and the second end of the first resistor is connected to the first end of the third resistor, the second end of the second resistor, and the first end of the fourth resistor.
A second aspect of embodiments of the present application provides a television set comprising a lightning surge protection circuit of a low-power circuit as described in any of the above.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: the lightning surge protection circuit of the small power circuit performs surge current suppression on original alternating current output by an alternating current power supply through a surge current suppression circuit to generate first alternating current; the first common-mode suppression circuit performs common-mode noise suppression processing on the first alternating current; the first discharge circuit performs overcurrent discharge processing and overvoltage limiting processing on the first alternating current subjected to common mode noise suppression processing by the first common mode suppression circuit; the first differential mode suppression circuit performs differential mode noise suppression processing on alternating current output by the first bleeder circuit, outputs the alternating current subjected to the differential mode noise suppression processing to the post-stage circuit, achieves suppression on start-up surge caused by power supply start-up and lightning surge caused by lightning stroke, performs effective common mode noise suppression and differential mode noise suppression on the alternating current output by the alternating current power supply, outputs the alternating current with low noise interference to the post-stage circuit, achieves effective and reliable lightning surge protection, and is simple in circuit structure, small in size, capable of reducing the use of components and parts, and saving cost.
Drawings
Fig. 1 is a schematic structural diagram of a lightning surge protection circuit of a low-power circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another structure of a lightning surge protection circuit of a low-power circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of another structure of a lightning surge protection circuit of a low-power circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of another structure of a lightning surge protection circuit of a low-power circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another structure of a lightning surge protection circuit of a low-power circuit according to an embodiment of the present application;
FIG. 6 is a schematic circuit diagram of an exemplary lightning surge protection circuit of a low power circuit according to an embodiment of the present application;
fig. 7 is a schematic diagram of a test result of the NTC thermistor in the lightning surge protection circuit of the low-power circuit shown in fig. 1 for suppressing surge current in the circuit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a schematic structural diagram of a lightning surge protection circuit of a low-power circuit provided in a first embodiment of the present application, and for convenience of explanation, only the parts related to the present embodiment are shown, which are detailed as follows:
a lightning surge protection circuit of a low-power circuit is connected with an alternating current power supply 01 and a post-stage circuit 100, and comprises: surge current suppression circuit 11, first common mode suppression circuit 12, first bleeder circuit 13 and first differential mode suppression circuit 14.
The surge current suppression circuit 11 is connected with the alternating current power supply 01 and is configured to perform surge current suppression on original alternating current output by the alternating current power supply 01 so as to generate first alternating current; a first common mode suppression circuit 12 connected to the inrush current suppression circuit 11 and configured to perform common mode noise suppression processing on the first alternating current; a first bleeder circuit 13, connected to the inrush current suppression circuit 11, the first common mode suppression circuit 12, and the post-stage circuit 100, and configured to perform overcurrent bleeding processing and overvoltage limiting processing on the first alternating current power subjected to the common mode noise suppression processing by the first common mode suppression circuit 12; the first differential mode suppression circuit 14 is connected to the first bleeder circuit 13, the first common mode suppression circuit 12, and the subsequent circuit 100, and is configured to perform differential mode noise suppression processing on the alternating current output by the first bleeder circuit 13 and output the alternating current after the differential mode noise suppression processing to the subsequent circuit 100.
In specific implementation, the lightning surge protection circuit of the low-power circuit is mainly applied to the low-power circuit with the power within 85W so as to perform lightning surge protection. Optionally, the post-stage circuit 100 is a transformer circuit, and can perform voltage conversion, rectification, voltage stabilization and other processing on the ac power generated after the first differential-mode circuit 14 performs differential-mode noise suppression processing, so as to generate the required dc power to supply power to the electrical load. The surge current suppression circuit 11 is connected in series to a first output power line of the ac power supply, and is capable of performing surge current suppression on transient current surge (i.e., power-on surge) caused when the power supply is turned on, and performing surge current suppression on lightning surge generated by a lightning test when the lightning test is performed, so as to generate a first ac current. The first common mode suppression circuit 12 performs common mode noise suppression processing on the first alternating current, the first discharge circuit 13 performs overcurrent discharge processing and overvoltage limitation processing on the first alternating current subjected to the common mode noise suppression processing by the first common mode suppression circuit 12, the first differential mode suppression circuit 14 performs differential mode noise suppression processing on the alternating current generated after the overcurrent discharge processing and the overvoltage limitation processing are performed on the first discharge circuit 13, and the alternating current subjected to the differential mode noise suppression processing is output to the post-stage circuit 100, so that damage to the circuit caused by surge caused by power-on or lightning stroke of a power supply is prevented, and lightning stroke surge protection is realized. Meanwhile, during normal operation, the inrush current suppression circuit 11 can also divide the voltage of the original alternating current stably output by the alternating current power supply 01, and normal operation of the whole power supply circuit is not affected.
The embodiment of the application can realize surge current suppression of the starting surge caused by starting the power supply and the lightning surge caused by lightning stroke, and effectively suppress common mode noise and differential mode noise of the alternating current output by the alternating current power supply, so that the alternating current with low noise interference is output to a rear-stage circuit, effective lightning surge protection is realized, the circuit structure is simple, the size is small, the use of components is reduced, and the cost is saved.
Referring to fig. 2, in one embodiment, the lightning surge protection circuit of the low power circuit further includes: a first protection circuit 15.
The first protection circuit 15 is connected with the alternating current power supply 01 and the surge current suppression circuit 11 and is configured to perform overcurrent protection processing and overtemperature protection processing on original alternating current; the inrush current suppression circuit 11 is specifically configured to perform inrush current suppression on the original alternating current after the overcurrent protection processing and the overtemperature protection processing to generate the first alternating current.
In specific implementation, the first protection circuit 15 adopts a fuse or a fuse, so that overcurrent protection and overheat protection can be realized, the potential safety hazard of electricity utilization caused by overlarge current or overhigh temperature in the circuit is prevented, and the safety and reliability of the lightning surge protection circuit of the low-power circuit are improved.
Referring to fig. 3, in one embodiment, the lightning surge protection circuit of the small power circuit further includes: a second common mode rejection circuit 16 and a second bleed circuit 17.
A second common mode suppression circuit 16 connected to the first common mode suppression circuit 12, the inrush current suppression circuit 11, and the first bleed circuit 13, and configured to perform secondary common mode noise suppression processing on the first alternating current; the second bleeder circuit 17 is connected to the ac power supply 01, the first common mode suppression circuit 12, the first differential mode suppression circuit 14, the second common mode suppression circuit 16, and the post-stage circuit 100, and is configured to perform overcurrent bleeding processing and overvoltage limiting processing on the ac power subjected to the common mode noise suppression processing by the second common mode suppression circuit 16.
In a specific implementation, the second common mode rejection circuit 16 is connected in parallel with the first common mode rejection circuit 12 and the first bleed circuit 13, and performs a secondary common mode noise rejection process on the first ac power to filter out common mode noise interference carried in the first ac power for a second time. The second bleeder circuit 17 is used for performing overcurrent bleeder processing and overvoltage limiting processing again on the alternating current output after the second common mode noise suppression processing is performed on the alternating current by the second common mode suppression circuit 16, so that the safety and reliability of the lightning surge protection circuit of the low-power circuit are further improved. The first differential mode suppression circuit 14 performs common mode noise suppression processing on the alternating current output after the common mode suppression processing is performed on the first common mode suppression circuit 12 and the second common mode suppression circuit 16 and the overcurrent release processing and overvoltage limitation processing are performed on the alternating current output after the overcurrent release processing and the overvoltage limitation processing are performed on the first bleed circuit 16 and the second bleed circuit 17, and outputs the alternating current after the differential mode noise suppression processing to the post-stage circuit 100, so that the safety and reliability of the lightning surge protection circuit of the low-power circuit are further improved; meanwhile, alternating current with lower common mode noise interference and differential mode noise interference can be provided to the rear-stage circuit 100, so that normal and stable operation of the rear-stage voltage conversion circuit is guaranteed.
Referring to fig. 4, in one embodiment, the lightning surge protection circuit of the small power circuit further includes: a third common mode rejection circuit 18, a third bleed circuit 19, and a fourth bleed circuit 20.
A third common mode rejection circuit 18, connected to the first bleeding circuit 13, the first common mode rejection circuit 12, the first differential mode rejection circuit 14, and the post-stage circuit 100, and configured to perform common mode noise rejection processing on the ac power output by the first differential mode rejection circuit 14; a third bleeder circuit 19, connected to the first bleeder circuit 13, the first common mode suppression circuit 12, the first differential mode suppression circuit 14, the third common mode suppression circuit 18, and the post-stage circuit 100, and configured to perform overcurrent bleeding processing and overvoltage limiting processing on the ac power output by the third common mode suppression circuit 18; the fourth bleeder circuit 20 is connected to the third common mode rejection circuit 18, the post-stage circuit 100, the first differential mode rejection circuit 14, and the first bleeder circuit 13, and is configured to perform an overcurrent bleeding process and an overvoltage limiting process on the ac power output from the third bleeder circuit 19.
In a specific implementation, the third common mode rejection circuit 18 performs a common mode noise rejection process on the alternating current output by the first differential mode rejection circuit 14, that is, performs a third common mode noise rejection process on the first alternating current, so as to further filter out common mode noise interference carried in the first alternating current. The third bleeder circuit 19 and the fourth bleeder circuit 20 further perform overcurrent bleeder processing and overvoltage limiting processing on the alternating current output after the common mode noise suppression processing is performed on the third common mode suppression circuit 18, so that the current and the voltage in the circuit are kept in a safe and reliable range, the damage of transient impact current or voltage to the circuit is prevented, the lightning surge resistance performance of the lightning surge protection circuit of the low-power circuit is further improved, and the safety reliability and the practicability of the lightning surge protection circuit of the low-power circuit are improved.
Referring to fig. 5, in one embodiment, the lightning surge protection circuit of the small power circuit further includes: a fourth common mode rejection circuit 21.
The fourth common mode rejection circuit 21 is connected to the third common mode rejection circuit 18, the third bleeder circuit 19, the fourth bleeder circuit 20, and the post-stage circuit 100, and is configured to perform a common mode noise rejection process on the ac power output by the third bleeder circuit 19.
In a specific implementation, the third bleeder circuit 19 and the fourth bleeder circuit 20 perform over-current bleeder processing and over-voltage limiting processing on the ac power generated after the common-mode noise suppression processing is performed by the third common-mode suppression circuit 18, and output the ac power after the over-current bleeder processing and the over-voltage limiting processing to the fourth common-mode suppression circuit 21, the fourth common-mode suppression circuit 21 performs further common-mode noise suppression processing on the ac power to output the ac power to the post-stage circuit 100, that is, it can be understood that the fourth common-mode suppression circuit 21 can further perform common-mode noise suppression processing on the first ac power output by the inrush current suppression circuit 11 to further filter out common-mode noise interference carried in the first ac power, thereby reducing common-mode electromagnetic interference in the circuits, and outputting smooth, stable and reliable ac power to the post-stage circuit 100 to meet the safety power demand, the practicality of the lightning surge protection circuit of the low-power circuit is improved.
Referring to fig. 6, in one embodiment, the inrush current suppression circuit 11 includes a thermistor Rn 1; the first end of the thermistor Rn1 is connected to the ac power supply 01, and the second end of the thermistor Rn1 is connected to the first common mode suppression circuit 12.
In specific implementation, the thermistor Rn1 is a negative temperature coefficient thermistor, that is, the thermistor Rn1 is an NTC thermistor. Since the thermistor is usually composed of a specially processed polymer resin and a conductor, the polymer resin can keep the conductor in a crystalline structure to form a conductor together, but the resistance of the conductor is low under normal conditions, and if the passing current is increased sharply, the circuit is affected, the temperature of each device is increased, the conductor in the polymer resin is separated, so that high resistance is formed, the abnormal impact current can be effectively controlled, and the circuit is prevented from being damaged. Therefore, the thermistor Rn1 is connected in series to the live wire of the ac power supply 01, so that the surge current is effectively controlled when a lightning surge occurs, overcurrent protection is realized, and the rear-stage circuit 100 is prevented from being damaged by the power-on surge and the lightning surge.
In the present embodiment, the diameter of the thermistor Rn1 is optionally 12mm to 15 mm. Furthermore, the diameter of the thermistor Rn1 is 13mm, compared with the conventional technical scheme that a thermistor Rn1 with the diameter of 10mm is adopted, the diameter of the thermistor is increased in packaging, so that the rated resistance of the thermistor is increased, and the variation amplitude of the resistance is reduced along with each temperature change, therefore, after the heat engine is subjected to overall aging treatment, namely after the time of simulating a user to use electrical equipment after starting up and starting up, when a lightning stroke test is performed, the impact current generated by the lightning stroke test or the impact current generated by the superposition of the impact current generated by the lightning stroke test and the impact current generated during starting up is performed, after passing through a lightning stroke surge protection circuit of a low-power circuit, the lightning stroke requirement of a differential mode 3KV surge and a common mode 5KV can still be met, and the lightning stroke protection performance requirement of the differential mode 3KV surge and the common mode 5; meanwhile, the parameters such as the retest standby power and the like also meet the requirements, the test result is shown in fig. 7, fig. 7 shows a schematic diagram of the test result of suppressing the surge current in the circuit by using the NTC thermistor, the horizontal axis is time, the vertical axis is the current in the circuit, the dotted line a is the surge current before the NTC thermistor Rn1 is not used, and the solid line b is the surge current after the NTC thermistor Rn1 is used. Therefore, by adjusting and using the NTC thermistor Rn1 with a larger diameter size, the startup surge current and the lightning surge current can be effectively inhibited, the startup surge protection and the lightning surge protection can be effectively and reliably performed, and the rear-stage circuit 100 is prevented from being damaged by the startup surge and the lightning surge. The lightning surge protection circuit does not need to use a piezoresistor, reduces the complexity of the lightning surge protection circuit of the low-power circuit, reduces the use of components and saves the cost.
Referring to fig. 6, in one embodiment, the first common mode suppression circuit 12 includes: a first common mode inductance PLF 1; the first terminal 1 of the first common mode inductor PLF1 and the second terminal 2 of the first common mode inductor PLF1 are commonly connected to the ac power supply 01 and the first differential mode suppression circuit 14, and the third terminal 3 of the first common mode inductor PLF1 and the fourth terminal 4 of the first common mode inductor PLF1 are commonly connected to the inrush current suppression circuit 11, the first differential mode suppression circuit 14 and the post-stage circuit 100.
In a specific implementation, the common mode inductor is also called a common mode choke. The first common-mode inductor PLF1 and the first differential-mode suppression circuit 14 are connected in parallel between the live line L and the neutral line N of the ac power supply 01, and serve as a bidirectional filter, which can filter out common-mode electromagnetic interference on a signal line, and can suppress electromagnetic interference emitted outward, so that common-mode EMI signals (i.e., common-mode electromagnetic signals) on the line can be controlled at a very low level, and normal operation of other electronic devices in the same electromagnetic environment is not affected.
Optionally, the second common mode rejection circuit 16 includes a second common mode inductor PLF2, and the third common mode rejection circuit 18 includes a third common mode inductor PLF3, which can perform effective common mode noise rejection on the alternating current in the lightning surge protection circuit passing through the low-power circuit, so as to eliminate and reject common mode electromagnetic interference, and provide stable and reliable alternating current for the post-stage circuit 100.
Referring to fig. 6, in one embodiment, the first differential mode suppression circuit 14 includes: a first resistor R3, a second resistor R4, a third resistor R5, a fourth resistor R6 and a first capacitor CX 1; the first end of the first resistor R3, the first end of the second resistor R4, and the first end of the first capacitor CX1 are connected to the first common mode suppression circuit 12 and the subsequent circuit 100, the second end of the third resistor R5, the second end of the fourth resistor R6, and the second end of the first capacitor CX1 are connected to the first common mode suppression circuit 12, the first bleeder circuit 13, and the subsequent circuit 100, and the second end of the first resistor R3 is connected to the first end of the third resistor R5, the second end of the second resistor R4, and the first end of the fourth resistor R6.
In specific implementation, the first capacitor CX1 is a safety X capacitor, and is connected in parallel between two power lines of the ac power supply 01, that is, connected in parallel between the live line L and the zero line N of the ac power supply 01, and is connected in parallel with the first common mode inductor PLF1, and the maximum operating current is limited by a capacitive reactance generated by the safety X capacitor CX1 at a certain ac signal frequency, so as to play a role in limiting current and dynamically distributing voltage at two ends of a load, thereby realizing differential mode noise suppression on the ac power and suppressing differential mode interference in the ac power. Optionally, the safety X capacitor CX1 is a metalized film capacitor, and the capacitance is of the uF level. The first resistor R3, the second resistor R4, the third resistor R5 and the fourth resistor R6 are the discharge resistors of the safety X capacitor CX1, and play a role in discharging electric charges, so that the first differential mode suppression circuit 14 can bear overvoltage impact.
In one embodiment, referring to fig. 6, the fourth common mode rejection circuit 21 includes: a first safety Y capacitor CY1 and a second safety Y capacitor CY 2; the first end of the first safety Y capacitor CY1 is connected to the post-stage circuit 100, the third common mode rejection circuit 18 and the fourth bleeder circuit 20, the second end of the first safety Y capacitor CY1 is connected to the power ground, the first end of the second safety Y capacitor CY2 is connected to the post-stage circuit 100, the third common mode rejection circuit 18 and the third bleeder circuit 19, and the second end of the second safety Y capacitor CY2 is connected to the power ground.
The first safety Y capacitor CY1 and the second safety Y capacitor CY2 are both connected in series between a power line of the alternating current power supply 01 and a power ground, and the two Y capacitors are connected in series to improve the withstand voltage value between the power line and the ground and prevent the withstand voltage of the safety Y capacitor from not meeting the application requirements. The first safety Y capacitor CY1 and the second safety Y capacitor CY2 can reduce the influence of the common mode current on the output, that is, the influence of the common mode current on the subsequent circuit 100.
Optionally, the first safety Y capacitor CY1 and the second safety Y capacitor CY2 are high-voltage ceramic capacitors.
In one embodiment, the first bleeding circuit 13 includes: a resistor R1 and a first discharge tooth PD 1; the first end of the resistor R1 and the first end of the first discharge tooth PD1 are connected to the surge current suppression circuit 11 in common, and the second end of the resistor R1 and the second end of the first discharge tooth PD1 are connected to the first differential mode suppression circuit 14 and the third bleeder circuit 19 in common.
In specific implementation, a first end of the resistor R1 and a first end of the first discharge tine PD1 are connected to a second end of the thermistor Rn1, a second end of the resistor R1 and a second end of the first discharge tine PD1 are connected to a second end of the third resistor R5, and the resistor R1 and the first discharge tine PD1 are both connected in parallel to the first common mode inductor PLF 1. The first discharge teeth PD1 are saw-toothed bare copper foils and play a role similar to a discharge tube, and the cost of the discharge teeth is much lower than that of the discharge tube, so that the cost is saved, and the cost performance of a lightning surge protection circuit of a low-power circuit is improved.
The common mode inductor has the advantages that high voltage is generated at two ends of the common mode inductor when the switching power supply surge test or the lightning surge test or the ESD static test is carried out, flashover occurs, a discharge tube or a piezoresistor is connected to the common mode inductor in parallel to limit the voltage of the common mode inductor, so that the arc extinguishing effect is achieved, the flashover is effectively prevented from damaging components close to the periphery of the common mode inductor, therefore, the resistor R1 and the first discharge tooth PD1 can eliminate the flashover generated by the first common mode inductor PLF1 in the lightning surge test process, the voltage is clamped to the maximum surge voltage not exceeding the allowable surge voltage output to the rear-stage circuit 100 through the discharge tooth PD1 discharge, and the reliability and the practicability of the lightning protection circuit of the low-power circuit are improved.
In one implementation, the second bleed circuit 17 includes a resistor R2 and a second discharge tine PD 2. The third bleed circuit 19 employs a third discharge tine PD 3. The fourth bleed circuit 20 employs a fourth discharge tine PD 4. The working principle of the second bleeder circuit 17, the third bleeder circuit 19 and the fourth bleeder circuit 20 is similar to that of the first bleeder circuit 13, and please refer to the above description, which is not repeated herein, so as to suppress the flashover generated by the second common mode inductor PLF2 and the third common mode inductor PLF3 in the lightning surge or the power-on surge, and further improve the reliability and the practicability of the lightning surge protection circuit of the low-power circuit.
In one embodiment, the first protection circuit 15 uses a fuse PF1, which can perform overcurrent protection and over-temperature protection on the lightning surge protection circuit of the low-power circuit.
A second aspect of embodiments of the present application provides a television set comprising a lightning surge protection circuit of a low-power circuit as described in any of the above.
In a specific implementation, the size of the optional television is less than or equal to 43 inches, and the power is within 85W. The lightning surge protection circuit of the low-power circuit is applied to the television with the size within 43 inches and the power within 85W, and can effectively protect the television from lightning surge.
The utility model discloses the TV set can realize effectual start surge and thunderbolt surge protection to carry out effectual common mode noise suppression and differential mode noise suppression to the alternating current of alternating current power supply output, reduce the electromagnetic interference in the circuit of TV set, make the product can toward little volume development, practiced thrift the cost, the sexual valence relative altitude.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the functional units, modules and circuits described above are illustrated as being divided into different functional units, modules and circuits, and in practical applications, the functions may be divided into different functional units, modules and circuits according to different requirements, that is, the internal structure of the device may be divided into different functional units, modules or circuits to complete all or part of the functions described above. In the embodiments, each functional unit, module, and circuit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units, modules and circuits are only used for distinguishing one from another, and are not used for limiting the protection scope of the present application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application 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; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A lightning surge protection circuit of a low-power circuit is connected with an alternating current power supply and a post-stage circuit, and is characterized by comprising:
the surge current suppression circuit is connected with the alternating current power supply and is configured to perform surge current suppression on original alternating current output by the alternating current power supply so as to generate first alternating current;
the first common-mode suppression circuit is connected with the surge current suppression circuit and is configured to perform common-mode noise suppression processing on the first alternating current;
the first bleeder circuit is connected with the surge current suppression circuit, the first common mode suppression circuit and the post-stage circuit and is configured to perform over-current bleeder processing and over-voltage limiting processing on the first alternating current subjected to common mode noise suppression processing by the first common mode suppression circuit;
and the first differential mode suppression circuit is connected with the first bleeder circuit, the first common mode suppression circuit and the post-stage circuit, and is configured to perform differential mode noise suppression processing on the alternating current output by the first bleeder circuit and output the alternating current after the differential mode noise suppression processing to the post-stage circuit.
2. The small power circuit lightning surge protection circuit according to claim 1, further comprising:
the first protection circuit is connected with the alternating current power supply and the surge current suppression circuit and is configured to perform over-current protection processing and over-temperature protection processing on the original alternating current;
the surge current suppression circuit is specifically configured to perform surge current suppression on the original alternating current after the overcurrent protection processing and the overtemperature protection processing to generate the first alternating current.
3. The small power circuit lightning surge protection circuit according to claim 1, further comprising:
the second common mode suppression circuit is connected with the first common mode suppression circuit, the surge current suppression circuit and the first bleeder circuit and is configured to perform secondary common mode noise suppression processing on the first alternating current;
and a second bleeder circuit, connected to the ac power supply, the first common mode rejection circuit, the first differential mode rejection circuit, the second common mode rejection circuit, and a subsequent circuit, and configured to perform overcurrent bleeding processing and overvoltage limiting processing on the ac power subjected to the common mode noise rejection processing by the second common mode rejection circuit.
4. The small power circuit lightning surge protection circuit according to claim 1, further comprising:
a third common mode rejection circuit, connected to the first bleeding circuit, the first common mode rejection circuit, the first differential mode rejection circuit, and the post-stage circuit, and configured to perform common mode noise rejection processing on the ac power output by the first differential mode rejection circuit;
a third bleeding circuit, connected to the first bleeding circuit, the first common-mode rejection circuit, the first differential-mode rejection circuit, the third common-mode rejection circuit, and the post-stage circuit, and configured to perform overcurrent bleeding processing and overvoltage limiting processing on the ac power output by the third common-mode rejection circuit;
and the fourth bleeder circuit is connected with the third common mode suppression circuit, the post-stage circuit, the first differential mode suppression circuit and the first common mode suppression circuit and is configured to perform overcurrent bleeding treatment and overvoltage limiting treatment on the alternating current output by the third bleeder circuit.
5. The small power circuit lightning surge protection circuit according to claim 4, wherein the small power circuit lightning surge protection circuit further comprises:
and the fourth common mode rejection circuit is connected with the third common mode rejection circuit, the third bleeder circuit, the fourth bleeder circuit and the post-stage circuit, and is configured to perform common mode noise rejection processing on the alternating current output by the third bleeder circuit.
6. The small power circuit lightning surge protection circuit according to claim 1, wherein the surge current suppression circuit comprises: a thermistor; the first end of the thermistor is connected with the alternating current power supply, and the second end of the thermistor is connected with the first common mode suppression circuit.
7. The small power circuit lightning surge protection circuit according to claim 6, wherein the thermistor has a diameter size of 12mm to 15 mm.
8. The small power circuit lightning surge protection circuit of claim 1, wherein the first common mode suppression circuit comprises: a first common mode inductor;
the first end of the first common-mode inductor and the second end of the first common-mode inductor are connected to the alternating current power supply and the first differential-mode suppression circuit in a sharing mode, and the third end of the first common-mode inductor and the fourth end of the first common-mode inductor are connected to the surge current suppression circuit, the first differential-mode suppression circuit and the rear-stage circuit in a sharing mode.
9. The small power circuit lightning surge protection circuit of claim 1, wherein the first differential mode suppression circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor;
the first end of the first resistor, the first end of the second resistor, and the first end of the first capacitor are connected to the first common mode suppression circuit and the subsequent circuit, the second end of the third resistor, the second end of the fourth resistor, and the second end of the first capacitor are connected to the first common mode suppression circuit, the first bleeder circuit, and the subsequent circuit, and the second end of the first resistor is connected to the first end of the third resistor, the second end of the second resistor, and the first end of the fourth resistor.
10. A television set, characterized in that it comprises a lightning surge protection circuit of a low-power circuit according to any of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020804064.8U CN212162801U (en) | 2020-05-14 | 2020-05-14 | Lightning surge protection circuit of low-power circuit and television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020804064.8U CN212162801U (en) | 2020-05-14 | 2020-05-14 | Lightning surge protection circuit of low-power circuit and television |
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| CN212162801U true CN212162801U (en) | 2020-12-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824088A (en) * | 2021-09-29 | 2021-12-21 | 深圳市智微智能科技股份有限公司 | Input power supply protection circuit and device of direct current type POE switch |
| WO2022217811A1 (en) * | 2021-04-15 | 2022-10-20 | 中山大洋电机股份有限公司 | Direct-current brushless motor controller having lightning protection and surge protection circuit |
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2020
- 2020-05-14 CN CN202020804064.8U patent/CN212162801U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022217811A1 (en) * | 2021-04-15 | 2022-10-20 | 中山大洋电机股份有限公司 | Direct-current brushless motor controller having lightning protection and surge protection circuit |
| US11804798B2 (en) | 2021-04-15 | 2023-10-31 | Zhongshan Broad-Ocean Motor Co., Ltd. | DC brushless motor controller comprising lightning protection and surge protection circuit |
| CN113824088A (en) * | 2021-09-29 | 2021-12-21 | 深圳市智微智能科技股份有限公司 | Input power supply protection circuit and device of direct current type POE switch |
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