CN1458723B - power protection device - Google Patents

power protection device Download PDF

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CN1458723B
CN1458723B CN 02119351 CN02119351A CN1458723B CN 1458723 B CN1458723 B CN 1458723B CN 02119351 CN02119351 CN 02119351 CN 02119351 A CN02119351 A CN 02119351A CN 1458723 B CN1458723 B CN 1458723B
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power
threshold value
control signal
current
power supply
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CN1458723A (en
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许家彰
陈彦仲
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Prolific Technology Inc
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Abstract

The invention discloses a power supply protection device, which comprises a power switch unit, a surge protection unit, a leakage current protection unit and an overcurrent protection unit, wherein the power switch unit is used for cutting off the power supply of an alternating current power supply according to a circuit breaking control signal, the surge protection unit is used for outputting the circuit breaking control signal when a surge is generated, the leakage current protection unit is used for outputting the circuit breaking control signal when the leakage current is generated, and the overcurrent protection unit is used for outputting the circuit breaking control signal according to the current value or the energy when the overcurrent is generated. The invention has the functions of surge protection, leakage current protection and overcurrent protection, has smaller volume and can save more cost than the traditional power supply protection device. And can provide more accurate and safe protection by detecting the over-current according to the energy.

Description

电源保护装置power protection device

技术领域technical field

本发明涉及一种电源保护装置。The invention relates to a power protection device.

背景技术Background technique

随着科技的日新月异，一般民众的日常生活也愈来愈倚重电器用品，例如计算机、洗衣机、微波炉、冷气机与冰箱等等，带给民众莫大的方便并且提高了生活的品质。然而水能载舟，亦能覆舟，随着用电量增加，可能的危险也是愈大。一般用电发生异常的现象有过电流(overload)、漏电流(leakage)与突波(surge)。过电流是指所使用的电器的总电流量过大，致使有电线走火的危险。漏电流常发生于高湿度环境，如浴室等，使得电流流经人体造成触电，一般在8mA以上即有触电的感觉。突波是指突然有短暂的高压出现，导致电器毁损。传统电源保护装置是针对这些电源异常现象单独发展相对应的电源保护装置，例如以保险丝(fuse)构成突波保护装置以避免突波损害，另外对于过电流也有用保险丝、机械式过电流开关(Mechanical Overload Switch)、或以电路侦测方法组成保护装置。然而传统电源保护装置分别仅能保护上述问题中的一种问题，若需对多种电源异常现象同时具有保护作用则需购置多种不同功能的电源保护装置，使得采购成本增加，也增加了建构电源保护系统的困难。With the rapid development of technology, the daily life of ordinary people is increasingly relying on electrical appliances, such as computers, washing machines, microwave ovens, air conditioners and refrigerators, etc., which bring great convenience to the people and improve the quality of life. However, water can carry a boat, and it can also overturn it. As the power consumption increases, the possible danger is also greater. Generally, abnormal phenomena in electricity consumption include overcurrent (overload), leakage current (leakage) and surge (surge). Overcurrent means that the total current of the electrical appliances used is too large, resulting in the danger of wires catching fire. Leakage current often occurs in high-humidity environments, such as bathrooms, etc., causing the current to flow through the human body and cause electric shock. Generally, there is a feeling of electric shock when it is above 8mA. Surge refers to the sudden appearance of short-term high voltage, resulting in damage to electrical appliances. The traditional power protection device is to develop the corresponding power protection device independently for these power abnormalities. For example, a fuse (fuse) is used to form a surge protection device to avoid surge damage. In addition, a fuse, a mechanical overcurrent switch ( Mechanical Overload Switch), or a protection device composed of a circuit detection method. However, traditional power protection devices can only protect one of the above-mentioned problems. If it is necessary to protect multiple power abnormalities at the same time, it is necessary to purchase a variety of power protection devices with different functions, which increases the purchase cost and construction. Difficulties with power protection systems.

发明内容Contents of the invention

本发明所要解决的技术问题在于提出一种可对多种电源异常现象同时具有保护作用的电源保护装置。The technical problem to be solved by the present invention is to propose a power supply protection device capable of simultaneously protecting various power supply anomalies.

本发明所提供的技术方案是：一种电源保护装置，其包括电源开关单元及多个电源异常现象保护单元，如突波保护单元、漏电流保护单元和过电流保护单元等。其中，电源开关单元与交流电源耦接，用以依据断路控制信号切断交流电源的供电。突波保护单元与交流电源及电源开关单元耦接，用以避免突波的产生，当突波保护单元侦测到交流电源的电压大于突波门坎值时，突波保护单元即输出断路控制信号。漏电流保护单元与交流电源及电源开关单元耦接，用以避免交流电源产生漏电流，其中，漏电流保护单元接收交流电源的火线与地线之间的电流差值，并与漏电流门坎值比较，若火线与地线的电流值的差值大于漏电流门坎值，即输出断路控制信号。过电流保护单元与交流电源及电源开关单元耦接，用以避免交流电源产生过电流，其中，过电流保护单元依据交流电源输出的电流值或交流电源输出的能量决定是否输出断路控制信号。The technical solution provided by the present invention is: a power supply protection device, which includes a power switch unit and a plurality of power supply anomaly protection units, such as a surge protection unit, a leakage current protection unit, and an overcurrent protection unit. Wherein, the power switch unit is coupled with the AC power supply, and is used for cutting off the power supply of the AC power supply according to the disconnection control signal. The surge protection unit is coupled with the AC power supply and the power switch unit to avoid the generation of surges. When the surge protection unit detects that the voltage of the AC power source is greater than the surge threshold, the surge protection unit outputs a circuit breaker control signal . The leakage current protection unit is coupled with the AC power supply and the power switch unit to avoid the leakage current generated by the AC power supply. In comparison, if the difference between the current values of the live wire and the ground wire is greater than the leakage current threshold, a disconnection control signal is output. The overcurrent protection unit is coupled with the AC power supply and the power switch unit to prevent the AC power supply from generating overcurrent. The overcurrent protection unit determines whether to output a circuit breaker control signal according to the current value output by the AC power supply or the energy output by the AC power supply.

本发明所公开的电源保护装置可同时对多种电源异常现象，如突波、漏电流、过电流等同时具有保护作用，比起传统电源保护装置的体积更小，更能节省成本。且对于过电流还可以依据能量进行过电流侦测，从而可以提供更准确安全的保护。The power supply protection device disclosed in the present invention can simultaneously protect various abnormal power supply phenomena, such as surge, leakage current, overcurrent, etc., and is smaller in size than traditional power supply protection devices, and can save costs. Moreover, overcurrent detection can also be performed based on energy, thereby providing more accurate and safe protection.

附图说明Description of drawings

为让本发明之上述目的、特征和优点能更明显易懂，下文特举一较佳实施例，并配合所附图式，作详细说明。In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, a preferred embodiment will be described in detail below together with the accompanying drawings.

图1为本发明较佳实施例的电路方块图；Fig. 1 is the circuit block diagram of preferred embodiment of the present invention;

图2为本发明较佳实施例进一步的详细电路方块图。FIG. 2 is a further detailed circuit block diagram of a preferred embodiment of the present invention.

图中标号说明：Explanation of symbols in the figure:

100：电源保护装置            160：过电流保护单元100: Power protection device 160: Overcurrent protection unit

110：电源开关单元            164：模拟/数字转换器110: Power switch unit 164: Analog/digital converter

120：突波保护单元            166：积分器120: surge protection unit 166: integrator

122：电压感应器              170：过载时间计算器122: Voltage sensor 170: Overload time calculator

124、144、168：杂讯过滤器20  172：异常时间计算器124, 144, 168: Noise Filter 20 172: Abnormal Time Calculator

126：突波比较器              174：立即比较器126: Surge comparator 174: Immediate comparator

140：漏电流保护单元          176：异常比较器140: Leakage current protection unit 176: Abnormal comparator

142、162：电流感应器         178：过载比较器142, 162: Current sensor 178: Overload comparator

146：漏电流比较              180：电子用品146: Leakage current comparison 180: Electronics

具体实施方式Detailed ways

请参照图1与图2，其所示为本发明一较佳实施例的一种电源保护装置的方块图。电源保护装置100与交流电源AC及电子用品180耦接，用以在发生异常供电时切断电源以保护电子用品180。电源保护装置100包括电源开关单元110、突波保护单元120、漏电流保护单元140、过电流保护单元160。电源开关单元110与交流电源AC耦接，当电源开关单元110接收到断路控制信号C即切断交流电源AC的供电。Please refer to FIG. 1 and FIG. 2 , which are block diagrams of a power protection device according to a preferred embodiment of the present invention. The power protection device 100 is coupled to the AC power supply and the electronic appliance 180 , and is used to cut off the power supply to protect the electronic appliance 180 when an abnormal power supply occurs. The power protection device 100 includes a power switch unit 110 , a surge protection unit 120 , a leakage current protection unit 140 , and an overcurrent protection unit 160 . The power switch unit 110 is coupled to the AC power supply AC, and when the power switch unit 110 receives the disconnection control signal C, it cuts off the power supply of the AC power supply AC.

突波保护单元120与交流电源AC及电源开关单元110耦接，用以避免突波的产生。该突波保护单元120接收交流电源AC的电压，将交流电源AC电压与突波门坎值Sth比较，若交流电源AC电压大于突波门坎值Sth，即输出断路控制信号C。The surge protection unit 120 is coupled to the AC power supply AC and the power switch unit 110 to prevent surges. The surge protection unit 120 receives the voltage of the AC power supply AC, compares the voltage of the AC power supply AC with the surge threshold Sth, and outputs a circuit breaker control signal C if the AC power supply AC voltage is greater than the surge threshold Sth.

漏电流保护单元140与交流电源AC及电源开关单元110耦接，用以避免交流电源AC产生漏电流。该漏电流保护单元140接收火线F与地线G间的电流值，若火线F与地线G间的电流的差值大于漏电流门坎值Lth，即输出断路控制信号C。The leakage current protection unit 140 is coupled to the AC power source AC and the power switch unit 110 for preventing the AC power source AC from generating leakage current. The leakage current protection unit 140 receives the current value between the live wire F and the ground wire G, and outputs a circuit breaker control signal C if the current difference between the live wire F and the ground wire G is greater than the leakage current threshold value Lth.

过电流保护单元160与交流电源AC及电源开关单元110耦接，当交流电源AC产生过量电流时，即输出断路控制信号C。The overcurrent protection unit 160 is coupled to the AC power supply AC and the power switch unit 110 , and outputs a circuit breaker control signal C when the AC power supply AC generates an excessive current.

请参照图2，其所示为电源保护装置100进一步的详细方块图。交流电源AC包括火线F与地线G。突波保护单元120包括电压感应器122、杂讯过滤器124和突波比较器126。电压感应器122与交流电源AC耦接，用以接收交流电源AC的电压并经由杂讯过滤器124过滤杂讯后转换为电压信号Ds。突波比较器126用以比较电压信号Ds与突波门坎值Sth，若电压信号Ds大于突波门坎值Sth即输出断路控制信号C。其中，突波比较器126为数字式比较器。Please refer to FIG. 2 , which is a further detailed block diagram of the power protection device 100 . The alternating current power supply AC includes a fire wire F and a ground wire G. The surge protection unit 120 includes a voltage sensor 122 , a noise filter 124 and a surge comparator 126 . The voltage sensor 122 is coupled to the AC power source AC, and is used for receiving the voltage of the AC power source AC, filtering the noise through the noise filter 124 and converting it into a voltage signal Ds. The surge comparator 126 is used for comparing the voltage signal Ds with the surge threshold Sth, and outputs the disconnection control signal C if the voltage signal Ds is greater than the surge threshold Sth. Wherein, the surge comparator 126 is a digital comparator.

漏电流保护单元140包括电流感应器142、杂讯过滤器144和漏电流比较器146。电流感应器142与交流电源AC耦接，用以接收火线F与地线G的电流值，并将火线F与地线G的电流的差值放大后输出至杂讯过滤器144，经杂讯过滤器144过滤杂讯后输出漏电流放大信号A。漏电流比较器146与电源开关单元110耦接，用以比较漏电流放大信号A与漏电流门坎值Lth，若漏电流放大信号A大于漏电流门坎值Lth即输出断路控制信号C。一般而言，人体对于8mA至22mA之间的电流即有触电的感觉，因此漏电流门坎值Lth可以与之对应介于这个区间。其中，漏电流比较器146为模拟式比较器。The leakage current protection unit 140 includes a current sensor 142 , a noise filter 144 and a leakage current comparator 146 . The current sensor 142 is coupled with the AC power supply to receive the current value of the live wire F and the ground wire G, and amplify the difference between the currents of the live wire F and the ground wire G and output it to the noise filter 144, through the noise The filter 144 outputs the leakage current amplified signal A after filtering the noise. The leakage current comparator 146 is coupled to the power switch unit 110 for comparing the leakage current amplified signal A with the leakage current threshold value Lth, and outputs the disconnection control signal C if the leakage current amplification signal A is greater than the leakage current threshold value Lth. Generally speaking, the human body feels an electric shock when the current is between 8mA and 22mA, so the leakage current threshold Lth can be correspondingly within this range. Wherein, the leakage current comparator 146 is an analog comparator.

过电流保护单元160包括立即断电元件、短时间异常元件与长时间过载元件。以一般的电线而言，例如其规格为10A，当立即断电元件侦测到过大的电流，如20A时，即采取立即断电的保护措施。立即断电元件包括电流感应器162、模拟/数字转换器164、杂讯过滤器168与立即比较器174。电流感应器162与交流电源AC耦接，用以接收交流电源AC的电流值并经由模拟/数字转换器164转换为数字信号Da。杂讯过滤器168将数字信号Da过滤杂讯后输出数字信号Da’并馈入立即比较器174；立即比较器174将数字信号Da’与立即门坎值OI比较，若数字信号Da’大于立即门坎值OI时，即输出断路控制信号C。其中，立即门坎值约为20A。The overcurrent protection unit 160 includes an immediate power-off element, a short-time abnormal element, and a long-time overload element. For a common electric wire, for example, its specification is 10A, when the immediate power-off device detects an excessive current, such as 20A, it will take protective measures for immediate power-off. The immediate power-off components include a current sensor 162 , an analog/digital converter 164 , a noise filter 168 and an immediate comparator 174 . The current sensor 162 is coupled to the AC power source AC for receiving the current value of the AC power source AC and converting it into a digital signal Da through the analog/digital converter 164 . The noise filter 168 filters the digital signal Da to output the digital signal Da' after filtering the noise and feeds it into the immediate comparator 174; the immediate comparator 174 compares the digital signal Da' with the immediate threshold value OI, if the digital signal Da' is greater than the immediate threshold When the value is OI, the circuit breaker control signal C is output. Among them, the immediate threshold value is about 20A.

而在10A至20A之间的电流在短暂时间内尚不至于造成危险，因此可以视一段时间内所累积的能量而决定采取短时间异常或长时间过载的保护措施。例如12A的电流可容许存在的时间即大于18A的电流可容许存在的时间，因此依据在一段时间内所释放的能量来决定是否断电可以得到更佳的保护效果。本实施例通过短时间异常元件与长时间过载元件，分别计算在短时间间隔Ts及长时间间隔Tl中交流电源AC所释放的能量，以此作为是否断路的依据，以提供短时间异常与长时间过载的保护措施，且并不限于分为两种时间间隔。However, the current between 10A and 20A will not cause danger in a short period of time, so it can be decided to take short-term abnormality or long-term overload protection measures according to the energy accumulated in a period of time. For example, the allowable time for a current of 12A is greater than the allowable time for a current of 18A. Therefore, a better protection effect can be obtained by deciding whether to cut off the power according to the energy released within a period of time. In this embodiment, the energy released by the AC power supply AC in the short time interval Ts and the long time interval T1 is calculated respectively by using the short-time abnormal element and the long-time overload element, as the basis for whether to open the circuit, so as to provide short-time abnormal and long-term Time overload protection measures, and not limited to two time intervals.

短时间异常元件包括电流感应器162、模拟/数字转换器164、积分器166、异常时间计算器172与异常放大器176。积分器166接收数字信号Da，将数字信号Da平方后对时间区间Δt积分，以输出能量信号E。异常时间计算器172接收能量信号E，计算一短时间间隔Ts所累积的能量SI并输出。异常比较器176用以比较能量SI与异常门坎值OS，若能量SI大于异常门坎值OS，即输出断路控制信号C。其中，短时间间隔Ts约介于3秒至5秒之间。The short-time abnormal components include a current sensor 162 , an analog/digital converter 164 , an integrator 166 , an abnormal time calculator 172 and an abnormal amplifier 176 . The integrator 166 receives the digital signal Da, squares the digital signal Da and integrates the time interval Δt to output the energy signal E. The abnormal time calculator 172 receives the energy signal E, calculates and outputs the energy SI accumulated in a short time interval Ts. The abnormality comparator 176 is used to compare the energy SI with the abnormality threshold OS. If the energy SI is greater than the abnormality threshold OS, it outputs the circuit breaker control signal C. Wherein, the short time interval Ts is approximately between 3 seconds and 5 seconds.

长时间过载元件包括电流感应器162、模拟/数字转换器164、积分器166、过载时间计算器170与过载比较器178。过载时间计算器170接收能量信号E，并计算长时间间隔Tl所累积的能量LI并输出。过载比较器178用以比较能量LI与过载电流门坎值OL；若能量LI大于过载电流门坎值OL即输出断路控制信号C。其中，长时间间隔Tl约介于3分钟至5分钟之间。其中，本例中的电流感应器162和模拟/数字转换器164由立即断电元件、短时间异常元件及长时间过载元件所共享；积分器166由短时间异常元件与长时间过载元件所共用。The long-time overload components include a current sensor 162 , an analog/digital converter 164 , an integrator 166 , an overload time calculator 170 and an overload comparator 178 . The overload time calculator 170 receives the energy signal E, and calculates and outputs the accumulated energy LI for the long time interval T1. The overload comparator 178 is used to compare the energy LI with the overload current threshold OL; if the energy LI is greater than the overload current threshold OL, it outputs a circuit breaker control signal C. Wherein, the long time interval T1 is approximately between 3 minutes and 5 minutes. Among them, the current sensor 162 and the analog/digital converter 164 in this example are shared by the immediate power-off element, the short-time abnormal element and the long-time overload element; the integrator 166 is shared by the short-time abnormal element and the long-time overload element .

传统的电源保护装置若需达到可以提供突波保护、漏电流保护与过电流保护的目的需有三个不同目的的电源保护装置组成，而本发明可将此三种电源保护装置合而为一，因此可以减小体积，更能节省成本。且本发明的过电流保护单元可依据一时间间隔内所消耗的能量多少作为是否异常的判断依据，因此可以提供更准确更安全的电源保护功能。If the traditional power protection device needs to achieve the purpose of providing surge protection, leakage current protection and over-current protection, it needs to be composed of three power protection devices with different purposes, and the present invention can combine these three power protection devices into one, Therefore, the volume can be reduced and the cost can be saved. Moreover, the overcurrent protection unit of the present invention can judge whether it is abnormal according to the amount of energy consumed within a time interval, so it can provide a more accurate and safer power protection function.

Claims (19)

1. an apparatus for protecting power supply couples with an AC power, and this AC power comprises a live wire and a ground wire, it is characterized in that: this device comprises
One power switch unit couples with this AC power, in order to cut off this ac power supply according to the control signal that opens circuit;
One leakage current protected location, couple with this AC power and this power switch unit, in order to avoid this AC power to produce leakage current, wherein, this leakage current protected location receives the current value of this live wire and this ground wire and compares with a leakage current threshold value, if the current value difference of this live wire and this ground wire is promptly exported this control signal that opens circuit greater than this leakage current threshold value; This leakage current protected location comprises:
One current inductor couples with this AC power, in order to export one second current value according to the live wire of this AC power and the electric current difference of ground wire; And
One leakage current comparator receives this second current value, if this second current value is promptly exported this control signal that opens circuit greater than this leakage current threshold value;
One overcurrent protection unit, couple with this AC power and this power switch unit, in order to avoid this AC power to produce overcurrent, wherein, whether this overcurrent protection unit exports this control signal that opens circuit according to one of the current value of this AC power output and energy of this AC power output with decision; This overcurrent protection unit comprises:
One assembly that cuts off the power supply immediately, when this component inspection that cuts off the power supply immediately to the current value of this AC power greater than one immediately during threshold value, promptly export this control signal that opens circuit, this assembly that cuts off the power supply immediately comprises:
One current inductor couples with this AC power, in order to export one first current value of this AC power;
One analog/digital converter receives this first current value and is converted to a digital signal; And
One comparator immediately couples with this analog/digital converter and this power switch unit, in order to this digital signal relatively and this threshold value immediately, if this digital signal greater than this immediately threshold value promptly export this control signal that opens circuit.
2. apparatus for protecting power supply according to claim 1 is characterized in that: this assembly that cuts off the power supply immediately comprises that also a noise filter element is with this digital signal filtering noise information.
3. apparatus for protecting power supply according to claim 1; it is characterized in that: this overcurrent protection unit comprises unusual assembly of a short time; the energy of exporting in a short time interval to this AC power when unusual component inspection of this short time is during greater than a unusual threshold value; promptly export this control signal that opens circuit, this short time, unusual assembly comprised
One current inductor couples with this AC power, in order to export one first current value of this AC power;
One analog/digital converter receives this first current value and is converted to a digital signal;
One integrator receives this digital signal, with after the digital signal square to a time interval integral, to export an energy signal;
One abnormal time calculator receives this energy signal, calculates a short time energy and output that a short time interval is accumulated; And
One unusual comparator is in order to relatively should a short time energy and a unusual threshold value, if this short time energy is promptly exported this control signal that opens circuit greater than this unusual threshold value.
4. apparatus for protecting power supply according to claim 1; it is characterized in that: this overcurrent protection unit comprises a long term overloading assembly; when this long term overloading component inspection to this AC power one long-time at interval in the energy of output when transshipping threshold value greater than one; promptly export this control signal that opens circuit, this long term overloading assembly comprises
One current inductor couples with this AC power, in order to export one first current value of this AC power;
One analog/digital converter receives this first current value and is converted to a digital signal;
One integrator receives this digital signal, with after the digital signal square to a time interval integral, to export an energy signal;
One overload time calculator, the received energy signal calculates a long-time long-time energy of being accumulated at interval and an output; And
One overload comparator transships threshold value in order to this long-time energy relatively and this, promptly exports this control signal that opens circuit as if this long-time energy greater than this overload threshold value.
5. apparatus for protecting power supply according to claim 1 is characterized in that: this leakage current protected location also comprises the noise of a noise filter with this second current value of filtering.
6. an apparatus for protecting power supply couples with an AC power, and this AC power comprises a live wire and a ground wire, it is characterized in that: this device comprises
One power switch unit couples with this AC power, in order to open circuit control signal and cut off the power supply of this AC power according to one;
One surging protected location, couple with this AC power and this power switch unit, in order to avoiding the generation of surging, the voltage that detects this AC power when this surging protected location is during greater than a surging threshold value, and this surging protected location is promptly exported this control signal that opens circuit; This surging protected location comprises:
One voltage sensor is in order to the voltage that receives this AC power and be converted to a voltage signal; And
One surging comparator receives this voltage signal and this surging threshold value, if this voltage signal is promptly exported this control signal that opens circuit greater than this surging threshold value;
One leakage current protected location, couple with this AC power and this power switch unit, in order to avoid this AC power to produce leakage current, wherein, this leakage current protected location receives the current value of this live wire and this ground wire and compares with a leakage current threshold value, if the current value difference of this live wire and this ground wire is promptly exported this control signal that opens circuit greater than this leakage current threshold value; This leakage current protected location comprises:
One current inductor couples with this AC power, in order to export one second current value according to the live wire of this AC power and the electric current difference of ground wire; And
One leakage current comparator receives this second current value, if this second current value is promptly exported this control signal that opens circuit greater than this leakage current threshold value;
One overcurrent protection unit, couple with this AC power and this power switch unit, in order to avoid this AC power to produce overcurrent, wherein, whether this overcurrent protection unit exports this control signal that opens circuit according to one of the current value of this AC power output and energy of this AC power output with decision; This overcurrent protection unit comprises:
One assembly that cuts off the power supply immediately, when this component inspection that cuts off the power supply immediately to the current value of this AC power greater than one immediately during threshold value, promptly export this control signal that opens circuit, this assembly that cuts off the power supply immediately comprises:
One current inductor couples with this AC power, in order to export one first current value of this AC power;
One analog/digital converter receives this first current value and is converted to a digital signal; And
One comparator immediately couples with this analog/digital converter and this power switch unit, in order to this digital signal relatively and this threshold value immediately, if this digital signal greater than this immediately threshold value promptly export this control signal that opens circuit.
7. apparatus for protecting power supply according to claim 6 is characterized in that; This assembly that cuts off the power supply immediately comprises that also a noise filter element is with this digital signal filtering noise information.
8. apparatus for protecting power supply according to claim 6; it is characterized in that: this overcurrent protection unit comprises unusual assembly of a short time; the energy of exporting in a short time interval to this AC power when unusual component inspection of this short time is during greater than a unusual threshold value; promptly export this control signal that opens circuit, this short time, unusual assembly comprised:
One current inductor couples with this AC power, in order to export one first current value of this AC power;
One analog/digital converter receives this first current value and is converted to a digital signal;
One integrator receives this digital signal, with after the digital signal square to a time interval integral, to export an energy signal;
One abnormal time calculator receives this energy signal, calculates a short time energy and output that a short time interval is accumulated; And
One unusual comparator is in order to relatively should a short time energy and a unusual threshold value, if this short time energy is promptly exported this control signal that opens circuit greater than this unusual threshold value.
9. apparatus for protecting power supply according to claim 6; it is characterized in that: this overcurrent protection unit comprises a long term overloading assembly; when this long term overloading component inspection to this AC power in one long-time at interval in the energy of output when transshipping threshold value greater than one; promptly export this control signal that opens circuit, this long term overloading assembly comprises
One current inductor couples with this AC power, in order to export one first current value of this AC power;
One analog/digital converter receives this first current value and is converted to a digital signal;
One integrator receives this digital signal, with after the digital signal square to a time interval integral, to export an energy signal;
One overload time calculator receives this energy signal, calculates a long-time long-time energy of being accumulated at interval and an output; And
One overload comparator transships threshold value in order to this long-time energy relatively and, promptly exports this control signal that opens circuit as if this long-time energy greater than this overload threshold value.
10. apparatus for protecting power supply according to claim 6 is characterized in that: this leakage current protected location also comprises the noise of a noise filter with this second current value of filtering.
11. apparatus for protecting power supply according to claim 6 is characterized in that: this surging protected location also comprises the noise of a noise filter with this voltage signal of filtering.
12. an apparatus for protecting power supply couples with an AC power, this AC power comprises a live wire and a ground wire, it is characterized in that: this device comprises
One power switch unit couples with this AC power, in order to open circuit control signal and cut off the power supply of this AC power according to one;
One surging protected location, couple with this AC power and this power switch unit, in order to avoiding the generation of surging, the voltage that detects this AC power when this surging protected location is during greater than a surging threshold value, and this surging protected location is promptly exported this control signal that opens circuit; This surging protected location comprises:
One voltage sensor is in order to the voltage that receives this AC power and be converted to a voltage signal; And
One surging comparator receives this voltage signal and this surging threshold value, if this voltage signal is promptly exported this control signal that opens circuit greater than this surging threshold value;
One leakage current protected location, couple with this AC power and this power switch unit, in order to avoid this AC power to produce leakage current, wherein, this leakage current protected location receives the current value of this live wire and this ground wire and compares with a leakage current threshold value, if the difference of the current value of this live wire and this ground wire is promptly exported this control signal that opens circuit greater than this leakage current threshold value; This leakage current protected location comprises:
One current inductor couples with this AC power, in order to export one second current value according to the live wire of this AC power and the electric current difference of ground wire; And
One leakage current comparator receives this second current value, if this second current value is promptly exported this control signal that opens circuit greater than this leakage current threshold value.
13. apparatus for protecting power supply according to claim 12 is characterized in that: this leakage current protected location also comprises the noise of a noise filter with this second current value of filtering.
14. apparatus for protecting power supply according to claim 12 is characterized in that: this surging protected location also comprises the noise of a noise filter with this voltage signal of filtering.
15. an apparatus for protecting power supply couples with an AC power, this AC power comprises a live wire and a ground wire, it is characterized in that: this device comprises
One power switch unit couples with this AC power, in order to open circuit control signal and cut off the power supply of this AC power according to one;
One surging protected location, couple with this AC power and this power switch unit, in order to avoiding the generation of surging, the voltage that detects this AC power when this surging protected location is during greater than a surging threshold value, and this surging protected location is promptly exported this control signal that opens circuit; This surging protected location comprises
One voltage sensor is in order to the voltage that receives this AC power and be converted to a voltage signal; And
One surging comparator receives this voltage signal and this surging threshold value, if this voltage signal is promptly exported this control signal that opens circuit greater than this surging threshold value;
One overcurrent protection unit, couple with this AC power and this power switch unit, in order to avoid this AC power to produce overcurrent, wherein, whether this overcurrent protection unit exports this control signal that opens circuit according to one of the current value of this AC power output and energy of this AC power output with decision; This overcurrent protection unit comprises the assembly that cuts off the power supply immediately, when this component inspection that cuts off the power supply immediately to the current value of this AC power greater than one immediately during threshold value, promptly export this control signal that opens circuit, this assembly that cuts off the power supply immediately comprises
One current inductor couples with this AC power, in order to export one first current value of this AC power;
One analog/digital converter receives this first current value and is converted to a digital signal; And
One comparator immediately couples with this analog/digital converter and this power switch unit, in order to this digital signal relatively and this threshold value immediately, if this digital signal greater than this immediately threshold value promptly export this control signal that opens circuit.
16. apparatus for protecting power supply according to claim 15 is characterized in that: this assembly that cuts off the power supply immediately comprises that a noise filtering unit is with this digital signal filtering noise.
17. apparatus for protecting power supply according to claim 15; it is characterized in that: this overcurrent protection unit comprises unusual assembly of a short time; the energy of exporting in a short time interval to this AC power when unusual component inspection of this short time is during greater than a unusual threshold value; promptly export this control signal that opens circuit, this short time, unusual assembly comprised
One current inductor couples with this AC power, in order to export one first current value of this AC power;
One analog/digital converter receives this first current value and is converted to a digital signal;
One integrator receives this digital signal, with after the digital signal square to a time interval integral, to export an energy signal;
One abnormal time calculator receives this energy signal, calculates a short time energy and output that a short time interval is accumulated; And
One unusual comparator is in order to relatively should a short time energy and a unusual threshold value, if this short time energy is promptly exported this control signal that opens circuit greater than this unusual threshold value.
18. apparatus for protecting power supply according to claim 15; it is characterized in that: this overcurrent protection unit comprises a long term overloading assembly; when this long term overloading component inspection to this AC power in one long-time at interval in the energy of output when transshipping threshold value greater than one; promptly export this control signal that opens circuit, this long term overloading assembly comprises
One current inductor couples with this AC power, in order to export one first current value of this AC power;
One analog/digital converter receives this first current value and is converted to a digital signal;
One integrator receives this digital signal, with after the digital signal square to a time interval integral, to export an energy signal;
One overload time calculator receives this energy signal, calculates a long-time long-time energy of being accumulated at interval and an output; And
One overload comparator transships threshold value in order to this long-time energy relatively and, promptly exports this control signal that opens circuit as if this long-time energy greater than this overload threshold value.
19. apparatus for protecting power supply according to claim 15 is characterized in that: this surging protected location also comprises the noise of a noise filter with this voltage signal of filtering.
CN 02119351 2002-05-13 2002-05-13 power protection device Expired - Lifetime CN1458723B (en)

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Application Number Priority Date Filing Date Title
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CN1458723B true CN1458723B (en) 2011-06-22

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US7342762B2 (en) * 2005-11-10 2008-03-11 Littelfuse, Inc. Resettable circuit protection apparatus
CN103715661A (en) * 2013-12-20 2014-04-09 柳州腾龙煤电科技股份有限公司 Power supply protection device used in geological exploration field
CN105587674B (en) * 2014-10-22 2018-07-06 中国石油化工股份有限公司 A kind of monitoring guard method of magnetic force pump power and device
CN104362583B (en) * 2014-11-14 2019-03-26 厦门大洋通信有限公司 Burst current detection switch
TWI622239B (en) * 2016-12-22 2018-04-21 國立高雄應用科技大學 Power switch
CN109066995A (en) * 2018-09-18 2018-12-21 星微科技（天津）有限公司 A kind of electric intelligent monitoring control mould group and monitoring and control method based on Internet of Things

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CN88200719U (en) * 1988-01-29 1988-11-23 过江 Electronic protector
CN2336499Y (en) * 1998-07-06 1999-09-01 赵孝尧 Safety protector for domestic electric appliances

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN88200719U (en) * 1988-01-29 1988-11-23 过江 Electronic protector
CN2336499Y (en) * 1998-07-06 1999-09-01 赵孝尧 Safety protector for domestic electric appliances

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