WO2019014946A1 - Electrothermal door lock protection circuit, control board, door lock, door lock protection accessory, and washing machine - Google Patents
Electrothermal door lock protection circuit, control board, door lock, door lock protection accessory, and washing machine Download PDFInfo
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- WO2019014946A1 WO2019014946A1 PCT/CN2017/093948 CN2017093948W WO2019014946A1 WO 2019014946 A1 WO2019014946 A1 WO 2019014946A1 CN 2017093948 W CN2017093948 W CN 2017093948W WO 2019014946 A1 WO2019014946 A1 WO 2019014946A1
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- Prior art keywords
- ptc
- door lock
- circuit
- protection
- washing machine
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Definitions
- the utility model belongs to the field of washing machines, and particularly relates to an electric heating type door lock protection circuit, a control board, a door lock, a door lock protection accessory and a washing machine.
- the electric door lock is an essential safety protection device for the washing machine. Its mechanical protection device can prevent the user from hitting the side door during the washing process, causing the water in the washing chamber to rush out, and also preventing accidental mechanical damage. In short, work The middle door is unbeatable. Its working principle is a PTC heating element in the door lock. After the power is applied, the bimetal structure is inflated, the mechanical structure is turned on, and the latch is locked at the same time.
- the door lock can be locked and unlocked.
- the door lock control circuit typically uses: a relay or a thyristor to connect the main PTC (ie, the PTC heating element) to the circuit.
- the door lock circuit may be broken down (the breakdown causes the instantaneous breakdown caused by the internal cause of the door lock itself and other unexplained breakdown), resulting in the thyristor/relay being Burnt, and even other components are burned out.
- this phenomenon is particularly noticeable due to the unstable grid voltage and the humid and rainy weather in the area, which not only increases the after-sales cost, but also greatly reduces the manufacturer's goodwill.
- the utility model provides an electric heating type door lock protection circuit, which aims to solve the problem that the door lock circuit is easily damaged by a large current impact.
- an electric heating type door lock protection circuit the protection circuit includes: [0008] a series connection of the switching device, an overcurrent protection PTC and a load connection end;
- the overcurrent protection PTC is a 2-pin, onboard PTC.
- the overcurrent protection PTC is a ceramic PTC.
- the utility model also provides a washing machine control board, wherein the control board has an electric heating type door lock protection circuit;
- the protection circuit is as described in any one of the above.
- the present invention also provides a washing machine, the washing machine comprising:
- the present invention also provides a washing machine electric door lock, the door lock includes:
- an overcurrent protection PTC the overcurrent protection PTC is a 2-pin onboard PTC;
- the overcurrent protection PTC-terminal is connected to the main PTC, and the other end is connected to the door lock terminal.
- the overcurrent protection PTC is a ceramic PTC.
- the present invention also provides a washing machine, the washing machine comprising:
- the utility model also provides a door lock protection accessory, wherein the door lock protection accessory comprises: [0024]
- the overcurrent protection PTC is a 2-pin PTC, and the two pins of the overcurrent protection PTC are respectively connected to two terminals of the door lock protection accessory.
- the overcurrent protection PTC is a ceramic PTC.
- a 2-pin overcurrent protection PTC is connected in series between the switching device and the load connection end, and the circuit is subjected to a large voltage shock, thereby causing a current in the circuit.
- a sharp increase in ⁇ , overcurrent protection PTC's resistance will increase sharply due to temperature rise, the current in the circuit will quickly decay to a small stable value, to avoid damage to the components in the circuit, the safety of the circuit Provides great assurance.
- FIG. 1 is a schematic diagram of a door lock circuit provided by the prior art
- FIG. 2 is a schematic diagram of another door lock circuit provided by the prior art
- FIG. 3 is a circuit diagram of an electrothermal door lock protection circuit provided by an embodiment of the present invention.
- FIG. 4 is a circuit diagram of an electrothermal door lock protection circuit according to another embodiment of the present invention.
- FIG. 5 is a front view of an overcurrent protection PTC provided by the present invention.
- FIG. 6 is a graph showing resistance temperature characteristics of an overcurrent protection PTC according to an embodiment of the present invention.
- a two-pin overcurrent protection PTC ie, a positive temperature coefficient thermistor
- the resistance of the overcurrent protection PTC will increase sharply, so that the current in the circuit is quickly attenuated to a small stable value, which ensures the safety of the circuit.
- the electrothermal door lock protection circuit includes:
- an overcurrent protection PTC is a 2-pin, on-board PTC to solder the overcurrent protection PTC to the circuit.
- the positive temperature coefficient characteristic of the overcurrent protection PTC ensures the safety of the circuit, and the circuit is subjected to high voltage breakdown, instantaneous breakdown caused by internal internal causes or other unexplained breakdown, in the circuit. The current suddenly increases, the temperature of the overcurrent protection PTC rises very high, and the resistance of the overcurrent protection PTC also increases sharply.
- the overcurrent protection PTC is an onboard PTC, as shown in FIG. 5, the maximum width D is 18.5 mm, the maximum height H is 25 mm, and the lead diameter d is 0.7 ⁇ 0.05. Mm, the distance F between the two pins' center axis is 5.0 soil 1.Omm, and the maximum thickness h of the overcurrent protection PTC is 5 mm.
- the resistance of the overcurrent protection PTC is small. If the circuit is subjected to a large voltage, the current flowing through the overcurrent protection PTC suddenly increases, and the overcurrent protection is performed. The temperature of the PTC rises rapidly, which in turn increases the resistance of the overcurrent protection PTC. That is, when the temperature of the overcurrent protection PTC rises rapidly from Tc to Tp ⁇ , the resistance rapidly increases from Rc to Rp. The current in the circuit is quickly attenuated to a small stable value, which avoids damage to the components in the circuit and provides great guarantee for the safety of the circuit.
- a relay having a small influence of a surge current and a good on-off characteristic is used as a switching device, and one end of the PTC is protected by an overcurrent (one of the pins).
- the other end of the overcurrent protection PTC (the other pin) is connected to the load (ie the main PTC in the figure), that is, the pin is connected to the load, the load
- the other end and the other end of the set of common contacts are respectively connected to the live and neutral lines of the mains, and the relay coil is electrically connected to the PTC access circuit. It can be understood that the positional relationship between the components can be changed as long as the load overcurrent protection PTC and the switching device are connected in series.
- a thyristor having a small volume, a fast switching speed, and a low price is used as a switching device, such as a bidirectional thyristor, etc. Circuit Connections The present invention is not described here.
- the overcurrent protection PTC is a PTC ⁇ made of an organic polymer material, although it can also function as a protection circuit for a large current impact, the service life is not long, after passing through After 40 to 60 impact tests, the overcurrent protection PTC is damaged and does not work properly. So in order to improve In the present embodiment, the overcurrent protection PTC uses a ceramic PTC, which is based on barium titanate, and is miscellaneous with other such as 8, Si, Li, P, Cs, Nd, Al, Ti, etc.
- the ceramic P TC is mainly composed of materials such as BaTi03, B203, SiO2, Li20, P205, Cs20, Nd203, A1203, Ti02, etc.
- the resistance of the over-current protection PTC is small, Only a dozen or so ohms, working ⁇ , can withstand voltage surges exceeding 500V, and high current surges exceeding 40A, when the temperature is above the Curie temperature ⁇ (Curie temperature is 143 ° C ⁇ 157 ° C), resistance step Increased by more than 10,000 times, it is especially suitable for protecting the heating type door lock circuit to prevent damage to the door lock circuit caused by large current surge caused by short circuit and the like.
- the protection circuit using the above ceramic PTC provided by the present invention can well protect components such as loads in the circuit.
- the circuit is subjected to short-circuit impact test at room temperature using the mains (power supply voltage 220V). After 30 seconds of power-off, the power is turned off.
- the over-current protection PTC can return to the initial value within 60 seconds. The circuit can be put into use again. Therefore, when the protection type circuit provided by the embodiment is used in the door lock of the heating type washing machine, not only the safety of each device in the door lock can be protected in the short circuit, but also can be quickly put into use after the power failure maintenance.
- the present invention also provides a washing machine control panel having an electric heating type door lock protection circuit; the protection circuit is as described above.
- the control board includes a PCB board or the like.
- the PCB board is provided with a protection circuit as described in the above embodiment, and the main PTC of the electrothermal door lock is serially connected to the protection circuit through the wire, when the circuit suddenly increases.
- the temperature of the overcurrent protection PTC increases, and the resistance of the overcurrent protection PTC increases by more than 10,000 times, so that the current in the circuit is quickly attenuated to a small stable value, thereby effectively preventing the electrothermal door lock.
- the components and the control board inside are burned out.
- the present invention also provides a washing machine, the washing machine comprising:
- a washing machine body and a control panel disposed in the washing machine body, the control panel being as described in the above embodiment.
- the washing machine uses the above-mentioned control board, which effectively avoids the phenomenon that the control board is easily burned in the event of a large current impact, which makes the whole washing machine more safe and reliable, and greatly reduces the after-sales maintenance frequency of the whole machine factory. Degree and maintenance costs have improved the goodwill of the whole plant.
- the utility model also provides an electric heating door lock of a washing machine, the door lock comprising: [0048] Overcurrent protection PTC; overcurrent protection PTC-side is connected to the main PTC (PTC ceramic electric heating element), and the other end is connected to the door lock terminal; the overcurrent protection PTC is a 2-pin on-board PTC, so that The flow protection PTC is soldered to the board.
- One end of the overcurrent protection PTC (one of the pins) is connected to the main PTC
- the other end of the overcurrent protection PTC (the other pin) is connected to the door lock terminal, that is, the overcurrent protection PTC is connected in series with the main PTC.
- the door lock terminal can be directly connected to the neutral line of the mains, and the other end of the main PTC can be directly connected to the live line of the mains. Since the door lock of the washing machine is a heated door lock, the main PTC for heating during use is in a working state, and the use of the long raft will cause the plastic around the main PTC to be carbonized, and the wet working environment of the washing machine is highly likely to cause Short circuit, in this embodiment, the door lock uses a protection circuit including an overcurrent protection PTC. When a short circuit occurs, the temperature of the overcurrent protection PTC rises rapidly, and the resistance value thereof also increases stepwise. The current in the circuit effectively protects the safety of the door lock.
- the resistance of the overcurrent protection PTC is small, and if the circuit is subjected to a large voltage, the current flowing through the overcurrent protection PTC suddenly increases, and the overcurrent protection is performed.
- the temperature of the PTC rises rapidly, which in turn increases the resistance of the overcurrent protection PTC. That is, when the temperature of the overcurrent protection PTC rises rapidly from Tc to Tp ⁇ , the resistance rapidly increases from Rc to Rp.
- the current in the circuit is quickly attenuated to a small stable value, avoiding damage to components in the circuit, making the entire door lock more secure and reliable.
- the overcurrent protection PTC adopts a ceramic PTC to improve the protection effect of the overcurrent PTC and further improve the safety performance of the door lock.
- the size and material composition of the overcurrent protection PTC are as described in the above embodiments.
- the present invention also provides a washing machine, the washing machine comprising:
- a washing machine body and a door lock mounted on the body of the washing machine, the door lock being as described in the above embodiment.
- the embodiment provides a washing machine, which uses the door lock described in the above embodiment, so that the whole washing machine is more safe and reliable, greatly reduces the frequency of maintenance and repair of the whole machine factory, and improves the goodwill of the manufacturer.
- the utility model also provides a door lock protection accessory, the door lock protection accessory comprises: an overcurrent protection PTC, the two ends of the overcurrent protection PTC are respectively connected with two terminals of the door lock protection accessory;
- the PTC is a 2-pin PTC.
- the door lock protection accessory comprises at least two external terminals, so that the internal overcurrent protection PTC can be serially connected in the main circuit where the door lock is located, that is, the overcurrent protection PTC is connected in series with the main PTC to protect the door lock.
- the overcurrent protection PTC also uses a ceramic PTC to improve the protection effect of the overcurrent PTC. Further in the present embodiment, the material composition of the overcurrent protection PTC is as described in the above embodiment.
- a 2-pin overcurrent protection PTC is connected in series between the switching device and the load connection end, and the circuit is subjected to a large voltage impact, resulting in a circuit.
- the current in the circuit increases sharply.
- the resistance of the overcurrent protection PTC will increase sharply due to the temperature rise, which will quickly attenuate the current in the circuit to a small stable value, avoiding damage to components in the circuit.
- the safety of the circuit provides great assurance.
- This circuit uses only one over-current protection PTC, cleverly applies its characteristics, achieves low-cost, high-reliability protection of the door lock of the washing machine, greatly reduces the frequency of maintenance and repair of the whole machine factory, and improves the overall cost. Goodwill of the machine factory.
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Abstract
Provided are an electrothermal door lock protection circuit, a control board, a door lock, a door lock protection accessory, and a washing machine. The door lock protection circuit comprises: a switch device, an over-current protection PTC and a load connection end which are connected in series, wherein the over-current protection PTC is a 2-pin PTC that can be onboard. By connecting the 2-pin over-current protection PTC in series between a switch device and a load connection end, when a circuit is subjected to high voltage breakdown, transient breakdown caused by internal reasons of itself and the other unknown types of breakdown, leading to a sharp increase in the current in the circuit, the resistance of the over-current protection PTC will sharply increase due to temperature increase, such that the current in the circuit is rapidly attenuated to a very small stable value, thereby avoiding damage to components in the circuit, and providing a great guarantee of the safety of the circuit.
Description
电热式门锁保护电路、 控制板、 门锁、 门锁保护附件及 洗衣机 Electric door lock protection circuit, control board, door lock, door lock protection accessory and washing machine
技术领域 Technical field
[0001] 本实用新型属于洗衣机领域, 尤其涉及一种电热式门锁保护电路、 控制板、 门 锁、 门锁保护附件以及洗衣机。 [0001] The utility model belongs to the field of washing machines, and particularly relates to an electric heating type door lock protection circuit, a control board, a door lock, a door lock protection accessory and a washing machine.
背景技术 Background technique
[0002] 电热式门锁是洗衣机必备的安全保护器件, 它的机械保护装置可以防止洗涤过 程中用户打幵侧门, 造成洗涤腔中的水涌出, 也可以防止意外机械伤害, 总之 , 工作中门是打不幵的。 它的工作原理是门锁中一个 PTC加热元件, 通电发热以 后, 引发双金属片结构膨胀, 带动机械结构接通电源, 同吋卡住门幵关的栓锁 [0002] The electric door lock is an essential safety protection device for the washing machine. Its mechanical protection device can prevent the user from hitting the side door during the washing process, causing the water in the washing chamber to rush out, and also preventing accidental mechanical damage. In short, work The middle door is unbeatable. Its working principle is a PTC heating element in the door lock. After the power is applied, the bimetal structure is inflated, the mechanical structure is turned on, and the latch is locked at the same time.
, 防止意外打幵。 控制 PTC的通断电, 就可以实现门锁的闭锁与解锁。 , to prevent accidental snoring. By controlling the PTC's power on and off, the door lock can be locked and unlocked.
[0003] 现有技术中, 如图 1和图 2所示, 门锁控制电路通常使用: 继电器或者可控硅来 将主 PTC (即, PTC加热元件) 接入电路。 然而, 在实际使用过程中, 门锁电路 有吋会被击穿 (击穿原因有门锁自身内部原因造成的瞬吋击穿和其他不明原因 的击穿) , 从而导致可控硅 /继电器被烧毁, 甚至其他元器件也被烧坏的现象。 尤其是在印度, 由于电网电压不稳定, 再加上该地区潮湿多雨, 所以这种现象 尤为明显, 不仅增大了售后成本, 还使厂商的商誉受到极大损失。 [0003] In the prior art, as shown in FIGS. 1 and 2, the door lock control circuit typically uses: a relay or a thyristor to connect the main PTC (ie, the PTC heating element) to the circuit. However, in actual use, the door lock circuit may be broken down (the breakdown causes the instantaneous breakdown caused by the internal cause of the door lock itself and other unexplained breakdown), resulting in the thyristor/relay being Burnt, and even other components are burned out. Especially in India, this phenomenon is particularly noticeable due to the unstable grid voltage and the humid and rainy weather in the area, which not only increases the after-sales cost, but also greatly reduces the manufacturer's goodwill.
[0004] 经过实地考察, 以及反复的实验观察, 发现产生这种现象的原因是: 洗衣机的 工作环境比较潮湿, 而门锁存在机械动作装置, 无法做到密封防潮、 防水, 而 门锁工作原理就是 PTC加热双金属片, 带动机械运动, 当 PTC冷热交替吋, 空气 中水分的冷凝, 会在门锁内部造成金属锈蚀, 锈蚀的金属碎片剥落会造成随机 短路; 此外对于一些使用吋间长的洗衣机, PTC周围的塑料会因为长吋间加热的 原因导致碳化, 潮湿环境吋, 在电网电压的作用下容易出现瞬吋击穿短路, 烧 毁继电器或者可控硅、 甚至直接烧坏电路板。 [0004] After field investigations and repeated experimental observations, the reason for this phenomenon is found to be: The working environment of the washing machine is relatively humid, and the door is latched in the mechanical action device, which cannot be sealed against moisture and water, and the door lock works. It is the PTC heating bimetal that drives the mechanical movement. When the PTC is hot and cold alternately, the condensation of moisture in the air will cause metal corrosion inside the door lock, and the rusted metal fragments will cause random short circuit; The washing machine, the plastic around the PTC will be carbonized due to the heating between the long turns, the humid environment is paralyzed, the short circuit breakdown short circuit is easily caused by the voltage of the grid, the relay or the thyristor is burnt, and even the circuit board is directly burned.
[0005] 现有技术中, 为了防止线路被烧坏, 一些洗衣机电控板生产厂家通过加宽 PCB 印制线、 在印制线上堆锡等方法来提高线路的过电流能力, 防止其所生产的配
件被烧坏, 然而其他配件或许只是达到生产标准, 并不具备耐高温大电流的特 性, 所以出现上述短路现象吋, 这些不能耐高温大电流的配件可能被烧坏, 不 能从根本上解决上述问题。 因此需要找到简单, 便捷, 低成本的方法, 解决加 热式门锁瞬吋短路的问题, 以保证洗衣机的性能, 避免给用户带来安全隐患, 避免厂商的售后成本的增加。 [0005] In the prior art, in order to prevent the line from being burned out, some washing machine electronic control board manufacturers increase the overcurrent capability of the line by widening the PCB printing line and stacking tin on the printed line to prevent the line from being damaged. Production match The parts are burned out, but other accessories may only meet the production standards, and do not have the characteristics of high temperature and high current resistance. Therefore, the above short circuit phenomenon occurs. These parts that cannot withstand high temperature and high current may be burned out, and the above cannot be fundamentally solved. problem. Therefore, it is necessary to find a simple, convenient, low-cost method to solve the problem of instantaneous short-circuit of the heated door lock, to ensure the performance of the washing machine, to avoid potential safety hazards to the user, and to avoid the increase in the after-sale cost of the manufacturer.
技术问题 technical problem
[0006] 本实用新型提供一种电热式门锁保护电路, 旨在解决门锁电路在大电流冲击吋 易损坏的问题。 The utility model provides an electric heating type door lock protection circuit, which aims to solve the problem that the door lock circuit is easily damaged by a large current impact.
问题的解决方案 Problem solution
技术解决方案 Technical solution
[0007] 本实用新型是这样实现的, 一种电热式门锁保护电路, 所述保护电路包括: [0008] 串型连接的幵关器件、 过流保护 PTC以及负载连接端; [0007] The present invention is implemented in this way, an electric heating type door lock protection circuit, the protection circuit includes: [0008] a series connection of the switching device, an overcurrent protection PTC and a load connection end;
[0009] 所述过流保护 PTC为 2脚的可板载的 PTC。 [0009] The overcurrent protection PTC is a 2-pin, onboard PTC.
[0010] 优选的, 所述过流保护 PTC为陶瓷 PTC。 [0010] Preferably, the overcurrent protection PTC is a ceramic PTC.
[0011] 本实用新型还提供了一种洗衣机控制板, 所述控制板上具有一个电热式门锁保 护电路; [0011] The utility model also provides a washing machine control board, wherein the control board has an electric heating type door lock protection circuit;
[0012] 所述保护电路如上任意一项所述。 [0012] The protection circuit is as described in any one of the above.
[0013] 本实用新型还提供了一种洗衣机, 所述洗衣机包括: [0013] The present invention also provides a washing machine, the washing machine comprising:
[0014] 洗衣机本体; 以及 [0014] a washing machine body;
[0015] 设于所述洗衣机本体内的控制板, 所述控制板如上所述。 [0015] A control panel disposed in the body of the washing machine, the control panel being as described above.
[0016] 本实用新型还提供了一种洗衣机电热式门锁, 所述门锁包括: [0016] The present invention also provides a washing machine electric door lock, the door lock includes:
[0017] 过流保护 PTC, 所述过流保护 PTC为 2脚的可板载的 PTC; [0017] an overcurrent protection PTC, the overcurrent protection PTC is a 2-pin onboard PTC;
[0018] 所述过流保护 PTC—端与主 PTC相连, 另一端与门锁端子相连。 [0018] The overcurrent protection PTC-terminal is connected to the main PTC, and the other end is connected to the door lock terminal.
[0019] 优选的, 所述过流保护 PTC为陶瓷 PTC。 [0019] Preferably, the overcurrent protection PTC is a ceramic PTC.
[0020] 本实用新型还提供了一种洗衣机, 所述洗衣机包括: [0020] The present invention also provides a washing machine, the washing machine comprising:
[0021] 洗衣机本体; 以及 [0021] a washing machine body;
[0022] 安装于所述洗衣机本体上的门锁, 所述门锁如上任意一项所述。 [0022] A door lock mounted on the body of the washing machine, the door lock being as described in any one of the above.
[0023] 本实用新型还提供了一种门锁保护附件, 所述门锁保护附件包括:
[0024] 过流保护 PTC, 所述过流保护 PTC为 2脚 PTC, 所述过流保护 PTC的两引脚分别 与所述门锁保护附件的两个端子相连。 [0023] The utility model also provides a door lock protection accessory, wherein the door lock protection accessory comprises: [0024] The overcurrent protection PTC is a 2-pin PTC, and the two pins of the overcurrent protection PTC are respectively connected to two terminals of the door lock protection accessory.
[0025] 优选的, 所述过流保护 PTC为陶瓷 PTC。 [0025] Preferably, the overcurrent protection PTC is a ceramic PTC.
发明的有益效果 Advantageous effects of the invention
有益效果 Beneficial effect
[0026] 在本实用新型提供的电热式门锁保护电路中, 在幵关器件和负载连接端之间串 联了 2脚的过流保护 PTC, 电路在受到大电压冲击, 而导致电路中的电流急剧增 大吋, 过流保护 PTC的电阻会因为温度上升而急剧增大, 会使电路中的电流很快 衰减到很小的稳定值, 避免了电路中的元器件的损坏, 对电路的安全提供了极 大的保证。 [0026] In the electrothermal door lock protection circuit provided by the present invention, a 2-pin overcurrent protection PTC is connected in series between the switching device and the load connection end, and the circuit is subjected to a large voltage shock, thereby causing a current in the circuit. A sharp increase in 吋, overcurrent protection PTC's resistance will increase sharply due to temperature rise, the current in the circuit will quickly decay to a small stable value, to avoid damage to the components in the circuit, the safety of the circuit Provides great assurance.
对附图的简要说明 Brief description of the drawing
附图说明 DRAWINGS
[0027] 图 1是现有技术提供的一种门锁电路的示意图; 1 is a schematic diagram of a door lock circuit provided by the prior art;
[0028] 图 2是现有技术提供的另一种门锁电路的示意图; 2 is a schematic diagram of another door lock circuit provided by the prior art;
[0029] 图 3是本实用新型实施例提供的电热式门锁保护电路的电路图; 3 is a circuit diagram of an electrothermal door lock protection circuit provided by an embodiment of the present invention;
[0030] 图 4是本实用新型另一实施例提供的电热式门锁保护电路的电路图; 4 is a circuit diagram of an electrothermal door lock protection circuit according to another embodiment of the present invention;
[0031] 图 5是本实用新型提供的过流保护 PTC的主视图; 5 is a front view of an overcurrent protection PTC provided by the present invention;
[0032] 图 6是本实用新型实施例提供的过流保护 PTC的电阻温度特性曲线图。 6 is a graph showing resistance temperature characteristics of an overcurrent protection PTC according to an embodiment of the present invention.
本发明的实施方式 Embodiments of the invention
[0033] 为了使本实用新型的目的、 技术方案及优点更加清楚明白, 以下结合附图及实 施例, 对本实用新型进行进一步详细说明。 应当理解, 此处所描述的具体实施 例仅仅用以解释本实用新型, 并不用于限定本实用新型。 [0033] In order to make the objects, technical solutions, and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0034] 本实用新型提供的电热式门锁保护电路中, 在幵关器件和负载连接端之间串联 了两脚的过流保护 PTC (即正温度系数热敏电阻) , 当电路中的电流增大吋, 过 流保护 PTC的阻值会急剧增大, 使电路中的电流很快衰减到很小的稳定值, 保证 了电路的安全。
[0035] 以下结合具体实施例对本实用新型的具体实现做详细描述。 [0034] In the electrothermal door lock protection circuit provided by the utility model, a two-pin overcurrent protection PTC (ie, a positive temperature coefficient thermistor) is connected in series between the switching device and the load connection end, when the current in the circuit When the 吋 is increased, the resistance of the overcurrent protection PTC will increase sharply, so that the current in the circuit is quickly attenuated to a small stable value, which ensures the safety of the circuit. [0035] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.
[0036] 在本实用新型提供的实施例中, 该电热式门锁保护电路包括: [0036] In the embodiment provided by the present invention, the electrothermal door lock protection circuit includes:
[0037] 串型连接的幵关器件、 过流保护 PTC以及负载连接端; 过流保护 PTC为 2脚的可 板载的 PTC, 以便将过流保护 PTC焊接在电路上。 在本实施例中, 利用过流保护 PTC的正温度系数特性保证了电路的安全, 电路在受到高电压击穿、 自身内部原 因造成的瞬吋击穿或者其他不明原因的击穿吋, 电路中的电流突然增大, 过流 保护 PTC的温度会上升很高, 进而过流保护 PTC的阻值也会急剧增大。 [0037] A series-connected shut-off device, an overcurrent protection PTC, and a load connection; an overcurrent protection PTC is a 2-pin, on-board PTC to solder the overcurrent protection PTC to the circuit. In this embodiment, the positive temperature coefficient characteristic of the overcurrent protection PTC ensures the safety of the circuit, and the circuit is subjected to high voltage breakdown, instantaneous breakdown caused by internal internal causes or other unexplained breakdown, in the circuit. The current suddenly increases, the temperature of the overcurrent protection PTC rises very high, and the resistance of the overcurrent protection PTC also increases sharply.
[0038] 在本实施例中, 过流保护 PTC为可板载的 PTC, 如图 5所示, 其的最大宽度 D为 18.5mm, 最大高度 H为 25 mm, 引脚直径 d为 0.7±0.05mm, 两引脚中轴线间的距 离 F为 5.0土 1.Omm, 另外过流保护 PTC的最大厚度 h为 5mm。 [0038] In this embodiment, the overcurrent protection PTC is an onboard PTC, as shown in FIG. 5, the maximum width D is 18.5 mm, the maximum height H is 25 mm, and the lead diameter d is 0.7±0.05. Mm, the distance F between the two pins' center axis is 5.0 soil 1.Omm, and the maximum thickness h of the overcurrent protection PTC is 5 mm.
[0039] 如图 6所示, 电路正常工作吋, 过流保护 PTC的阻值很小, 此吋若电路受到大 电压冲击吋, 流过过流保护 PTC的电流突然增大, 使过流保护 PTC的温度快速升 高, 进而使过流保护 PTC的阻值急剧增大, 即, 当过流保护 PTC的温度从 Tc快速 上升到 Tp吋, 其阻值迅速从 Rc增大至 Rp, 会使电路中的电流很快衰减到很小的 稳定值, 避免了电路中的元器件的损坏, 对电路的安全提供了极大的保证。 [0039] As shown in FIG. 6, after the circuit works normally, the resistance of the overcurrent protection PTC is small. If the circuit is subjected to a large voltage, the current flowing through the overcurrent protection PTC suddenly increases, and the overcurrent protection is performed. The temperature of the PTC rises rapidly, which in turn increases the resistance of the overcurrent protection PTC. That is, when the temperature of the overcurrent protection PTC rises rapidly from Tc to Tp吋, the resistance rapidly increases from Rc to Rp. The current in the circuit is quickly attenuated to a small stable value, which avoids damage to the components in the circuit and provides great guarantee for the safety of the circuit.
[0040] 如图 3所示, 在本实施例中, 采用受浪涌电流影响小, 通断特性好等优点的继 电器作为幵关器件, 此吋过流保护 PTC的一端 (其中一个引脚) 与继电器一组常 幵触点的一端相接, 过流保护 PTC的另一端 (另一个引脚) 接负载 (即图中的主 PTC) 连接端, 即该引脚与负载相接, 负载的另一端与所述一组常幵触点的另一 端分别与市电的火线和零线相接, 当继电器线圈得电吋过流保护 PTC接入电路。 可以理解的, 各元器件间的位置关系可以进行变动, 只要是负载过流保护 PTC以 及幵关器件三者之间是串联即可。 [0040] As shown in FIG. 3, in the present embodiment, a relay having a small influence of a surge current and a good on-off characteristic is used as a switching device, and one end of the PTC is protected by an overcurrent (one of the pins). Connected to one end of a set of common contacts of the relay, the other end of the overcurrent protection PTC (the other pin) is connected to the load (ie the main PTC in the figure), that is, the pin is connected to the load, the load The other end and the other end of the set of common contacts are respectively connected to the live and neutral lines of the mains, and the relay coil is electrically connected to the PTC access circuit. It can be understood that the positional relationship between the components can be changed as long as the load overcurrent protection PTC and the switching device are connected in series.
[0041] 如图 4所示, 在本实用新型提供的另一实施例中, 采用具有体积小, 幵关速度 快、 价格低廉等优点的可控硅作为幵关器件, 如双向晶闸管等, 具体电路连接 本实用新型在此不做过多说明。 [0041] As shown in FIG. 4, in another embodiment provided by the present invention, a thyristor having a small volume, a fast switching speed, and a low price is used as a switching device, such as a bidirectional thyristor, etc. Circuit Connections The present invention is not described here.
[0042] 另外, 在实际测试过程中, 当过流保护 PTC为有机高分子材料制成的 PTC吋, 虽然也能起到在大电流冲击吋保护电路的作用, 但是使用寿命不长, 在经过 40 〜60次的冲击测试后, 该过流保护 PTC便损坏, 不能正常工作。 所以为了提高过
流保护 PTC的效果, 在本实施例中, 过流保护 PTC采用陶瓷 PTC, 其以钛酸钡为 基, 并惨杂有其它如8、 Si、 Li、 P、 Cs、 Nd、 Al、 Ti等元素, 具体的, 该陶瓷 P TC主要由 BaTi03、 B203、 Si02、 Li20、 P205、 Cs20、 Nd203、 A1203、 Ti02 等材料组成, 在本实施例中, 常温吋, 过流保护 PTC的电阻很小, 只有十几欧, 工作吋, 可承受超过 500V的电压冲击, 以及超过 40A的大电流冲击, 当温度在居 里温度以上吋 (居里温度在 143°C〜157°C) , 电阻阶跃性增加万倍以上, 特别适 合对加热式门锁电路进行保护, 防止短路等原因导致的大电流冲击对门锁电路 带来损坏。 [0042] In addition, in the actual test process, when the overcurrent protection PTC is a PTC吋 made of an organic polymer material, although it can also function as a protection circuit for a large current impact, the service life is not long, after passing through After 40 to 60 impact tests, the overcurrent protection PTC is damaged and does not work properly. So in order to improve In the present embodiment, the overcurrent protection PTC uses a ceramic PTC, which is based on barium titanate, and is miscellaneous with other such as 8, Si, Li, P, Cs, Nd, Al, Ti, etc. Specifically, the ceramic P TC is mainly composed of materials such as BaTi03, B203, SiO2, Li20, P205, Cs20, Nd203, A1203, Ti02, etc. In this embodiment, the resistance of the over-current protection PTC is small, Only a dozen or so ohms, working 吋, can withstand voltage surges exceeding 500V, and high current surges exceeding 40A, when the temperature is above the Curie temperature 居 (Curie temperature is 143 ° C ~ 157 ° C), resistance step Increased by more than 10,000 times, it is especially suitable for protecting the heating type door lock circuit to prevent damage to the door lock circuit caused by large current surge caused by short circuit and the like.
[0043] 在对本实用新型提供的使用了上述陶瓷 PTC的保护电路进行检验过程中, 进行 了超过万次的瞬吋短路大电流冲击实验后, 电路中的负载以及其他元器件均能 正常工作, 所以通过本实用新型提供的保护电路可以很好的对电路中的负载等 元器件进行保护。 此外在测试过程中, 电路在室温条件下, 使用市电 (电源电 压 220V) 进行短路冲击测试, 通电吋间 30秒后断电, 过流保护 PTC在 60秒内便 可回复到初始值, 整个电路便可再次投入使用。 所以当加热式洗衣机门锁使用 了本实施例提供的保护电路后, 不仅可以在短路吋保护门锁内各器件的安全, 还能在断电检修后迅速投入使用。 [0043] In the inspection process of the protection circuit using the above ceramic PTC provided by the present invention, after more than 10,000 times of instantaneous short circuit and large current impact test, the load and other components in the circuit can work normally. Therefore, the protection circuit provided by the utility model can well protect components such as loads in the circuit. In addition, during the test, the circuit is subjected to short-circuit impact test at room temperature using the mains (power supply voltage 220V). After 30 seconds of power-off, the power is turned off. The over-current protection PTC can return to the initial value within 60 seconds. The circuit can be put into use again. Therefore, when the protection type circuit provided by the embodiment is used in the door lock of the heating type washing machine, not only the safety of each device in the door lock can be protected in the short circuit, but also can be quickly put into use after the power failure maintenance.
[0044] 本实用新型还提供了一种洗衣机控制板, 该控制板上具有一个电热式门锁的保 护电路; 该保护电路如上所述。 在本实施例中, 控制板包括 PCB板等, PCB板上 设置有如上述实施例所述的保护电路, 并通过导线将电热式门锁的主 PTC串接于 保护电路中, 当电路突然增大, 过流保护 PTC的温度随之增大, 过流保护 PTC的 阻值阶跃性增大万倍以上, 使电路中的电流很快衰减到很小的稳定值, 从而有 效防止电热式门锁内的元器件以及控制板被烧坏。 [0044] The present invention also provides a washing machine control panel having an electric heating type door lock protection circuit; the protection circuit is as described above. In this embodiment, the control board includes a PCB board or the like. The PCB board is provided with a protection circuit as described in the above embodiment, and the main PTC of the electrothermal door lock is serially connected to the protection circuit through the wire, when the circuit suddenly increases. The temperature of the overcurrent protection PTC increases, and the resistance of the overcurrent protection PTC increases by more than 10,000 times, so that the current in the circuit is quickly attenuated to a small stable value, thereby effectively preventing the electrothermal door lock. The components and the control board inside are burned out.
[0045] 本实用新型还提供了一种洗衣机, 该洗衣机包括: [0045] The present invention also provides a washing machine, the washing machine comprising:
[0046] 洗衣机本体; 以及设于洗衣机本体内的控制板, 该控制板如上述实施例所述。 [0046] a washing machine body; and a control panel disposed in the washing machine body, the control panel being as described in the above embodiment.
在本实施例中, 洗衣机使用了上述的控制板, 有效地避免了控制板在遇到大电 流冲击吋易被烧坏的现象, 使得整个洗衣机更加安全可靠, 大大降低了整机厂 售后维修频度与维修成本, 提高了整机厂的商誉。 In the embodiment, the washing machine uses the above-mentioned control board, which effectively avoids the phenomenon that the control board is easily burned in the event of a large current impact, which makes the whole washing machine more safe and reliable, and greatly reduces the after-sales maintenance frequency of the whole machine factory. Degree and maintenance costs have improved the goodwill of the whole plant.
[0047] 本实用新型还提供了一种洗衣机电热式门锁, 该门锁包括:
[0048] 过流保护 PTC; 过流保护 PTC—端与主 PTC (PTC陶瓷电热元件) 相连, 另一 端与门锁端子相连; 过流保护 PTC为 2脚的可板载的 PTC, 以便该过流保护 PTC 焊接于电路板上。 过流保护 PTC的一端 (其中一个引脚) 与主 PTC相接, 过流保 护 PTC的另一端 (另一个引脚) 与门锁端子相连, 即过流保护 PTC与主 PTC之间 串联。 门锁端子可以直接与市电的零线相接, 主 PTC的另一端可以直接与市电的 火线相接。 由于洗衣机门锁为加热式门锁, 使用过程中用于发热的主 PTC—直处 于工作状态, 长吋间使用会导致主 PTC周围的塑料会碳化, 加上洗衣机潮湿的工 作环境, 极易引起短路, 在本实施例中, 门锁使用了包含有过流保护 PTC的保护 电路, 当出现短路吋, 过流保护 PTC的温度迅速升高, 其阻值也会发生阶跃性增 大, 限制了电路中的电流, 有效地保护了门锁的安全。 [0047] The utility model also provides an electric heating door lock of a washing machine, the door lock comprising: [0048] Overcurrent protection PTC; overcurrent protection PTC-side is connected to the main PTC (PTC ceramic electric heating element), and the other end is connected to the door lock terminal; the overcurrent protection PTC is a 2-pin on-board PTC, so that The flow protection PTC is soldered to the board. One end of the overcurrent protection PTC (one of the pins) is connected to the main PTC , and the other end of the overcurrent protection PTC (the other pin) is connected to the door lock terminal, that is, the overcurrent protection PTC is connected in series with the main PTC. The door lock terminal can be directly connected to the neutral line of the mains, and the other end of the main PTC can be directly connected to the live line of the mains. Since the door lock of the washing machine is a heated door lock, the main PTC for heating during use is in a working state, and the use of the long raft will cause the plastic around the main PTC to be carbonized, and the wet working environment of the washing machine is highly likely to cause Short circuit, in this embodiment, the door lock uses a protection circuit including an overcurrent protection PTC. When a short circuit occurs, the temperature of the overcurrent protection PTC rises rapidly, and the resistance value thereof also increases stepwise. The current in the circuit effectively protects the safety of the door lock.
[0049] 如图 6所示, 电路正常工作吋, 过流保护 PTC的阻值很小, 此吋若电路受到大 电压冲击吋, 流过过流保护 PTC的电流突然增大, 使过流保护 PTC的温度快速升 高, 进而使过流保护 PTC的阻值急剧增大, 即, 当过流保护 PTC的温度从 Tc快速 上升到 Tp吋, 其阻值迅速从 Rc增大至 Rp, 会使电路中的电流很快衰减到很小的 稳定值, 避免了电路中的元器件的损坏, 使整个门锁更加安全可靠。 [0049] As shown in FIG. 6, after the circuit works normally, the resistance of the overcurrent protection PTC is small, and if the circuit is subjected to a large voltage, the current flowing through the overcurrent protection PTC suddenly increases, and the overcurrent protection is performed. The temperature of the PTC rises rapidly, which in turn increases the resistance of the overcurrent protection PTC. That is, when the temperature of the overcurrent protection PTC rises rapidly from Tc to Tp吋, the resistance rapidly increases from Rc to Rp. The current in the circuit is quickly attenuated to a small stable value, avoiding damage to components in the circuit, making the entire door lock more secure and reliable.
[0050] 此外, 在本实施例中, 过流保护 PTC采用陶瓷 PTC, 以提高过流 PTC的保护效 果, 进一步提高门锁的安全性能。 另外在本实施例中, 过流保护 PTC的尺寸大小 以及材料组成, 都如上述实施例所述。 In addition, in the embodiment, the overcurrent protection PTC adopts a ceramic PTC to improve the protection effect of the overcurrent PTC and further improve the safety performance of the door lock. Further, in the present embodiment, the size and material composition of the overcurrent protection PTC are as described in the above embodiments.
[0051] 本实用新型还提供了一种洗衣机, 该洗衣机包括: [0051] The present invention also provides a washing machine, the washing machine comprising:
[0052] 洗衣机本体; 以及安装于洗衣机本体上的门锁, 该门锁如上述实施例所述。 本 实施例提供洗衣机, 使用了上述实施例所述的门锁, 使得整个洗衣机更加安全 可靠, 大大降低了整机厂售后维修频度与维修成本, 提高了厂商的商誉。 [0052] a washing machine body; and a door lock mounted on the body of the washing machine, the door lock being as described in the above embodiment. The embodiment provides a washing machine, which uses the door lock described in the above embodiment, so that the whole washing machine is more safe and reliable, greatly reduces the frequency of maintenance and repair of the whole machine factory, and improves the goodwill of the manufacturer.
[0053] 实用新型还提供了一种门锁保护附件, 该门锁保护附件包括: 过流保护 PTC, 该过流保护 PTC的两端分别与门锁保护附件的两个端子相连; 过流保护 PTC为 2 脚 PTC。 该门锁保护附件至少包括两个外接端子, 以便其内部的过流保护 PTC可 串接于门锁所在的主电路中, 即, 使过流保护 PTC与主 PTC串联, 以对门锁提供 保护, 通过该门锁保护附件, 对于已经生产的洗衣机, 返厂重做不太现实, 通 过本实施例提供的门锁保护附件可完美解决这一问题: 不仅能对于已经生产的
洗衣机进行过流保护, 而且成本低廉, 不需要对现有洗衣机做太大改动便可使 洗衣机变得更加安全。 在本实施例中, 过流保护 PTC也采用陶瓷 PTC, 来提高过 流 PTC的保护效果。 另外在本实施例中, 过流保护 PTC的材料组成, 如上述实施 例所述。 [0053] The utility model also provides a door lock protection accessory, the door lock protection accessory comprises: an overcurrent protection PTC, the two ends of the overcurrent protection PTC are respectively connected with two terminals of the door lock protection accessory; The PTC is a 2-pin PTC. The door lock protection accessory comprises at least two external terminals, so that the internal overcurrent protection PTC can be serially connected in the main circuit where the door lock is located, that is, the overcurrent protection PTC is connected in series with the main PTC to protect the door lock. By the door lock protection accessory, it is not realistic to return to the factory for the washing machine that has already been produced, and the door lock protection accessory provided by the embodiment can perfectly solve the problem: not only for the already produced The washing machine is over-current protected, and the cost is low. It is not necessary to make too many changes to the existing washing machine to make the washing machine safer. In the present embodiment, the overcurrent protection PTC also uses a ceramic PTC to improve the protection effect of the overcurrent PTC. Further in the present embodiment, the material composition of the overcurrent protection PTC is as described in the above embodiment.
[0054] 综上所述, 在本实用新型提供的过流保护电路中, 在幵关器件和负载连接端之 间串联了 2脚的过流保护 PTC, 电路在受到大电压冲击, 而导致电路中的电流急 剧增大吋, 过流保护 PTC的电阻会因为温度上升而急剧增大, 会使电路中的电流 很快衰减到很小的稳定值, 避免了电路中的元器件的损坏, 对电路的安全提供 了极大的保证。 本电路仅采用一种过流保护 PTC, 巧妙地应用它的特性, 达到了 低成本, 高可靠的保护洗衣机门锁的效果, 大大降低了整机厂售后维修频度与 维修成本, 提高了整机厂的商誉。 [0054] In summary, in the overcurrent protection circuit provided by the present invention, a 2-pin overcurrent protection PTC is connected in series between the switching device and the load connection end, and the circuit is subjected to a large voltage impact, resulting in a circuit. The current in the circuit increases sharply. The resistance of the overcurrent protection PTC will increase sharply due to the temperature rise, which will quickly attenuate the current in the circuit to a small stable value, avoiding damage to components in the circuit. The safety of the circuit provides great assurance. This circuit uses only one over-current protection PTC, cleverly applies its characteristics, achieves low-cost, high-reliability protection of the door lock of the washing machine, greatly reduces the frequency of maintenance and repair of the whole machine factory, and improves the overall cost. Goodwill of the machine factory.
[0055] 以上所述仅为本实用新型的较佳实施例而已, 并不用以限制本实用新型, 凡在 本实用新型的精神和原则之内所作的任何修改、 等同替换和改进等, 均应包含 在本实用新型的保护范围之内。
The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be It is included in the scope of protection of the present invention.
Claims
[权利要求 1] 一种电热式门锁保护电路, 其特征在于, 所述保护电路包括: [Claim 1] An electric door lock protection circuit, wherein the protection circuit includes:
串型连接的幵关器件、 过流保护 PTC以及负载连接端; Serial connection device, overcurrent protection PTC and load connection;
所述过流保护 PTC为 2脚的可板载的 PTC。 The overcurrent protection PTC is a 2-pin, onboard PTC.
[权利要求 2] 如权利要求 1所述的电热式门锁保护电路, 其特征在于, 所述过流保 护 PTC为陶瓷 PTC。 [Claim 2] The electrothermal door lock protection circuit according to claim 1, wherein the overcurrent protection PTC is a ceramic PTC.
[权利要求 3] —种洗衣机控制板, 其特征在于, 所述控制板上具有一个电热式门锁 的保护电路; [Claim 3] A washing machine control panel, wherein the control panel has a protection circuit for an electrothermal door lock;
所述保护电路如权利要求 1〜2任意一项所述。 The protection circuit is as claimed in any one of claims 1 to 2.
[权利要求 4] 一种洗衣机, 其特征在于, 所述洗衣机包括: [Claim 4] A washing machine, comprising:
洗衣机本体; 以及 Washing machine body;
设于所述洗衣机本体内的控制板, 所述控制板如权利要求 3所述。 A control panel disposed in the body of the washing machine, the control panel being as claimed in claim 3.
[权利要求 5] —种洗衣机电热式门锁, 其特征在于, 所述门锁包括: [Claim 5] A washing machine electric door lock, characterized in that: the door lock comprises:
过流保护 PTC, 所述过流保护 PTC为 2脚的可板载的 PTC; Overcurrent protection PTC, the overcurrent protection PTC is a 2-pin onboard PTC;
所述过流保护 PTC—端与主 PTC相连, 另一端与门锁端子相连。 The overcurrent protection PTC-terminal is connected to the main PTC, and the other end is connected to the door lock terminal.
[权利要求 6] 如权利要求 5所述的洗衣机电热式门锁, 其特征在于, 所述过流保护 P [Claim 6] The electric door lock of the washing machine according to claim 5, wherein the overcurrent protection P
TC为陶瓷 PTC。 TC is a ceramic PTC.
[权利要求 7] —种洗衣机, 其特征在于, 所述洗衣机包括: [Claim 7] A washing machine, comprising:
洗衣机本体; 以及 Washing machine body;
安装于所述洗衣机本体上的门锁, 所述门锁如权利要求 5〜6任意一项 所述。 A door lock mounted on the body of the washing machine, the door lock being as claimed in any one of claims 5 to 6.
[权利要求 8] —种门锁保护附件, 其特征在于, 所述门锁保护附件包括: [Claim 8] A door lock protection accessory, wherein the door lock protection accessory comprises:
过流保护 PTC, 所述过流保护 PTC为 2脚 PTC, 所述过流保护 PTC的两 引脚分别与所述门锁保护附件的两个端子相连。 Overcurrent protection PTC, the overcurrent protection PTC is a 2-pin PTC, and the two pins of the overcurrent protection PTC are respectively connected to two terminals of the door lock protection accessory.
[权利要求 9] 如权利要求 8所述的门锁保护附件, 其特征在于, 所述过流保护 PTC 为陶瓷 PTC。
[Claim 9] The door lock protection accessory according to claim 8, wherein the overcurrent protection PTC is a ceramic PTC.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2017/093948 WO2019014946A1 (en) | 2017-07-21 | 2017-07-21 | Electrothermal door lock protection circuit, control board, door lock, door lock protection accessory, and washing machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2017/093948 WO2019014946A1 (en) | 2017-07-21 | 2017-07-21 | Electrothermal door lock protection circuit, control board, door lock, door lock protection accessory, and washing machine |
Publications (1)
Publication Number | Publication Date |
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WO2019014946A1 true WO2019014946A1 (en) | 2019-01-24 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/CN2017/093948 WO2019014946A1 (en) | 2017-07-21 | 2017-07-21 | Electrothermal door lock protection circuit, control board, door lock, door lock protection accessory, and washing machine |
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Citations (6)
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CN1049570A (en) * | 1989-08-18 | 1991-02-27 | 武汉市无线电元件分厂 | Low resistance ceramic thermistor material, preparation technology and application thereof |
WO1991012643A1 (en) * | 1990-02-08 | 1991-08-22 | Asea Brown Boveri Ab | Device for motor and short-circuit protection |
CN2147690Y (en) * | 1992-12-31 | 1993-11-24 | 中山市威力洗衣机厂 | Electric brake device for motor of domestic electric appliances |
US5969928A (en) * | 1997-12-03 | 1999-10-19 | Gould Electronics Inc. | Shunt for circuit protection device |
CN201263085Y (en) * | 2008-08-27 | 2009-06-24 | 南京乐金熊猫电器有限公司 | Over current protection unit of washing machine |
CN204559325U (en) * | 2014-02-13 | 2015-08-12 | 科普莱赛泰克公司 | Especially the household electrical appliance of washing machine or dishwasher |
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2017
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Publication number | Priority date | Publication date | Assignee | Title |
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CN1049570A (en) * | 1989-08-18 | 1991-02-27 | 武汉市无线电元件分厂 | Low resistance ceramic thermistor material, preparation technology and application thereof |
WO1991012643A1 (en) * | 1990-02-08 | 1991-08-22 | Asea Brown Boveri Ab | Device for motor and short-circuit protection |
CN2147690Y (en) * | 1992-12-31 | 1993-11-24 | 中山市威力洗衣机厂 | Electric brake device for motor of domestic electric appliances |
US5969928A (en) * | 1997-12-03 | 1999-10-19 | Gould Electronics Inc. | Shunt for circuit protection device |
CN201263085Y (en) * | 2008-08-27 | 2009-06-24 | 南京乐金熊猫电器有限公司 | Over current protection unit of washing machine |
CN204559325U (en) * | 2014-02-13 | 2015-08-12 | 科普莱赛泰克公司 | Especially the household electrical appliance of washing machine or dishwasher |
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