WO2003105172A1 - 直流電流遮断スイッチ - Google Patents
直流電流遮断スイッチ Download PDFInfo
- Publication number
- WO2003105172A1 WO2003105172A1 PCT/JP2003/006412 JP0306412W WO03105172A1 WO 2003105172 A1 WO2003105172 A1 WO 2003105172A1 JP 0306412 W JP0306412 W JP 0306412W WO 03105172 A1 WO03105172 A1 WO 03105172A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- current
- contact
- ptc
- cutoff switch
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
- H01H1/504—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by thermal means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/42—Impedances connected with contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/16—Impedances connected with contacts
- H01H33/161—Variable impedances
- H01H2033/163—Variable impedances using PTC elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
- H01H2037/5481—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting the bimetallic snap element being mounted on the contact spring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/02—Bases; Casings; Covers
- H01H50/021—Bases; Casings; Covers structurally combining a relay and an electronic component, e.g. varistor, RC circuit
Definitions
- the present invention relates to a direct current cutoff switch, and more particularly, to a direct current cutoff switch that suppresses melting of contacts and reduces damage by suppressing the time of occurrence of a contact opening arc in a high-voltage current circuit.
- a switch used for turning on and off a current circuit of a DC power supply in, for example, an electric component of an automobile or an electronic product driven by a rechargeable battery.
- the main power source for driving the electrical components of conventional automobiles using such switches is 12 V DC or 24 V DC, and portable electronic devices that use rechargeable batteries are also used.
- the main power source was DC 12 V.
- the voltage of the power supply used for such products is generally called high voltage.
- the specified voltage is 30 V or more, and the maximum voltage in terms of safety in a global standard is 42 V. From this point, it is considered that the safe power supply voltage required to achieve the high power and drive output required for the various electric appliances described above is a high voltage in the range of 30 to 42 V.
- the DC obtained by rectifying the commercial power supply voltage used inside the equipment is even higher, ranging from 140 V to 300 V.
- switches for current circuits are required to handle high-voltage and large-current so that they can be used for turning on and off the high-voltage power supply as described above. There is one problem with the switch of the conventional current circuit described above. It is the problem of melting contacts due to surge voltage.
- This phenomenon is particularly noticeable when the gap between the contacts that are opened when the current is interrupted is small or when the arc between the contacts becomes larger than a certain level, and the arc once generated between the contacts may be cut off instantaneously. In many cases, it lasts for several tens of milliseconds. If the arc continues for several tens of milliseconds, the arc will Since it generates heat, it melts the contacts and causes welding between the contacts, causing a short circuit.Also, even if the contacts are successfully stopped in an open state, the surrounding insulating members melt with the heat of the arc. However, there has been a problem that there is a possibility of causing troubles such as smoking and ignition.
- surge voltage absorbing elements that absorb surge voltage (or surge current) are known.
- a varistor, a silicon surge absorber, or a gas arrester using discharge has been known.
- these are all intended to absorb the surge voltage of a large value at the time of abnormality, which is different from the working voltage, up to the surge limit voltage, and to protect the circuit driven by the working voltage from the abnormal surge voltage. Yes, it does not absorb surge voltage with a value that is not much different from the operating voltage, such as when a switch is opened or closed.
- the functional characteristics of the surge voltage absorbing element are to narrow the operating voltage range with respect to the surge limit voltage. The difference up to the surge limit voltage is set as a safety margin.
- a surge voltage absorbing element that has the characteristic of absorbing a large voltage at the time of abnormality different from the working voltage and having a safety margin set between the working voltage and the surge limit voltage is replaced with a normal switch. Even when used between contacts, the surge voltage at the time of switch opening and closing is a voltage with a value that is not much different from the operating voltage, so the surge voltage absorbing element does not operate, that is, a function to absorb surge voltage Can not fulfill.
- PTC Platinum Temperature Coefficient
- PTC has a characteristic that a large current flows at the initial stage and then attenuates and is suppressed to a small current. Therefore, it is used not only to prevent excessive current, but also as a heating element with a rapid rise in temperature. Alternatively, it is also used as a contactless switch for starting the motor. In any case, PTC has never been used as a surge current absorbing element at the time of current interruption, nor has it been considered as such.
- the surge voltage absorbing element has the property of absorbing the surge voltage by lowering its resistance value by self-heating at a higher voltage, and in the worst case, it may run out of heat due to further overvoltage. There is a danger of self-destruction and, consequently, short-circuiting of the circuit to be protected. Therefore, from this point as well, the conventional surge voltage absorbing element has been considered only as an element that absorbs a surge voltage much higher than the power supply voltage generated at the switch contact.
- An object of the present invention is to provide a relay type and a thermal protector type in view of the above-mentioned conventional circumstances. Regardless of the above, it is an object of the present invention to provide a switch that has a small configuration and can safely shut off a large DC current at a high voltage without melting or damaging the contacts. Disclosure of the invention
- the direct current cutoff switch has a conductive fixed member and a movable member provided with an insulating member interposed therebetween, and the fixed member is a fixed contact formed at a predetermined position.
- the movable member has a movable contact formed at a position facing the fixed contact, and is connected to the external circuit.
- the movable member is connected to a portion and is operable to press or open the movable contact with respect to the fixed contact, and is in contact with the fixed contact; operating the movable member to open the movable contact from the fixed contact;
- a DC power cutoff switch for cutting off a DC current flowing between terminals connected to the external circuit, thereby forming an arbitrary columnar shape and having electrodes on opposing surfaces of the columnar shape.
- a non-linear resistance element connected in parallel with a contact circuit formed by the fixed contact and the movable contact, wherein the non-linear resistance element has a contact-to-contact voltage when the DC current is cut off by opening the movable contact. It is configured to have a characteristic having a resistance value variation region showing a minimum resistance value during the transition from 0 V to the power supply voltage.
- the non-linear resistance element is a PTC (Positive Temperature Coefficient), and the contact open voltage when the above DC large current is cut off by opening the movable contact is between 28 V and 48 V. Configured to be a range.
- the PTC is configured to have a voltage-current characteristic in which, for example, the upper limit voltage or the minimum point in a range where thermal runaway does not occur is 80 V or more. Current position between 2 V and 20 V It is configured with certain voltage and current characteristics.
- the external circuit is preferably, for example, a circuit rated at DC 42 V or a circuit for driving an inductive load.
- the movable member may be configured to be driven by, for example, a bimetal.
- the external circuit is a charge-side circuit or a charge / discharge circuit of a secondary battery pack exceeding 28 V, and is used for charging.
- the circuit be configured so that the open circuit voltage when the movable contact is opened during charge / discharge does not exceed 5 OV.
- the PTC is, for example, T c (Curie temperature ) Is preferably set to a value higher than the operating temperature of the bimetal.
- the movable member may be configured to be driven by an electromagnetic coil, for example, as set forth in claim 8.
- the non-linear resistance element is provided, for example, at the fixed contact point or at an intermediate portion between the movable contact and the connection terminal portion, and an arc generated between the contacts when the movable contact is opened. Is configured to prevent the message from continuing for more than 2 milliseconds.
- the nonlinear resistance element is constituted by a PTC (Positive Temperature Coefficient), and for example, the contact open voltage when the DC large current is cut off by opening the movable contact is in a range of 130 V to 310 V. Can also be set to.
- PTC Platinum Temperature Coefficient
- the PTC with specially set voltage / current characteristics and temperature characteristics is connected in parallel to the switch contact circuit, so that the switch is opened even if the switch contact is opened and the high-voltage current is cut off. Since the circuit is formed, surge voltage is unlikely to occur, and then the PTC passes through the minimum resistance area and completes the current interruption operation, so that, for example, without setting a wide gap between the opened contacts, High-voltage DC current of 30 to 50 V, especially 130 V to 310 V can be cut off quickly and reliably. This makes it possible to reduce the size of the switch mechanism, easily deal with the recent reduction in the size of electronic devices, and expand the applications for convenience.
- FIG. 1 is a side sectional view of a thermostat as a direct current cutoff switch and a diagram showing an external circuit to which the thermostat is connected in one embodiment.
- FIG. 2 is an exploded perspective view showing the internal configuration of the thermostat.
- FIG. 3 is a circuit diagram showing a connection relationship between the thermostat and an external circuit.
- FIG. 3A is a diagram showing a state where the switch is closed
- FIG. 3B is a diagram showing a state where the switch is opened.
- Figure 4 is a voltage-current characteristic diagram obtained by prototyping various PTCs as samples and examining the relationship between their voltage and current through experiments.
- Fig. 5 is a chart showing the main characteristics of each PTC obtained from the voltage-current characteristics diagram in numerical values for easy understanding.
- FIG. 6 (a) shows the change process when a current of 42 V is cut off by a conventional thermostat without PTC for comparison, and (b) shows the process of the present invention with PTC provided.
- FIG. 9 is a diagram showing a process of change when a current of 42 V is cut off by a thermostat.
- FIG. 7 is a diagram showing a side cross section of an electromagnetic relay as another embodiment, in which (a) shows a contact open state and (b) shows a contact closed state. About the sign Thermostat
- the DC cutoff switch of the present invention incorporates a PTC configured to have special characteristics, and the characteristics of this PTC will be described later.
- FIG. 1 is a side sectional view of a thermostat as a direct current cutoff switch according to one embodiment, and a diagram showing an external circuit to which the thermostat is connected.
- FIG. 2 is an exploded perspective view showing the internal configuration of the thermostat.
- the thermostat 1 first includes a housing 2 and a A frame-shaped support member 3 fixed to one inner wall surface of the housing 2, and a conductive fixing member interposed between the bottom of the support member 3 and the inner wall surface of the housing 2.
- a fixing plate 4 is provided in the frame of the support member 3, a square pillar-shaped PTC 5 as a nonlinear resistance element is accommodated.
- the shape of the PTC 5 is not limited to a quadrangular prism, but may be an arbitrary prism such as a triangular prism, a polygonal prism having five or more angles, or a circular cylinder.
- the fixing plate 4 includes a connection terminal portion 4-11 formed to be connected to one terminal 7-1 of the connection terminal 7 (7-1, 7-2) of the external circuit 6, and a predetermined position. (In the example shown in the figure, near the end opposite to the connection terminal section 41 1). Further, the fixing plate 4 includes a connection surface 4_3 exposed at a lower opening of the frame-shaped support member 3. This connection surface 4-3 is connected to one (lower surface) electrode surface 5-1 of the PTC 5.
- a slope 3-1 is formed at the center of the frame end connected to the end of the slope 3-1.
- a bimetal fulcrum projection 3-2 is formed at the center of the upper surface.
- An engaging protrusion 3-3 is formed which engages with the movable plate and the holding plate to be positioned and determines the positions thereof.
- a movable plate 8 as a conductive movable member is disposed on the fixed plate 4, the support member 3, and the PTC 5 so as to overlap with each other.
- the movable plate 8 has a connection terminal 8-1 formed to be connected to the other terminal ⁇ -2 of the connection terminal 7 of the external circuit 6 and a fixed contact 4-2 of the fixed plate 4. It has a movable contact point 8-2 formed at the opposing position.
- the movable plate 8 has a fixed portion 8-4 positioned and fixed by an engagement notch 8-3 engaging with the engagement protrusion 3-3 of the support member 3, and a fixed portion 8-4. It comprises a movable part 8-7 having a forked connecting part 8-6 connected through two folds 8-5.
- the fixed terminal 8-4 has the above-described connection terminal portion 8-1 formed at the outer end thereof, and the inner end 8-8 opposed thereto is bifurcated with the movable portion 8-7. It is formed so as to protrude into the cut portion 8-9 of the shape-like connecting portion 8-6. The lower surface of this inner end 8-8 is connected to the other (upper surface) electrode surface 5_2 of the PTC 5.
- a bimetal locking claw 8-10 is formed at the outer end in such a manner as to be folded inward at an upper side, and the movable contact 8-2 described above is formed inside the vicinity thereof. It is formed in a downward convex shape.
- a bimetal fulcrum projection through hole 8-11 is formed further inside, that is, closer to the fixing portion 8-4.
- the bimetal 9 is made of a two-piece metal piece that always has a warp, and the warp reverses at a predetermined temperature as a boundary. Within the normal operating temperature of the thermostat 1, the warp of the bimetal 9 is convex upward, and one end of the bimetal 9 is engaged with the bimetal locking claw 8-10 of the movable plate 8 and locked to the movable plate 8. The other end is clamped by the holding plate 10 on the fixed portion 8-4 of the movable plate 8, and the two engaging notches 10-1 of the holding plate 10 are engaged with the engaging projections 3 of the support member 3. The other end of the bimetal 9 is fixed to the non-inclined upper surface of the support member 3 together with the fixed portion 8-4 of the movable plate 8 by being locked to the respective members.
- thermostat 1 When the temperature exceeding is transmitted to the bimetal 9, the bimetal 9 reverses the warp and changes its shape to a concave shape. As a result, the movable portion 6-7 of the movable plate 8 is lifted upward through the bimetal locking claw 8-10, and the movable contact 8-2 is separated from the fixed contact 4-2 by a distance. It is opened.
- the movable plate 8 is configured to be able to press or open the movable contacts 8-2 against the fixed contacts 412.
- the external circuit 6 to which the thermostat 1 is connected is composed of a power supply 11, a load 12 and a power supply switch 13 as schematically shown in FIG. 1, and has the aforementioned connection terminals 7 (7-1, 1, 7-2). ).
- FIG. 3A is a circuit diagram showing a connection relationship between the thermostat 1 and the external circuit 6 in FIG. 1, and FIG. 3B is a diagram showing a state in which the switch of the thermostat 1 is open.
- FIG. 3A the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals as those in FIGS. Fig. 3 (b) has the same configuration as Fig. 3 (a) except that the switch is open, so that only the components necessary for the description are numbered and the other components are numbered. Is not shown.
- the PTC 5 is connected by its electrode 5-1 in parallel with the contact circuit formed by the fixed contact point 4-2 and the movable contact point 8_2. I have.
- the switch of thermostat 1 is closed as shown in FIG. 2 (a)
- the voltage between the two electrodes 5-1 is almost “0”. No current flows through PTC 5 having a predetermined resistance value based on 5 ° C.
- the PTC 5 is provided between the fixed contact 412 and the movable contact 4-2. Because they are connected, the entire circuit is a closed circuit even if the contacts are opened, and therefore, surge voltage is unlikely to occur. In addition, since the power supply voltage is applied to PTC 5, PTC 5 instantaneously generates heat, and the generated heat reduces the resistance to a value at which a predetermined peak current based on the characteristics of PTC 5 flows, thereby generating a surge current. Hard to let.
- Figure 4 shows prototypes of various PTCs with different characteristics as samples to obtain PTC 5 having the above characteristics (voltage-current characteristics). It is a voltage-current characteristic diagram obtained by plotting the results. In the figure, the horizontal axis shows voltage (V), and the vertical axis shows current (A). In this figure, the scale is shown in logarithm on both the horizontal and vertical axes.
- Fig. 5 is a table that shows the main characteristics of each PTC obtained from the above-mentioned voltage-current characteristics diagram by numerical values for easy understanding.
- the resistance value shown at the left end of each characteristic curve in the voltage-current characteristic diagram shown in FIG. 4 indicates the resistance value at 25 ° C.
- the resistance value under the environmental temperature condition of 25 ° C is a standard for specially identifying the PTC which is a nonlinear resistance element.
- the resistance values shown at the left end of each characteristic curve in the voltage / current characteristic diagram in Fig. 4 are 7 ⁇ , 15 ⁇ , 30 ⁇ , 50 ⁇ , 30 ⁇ , 50 ⁇ , 100 ⁇ , 200 ⁇ , 300 ⁇ , 5 ⁇ (50 As shown in Fig. 5, sample numbers from No. 1 to No. 11 are assigned to PTCs with a resistance value of 00) ⁇ and 10 (10000) ⁇ , respectively.
- the characteristics of P-C including thermal runaway will be described.
- the characteristics of the PTC when the power supply voltage is 100 V or 200 V, an initial resistance of about 5 k ⁇ to 10 k ⁇ is used.
- the position of the current peak is a PTC with a characteristic of 50 V or more.
- the arc generated at the time of breaking and breaking does not decrease in resistance, and the situation is almost the same as when a fixed resistance is connected.
- the voltage across the thermostat divided by the load resistance does not decrease so much that the arc cannot be reduced.
- the PTC when the thermostat is shut off Is applied above the voltage that generates the minimum resistance value.
- a PTC is connected in parallel between the contacts that shut off the power supply, and the voltage between the thermostat terminals changes in a very short time from OV to the voltage excluding the drop at the load.
- the circuit between the thermostat terminals is clamped by the PTC and the circuit is interrupted, the circuit remains a closed circuit with no open part, making it difficult for transient surge voltages to occur.
- the PTC has a minimum resistance interval between the voltage changes at both ends, and the current flowing through the PTC also has a peak.
- the peak of the voltage / current characteristic is around 10 V, and the current at 42 V is 0.015 A as seen from this static characteristic, but the In this case, it will go through the peak of 0.045 A.
- the minimum resistance is calculated to be about 222 ⁇ , but this resistance is connected in parallel with the arc during the interruption process, and the resistance has the minimum value. Is also suppressed, and the arc is extinguished during the interruption process.
- the maximum voltage of two series of 12 V batteries is 28 V
- the maximum voltage of three series batteries is 42 V.
- the voltage from 28 V is effective to set the peak current at a voltage lower than 28 V, specifically, up to 20 V. This ability increases with decreasing resistance, but PTC If an excessive voltage is applied, that is, if a voltage exceeding the self-control capability limit is applied, the current rapidly increases and enters a region of thermal runaway.
- the point where the curve starts to rise when an excessive voltage is applied corresponds to the region where the resistance increases with respect to voltage (lower right) Although the figure looks almost horizontal, the right end actually rises slightly).
- This point is called a minimum point or a pressure limit point, and beyond this point, the PTC enters the above-mentioned thermal runaway region, and eventually causes self-destruction, so it is also called a thermal runaway occurrence point.
- PTC has an upper limit condition for the voltage, and this upper limit condition is the minimum point (thermal runaway occurrence point) of the above curve. Then, it is necessary to secure the safety by setting the voltage at the minimum point of this curve at least twice as much as the voltage normally used, and 80 V is a standard. If this condition is specified by the peak current value of the voltage-current characteristics, the characteristics on the low voltage side lower than 2 V will not have sufficient withstand voltage characteristics on the high voltage side, so the range is approximately 2 V to 2 OV. Can be limited.
- the peak current position (V) shown in the peak current position column 14-14 indicates the position of the voltage at which the initial current flowing through the PCT is maximized. It is better that the current flowing through the PCT 5 immediately after the switch is opened as shown in Fig. 3 (b) is the largest. To maximize the current that flows immediately after the switch is opened as shown in Fig. 3 (a), Considering that the voltage applied to PCT 5 immediately before opening is almost “0”, the smaller the peak current position (V), the better. Then, since Samples No. 1 and No. 2 have already been excluded, looking at the remaining Samples No. 3 to No. 11, Samples No. 3 to No. 9 show the peak current positions (V ) Is in the single digit range, and sample No. 10 and No. 11 have the peak current position (V) higher than the working voltage (48 V or less in this example). Are excluded from recruitment. Therefore, the remaining samples to be adopted are samples No. 3 to No. 9.
- the samples No. 3 to No. 9 left in this way are PCTs that can be used safely without thermal runaway at the target voltage (48 V or less).
- Such a PTC has voltage-current characteristics in which the position of the peak current is in the range of 2 V to 20 V.
- the minimum point positions of the samples No. 3 to No. 9 are between 60 and 170 V. And is 42 V or more.
- the PTCs of samples No. 3 to No. 5 can be said to have favorable characteristics because the position of the minimum point is 80 V or more, which is almost twice the above-mentioned rated voltage of the power supply of 42 V. As shown in FIGS. 3 (a) and 3 (b), it turns out that these are suitable for the PTC 5 to be connected in parallel to the switch part of the thermostat 1 connected to the external circuit 6.
- PTC has a starting point of a temperature region in which the resistance value rapidly increases, and this temperature is called a Curie temperature (Tc). This temperature is defined as the temperature corresponding to twice the minimum resistance. The minimum resistance value is the position (V) of the peak current shown in Fig. 5.
- FIG. 6 (a) is a diagram showing the current change process when a current of 42 V is cut off by a conventional thermostat without a PTC for comparison
- FIG. 8 is a diagram showing a process of current change when a current of 42 V is cut off by the thermostat 1 of the present invention in which a PTC is provided.
- the horizontal axis represents time
- the vertical axis represents voltage
- the time scale on the horizontal axis in (a) is a scale every 20 milliseconds
- the time scale on the horizontal axis in (b) is a scale every 2 milliseconds.
- the switch contacts are opened, the voltage of 42 V is cut off, the current between the contacts is completely cut off, and the voltage is 0 V (in this case, the current means 0,
- the time t1 until the time becomes a little over 70 milliseconds have elapsed. That is, it means that the arc 15 was generated between the contacts during this period, and the generation of the arc 15 continued for more than 70 milliseconds. If the arc is generated continuously for more than 70 milliseconds, the contacts are easily melted and short-circuited due to fusion between the contacts, destroying the switch.
- the switch contacts are opened to cut off the voltage of 42 V, the current between the contacts is completely cut off, and the voltage becomes OV.
- the lapse of time until time T2 is less than 1 millisecond. In other words, high-voltage DC current can be reliably cut off at a speed of approximately 170 or less than that of conventional switches.Since no arc is generated, the contacts do not melt and the switch life is significantly extended. I do.
- a thermostat has been described as an example.
- an electromagnetic relay may be used without being limited to the thermostat. This will be described below as another embodiment.
- FIGS. 7A and 7B show a side cross section of an electromagnetic relay according to another embodiment.
- FIG. 7 (a) shows a state where a contact is open, and FIG. It is a figure showing a closed state.
- the electromagnetic relay 16 as a direct current cutoff switch shown in FIGS. 7A and 7B is supported by a support member 18 that occupies a large portion of the housing 17, and the coil 19 9-1 and the core 19 9 An electromagnet 19 composed of _2 is provided.
- one end of the movable member 20 having a hook-shaped cross section in the long axis direction of the hook is arranged to face each other.
- a movable contact 21 is provided at the other end of the movable member 20 in the short axis direction of the hook via a support arm 22.
- a spring member 23 and a connection plate are provided at the other end of the movable member 20 in the short axis direction.
- a connection terminal portion 25 electrically connected via 24 is provided.
- the connection terminal 25-1 of the connection terminal portion 25 penetrates the bottom of the housing 17 and protrudes outside.
- a fixed contact 27 provided on the upper surface of the fixed member 26 is disposed below the movable contact 21 at a position facing the movable contact 21.
- the fixing member 26 includes a connection terminal portion that penetrates through the bottom of the housing 17 and protrudes to the outside, and further includes a connection plate 29 that is disposed in close contact with the inner bottom surface of the housing 17. I have.
- a PTC 30 is interposed between the connection plate 29 and a connection plate 24 electrically connected to the movable contact 21 via a support arm 22 and a spring member 23. The electrode surface is connected to the connection plate 24, and the lower electrode surface is connected to the connection plate 29.
- connection terminals 28 and 25-1 are connected to the external circuit 6 shown in FIG.
- connection terminals 7-1 and 7-2 the same circuit as the circuit shown in Fig. 3 (a) is configured.
- the PTC 30 Since the PTC 30 is connected in parallel to the contact circuit consisting of the movable contact 21 and the fixed contact 27, no arc is generated between the opened movable contact 21 and the fixed contact 27 in this case as well.
- the current is interrupted within at least 2 ms.
- the PTC with an initial resistance of about 5 k ⁇ to 10 k ⁇ shown in Samples No. 10 and No. 11 has the current peak position with respect to the voltage within the range where thermal runaway does not occur due to voltage and current durability. Since the voltage is 50 V or more, it is almost the same situation as a fixed resistor is connected because the resistance to arc generated at the time of breaking and breaking when used for high voltage of 30 to 42 V is not accompanied. It was explained that the arc could not be reduced because the voltage at the section did not decrease so much, but only when used at a high voltage of 30 to 42 V.
- the PTC with an initial resistance of about 5 k ⁇ to 10 k ⁇ shown in sample Nos. 10 and 11 above has a peak current position in the range of 40 V to 60 V, and a minimum point of 250 V to 350 V or more. Therefore, for DC high voltage of 140 V to 300 V obtained by regulating the commercial power supply voltage used inside the equipment, sample No. 3 to No. 9 for high voltage of 30 to 42 V (preferably Can be used in parallel with the switch as in the case of the PTC of No. 5), and the same effects as described above can be obtained.
- the DC current cutoff switch according to the present invention is a DC current cutoff switch that suppresses the occurrence of a contact opening arc of a high-voltage current circuit, prevents melting of contacts, and reduces damage. It can be used in all industries that use DC cutoff switches that block DC current.
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- Thermally Actuated Switches (AREA)
- Thermistors And Varistors (AREA)
- Keying Circuit Devices (AREA)
- Relay Circuits (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/517,164 US7330097B2 (en) | 2002-06-11 | 2003-05-22 | Direct current cutoff switch |
EP03730587A EP1513173B1 (en) | 2002-06-11 | 2003-05-22 | Direct current cutoff switch |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-169761 | 2002-06-11 | ||
JP2002169761A JP2004014434A (ja) | 2002-06-11 | 2002-06-11 | 直流電流遮断スイッチ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003105172A1 true WO2003105172A1 (ja) | 2003-12-18 |
Family
ID=29727742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/006412 WO2003105172A1 (ja) | 2002-06-11 | 2003-05-22 | 直流電流遮断スイッチ |
Country Status (5)
Country | Link |
---|---|
US (1) | US7330097B2 (ja) |
EP (1) | EP1513173B1 (ja) |
JP (1) | JP2004014434A (ja) |
CN (1) | CN100361243C (ja) |
WO (1) | WO2003105172A1 (ja) |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2609452A1 (en) * | 2005-05-25 | 2006-11-30 | Callsmart Uk Limited | Thermal protection for electrical installations and fittings |
US7800477B1 (en) * | 2007-03-20 | 2010-09-21 | Thermtrol Corporation | Thermal protector |
US8421580B2 (en) * | 2008-01-28 | 2013-04-16 | Uchiya Thermostat Co., Ltd. | Thermal protector |
WO2009125458A1 (ja) | 2008-04-10 | 2009-10-15 | ウチヤ・サーモスタット株式会社 | 外部操作型サーマルプロテクタ |
US20110140827A1 (en) * | 2008-04-18 | 2011-06-16 | Katsuaki Suzuki | Circuit protection device |
US7952461B2 (en) * | 2008-05-08 | 2011-05-31 | Cooper Technologies Company | Sensor element for a fault interrupter and load break switch |
US7936541B2 (en) | 2008-05-08 | 2011-05-03 | Cooper Technologies Company | Adjustable rating for a fault interrupter and load break switch |
US8004377B2 (en) * | 2008-05-08 | 2011-08-23 | Cooper Technologies Company | Indicator for a fault interrupter and load break switch |
US7920037B2 (en) * | 2008-05-08 | 2011-04-05 | Cooper Technologies Company | Fault interrupter and load break switch |
US8153916B2 (en) * | 2008-08-14 | 2012-04-10 | Cooper Technologies Company | Tap changer switch |
US8013263B2 (en) * | 2008-08-14 | 2011-09-06 | Cooper Technologies Company | Multi-deck transformer switch |
KR101588486B1 (ko) * | 2008-12-04 | 2016-02-12 | 쿠퍼 테크놀로지스 컴파니 | 저동력 저오일 트립 메커니즘 |
US9000880B2 (en) * | 2009-03-12 | 2015-04-07 | Uchiya Thermostat Co., Ltd. | Thermal protector |
CN102341878B (zh) * | 2009-03-12 | 2014-02-12 | 打矢恒温器株式会社 | 热控开关 |
US9472363B2 (en) | 2009-03-12 | 2016-10-18 | Uchiya Thermostat Co., Ltd. | Thermal protector |
JP2011078282A (ja) * | 2009-10-01 | 2011-04-14 | Sony Corp | 電池パック |
DE112010004265B4 (de) | 2009-11-04 | 2023-07-20 | Uchiya Thermostat Co., Ltd. | Elektrische Schaltkreise mit einem Wärme- Schutzschalter mit drei Anschlüssen sowie dazugehörige Anschlussverfahren |
CN103081051B (zh) * | 2010-09-24 | 2015-12-16 | 埃伦贝格尔及珀恩斯根有限公司 | 微型安全开关 |
CN103380555B (zh) * | 2010-12-16 | 2015-09-16 | 泰科电子日本合同会社 | 保护装置 |
US8941461B2 (en) | 2011-02-02 | 2015-01-27 | Tyco Electronics Corporation | Three-function reflowable circuit protection device |
US9455106B2 (en) * | 2011-02-02 | 2016-09-27 | Littelfuse, Inc. | Three-function reflowable circuit protection device |
JP5966247B2 (ja) | 2011-03-01 | 2016-08-10 | ソニー株式会社 | 電池パック、蓄電システム、電子機器、電動車両、電力システムおよび制御システム |
US9159985B2 (en) * | 2011-05-27 | 2015-10-13 | Ostuka Techno Corporation | Circuit breaker and battery pack including the same |
DE102011056577C5 (de) * | 2011-12-19 | 2015-02-19 | Sma Solar Technology Ag | Schaltungsanordnung zur Unterdrückung eines bei einem Schaltvorgang auftretenden Lichtbogens |
US9460876B2 (en) * | 2011-12-22 | 2016-10-04 | Komatsulite Mfg. Co., Ltd. | Breaker, and safety circuit and secondary battery circuit provided with the same |
JP2013246977A (ja) * | 2012-05-25 | 2013-12-09 | Komatsulite Mfg Co Ltd | ブレーカー及びそれを備えた安全回路並びに2次電池回路 |
US9831054B2 (en) * | 2014-03-27 | 2017-11-28 | Littelfuse, Inc. | Insulated thermal cut-off device |
JP6408822B2 (ja) * | 2014-07-30 | 2018-10-17 | ボーンズ株式会社 | ブレーカー及びそれを備えた安全回路並びに2次電池回路 |
JP2016035822A (ja) * | 2014-08-01 | 2016-03-17 | 株式会社小松ライト製作所 | 電気部品及びそれを備えた回路基板並びに2次電池回路。 |
DE112016006303B4 (de) * | 2016-01-26 | 2023-06-15 | Uchiya Thermostat Co., Ltd. | Temperaturschalter und Temperaturschalter-Isoliergehäuse |
WO2020003596A1 (ja) * | 2018-06-27 | 2020-01-02 | ウチヤ・サーモスタット株式会社 | 電子機器 |
CN109801811A (zh) * | 2019-03-19 | 2019-05-24 | 广州安的电子技术有限公司 | 温度开关 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5112697Y1 (ja) * | 1973-03-15 | 1976-04-06 | ||
JPS56169344U (ja) * | 1980-05-17 | 1981-12-15 | ||
JP2001035330A (ja) * | 1999-07-22 | 2001-02-09 | Uchiya Thermostat Kk | サーマルプロテクタ |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1154555B (de) * | 1961-02-09 | 1963-09-19 | Siemens Elektrogeraete Gmbh | Mit Kontakten arbeitende elektrische Schalteinrichtung |
FR1380789A (fr) * | 1963-11-05 | 1964-12-04 | Parsons C A & Co Ltd | Améliorations aux dispositifs de coupure du courant électrique |
DE1638052A1 (de) * | 1968-01-18 | 1971-03-11 | Kaiser & Co Leuchten Kg | Elektrische Abschalteinrichtung |
US3840834A (en) * | 1972-12-18 | 1974-10-08 | Texas Instruments Inc | Protector/indicator using ptc heater and thermostatic bimetal combination |
JPS5112697A (ja) | 1974-07-19 | 1976-01-31 | Matsushita Electric Ind Co Ltd | Fukugoerekutoretsutozairyo |
JPS56169344A (en) | 1980-05-30 | 1981-12-26 | Citizen Watch Co Ltd | Manufacture of ic |
DE3644514A1 (de) * | 1986-12-24 | 1988-07-07 | Inter Control Koehler Hermann | Bimetallschalter |
US4878038A (en) * | 1987-12-07 | 1989-10-31 | Tsai James T | Circuit protection device |
DE4206157A1 (de) * | 1992-02-28 | 1993-09-16 | Hofsass P | Thermoschalter |
US5629658A (en) * | 1992-08-18 | 1997-05-13 | Chen; William W. | Methods of arc suppression and circuit breakers with electronic alarmers |
JPH07282701A (ja) * | 1994-04-05 | 1995-10-27 | Texas Instr Japan Ltd | 自己保持型保護装置 |
US5737160A (en) * | 1995-09-14 | 1998-04-07 | Raychem Corporation | Electrical switches comprising arrangement of mechanical switches and PCT device |
US5864458A (en) | 1995-09-14 | 1999-01-26 | Raychem Corporation | Overcurrent protection circuits comprising combinations of PTC devices and switches |
JP2001504983A (ja) | 1997-08-25 | 2001-04-10 | スクウエアー ディー カンパニー | Ptc(正温度係数抵抗率)要素及び消弧能力を備えた電流制限回路遮断器 |
-
2002
- 2002-06-11 JP JP2002169761A patent/JP2004014434A/ja active Pending
-
2003
- 2003-05-22 US US10/517,164 patent/US7330097B2/en not_active Expired - Lifetime
- 2003-05-22 EP EP03730587A patent/EP1513173B1/en not_active Expired - Lifetime
- 2003-05-22 WO PCT/JP2003/006412 patent/WO2003105172A1/ja active Application Filing
- 2003-05-22 CN CNB038132850A patent/CN100361243C/zh not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5112697Y1 (ja) * | 1973-03-15 | 1976-04-06 | ||
JPS56169344U (ja) * | 1980-05-17 | 1981-12-15 | ||
JP2001035330A (ja) * | 1999-07-22 | 2001-02-09 | Uchiya Thermostat Kk | サーマルプロテクタ |
Also Published As
Publication number | Publication date |
---|---|
JP2004014434A (ja) | 2004-01-15 |
CN1659668A (zh) | 2005-08-24 |
EP1513173B1 (en) | 2012-11-07 |
EP1513173A4 (en) | 2008-12-31 |
US7330097B2 (en) | 2008-02-12 |
EP1513173A1 (en) | 2005-03-09 |
CN100361243C (zh) | 2008-01-09 |
US20050174211A1 (en) | 2005-08-11 |
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