CN102955550A - Stander type server system - Google Patents
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- CN102955550A CN102955550A CN201110265789XA CN201110265789A CN102955550A CN 102955550 A CN102955550 A CN 102955550A CN 201110265789X A CN201110265789X A CN 201110265789XA CN 201110265789 A CN201110265789 A CN 201110265789A CN 102955550 A CN102955550 A CN 102955550A
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Abstract
The invention provides a stander type server system, which comprises a power supply, a plurality of servers and a soft starting circuit coupled between the power supply and the plurality of servers, wherein the soft starting circuit is provided with an input end, a constant current source circuit, a biasing circuit, a first switching element and an output end; the input end is coupled to a first direct current voltage from the power supply; the constant current source circuit is coupled to the input end and supplies a constant current; the biasing circuit is coupled to the constant current source circuit and supplies a biasing voltage which rises slowly and has a preset upper limit value; the first switching element is provided with a first electrode, a second electrode and a first control electrode, the first electrode is coupled to the input end, the first control electrode is coupled to the biasing circuit, the biasing voltage drives the first switching element so that the first switching element can be transitioned from a stopped state to a saturated conducted state; and the output end is coupled to the second electrode of the first switching element, and when the first switching element is in the saturated conducted state, a second direct current voltage is output.
Description
Technical field
The invention relates to a kind of server system, especially about a kind of rack-mounted server system with soft starting circuit.
Background technology
Existing rack server (Rack Server), on the frame tens of station servers may be arranged, adopt the centralized power supply system of similar blade server (Blade Server), by the unified direct current of supplying with through step-down of frame, such as+12V DC voltage, and that these servers all need not is self-powered individually.
For existing rack server, the general Switching Power Supply that adopts is powered, but, for Switching Power Supply (especially high power switching power supply), all there is an intrinsic shortcoming: powering up moment, Switching Power Supply can produce a larger surge current, and this surge current may reach 10 times～100 times of power supply static working current.Because Switching Power Supply easily produces surge current, such as, all servers are started shooting simultaneously, will be so that Switching Power Supply produce strong surge current, this powers build-up of pressure even infringement to power supply and machine room.Another kind of common situation is to be, part of server is moved, and part of server is started shooting suddenly in addition, at this moment the lower voltage that the surge current that produces may cause power supply to provide can cause the server instant power-down of other normal operating conditions of using same input power when serious.
In view of this, how to design a kind of rack-mounted server system, so that during the one or more server normal boot-strap in the system, eliminate the surge current that produces, and the supply voltage of maintained switch power supply is stable, is a problem needing to be resolved hurrily of person skilled in the industry.
Summary of the invention
In order to address the above problem, the present invention proposes a kind of rack-mounted server system, comprise a power supply unit and a plurality of server, power supply unit is used for providing normal operation required operating voltage to a plurality of servers, this server system also comprises a soft starting circuit, be coupled between power supply unit and a plurality of server, this soft starting circuit has: an input end is coupled to one first DC voltage from power supply unit; One constant-current source circuit is coupled to input end, and a steady current is provided; One biasing circuit is coupled to constant-current source circuit, the bias voltage that a rising is provided and has a preset upper limit value; One first on-off element, have one first electrode, one second electrode and one first control electrode, the first electrode is coupled to input end, the first control electrode is coupled to biasing circuit, drive the first on-off element by bias voltage, in order to make the first on-off element from cut-off state to the saturation conduction status transition; And an output terminal, be coupled to the second electrode of the first on-off element, when the first on-off element saturation conduction, export one second DC voltage.
Preferably, above-mentioned the first on-off element is the P-channel field-effect transistor (PEFT) pipe.
Preferably, above-mentioned constant-current source circuit comprises: one first diode, and its positive pole is coupled to above-mentioned input end; One second diode, its positive pole is coupled to the negative pole of the first diode; One second switch element has a third electrode, one the 4th electrode and one second control electrode, and third electrode is coupled to the negative pole of the second diode, and the 4th electrode sees through one first resistance and is coupled to an earth terminal; And one the 3rd on-off element, having one the 5th electrode, one the 6th electrode and one the 3rd control electrode, the 3rd control electrode couples the second control electrode, and the 5th electrode sees through one second resistance and is coupled to above-mentioned input end.
Preferably, above-mentioned second switch element and above-mentioned the 3rd on-off element are transistor.
Preferably, above-mentioned biasing circuit comprises: one first electric capacity, one end are coupled to above-mentioned the 6th electrode, and the other end is coupled to above-mentioned earth terminal, and the above-mentioned steady current that provides by above-mentioned constant-current source circuit charges, so that above-mentioned bias voltage to be provided; An and voltage stabilizing diode, its positive pole is coupled to above-mentioned earth terminal, and negative pole is coupled to above-mentioned the 6th electrode, when the bias voltage that loads on above-mentioned the first electric capacity two ends reaches above-mentioned preset upper limit value, above-mentioned voltage stabilizing diode conducting is so that above-mentioned the first electric capacity stops charging.
Preferably, above-mentioned biasing circuit also comprises: one the 4th on-off element, have one the 7th electrode, one the 8th electrode and one the 4th control electrode, the 4th control electrode couples mutually with above-mentioned the first electric capacity, above-mentioned voltage stabilizing diode and the 6th electrode, the 7th electrode sees through one the 3rd resistance and is coupled to above-mentioned earth terminal, and the 8th electrode couples mutually and sees through one the 4th resistance and is coupled to above-mentioned input end with above-mentioned the first control electrode.
Preferably, above-mentioned soft starting circuit also comprises: one second electric capacity, one end are coupled to above-mentioned the second electrode, and the other end is coupled to above-mentioned earth terminal.
Preferably, above-mentioned soft starting circuit also comprises: a relay, have a contact part and a coiler part, contact part be connected in parallel in and first electrode and the second electrode of above-mentioned the first on-off element between, coiler part couples mutually with the positive pole of above-mentioned voltage stabilizing diode, after above-mentioned voltage stabilizing diode conducting, relay closes is so that above-mentioned input end sees through relay that above-mentioned output terminal is powered.
Preferably, above-mentioned contact part has one first stationary contact, one second stationary contact, one first moving contact and one second moving contact, the first stationary contact and the second stationary contact are respectively coupled to the first electrode and second electrode of the first on-off element, wherein, the first moving contact is corresponding to the first stationary contact, and second moving contact corresponding to the second stationary contact, after the voltage stabilizing diode conducting, the first moving contact and the first stationary contact phase adhesive, and the second moving contact and the second stationary contact phase adhesive are powered to output terminal thereby make input end see through relay.
Adopt rack-mounted server system of the present invention, by between power supply unit and a plurality of server, a soft starting circuit being set, come the time of the voltage rising of Control Server end, thereby can reduce the impact of the DC voltage that surge current exports power supply unit, and then the system of assurance reliability of operation, reduce maintenance cost.
Description of drawings
Fig. 1 illustrates the structured flowchart of rack-mounted server system according to an aspect of the present invention;
Fig. 2 illustrates the circuit diagram of a preferred embodiment of the soft starting circuit of the rack-mounted server system among Fig. 1; And
Fig. 3 illustrates the circuit diagram of another preferred embodiment of the soft starting circuit of the rack-mounted server system among Fig. 1.
Embodiment
Below will and describe clear explaination embodiments of the present invention in detail with accompanying drawing, for the purpose of simplifying accompanying drawing, some known habitual structures and assembly will illustrate in the mode of simple signal in the accompanying drawings.
Fig. 1 illustrates the structured flowchart of rack-mounted server system according to an aspect of the present invention.With reference to Fig. 1, this rack-mounted server system comprises power supply unit 200, a plurality of server (such as server 1, server 2, server 3 and server 4, but not as limit) and is arranged at soft starting circuit 100 between this power supply unit 200 and a plurality of server.
As previously mentioned, in existing server system, power supply unit 200 directly links to each other with a plurality of servers, the operating voltage so that these server normal operations to be provided.But, when part server moves, and when in addition part of server is opened suddenly, can in system, produce larger surge current, owing to there is no isolation between power supply unit 200 and these servers, then larger surge current can exert an influence to the DC voltage of power supply unit 200 outputs.For example, the voltage when server normally moves is 12V, is 10V or lower but the impact of surge current may cause the current lower voltage that is input to server.In view of this, the present invention has designed a kind of soft starting circuit, between power supply unit and a plurality of server, when realizing the voltage rising, also can reduce or eliminate surge current, and the stability of server system is provided.
Particularly, soft starting circuit 100 comprises: an input end 110, a constant-current source circuit 120, a biasing circuit 130, one first on-off element 140 and an output terminal 150.Wherein, input end 110 is coupled to one first DC voltage from power supply unit 200; Constant-current source circuit 120 is coupled to input end 110, in order to a steady current to be provided; Biasing circuit 130 is coupled to constant-current source circuit 120, in order to the bias voltage that a rising is provided and has a preset upper limit value; The first on-off element 140 is coupled to input end 110 and biasing circuit 130, drives the first on-off element 140 by bias voltage, makes it from cut-off state to the saturation conduction status transition; Output terminal 130 is coupled to the first on-off element 140, exports one second DC voltage when the first on-off element 140 saturation conduction.
Fig. 2 illustrates the circuit diagram of a preferred embodiment of the soft starting circuit of the rack-mounted server system among Fig. 1.As shown in Figure 2, the first on-off element (Q4) 140 is the P-channel field-effect transistor (PEFT) pipe, in the present embodiment, preferably, be P channel metal-oxide-semiconductor field, and be the field effect transistor of high-power low internal resistance, have one first electrode (source electrode), one second electrode (drain electrode) and one first control electrode (grid) it should be noted that, in the present embodiment, the first electrode can be source electrode, and the second electrode can be drain electrode, still, in some other embodiment, the first electrode can be drain electrode, and the second electrode can be source electrode, not as limit.The first electrode is coupled to input end 110, the second electrodes and couples mutually with output terminal 150, and the first control utmost point is coupled to biasing circuit 130.Input end 110 is coupled to one first DC voltage V1 from power supply unit 200.Constant-current source circuit 120 is made of the first diode D1, the second diode D2, second switch element Q1, the 3rd on-off element Q2, resistance R 1 and resistance R 2, and this constant-current source circuit 120 can be used to provide a steady current.Wherein, the first diode D1, its positive pole are coupled to input end 110, the second diode D2, and its positive pole is coupled to the negative pole of the first diode D1, in the present embodiment, and each step-down 0.7V behind DC voltage V1 process D1 and the D2.Second switch element Q1, have a third electrode (emitter), one the 4th electrode (collector) and one second control electrode (base stage), third electrode is coupled to the negative pole of the second diode D2, and the 4th electrode sees through the first resistance R 1 and is coupled to an earth terminal; The 3rd on-off element Q2, have one the 5th electrode (emitter), one the 6th electrode (collector) and one the 3rd control electrode (base stage), the 3rd control electrode couples the second control electrode, and the 5th electrode sees through one second resistance R 2 and is coupled to input end 110.It should be noted that, second switch element Q1 and the 3rd on-off element Q2 can be transistors, in the present embodiment, preferably, are the positive-negative-positive transistor, but not as limit.Biasing circuit 130 comprises: one first capacitor C 1, a voltage stabilizing diode WD1, one the 4th on-off element Q3, one the 3rd resistance R 3 and one the 4th resistance R 4.The first capacitor C 1, the one end is coupled to the 6th electrode, the other end is coupled to earth terminal, the first capacitor C 1, the steady current that can utilize constant-current source circuit 120 to provide charges to it, and then in its two ends formation certain voltage, namely utilizing the first capacitor C 1 that aforementioned bias voltage is provided, this bigoted voltage can be used for driving the first on-off element Q4; Voltage stabilizing diode WD1, its positive pole is coupled to earth terminal, negative pole is coupled to the 6th electrode, and when the voltage at the two ends of the first capacitor C 1 reaches preset upper limit value, then voltage stabilizing diode WD1 conducting, be reverse breakdown, this moment since the first capacitor C 1 by voltage stabilizing diode WD1 short circuit, so that constant-current source circuit 120 stops the charging of the first capacitor C 1; The 4th on-off element Q3, has one the 7th electrode (emitter), one the 8th electrode (collector) and one the 4th control electrode (base stage), the 4th control electrode and the first capacitor C 1 are coupled to a first node and couple with the 6th electrode, the 7th electrode sees through the 3rd resistance R 3 and is coupled to earth terminal, the 8th electrode and the first control electrode are coupled to a Section Point and see through the 4th resistance R 4 and be coupled to input end 110, in the present embodiment, the 4th on-off element Q3 can be transistor, preferably, be negative-positive-negative transistor, but not as limit.In this soft starting circuit, can also comprise one second capacitor C, 2, the second capacitor C 2 and be used for the filtering clutter signal, so that output terminal 150 output dc voltages.
Owing to charging with making between the first capacitor C 1 two ends to the first capacitor C 1, constant-current source circuit 120 forms certain voltage, its magnitude of voltage and rising, when the first capacitor C 1 both end voltage rises to certain value, the 4th on-off element Q3 conducting this moment, the Q3 conducting, then so that form certain electric current on the 3rd resistance R 3, thereby so that generation current on the 4th resistance R 4, and then the current potential at the first Section Point place of being connected with the 8th electrode of control electrode will reduce, thereby so that the first control electrode of the first on-off element Q4 and the first electrode form negative bias, and according to the characteristic of the first on-off element, when negative bias acquires a certain degree, when namely the current potential at the Section Point place that is connected with the 8th electrode of the first control electrode is reduced to certain value, to make the first on-off element Q4 begin conducting, when the first capacitor C 1 both end voltage continues to raise, when being elevated to certain value, voltage stabilizing diode WD1 conducting, because the first capacitor C 1 is by voltage stabilizing diode WD1 short circuit, 120 of constant-current source circuits stop 1 charging of the first capacitor C, and this moment, the first control electrode of the first on-off element Q4 and the first interelectrode voltage will be so that the first on-off element Q4 saturation conductions, thus so that output terminal 150 outputs one second DC voltage V2.In the present embodiment, because the first capacitor C 1 stops (the first on-off element Q4 saturation conduction) and needs the regular hour from just beginning to be charged to charging, namely, when input end 110 inputs the first DC voltage V1, output terminal 150 will just be exported the second DC voltage V2 behind certain hour, therefore, this soft starting circuit has certain time delay, and then has effectively avoided the adverse effect of surge current to server system.
Design parameter below in conjunction with each element describes scheme proposed by the invention and superiority thereof, in the present embodiment, the first DC voltage V1 is 12.5V, the first diode D1, the forward voltage drop of the second diode D2 is 0.7V, the burning voltage of voltage stabilizing diode is 5V, the capacitance of the first capacitor C 1 is 22 μ F, the resistance of the first resistance R 1 is 30K, the resistance of the second resistance R 2 is 3K, the resistance of the 3rd resistance R 3 is 20K, the resistance of the 4th resistance R 4 is 33K, the 4th control electrode (base stage) is 0.7V with the pressure drop of the 7th electrode (emitter) during the 4th on-off element Q3 conducting, the first on-off element Q4 is P channel metal-oxide-semiconductor field, and is the field effect transistor of high-power low internal resistance.As from the foregoing, constant-current source circuit 120 raises the first capacitor C 1 both end voltage Vc1 for 1 charging of the first capacitor C gradually, charging current I=1.4V/R2=1.4V/ (3K), behind the charging certain hour, when the first capacitor C 1 both end voltage Vc1 is 0.7V, the 4th on-off element Q3 begins conducting, thereby will form electric current on the 3rd resistance R 3, its size is (Vc1-0.7)/R3, and then the pressure drop of R4 is (Vc1-0.7) R4/R3, therefore the current potential at Section Point place is (Vin-(Vc1-0.7) R4/R3), therefore, the first control electrode of the first on-off element Q4 and the first interelectrode voltage is-(Vc1-0.7) R4/R3), namely as Vc1 during greater than 0.7V, be a negative pressure, so that form negative bias between the first control electrode and the first electrode.In the present embodiment, because the first on-off element Q4 is P channel metal-oxide-semiconductor field, and be the field effect transistor of high-power low internal resistance, according to its characteristic, when negative bias reaches certain value, to make the first on-off element Q4 begin conducting, when negative bias reaches another value, the first on-off element Q4 will enter saturation conduction, in the present embodiment, when Vc1 raise as 2V, the first on-off element Q4 began conducting, and when Vc1 raises as 5V, the first on-off element Q4 saturation conduction, and for making Vc1 reach 5V, then to the first capacitor C 1 required time T=(5V*C1)/I that charges, wherein, C1=22 μ F, I=1.4V/ (3K), hence one can see that, and T is about 240 milliseconds, and this time is far longer than surge current general duration.When the firm conducting of the first on-off element Q4, the output voltage V 2 of output terminal rises gradually, the voltage that namely offers server (such as Fig. 1) will rise gradually, when the first on-off element Q4 saturation conduction, the output voltage V 2 of output terminal preferably is the 12V DC voltage, and at this moment, load end is connected with power supply unit 200 (such as Fig. 1) by this low internal resistance of the first on-off element Q4, and at this moment, power supply unit 200 is by clean boot.
In the present embodiment, because the voltage V1 that power supply unit 200 provides, after this soft starting circuit of process carries out a fixed response time (duration of surge current is less than this time delay), power supply unit 200 provides voltage for server (load) by output terminal 150 again, by this, can overcome the impact that power supply unit 200 produces itself or server (load) because producing surge current.
It should be noted that, each component parameters in the above-mentioned soft starting circuit only is exemplary, but not as limit.
With reference to Fig. 3, Fig. 3 illustrates the circuit diagram of another preferred embodiment of the soft starting circuit of the rack-mounted server system among Fig. 1.Difference shown in Figure 3 and shown in Figure 2 only is that soft starting circuit also comprises: a relay (not indicating), and other parts are identical, therefore repeat no more.This relay is for the protection of the first on-off element Q4; it is described in detail in detail; power supply unit 200 (such as Fig. 1) is in order to provide required voltage and may cause the electric current of the first on-off element Q4 that flows through excessive for server (such as Fig. 1); may damage like this first on-off element Q4; therefore, in the present embodiment, add relay; can avoid said circumstances, concrete with reference to following narration.
As shown in Figure 3, relay has a coiler part 161 and a contact part 162, wherein contact part 162 is connected in parallel between the first electrode and the second electrode of the first on-off element Q4, coiler part 161 couples mutually with the positive pole of voltage stabilizing diode WD1, after voltage stabilizing diode WD1 conducting, relay closes is so that input end 110 sees through relay to output terminal 150 power supplies.
As shown in Figure 3, contact part 162 has one first stationary contact, one second stationary contact, one first moving contact and one second moving contact.The first stationary contact and the second stationary contact are respectively coupled to the first electrode and the second electrode of the first on-off element Q4, and, the first moving contact is corresponding to the first stationary contact, and second moving contact corresponding to the second stationary contact, after voltage stabilizing diode WD1 conducting, the first moving contact and the first stationary contact phase adhesive and the second moving contact and the second stationary contact phase adhesive are so that relay closes and so that input end 110 sees through relay to output terminal 150 power supplies namely provides required voltage to server.In addition, when voltage stabilizing diode WD1 conducting, this moment, the first on-off element Q4 was in saturation conduction, its internal resistance is very little, thereby so that the output voltage V 2 of output terminal 150 is relatively high, namely met the server required voltage, and because time-delay has overcome the impact that power supply unit 200 produces itself or server (load) because producing surge current, and relay closes at this moment, and so that the electric current of the first on-off element Q4 that flows through before all changes its course the relay of flowing through, thereby so that output terminal 150 is directly exported relatively High Level DC Voltage V2.And at this moment, the first on-off element Q4 is consumed power no longer, thereby so that whole power-efficient not therefore descend.
Adopt rack-mounted server system of the present invention, by between power supply unit and a plurality of server, a soft starting circuit being set, come the time of the voltage rising of Control Server end, thereby can reduce the impact of the DC voltage that surge current exports power supply unit, and then the system of assurance reliability of operation, reduce maintenance cost.
Above, describe the specific embodiment of the present invention with reference to the accompanying drawings.But those skilled in the art can understand, in the situation that without departing from the spirit and scope of the present invention, can also do various changes and replacement to the specific embodiment of the present invention.These changes and replacement all drop in claims limited range of the present invention.
Claims (9)
1. rack-mounted server system, comprise a power supply unit and a plurality of server, described power supply unit is used for providing normal operation required operating voltage to described a plurality of servers, it is characterized in that, also comprise a soft starting circuit, be coupled between described power supply unit and the described a plurality of server, have:
One input end is coupled to one first DC voltage from described power supply unit;
One constant-current source circuit is coupled to described input end, and a steady current is provided;
One biasing circuit is coupled to described constant-current source circuit, the bias voltage that a rising is provided and has a preset upper limit value;
One first on-off element, have one first electrode, one second electrode and one first control electrode, described the first electrode is coupled to described input end, described the first control electrode is coupled to described biasing circuit, drive described the first on-off element by described bias voltage, in order to make described the first on-off element from cut-off state to the saturation conduction status transition; And
One output terminal is coupled to described second electrode of described the first on-off element, exports one second DC voltage when described the first on-off element saturation conduction.
2. rack-mounted server system according to claim 1 is characterized in that, described the first on-off element is the P-channel field-effect transistor (PEFT) pipe.
3. rack-mounted server system according to claim 1 is characterized in that, described constant-current source circuit comprises:
One first diode, its positive pole is coupled to described input end;
One second diode, its positive pole is coupled to the negative pole of described the first diode;
One second switch element has a third electrode, one the 4th electrode and one second control electrode, and described third electrode is coupled to the negative pole of described the second diode, and described the 4th electrode sees through one first resistance and is coupled to an earth terminal; And
One the 3rd on-off element has one the 5th electrode, one the 6th electrode and one the 3rd control electrode, and described the 3rd control electrode couples described the second control electrode, and described the 5th electrode sees through one second resistance and is coupled to described input end.
4. rack-mounted server system according to claim 3 is characterized in that, described second switch element and described the 3rd on-off element are transistor.
5. rack-mounted server system according to claim 3 is characterized in that, described biasing circuit comprises:
One first electric capacity, one end are coupled to described the 6th electrode, and the other end is coupled to described earth terminal, and the described steady current that provides by described constant-current source circuit charges, so that described bias voltage to be provided; And
One voltage stabilizing diode, its positive pole is coupled to described earth terminal, and negative pole is coupled to described the 6th electrode, and when the bias voltage that loads on described the first electric capacity two ends reached described preset upper limit value, described voltage stabilizing diode conducting was so that described the first electric capacity stops charging.
6. rack-mounted server system according to claim 5 is characterized in that, described biasing circuit also comprises:
One the 4th on-off element, have one the 7th electrode, one the 8th electrode and one the 4th control electrode, described the 4th control electrode couples mutually with described the first electric capacity, described voltage stabilizing diode and described the 6th electrode, described the 7th electrode sees through one the 3rd resistance and is coupled to described earth terminal, and described the 8th electrode couples mutually and sees through one the 4th resistance and is coupled to described input end with described the first control electrode.
7. rack-mounted server system according to claim 6 is characterized in that, described soft starting circuit also comprises:
One second electric capacity, one end are coupled to described the second electrode, and the other end is coupled to described earth terminal.
8. rack-mounted server system according to claim 7 is characterized in that, described soft starting circuit also comprises:
One relay, have a contact part and a coiler part, described contact part be connected in parallel in and first electrode and the second electrode of described the first on-off element between, described coiler part couples mutually with the positive pole of described voltage stabilizing diode, after described voltage stabilizing diode conducting, described relay closes is so that described input end sees through described relay that described output terminal is powered.
9. rack-mounted server system according to claim 8, it is characterized in that, described contact part has one first stationary contact, one second stationary contact, one first moving contact and one second moving contact, described the first stationary contact and described the second stationary contact are respectively coupled to described the first electrode and described second electrode of described the first on-off element, wherein, described the first moving contact is corresponding to described the first stationary contact, and described the second moving contact is corresponding to described the second stationary contact
After described voltage stabilizing diode conducting, described the first moving contact and described the first stationary contact phase adhesive, and described the second moving contact and described the second stationary contact phase adhesive are powered to described output terminal thereby make described input end see through described relay.
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| WO2015196632A1 (en) * | 2014-06-24 | 2015-12-30 | 中兴通讯股份有限公司 | Method and circuit for suppressing surge current of direct current power source |
| CN105515363A (en) * | 2014-09-24 | 2016-04-20 | 原景科技股份有限公司 | Power supply circuit and soft starting circuit thereof |
| CN105515363B (en) * | 2014-09-24 | 2018-08-28 | 原景科技股份有限公司 | Power supply circuit and its soft starting circuit |
| CN109767715A (en) * | 2019-03-11 | 2019-05-17 | 京东方科技集团股份有限公司 | Soft-start circuit, integrated power supply management circuit and display equipment |
| CN112908750A (en) * | 2020-12-30 | 2021-06-04 | 深圳市劲阳电子有限公司 | Arc-extinguishing relay, arc-extinguishing device and arc-extinguishing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102955550B (en) | 2015-09-09 |
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