Application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact
Technical field
The present invention relates to Low Voltage Electrical Apparatus, particularly relate to a kind of application special-shaped electric bridge and auxiliary contact, it is achieved efficiently save
" application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact " of electricity.
Background technology
A.C. contactor (Alternating Current Contactor) is a kind of application low tension widely
Device, ends 2015, and the A.C. contactor of China's on-line operation surpasses 1,000,000,000, and with the rate delivery of annual newly-increased 80,000,000
Increase.Its operation principle is to utilize electric magnet to drive movable contact (movable contact), makes normally-closed contact (normally
Closed contact) or normally opened contact (normally open contact) separate or close, reach to be switched off or on circuit
Purpose.It is applicable to start or control three phase induction motor and other electrical equipment.
Fig. 1 is the fundamental diagram of regular alternating current catalyst.The A.C. contactor of this routine is mainly by dynamic iron core, quiet ferrum
Core, magnet exciting coil, back-moving spring, movable contact, normally-closed contact, normally opened contact are formed.When magnet exciting coil connect AC220V,
During AC110V or AC380V voltage (being generally called AC220V, AC110V or AC380V below is AC voltage or field power supply), dynamic iron core
The effect of the magnetic force produced by magnet exciting coil and close with static iron core, the movable contact linked with dynamic iron core the most therewith with normally opened contact
Guan Bi, external circuit will pass through this normally opened contact and connects;When the AC voltage on magnet exciting coil disconnects, dynamic iron core loss of excitation is also subject to multiple
The position effect of spring and separate with static iron core, normally opened contact resets and disconnects, and external circuit is cut off the most therewith.
Fig. 2 is the scattergram of four groups of contacts of regular alternating current catalyst.In regular alternating current catalyst, " join with dynamic iron core
Dynamic contact " have four groups, wherein, main contacts 1, main contacts 2, main contacts 3 these three groups is for being used for switching on or off " three-phase electricity "
Main contacts, for " the auxiliary contact K " of " normally closed " or " normally opened ", (" the auxiliary contact K " of indication of the present invention is normally opened auxiliary to another group
Help contact) for the control of system.
It addition, " auxiliary normally closed interlock ", " auxiliary normally open contact " also can be added in A.C. contactor, " assists normally closed prolonging
Time contact ", " assisting normally opened time delay contact " for the control of complication system.
The work process of the A.C. contactor of this routine can be divided into " adhesive ", " sticking ", RESET three phases:
1, adhesive: magnet exciting coil and AC Voltage On state, dynamic and static iron core adhesive, main contacts 1, main contacts 2, main contacts 3, often
Open auxiliary contact K to close the most therewith.In this stage, the elastic force of inertia and back-moving spring for overcoming dynamic iron core, field power supply must
Must provide bigger power (hereinafter referred to as this power is " adhesive power "), dynamic and static iron core could be the most attracted.
2, sticking: magnet exciting coil continues and AC Voltage On state, dynamic and static iron core continues to keep the state of adhesive.In this stage,
Field power supply need only provide less power (hereinafter referred to as this power is " holding power "), and dynamic and static iron core also can continue adhesive.If
In this stage, field power supply provides excessive holding power, will result in waste of energy and causes unnecessary of A.C. contactor
Heat heats up;
3, resetting: magnet exciting coil disconnects AC voltage, dynamic and static iron core RESET separates, main contacts 1, main contacts 2, main contacts
3, normally opened auxiliary contact K resets disconnection the most therewith.
The purposes of A.C. contactor varies, and structure also varies, but their operation principle is all identical with Fig. 1.
Conventional A.C. contactor, owing to all passing to identical AC voltage in adhesive and sticking stage magnet exciting coil, is therefore deposited
Critical defect following:
1, meaningless power consumption: front already described, in adhesive and sticking stage, the most logical in the magnet exciting coil of conventional A.C. contactor
With " identical " AC voltage, make holding power excessive, cause meaningless electric energy loss;
2, heating: disastrous effect produced by meaningless electric energy loss is " heat up heating ", time serious, even can burn routine
The magnet exciting coil of A.C. contactor;
3, there is annoying AC noise;
For the present situation of prior art, the target that the present invention is to be reached is: " application electric technology is rebuild traditional industry ",
Design a kind of electronic circuit device the simplest, used try one's best few, performance exceed prior art, efficient electricity-saving " should
With the power-saving alternating-current catalyst of special-shaped electric bridge and auxiliary contact ".
Summary of the invention
A kind of power-saving alternating-current catalyst applying special-shaped electric bridge and auxiliary contact, including by movable contact MC, normally-closed contact NC,
The regular alternating current that normally opened contact NO, dynamic iron core M, static iron core G, back-moving spring F, magnet exciting coil L, normally opened auxiliary contact K are formed
Catalyst and 100 liang of parts of electronic unit, it is characterised in that: described electronic unit 100 is by control circuit 101, on-off circuit
102, special-shaped electric bridge and holding protection circuit 103 form;Described control circuit 101 is four port networks, has 2 ends, 3 ends, N
End, four ports of public E end;Described on-off circuit 102 is three-port network, has 4 ends, 5 ends, three ports of public E end;
Described special-shaped electric bridge and holding protection circuit 103 are five-port network, have 1 end, AC1 end, DC1 end, DC2 end, public E end
Five ports;Wherein: described public E end is all connected with the described B2 end of normally opened auxiliary contact K and the P2 end of AC voltage;
The N end of described control circuit 101 is connected with the B1 end of described normally opened auxiliary contact K, 2 ends and described special-shaped electric bridge and
1 end keeping protection circuit 103 is connected, 3 ends are connected with 4 ends of described on-off circuit 102;Described special-shaped electric bridge and
The AC1 end keeping protection circuit 103 is connected with the P1 end of AC voltage, DC1 end is connected with the A1 end of described magnet exciting coil L
Connect, DC2 end is all connected with 5 ends of the A2 end of described magnet exciting coil L and described on-off circuit 102.
Described electronic unit 100 and regular alternating current catalyst are combined by manner discussed above, can form this
" application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact " of bright indication.
Wherein: the A1 end of described magnet exciting coil L, A2 end can exchange port and connect;Described normally opened auxiliary contact K it
B1 end, B2 end can also exchange port and connect.
Described control circuit 101 can use multiple circuit structure, present invention employs following by 2 ends, 3 ends, N
End, public E end, the first electric capacity C1, the second electric capacity C2, the first resistance R1, the 4th diode D4, the 5th diode D5 are formed
Circuit, wherein: one end of the first electric capacity C1 is connected with 2 ends, the other end is connected with N end;The negative pole of the 5th diode D5, the four or two
The positive pole of pole pipe D4 is the most all connected with N end;The negative pole of the 4th diode D4, one end of the first resistance R1, the second electric capacity C2
Positive pole is all connected with 3 ends;The positive pole of the 5th diode D5, the other end of the first resistance R1, the second electric capacity C2 negative pole all with
Public E end is connected.
Described on-off circuit 102 can use multiple circuit structure, present invention employs following by 4 ends, 5 ends, public affairs
The circuit that E end, the 3rd diode D3, field effect transistor FET are formed altogether, wherein: the positive pole of the 3rd diode D3 and 5 ends are connected
Connect, negative pole is connected with the drain electrode of field effect transistor FET;Gate and 4 ends of field effect transistor FET are connected, source electrode and public E end phase
Connect.
Described special-shaped electric bridge and keep protection circuit 103 can use multiple circuit structure, below the present invention has selected
Four kinds of circuit:
(a), it is by the first diode D1, the second diode D2, the 3rd electric capacity C3, bilateral transient voltage suppression diode
TVS, AC1 end, DC1 end, DC2 end, 1 end and public E end composition, wherein: the positive pole of the first diode D1, the second diode D2
Negative pole is all connected with AC1 end;The negative pole of the first diode D1 is connected with DC1 end;The positive pole of the second diode D2 and DC2 end
It is connected;1 end is connected with DC1 end;One end of 3rd electric capacity C3 is connected with 1 end, the other end is connected with public E end;Double
Be connected with AC1 end to one end of transient voltage suppressor diode TVS, the other end is connected with public E end.
(b), it is by the first diode D1, the second diode D2, the 3rd electric capacity C3, bilateral transient voltage suppression diode
TVS, AC1 end, DC1 end, DC2 end, 1 end and public E end composition, wherein: the positive pole of the first diode D1, the second diode D2
Negative pole is all connected with AC1 end;The negative pole of the first diode D1 is connected with DC1 end;The positive pole DC2 end phase of the second diode D2
Connect;1 end is connected with DC2 end;One end of 3rd electric capacity C3 is connected with DC1 end, the other end is connected with public E end;Double
Be connected with AC1 end to one end of transient voltage suppressor diode TVS, the other end is connected with public E end.
(c), it is by the first diode D1, the second diode D2, the 3rd electric capacity C3, bilateral transient voltage suppression diode
TVS, AC1 end, DC1 end, DC2 end, 1 end and public E end composition, wherein: the positive pole of the first diode D1, the second diode D2
Negative pole is all connected with AC1 end;The negative pole of the first diode D1 is connected with DC1 end;The positive pole DC2 end phase of the second diode D2
Connect;1 end is connected with DC2 end;One end of 3rd electric capacity C3 is connected with 1 end, the other end is connected with public E end;Two-way
One end of transient voltage suppressor diode TVS is connected with AC1 end, the other end is connected with public E end.
(d), it is by the first diode D1, the second diode D2, the 3rd electric capacity C3, bilateral transient voltage suppression diode
TVS, AC1 end, DC1 end, DC2 end, 1 end and public E end composition, wherein: the positive pole of the first diode D1, the second diode D2
Negative pole is all connected with AC1 end;The negative pole of the first diode D1 is connected with DC1 end;The positive pole DC2 end phase of the second diode D2
Connect;1 end is connected with DC1 end;One end of 3rd electric capacity C3 is connected with DC2 end, the other end is connected with public E end;Double
Be connected with AC1 end to one end of transient voltage suppressor diode TVS, the other end is connected with public E end.
Described normally opened auxiliary contact K can prolong with other normal open switch such as catalyst auxiliary normally open contact, catalyst
Time auxiliary normally open contact substitute.
Described field effect transistor FET can be with other switching devices the most unidirectional thyratron transistor (Silicon
Controlled Rectifier, SCR), two-way thyratron transistor (Triode AC Switch, TRIAC), insulated gate bipolar
Transistor (Insulatend Gate Bipolar Transistor, IGBT), electron injection enhancement gate transistor
(Injection Enhanced Gate Tansistor, IEGT), SITH (Static Induction
Thyristor, SITH) or switch triode replacement.
The application present invention, can obtain following beneficial effect:
1, efficient electricity-saving:
In order to the efficient electric energy of the present invention is described, we have done following test:
(1) power consumption of regular alternating current catalyst, is first surveyed: the reputable brand LC1-of certain international famous company of state
D1810 type A.C. contactor: for 2.6W;
(2), survey by technical scheme again: above-mentioned LC1-D1810 type A.C. contactor adds the electronics list of the present invention
The power consumption of " application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact " of the indication of the present invention of unit 100 composition: for
0.2W;
Measured result shows, compared with international famous brand LC1-D1810 type A.C. contactor, the electric energy of the present invention can
Reach 92%.
2, quiet without making an uproar:
After nineteen twenty-four the first in the world A.C. contactor is born, AC noise and A.C. contactor are just " such as shade
With ", industry personnel has reached the stage of " customary, face the fearful with no fears " to the AC noise of regular alternating current catalyst.International
Famous brand LC1-D1810 type A.C. contactor also has the AC noise of audible when running, indication of the present invention " application special-shaped electric bridge and
The power-saving alternating-current catalyst of auxiliary contact " then quiet without audible noise when running.
3, low grade fever: the present invention has the function of efficient electricity-saving, has saved electric energy, certainty low grade fever during operation.
4, the electronic circuit of the electronic unit 100 of indication of the present invention is succinct, and element used is few, if making institute with surface mount elements
The PCB of the electronic unit 100 stated, then can be integrated into this PCB in A.C. contactor, makes integrated " the answering that outward appearance is tightly played
With the power-saving alternating-current catalyst of special-shaped electric bridge and auxiliary contact ".
5, the application present invention, can found the national brand that can challenge World Famous Brand completely with boosting national enterprise.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of regular alternating current catalyst;
Fig. 2 is the scattergram of four groups of contacts of regular alternating current catalyst;
Fig. 3 is the functional-block diagram of the present invention;
Fig. 4 is the circuit theory diagrams of embodiment 1;
Fig. 5 is the circuit theory diagrams of embodiment 2;
Fig. 6 is the circuit theory diagrams of embodiment 3;
Fig. 7 is the circuit theory diagrams of embodiment 4;
Fig. 8 a is AC voltage oscillogram;
Fig. 8 b is the oscillogram of the voltage Vg between the gate source electrode of field effect transistor FET.
Detailed description of the invention
Below in conjunction with the accompanying drawings, embodiments of the present invention are described.
Fig. 3 be the functional-block diagram of the present invention, Fig. 4 be the circuit theory diagrams of embodiment 1.In Fig. 3, Fig. 4: L is conventional friendship
Magnet exciting coil in stream catalyst, A1, A2 are its two connectivity ports;Switch k is normally opened auxiliary in regular alternating current catalyst
Helping contact K, B1, B2 are its two connectivity ports;Dashed rectangle 100 represents the electronic unit 100 of the present invention.
In conjunction with Fig. 1, Fig. 3, Fig. 4;A kind of power-saving alternating-current catalyst applying special-shaped electric bridge and auxiliary contact, touches including by dynamic
Point MC, normally-closed contact NC, normally opened contact NO, dynamic iron core M, static iron core G, back-moving spring F, magnet exciting coil L, normally opened auxiliary contact K
The regular alternating current catalyst formed and 100 liang of parts of electronic unit, it is characterised in that: described electronic unit 100 is by controlling
Circuit 101, on-off circuit 102, special-shaped electric bridge and holding protection circuit 103 form;Described control circuit 101 is four port nets
Network, has 2 ends, 3 ends, N end, four ports of public E end;Described on-off circuit 102 is three-port network, have 4 ends, 5 ends,
Three ports of public E end;Described special-shaped electric bridge and holding protection circuit 103 are five-port network, have 1 end, AC1 end, DC1
End, DC2 end, five ports of public E end;Wherein: described public E end is electric with the B2 end of described normally opened auxiliary contact K and AC
The P2 end of pressure is all connected;The N end of described control circuit 101 is connected with the B1 end of described normally opened auxiliary contact K, 2 ends
Be connected with 1 end of described special-shaped electric bridge and holding protection circuit 103,3 ends are connected with 4 ends of described on-off circuit 102
Connect;The AC1 end of described special-shaped electric bridge and holding protection circuit 103 is connected with the P1 end of AC voltage, DC1 end is encouraged with described
The A1 end of magnetic coil L is connected, DC2 end is homogeneous with 5 ends of the A2 end of described magnet exciting coil L and described on-off circuit 102
Connect.
Described electronic unit 100 and regular alternating current catalyst are combined by manner discussed above, can form this
" application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact " of bright indication.
Fig. 4 is the circuit theory diagrams of embodiment 1, in the present embodiment 1:
Control circuit 101 be by 2 ends, 3 ends, N end, public E end, the first electric capacity C1, the second electric capacity C2, the first resistance R1,
The circuit that 4th diode D4, the 5th diode D5 are formed, wherein: one end of the first electric capacity C1 is connected with 2 ends, the other end with
N end connects;The negative pole of the 5th diode D5, the positive pole of the 4th diode D4 are the most all connected with N end;4th diode D4's is negative
Pole, one end of the first resistance R1, the positive pole of the second electric capacity C2 are all connected with 3 ends;The positive pole of the 5th diode D5, the first resistance
The other end of R1, the negative pole of the second electric capacity C2 are all connected with public E end.
The circuit that on-off circuit 102 is made up of 4 ends, 5 ends, public E end, the 3rd diode D3, field effect transistor FET,
Wherein: positive pole and 5 ends of the 3rd diode D3 are connected, negative pole is connected with the drain electrode of field effect transistor FET;Field effect transistor FET
Gate and 4 ends are connected, source electrode is connected with public E end.
Special-shaped electric bridge and to keep protection circuit 103 be by the first diode D1, the second diode D2, the 3rd electric capacity C3, double
The circuit formed to transient voltage suppressor diode TVS, AC1 end, DC1 end, DC2 end, 1 end and public E end, wherein: first
The positive pole of diode D1, the negative pole of the second diode D2 are all connected with AC1 end;The negative pole of the first diode D1 and DC1 end phase
Connect;The positive pole of the second diode D2 is connected with DC2 end;1 end is connected with DC1 end;One end of 3rd electric capacity C3 and 1 end phase
Connect, the other end is connected with public E end;One end of bilateral transient voltage suppression diode TVS is connected with AC1 end, another
End is connected with public E end.
In above-mentioned special-shaped electric bridge and holding protection circuit 103:
First diode D1, the second diode D2 and magnet exciting coil L consist of " special-shaped electric bridge ", and it has a binomial function:
One, AC voltage commutation is the direct current of one-way flow by rectification;Its two, afterflow AC voltage close has no progeny, flow through excitation
The electric current i of coil L is through the first diode D1, the second diode D2 afterflow.
The first electric capacity C1 in 3rd electric capacity C3 Collaborative Control circuit 101, provides " holding power " for magnet exciting coil L.
Bilateral transient voltage suppression diode TVS is the protection device of the present invention, and it serves the outside " transient electrical of suppression
Pressure " effect.If the load of the transient voltage produced when being struck by lightning or A.C. contactor such as motor start-up, turn off time from
The transient voltage that induction electromotive force produces is scurried in the electronic unit 100 of the present invention, the described device example among electronic unit 100
As field effect transistor FET may breakdown damage.After arranging this transient voltage suppressor TVS, when " the transition that outside is scurried into
Voltage " magnitude of voltage higher than the breakdown voltage of described transient voltage suppressor TVS time, it is equivalent to short circuit, the present invention
Electronic unit 100 just protected.
Below in conjunction with the accompanying drawings, the work process of elaboration the present embodiment 1:
In conjunction with Fig. 4, in the present embodiment 1, the electric current i flowing through magnet exciting coil L is called exciting current i, flows through field effect transistor
The electric current i1 of FET is adhesive principal current i1.
In conjunction with Fig. 1, Fig. 4, Fig. 8 a, Fig. 8 b:
During t=t1, AC Voltage On state, it is along P1 AC1 end D1 DC1 end 1 end 2 end C1 N end
The path of D4 C2 public E end P2, to the second electric capacity C2 charging, the voltage at these the second electric capacity C2 two ends gradually rises.
During voltage Vg > Vt between the gate source electrode of i.e. field effect transistor FET of voltage at the second electric capacity C2 two ends, field
Effect pipe FET turns on.Above-mentioned Vt is the cut-in voltage of field effect transistor FET.
After the conducting of field effect transistor FET, P1 end be high level, P2 end be the low level positive half cycle of AC voltage, the main electricity of adhesive
Stream i1 is along P1 AC1 end D1 DC1 end A1 end magnet exciting coil L A2 end DC2 end 5 end D3 field effect transistor
The path circulation of FET public E end P2.
AC voltage is that described " application special-shaped electric bridge contacts with the power-saving alternating-current of auxiliary contact by adhesive principal current i1
Device " offer " adhesive power ".
Due to the flowing of adhesive principal current i1, magnet exciting coil L produces magnetic force and is called for short excitation, attracts dynamic iron core M towards quiet
Move in iron core G direction.
During t=t2, dynamic iron core M and static iron core G closes, described " application special-shaped electric bridge and the power-saving alternating-current of auxiliary contact
Catalyst " complete attracting process and enter sticking state.
In conjunction with Fig. 4, during t=t2, described " application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact " enters
After sticking state, with the normally opened auxiliary contact K Guan Bi of dynamic iron core M linkage, short circuit conducting between N end and public E end, AC voltage stops
Charging to the second electric capacity C2.
In t2~t3 time domain, the second electric capacity C2 is discharged by the first resistance R1, between the gate source electrode of field effect transistor FET
Voltage Vg gradually reduce, during to t=t3, Vg < Vt, field effect transistor FET turn off.
The time of present invention t2 to t3 is called " adhesive sticking Δ transit time t ".This Δ t is set and can bring following work
With:
1, the attracting state of " application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact " described in consolidation;
2, preventing because of " normally opened auxiliary contact K first closes ", " closing after dynamic iron core M and static iron core G " and the adhesive that causes are not
The generation of reliable phenomenon.
Field effect transistor FET is closed and is had no progeny, and AC voltage is by the electric current i2 on the first electric capacity C1 and the electricity flowing through the 3rd electric capacity C3
Stream i3 continues as described " application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact " offer " holding power ".
T3~t4 time domain, P1 end be low level, P2 end be the AC voltage negative half cycle of high level:
On first electric capacity C1, electric current i2 is along P2 public E end B2 end K B1 end N end C1 2 end 1 end
The path circulation of DC1 end A1 end magnet exciting coil L A2 end DC2 end D2 AC1 end P1;
On 3rd electric capacity C3, electric current i3 is along P2 public E end C3 1 end DC1 end A1 end magnet exciting coil L
The path circulation of A2 end DC2 end D2 AC1 end P1;
In this t3~t4 time domain, exciting current i is made up of electric current i2 and electric current i3 two part, and magnet exciting coil L is encouraged by this
The magnetic force (excitation) that magnetoelectricity stream i produces, makes described " application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact " firm
Ground sticking.
The personnel of this specialty will be apparent that the 3rd non-electric capacity that must set of electric capacity C3 system, and the small-sized exchange for Fig. 1 indication connects
Tentaculum, this 3rd electric capacity C3 can omit, and only relies on the electric current i2 on the first electric capacity C1, described " application special-shaped electric bridge and auxiliary
Help the power-saving alternating-current catalyst of contact " can firmly sticking.
During t=t4, AC voltage turns off, described " application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact " power-off
Reset.
During t=t5, AC voltage is once again powered up, described " application special-shaped electric bridge and the power-saving alternating-current catalyst of auxiliary contact "
It is again introduced in the working cycle of " adhesive ", " sticking ", RESET.
According to above elaboration, in conjunction with Fig. 4, the personnel of this specialty will be apparent that
Described normally opened auxiliary contact K can prolong with other normal open switch such as catalyst auxiliary normally open contact, catalyst
Time auxiliary normally open contact substitute.
Described field effect transistor FET can with the most unidirectional thyratron transistor of other switching devices, two-way thyratron transistor,
Insulated gate bipolar transistor, electron injection enhancement gate transistor, SITH or switch triode replace.
Fig. 5 is the circuit theory diagrams of embodiment 2, the control circuit 101 of the present embodiment 2, on-off circuit 102 and embodiment 1
Identical, but special-shaped electric bridge and holding protection circuit 103 differ with embodiment 1, and it is by the first diode D1, the second diode
D2, the 3rd electric capacity C3, bilateral transient voltage suppression diode TVS, AC1 end, DC1 end, DC2 end, 1 end and public E end composition, its
In: the positive pole of the first diode D1, the negative pole of the second diode D2 are all connected with AC1 end;The negative pole of the first diode D1 with
DC1 end is connected;The positive pole DC2 end of the second diode D2 is connected;1 end is connected with DC2 end;One end of 3rd electric capacity C3 with
DC1 end is connected, the other end is connected with public E end;One end of bilateral transient voltage suppression diode TVS is connected with AC1 end
Connect, the other end is connected with public E end.
The operation principle of the present embodiment 2, work process are similar to Example 1.
Fig. 6 is the circuit theory diagrams of embodiment 3, the control circuit 101 of the present embodiment 3, on-off circuit 102 and embodiment 1
Identical, but special-shaped electric bridge and holding protection circuit 103 differ with embodiment 1, and it is by the first diode D1, the second diode
D2, the 3rd electric capacity C3, bilateral transient voltage suppression diode TVS, AC1 end, DC1 end, DC2 end, 1 end and public E end composition, its
In: the positive pole of the first diode D1, the negative pole of the second diode D2 are all connected with AC1 end;The negative pole of the first diode D1 with
DC1 end is connected;The positive pole DC2 end of the second diode D2 is connected;1 end is connected with DC2 end;One end of 3rd electric capacity C3 with
1 end is connected, the other end is connected with public E end;One end of bilateral transient voltage suppression diode TVS is connected with AC1 end,
The other end is connected with public E end.
The operation principle of the present embodiment 3, work process are similar to Example 1.
Fig. 7 is the circuit theory diagrams of embodiment 4, the control circuit 101 of the present embodiment 4, on-off circuit 102 and embodiment 1
Identical, but special-shaped electric bridge and holding protection circuit 103 differ with embodiment 1, and it is by the first diode D1, the second diode
D2, the 3rd electric capacity C3, bilateral transient voltage suppression diode TVS, AC1 end, DC1 end, DC2 end, 1 end and public E end composition, its
In: the positive pole of the first diode D1, the negative pole of the second diode D2 are all connected with AC1 end;The negative pole of the first diode D1 with
DC1 end is connected;The positive pole DC2 end of the second diode D2 is connected;1 end is connected with DC1 end;One end of 3rd electric capacity C3 with
DC2 end is connected, the other end is connected with public E end;One end of bilateral transient voltage suppression diode TVS is connected with AC1 end
Connect, the other end is connected with public E end.
The operation principle of the present embodiment 4, work process are similar to Example 1.
Above describing technical scheme, all are without departing from the replacement of the essence of technical scheme, all
Should be in the range of the claim of the present invention.