CN202145631U - Circuit of drive DC motor - Google Patents
Circuit of drive DC motor Download PDFInfo
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- CN202145631U CN202145631U CN201120238670U CN201120238670U CN202145631U CN 202145631 U CN202145631 U CN 202145631U CN 201120238670 U CN201120238670 U CN 201120238670U CN 201120238670 U CN201120238670 U CN 201120238670U CN 202145631 U CN202145631 U CN 202145631U
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Abstract
The utility model discloses a circuit of a drive DC (Direct Current) motor, which solves the problem in prior art that the motor emits heat and can be damaged when a positive power supply and a negative power supply are applied at the same time. The circuit comprises the DC motor (B1), a switch element (21), a relay unit (22) and a controller (23), wherein, a first series-connected branch is formed by the DC motor (B1) and the switch element (21); the relay unit (22) is connected with two ends of the first series-connected branch; the relay unit (22) can provide the positive power supply or the negative power supply to the first series-connected branch selectively; the controller (23) is used for controlling the switch element (21) and the relay unit (22); responding to first control signals (S1) sent from the controller (23), the switch element (21) is turned on or turned off, so that the DC motor (B1) is controlled to operate or stop; and responding to second control signals (S2) sent from the controller (23), the relay unit (22) is switched to the positive power supply or the negative power supply, so that the DC motor (B1) is controlled to rotate forwards or backwards.
Description
Technical field
The utility model relates to the Driving technique field of direct current machine, relates in particular to a kind of circuit that drives direct current machine.
Background technology
Drive the common employing H type bridge drive circuit or the integrated H bridge circuit of direct current machine in the market.As shown in Figure 1, its general operation principle is: switch S 1, S2, S3, S4 make switching tube be operated in the copped wave state, and wherein, S1, S4 are one group, and S2, S3 are another group, and two groups state is complementary, and then another group must shutoff in one group of conducting.Work as S1, during the S4 conducting, S2, S3 turn-offs, and the motor two ends add forward voltage, can realize the forward or reverse braking of motor; Work as S2, during the S3 conducting, S1, S4 turn-offs, and the motor two ends are reverse voltage, and the motor counter-rotating or the positive transformation of ownership are moving.Usually adopt the electronic component triode, the contact of FET or monostable relay replaces S1 as shown in Figure 1, S2, and S3, the S4 switch is formed the running that H bridge drive circuit comes drive motors.
But, in this scheme,, promptly there is the situation of positive rotaring signal or reverse signal simultaneously if receiving that interference possibly exist applies forward power supply or reverse electrical source simultaneously, cause the phenomenon that the motor feels hot damages.And; Prior art can need four group relay circuit or transistor circuit, FET circuit control DC motor; Not only cost is big on cost, the more important thing is that the energy consumption of driving four group relay circuit or transistor circuit, FET circuit is big.
Summary of the invention
In view of this, the utility model provides a kind of circuit that drives direct current machine, to solve in the prior art owing to disturb and cause the problem that the motor feels hot damages in the time of possibly applying forward power supply or reverse electrical source simultaneously.
Therefore, the utility model one embodiment provides a kind of circuit that drives direct current machine, and this circuit comprises:
One switch element of connecting with said direct current machine, said direct current machine and said switch element form first series arm; One relay unit that is connected with the said first series arm two ends, said relay unit can optionally provide forward power supply or the reverse electrical source opposite with said forward to said first series arm; One controller is used to control said switch element and said relay unit; Wherein, in response to first control signal from said controller, said switch element conducting or shutoff, thus control the operation of said direct current machine or stop; In response to second control signal from said controller, said relay unit switches to forward power supply or reverse electrical source, thereby controls said direct current machine forward or reverse.
Present embodiment utilizes relay unit control direct current machine to switch to forward power supply or reverse electrical source, and through conducting of controller control switch unit or shutoff, thereby controls said direct current machine operation or stop.Because the control of switch element can be controlled direct current machine at any time from running to halted state, need not as prior art, need apply reverse electrical source with the braking forward rotation.And; Can only corresponding forward power supply or reverse electrical source be provided to direct current machine by controller control relay unit at every turn; Therefore; Direct current machine can not be applied simultaneously forward power supply and reverse electrical source, has avoided direct current machine to produce simultaneously because of being interfered causing when applying the signal that just changes or change the problem of the motor feels hot damage elephant.
Preferable, said switch element is a FET and since FET can be at every turn can only a direction conducting, therefore select FET as switch element, can guarantee further that direct current machine is not applied simultaneously forward power supply and reverse electrical source.
Said switch element also further comprises photoelectrical coupler.Said photoelectrical coupler is used for to the switch element transfer control signal, and said controller and said FET are electrically isolated from one via said photoelectrical coupler simultaneously.
As a kind of execution mode, said relay unit can be connected to a positive power source terminal and a negative power end, and said relay unit can be monostable relay.Adopt monostable relay to form relay unit, cost is lower.
When adopting monostable relay, concrete, said relay unit can comprise first relay and second relay, and each relay is unicoil and has one group of transfer contact.Wherein the stiff end of the moving contact in the transfer contact group of first relay connects first end of first series arm, and the stiff end of the moving contact in the transfer contact of second relay connects second end of first series arm; Normally-closed contact in first relay and second relay transfer contact group separately is connected to negative power end, and its normally opened contact is connected to positive power source terminal; Wherein, In response to second control signal from said controller; Moving contact in the transfer contact group of first or second relay switches between normally-closed contact and normally opened contact; Wherein, two said moving contacts in said first relay and second relay can not switch to its normally opened contact separately simultaneously.
This scheme adopts two group relaies just can realize the driving of direct current machine with respect to prior art, and the quantity of the switch of use reduces, and reduces the consumption of energy greatly, and has reduced cost.
When adopting monostable relay, concrete, said relay unit can be one the 3rd relay, and said the 3rd relay is unicoil and has two groups of transfer contacts;
The stiff end of the moving contact of two groups of transfer contacts is connected respectively to the two ends of said first series arm, and the normally-closed contact in first group of transfer contact is connected negative power end with the normally opened contact in second group of transfer contact; Normally opened contact in first group of transfer contact is connected positive power source terminal with the normally-closed contact in second group of transfer contact; In response to second control signal of coming self-controller, two moving contacts in two groups of transfer contacts of the 3rd relay switch between each self-corresponding normally opened contact and normally-closed contact respectively.
This scheme adopts a relay (comprising a drive coil and two groups of transfer contacts) just can realize the driving that direct current machine just changes, reverses with respect to prior art, reduces the consumption of energy greatly, and has reduced cost.
In above-mentioned two embodiment, can further include: driver element, it is in response to the second control signal S2 that comes self-controller, for the drive coil in the relay of correspondence provides drive current.
Said driver element comprises: a triode of connecting with the drive coil of said relay and one and the drive coil diode connected in parallel of relay; Wherein the power end of diode cathode and drive coil all is connected to positive power source terminal; The anode of diode is connected to said triode; Wherein in response to said second control signal, said triode conducting makes the drive coil of said relay move because of getting electric its moving contact that drives.
As other a kind of embodiment, said relay unit can connect positive power source terminal and negative power end, and said relay unit is a bistable relay.When adopting bistable relay; Only need the pulse signal of certain width and amplitude just can make bistable relay stable be operated in Chang Kai or normally off, and keep this operating state and do not need to provide in addition and keep energy, therefore; Use bistable relay, can effective energy-saving.
Concrete, when adopting bistable relay, said relay unit comprises the 4th relay, the 4th relay has a 4 wheel driven moving winding and has two groups of transfer contacts; Wherein first group is connected the two ends of said first series arm respectively with the stiff end of the moving contact of second group of transfer contact, and the normally-closed contact in first group of transfer contact is connected negative power end with the normally opened contact in second group of transfer contact; Normally opened contact in first group of transfer contact is connected positive power source terminal with the normally-closed contact in second group of transfer contact; In response to second control signal of said self-controller, said 4 wheel driven moving winding gets electric, and the moving contact of two groups of transfer contacts switches between the normally opened contact of correspondence and normally-closed contact respectively.Wherein, this second control signal is a pulse signal.Preferably, when second control signal is the direct impulse signal, the set of 4 wheel driven moving winding, when second control signal was the negative-going pulse signal, the 4 wheel driven moving winding resetted.
Adopt this mode, can directly send pulse signal by controller and trigger the 4th relay, triggering mode is simple, and can save the energy.
Further; Said the 4th relay can comprise coil and resetting coil are set; In response to second control signal its effect of coil is set from said controller; In response to second control signal from said controller, said resetting coil works, and two groups of corresponding set of transfer contact or reset.
Description of drawings
Fig. 1 is prior art drive circuit of DC motor figure;
Fig. 2 is the utility model drive circuit of DC motor figure;
Fig. 3 adopts the circuit diagram of first embodiment of monostable relay for the utility model;
Fig. 4 adopts the circuit diagram of second embodiment of monostable relay for the utility model;
Fig. 5 adopts the circuit diagram of first embodiment of bistable relay for the utility model;
Fig. 6 adopts the circuit diagram of second embodiment of bistable relay for the utility model;
Fig. 7 utilizes the sketch map of positive negative pulse stuffing control bistable relay for the utility model embodiment;
Description of reference numerals:
21 switch elements;
22 relay units;
23 controllers;
The B1 direct current machine;
The U photoelectrical coupler
The Q1 FET;
K1～K4 first to fourth relay;
1CO～6CO relay transfer contact group;
1X2,1Y2,2X1,2Y1,3X1,3Y1, the normally-closed contact of relay transfer contact;
1X1,1Y1,2X2,2Y2,3X2,3Y2, the normally opened contact of relay transfer contact;
1X0,1Y0,2X0,2Y0,3X0,3Y0, the normally-closed contact of relay transfer contact;
C1～C5, the relay drive coil;
D1～D2 diode;
Q2～Q3 triode;
R1～R6 resistance;
S1 first control signal;
S21, S22, S2 second control signal.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, below lift embodiment to the utility model further explain.
In the present embodiment, utilize switch element and relay unit control direct current machine to switch to forward power supply or reverse electrical source, and by conducting of controller control switch unit or shutoff, thereby control said direct current machine operation or stop.
Referring to shown in Figure 2, a kind of circuit that drives direct current machine of the utility model comprises: a switch element 21 of connecting with direct current machine B1, and said direct current machine B1 and said switch element 21 form first series arm; With the relay unit 22 that the said first series arm two ends are connected, said relay unit 22 can optionally provide forward power supply or the reverse electrical source opposite with said forward to said first series arm; One controller 23 is used to control said switch element 21 and said relay unit 22.
Wherein, in structure shown in Figure 2, in response to the first control signal S1 from said controller 23, said switch element 21 conductings or shutoff, thus control said direct current machine B1 operation or stop; In response to the second control signal S2 from said controller 23, said relay unit 22 switches to forward power supply or reverse electrical source, thereby controls said direct current machine B1 forward or reverse.
In the present embodiment, through controlling switch unit, the direct current machine that can control running status at any time stops.Can only forward power supply or reverse electrical source be provided to direct current machine by controller 23 control relay unit 22 at every turn; Therefore; Direct current machine can not be applied simultaneously forward power supply and reverse electrical source, has avoided direct current machine possibly be interfered simultaneously producing causing when applying the signal that just changes or changes the problem of the motor feels hot damage elephant.
Concrete, wherein said switch element 21 can be FET Q1, specifically referring to Fig. 3-6.The characteristics of FET be when the voltage that applies (positive voltage, negative voltage) not simultaneously its drain electrode and source electrode can exchange use, and its characteristic remains unchanged basically.Thus, the characteristics of in the utility model, having utilized FET can two-way admittance work and at every turn can only a direction conducting are not applied simultaneously forward power supply and reverse electrical source further to guarantee direct current machine, realize motor just commentaries on classics, stop, reversing.
Further, can also comprise photoelectrical coupler U as the circuit that is used to drive FET Q1 in the switch element.This photoelectrical coupler U can be used for control signal S1 is delivered to the control end (that is, grid) of FET Q1, and said controller and said FET are electrically isolated from one via said photoelectrical coupler simultaneously.
Said relay unit 22 can be connected to a positive power source terminal and a negative power end.Particularly, relay unit 22 can be monostable relay, or is bistable relay.Adopt monostable relay to form relay unit, cost is lower, can save the energy and adopt bistable relay to form relay unit.Below will combine accompanying drawing 3-6 to specifically describe embodiments of the invention.
Embodiment one
Fig. 3 adopts the circuit diagram of first embodiment of monostable relay for the utility model;
Referring to shown in Figure 3, in the present embodiment, switch element 21 comprises FET Q1, photoelectrical coupler U; Relay unit 22 comprises two monostable relays, i.e. first relay K 1 and second relay K 2, and each relay is single drive coil (being called for short the single line district) and respectively has one group of transfer contact, like transfer contact group 1C0 or transfer contact group 2C0.
The stiff end of moving contact 1X0 among the transfer contact group 1C0 of first relay K 1 connects the first end A of first series arm, and the stiff end of the moving contact 1Y0 among the transfer contact group 2C0 of second relay K 2 connects the second end B of first series arm; Normally-closed contact 1X2,1Y2 in first relay K 1 and the second relay K 2 transfer contact group (1C0,2C0) separately all are connected to negative power end (for example, ground connection), and its normally opened contact 1X1,1Y1 separately all is connected to positive power source terminal (for example, Vcc).
Here; In response to second control signal S21 and the S22 from said controller 23; The transfer contact 1C0 of first relay or second relay, the moving contact of 2C0 switch between normally-closed contact 1X2,1Y2 and normally opened contact 1X1,1Y1, wherein, and under the controlling of second control signal; Two said moving contacts in said first relay and second relay can not switch to its normally opened contact separately, i.e. positive power source terminal simultaneously.
In Fig. 3, controller 23 sends the second control signal S2 and comprises control signal S21 and S22, and it controls first relay K 1 and second relay K 2 respectively.In example shown in Figure 3, each relay also preferably is equipped with driver element 30 or 31.As shown in Figure 3, driver element 30,31 comprise one with the drive coil C1 of relay, the controllable switch element that C2 connects, like triode Q2, Q3, and with drive coil C1, C2 diode connected in parallel D1 and D2.Wherein the negative electrode of diode is connected to positive power source terminal, and anode is connected to triode.
In Fig. 3; If coming the second control signal S21 of self-controller 23 is high level and the second control signal S22 is a low level; Then triode Q2 conducting; The coil C1 of first relay K 1 gets electric, and the moving contact among its transfer contact group 1C0 switches to normally opened contact 1X1 (promptly being connected to positive power source terminal Vcc) from normally-closed contact 1X2.Simultaneously, because control signal S22 is a low level, then triode Q3 ends, and the coil C2 of second relay K 2 does not work, and the moving contact among its transfer contact group 2C0 still is connected to its normally-closed contact 1Y2 (that is ground connection).Like this, the first end A of first series arm meets Vcc, and its second end B ground connection provides the forward power supply thereby relay unit 22 just is first series arm.If this moment, FET Q1 conducting in response to control signal S1, then direct current machine B1 will obtain clockwise forward drive current f
Orward, and just change therefrom.B1 just turns in the journey at motor, if controller 23 stops to apply first control signal, FET Q1 is turn-offed, and then direct current machine B1 is braked.Perhaps, during the coil C1 dead electricity of first relay, moving contact is when normally opened contact 1X1 switches to normally-closed contact 1X2 among the transfer contact 1C0, and direct current machine B1 also is braked.
Similarly; The second control signal S22 becomes high level if come the second control signal S21 of self-controller 23 to become low level; Then the coil C2 of second relay K 2 gets; Moving contact among its transfer contact 2C0 switches to normally opened contact 1Y1 (meeting Vcc) from normally-closed contact 1Y2, and the coil C1 of first relay K 1 resets because of dead electricity, and promptly its moving contact 1X0 gets back to normally-closed contact 1X2 (ground connection) from normally opened contact 1X1 switching.Like this, the first end A ground connection of first series arm, its second end B meets Vcc, thereby relay unit 22 just is first series arm reverse electrical source is provided.If this moment, FET Q1 conducting in response to control signal S1, then direct current machine B1 will obtain counterclockwise reverse drive electric current I
Reverse, direct current machine B1 counter-rotating.After this, if FET Q1 turn-offs, direct current machine B1 is braked.Perhaps, the moving contact of the second relay group transfer contact 2C0 is when normally opened contact 1Y1 switches to normally-closed contact 1Y2, and direct current machine B1 also is braked.
In addition, switch element 21 can further include photoelectrical coupler U.Photoelectrical coupler is used for the electrical isolation mode to FET Q1 transmission of control signals S1.Particularly; The anode of light-emitting diode connects the port of the controller 23 outputs first control signal S1 among the photoelectrical coupler U; The emitter of phototriode connects the grid of FET Q1 among the photoelectrical coupler U, and the grid of FET Q1 also connects the source electrode of FET Q1 through biasing resistor R3.So, when controller 23 provides one for example during the control signal S1 of high level, make among the photoelectrical coupler U light-emitting diode because of must conducting and luminous, corresponding phototriode conducting, and then impel FET Q1 conducting.Photoelectrical coupler U can also adopt the optocoupler of other types or other isolated component to realize for example small-sized magnetic coupling etc. according to actual needs.
Present embodiment makes the direct current machine forward, reverse or stop end through the transfer contact of two groups of monostable relays being controlled, changed the sense of current of direct current machine of flowing through.
Embodiment two
Fig. 4 shows the structure according to second embodiment of the utility model.In the present embodiment, switch element 21 is identical with switch element among the embodiment one, and the driver element 41 of relay is also identical with first embodiment, thereby repeats no more here.Different is that relay unit 22 comprises one the 3rd relay K 3, and said the 3rd relay K 3 has single drive coil but has two groups of transfer contact 3C0,4C0,
As shown in Figure 4; The first group of transfer contact 3C0 and the stiff end 2X0 of the moving contact of second group of transfer contact 4C0, ends A and the B that 2Y0 is connected said first series arm respectively, two normally opened contacts and normally-closed contact among each group transfer contact 3C0, the 4C0 are connected respectively to positive power source terminal (Vcc) and negative power end (for example).Wherein, the initial condition of the 3rd relay K 3 is for example for the normally-closed contact 2X1 of transfer contact group 3C0 is connected to ground, and the normally-closed contact 2Y1 of transfer contact group 4C0 is connected to Vcc.That is to say that the 3rd relay K 3 can provide the forward power supply to direct current machine B1 (being that control signal S2 is under the low level situation) under its stable state.At this moment, if in response to the first control signal S1 (high level), FET Q1 conducting, then relay K 3 can provide clockwise electric current I to direct current machine
ForwardThereby direct current machine B1 just changes.Certainly, the stable state of the 3rd relay K 3 also can oppositely be provided with as required, and promptly being arranged to provides reverse electrical source to direct current machine B1.
In Fig. 4; In response to the second control signal S2 (like high level) that comes self-controller 23, two groups of transfer contact 3C0 of the 3rd relay K 3, two moving contact 2X0 among the 4C0,2Y0 can switch between each self-corresponding normally opened contact 2X2,2Y2 and normally-closed contact 2X1,2Y1 respectively.For example; If the first control signal S2 (for example high level) in response to controller 23; The moving contact 2X0 of transfer contact group 3C0,4C0,2Y0 are from normally-closed contact 2X1,2Y1 switching band normally opened contact 2X2,2Y2 together; Thereby the first end A of first series arm is connected to ground, the Vcc that the second end B connects.At this moment, conducting then provides anticlockwise electric current I reverse to direct current machine if FET Q1 is in response to the first control signal S1, causes direct current machine B1 counter-rotating.When the second control signal S2 that comes self-controller 23 lost efficacy (low level), the coil C3 dead electricity of the 3rd relay K 3, two groups of transfer contact 3C0,4C0 reset to its initial stable state (state for example shown in Figure 4).
Though just change or Umklapp process in, if the first control signal S1 lost efficacy (becoming low level), then FET Q1 turn-offs, direct current machine B1 is braked.
Among the embodiment two, because relay unit 22 includes only a monostable relay, so cost is lower, and reliable.
Embodiment three
In the present embodiment, switch element 21 is identical with switch element among the embodiment one, different is connect positive power source terminal Vcc and negative power end GND () relay unit 22 be bistable relay.So-called bistable relay can move in response to the pulse signal of a certain given width and amplitude, and promptly the stable state of this relay can convert normal switching into from normally closed closure and closes, otherwise or.Therefore; When adopting bistable relay; Only need the pulse signal of certain width and amplitude just can make bistable relay stable be operated in Chang Kai or normally off, and keep this operating state and do not need to provide in addition and keep energy, therefore; Use bistable relay, can effective energy-saving.
Fig. 5 shows the structure according to an embodiment of the utility model.As shown in Figure 5, said relay unit 22 can comprise that the 4th relay K 4, the four relay K 4 have one the 4th coil C4 and have two groups of transfer contact 5C0,6C0.Wherein, the stiff end of the moving contact 3X0 of first group of transfer contact 5C0 and second group of transfer contact 6C0,3Y0 is connected the ends A and the B of said first series arm respectively.Here, the incipient stability attitude of the 4th relay K 4 is for example as shown in Figure 5.Just, among first group of transfer contact 5C0 among normally-closed contact 3X1 and the second group of transfer contact 6C0 normally opened contact 3X2 be connected negative power end (like ground); Among first group of transfer contact 5C0 among normally opened contact 3X2 and the second group of transfer contact 6C0 normally opened contact 3Y2 be connected positive power source terminal (Vcc).At this moment, if the second control signal S2 is invalid, then the 4th relay K 4 keeps state as shown in Figure 5, promptly to direct current machine the forward power supply is provided.In this case, if in response to the first control signal S1 of controller 23, FET Q1 conducting then provides clockwise forward current Iforward to direct current machine B1, thereby makes direct current machine B1 just change.
Afterwards; If the second control signal S2 (the for example rising edge of a pulse) in response to said self-controller 23; Said the 4th coil C4 forward powers up, and then the moving contact of two groups of transfer contact 5C0,6C0 together switches to separately normally opened contact 3X2,3Y2, and is stabilized under this state.At this moment, if in response to the first control signal S1 of controller 23, FET Q1 conducting, then the sense of current is counterclockwise, direct current machine B1 counter-rotating.Then, if the second control signal S2 becomes the trailing edge of a pulse, then the 4th relay K 4 returns to state as shown in Figure 5, and the forward power supply promptly is provided.
Fig. 7 shows the sketch map of bistable relay driving pulse and contact action.As shown in Figure 7, because the 4th relay K 4 is a bistable rel-ay, the second control signal S2 can be the pulse signal of certain width and amplitude.When the rising edge of this pulse was applied on the 4th coil C4, the moving contact of two groups of transfer contacts can switch to normally opened contact together from normally-closed contact, but also the state after can always keeping switching.When the trailing edge of pulse by the time was applied to the 4th coil C4, the moving contact of two groups of transfer contacts can switch to normally-closed contact from normally opened contact again together.Whenever apply a pulse as shown in Figure 7; Moving contact is just switched once, and in stable condition after switching, and the state of two groups of transfer contacts can not change because of the 4th coil losing electricity; Therefore can save mass energy, the energy that the 4th relay need not to continue is supplied with.
Embodiment four
Fig. 6 shows the structure of embodiment four.The difference of embodiment four and embodiment three is that bistable relay K 4 comprises coil C4 and resetting coil C5 are set.
With shown in Figure 5 different be coil C4 to be set and resetting coil C5 can move in response to the pulse of identical polar.Particularly, as shown in Figure 6, the negative pole end that coil C4 and resetting coil C5 are set is connected to public control end P1.1 together, and the positive terminal of two coils is connected respectively to control end P1.0 and P1.2.Public in this example control end P1.1 can be low always.So, when positive pulse occurring on the P1.0, coil C4 is set works, thereby the moving contact among transfer contact group 5C0 and the 6C0 switches to its normally opened contact (3X1 and 3Y1) together.When positive pulse occurring on the P1.2, resetting coil C5 works, thereby the moving contact among transfer contact group 5C0 and the 6C0 switches back its normally-closed contact (3X2 and 3Y2) from its normally opened contact (3X1 and 3Y1) together.So; The second control signal S2 that on control end P1.0, P1.1 and P1.2, sends in response to said controller 23; Coil is set and resetting coil C5 can work respectively, thereby impels two groups of transfer contact 5C0,6C0 set or reset, so that power supply forward or backwards to be provided.And, because the 4th relay is bistable rel-ay, its can be stabilized in set and reset after any state under, thereby need not other electric energy and keep its state, can save mass energy thus.
In above-mentioned four embodiment, each resistance R 1～R6 serial or parallel connection reaches the effect of pressure limiting or current limliting in the various piece one of circuit, is used for protective circuit.
The utility model utilizes the forward of optical coupler control FET and just commentaries on classics that reverse-conducting drives direct current machine, reverses and stops; And at every turn can only a kind of direction conducting; Effectively avoided owing to disturb maybe be simultaneously apply and just change and send out the signal that changes the damage that causes that the motor feels hot to motor.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
Claims (10)
1. a circuit that drives direct current machine is characterized in that, this circuit comprises:
One switch element (21) of connecting with said direct current machine (B1), said direct current machine (B1) and said switch element (21) form first series arm;
One relay unit (22) that is connected with the said first series arm two ends, said relay unit (22) can optionally provide forward power supply or the reverse electrical source opposite with said forward to said first series arm;
One controller (23) is used to control said switch element (21) and said relay unit (22);
Wherein, in response to first control signal (S1) from said controller (23), (21) conducting of said switch element or shutoff move or stop thereby controlling said direct current machine (B1); In response to second control signal (S2) from said controller (23), said relay unit (22) switches to forward power supply or reverse electrical source, thereby controls said direct current machine (B1) forward or reverse.
2. circuit as claimed in claim 1 is characterized in that, said switch element (21) is FET (Q1).
3. circuit as claimed in claim 2 is characterized in that, said switch element (21) also comprises photoelectrical coupler (U), and said controller provides said first control signal (S1) with electric isolation method to said FET (Q1) via said photoelectrical coupler (U).
4. circuit as claimed in claim 2 is characterized in that, said relay unit (22) is connected to a positive power source terminal and a negative power end, and said relay unit (22) is a monostable relay.
5. circuit as claimed in claim 4 is characterized in that, said relay unit (22) comprises first relay (K1) and second relay (K2), and each relay is unicoil and has one group of transfer contact (1C0,2C0),
The stiff end of the moving contact (1X0) in the transfer contact group (1C0) of first relay (K1) connects first end of first series arm, and the stiff end of the moving contact (1Y0) in the transfer contact group (2C0) of second relay (K2) connects second end of first series arm;
Separately transfer contact group of first relay and second relay (K1, K2) (1C0, (1X2 1Y2) is connected to negative power end to the normally-closed contact in 2C0), and its normally opened contact (1X1,1Y1) is connected to positive power source terminal;
Wherein, In response to second control signal (S2) from said controller (23); Transfer contact group (the 1C0 of first or second relay; Moving contact 2C0) switches between normally-closed contact (1X2,1Y2) and normally opened contact (1X1,1Y1), and wherein, two said moving contacts in said first relay and second relay can not switch to its normally opened contact separately simultaneously.
6. circuit as claimed in claim 4 is characterized in that, said relay unit (22) comprises one the 3rd relay (K3), and said the 3rd relay (K3) is for unicoil and have two groups of transfer contacts (3C0,4C0),
The stiff end of the moving contact (2X0,2Y0) in two transfer contact groups (3C0,4C0) connects the two ends of said first series arm respectively,
Normally-closed contact (2X1) in first group of transfer contact (3C0) is connected negative power end with normally opened contact (2Y2) in second group of transfer contact (4C0); Normally opened contact (2X2) in first group of transfer contact (3C0) is connected positive power source terminal with normally-closed contact (2Y1) in second group of transfer contact (4C0);
In response to second control signal (S2) of coming self-controller (23), two moving contacts (2X0,2Y0) in two transfer contact groups (3C0,4C0) of the 3rd relay (K3) switch between each self-corresponding normally opened contact (2X2,2Y2) and normally-closed contact (2X1,2Y1) respectively.
7. like claim 5 or 6 described circuit; It is characterized in that; Relay unit (22) also comprises driver element (30,31,40), and it is in response to second control signal (S2) of coming self-controller (23), to the drive coil (C1, C2, C3) of correspondence drive current is provided.
8. circuit as claimed in claim 2 is characterized in that, said relay unit (22) connects positive power source terminal and negative power end, and said relay unit (22) is a bistable relay.
9. circuit as claimed in claim 8 is characterized in that, said relay unit (22) comprises the 4th relay (K4), the 4th relay (K4) have one the 4th coil (C4) and have two groups of transfer contacts (5C0,6C0),
The stiff end of the moving contact of first group and second group of transfer contact (5C0,6C0) (3X0 3Y0) connects the two ends of said first series arm respectively,
Normally-closed contact (3X1) in first group of transfer contact (5C0) is connected negative power end with normally opened contact (3Y2) in second group of transfer contact (6C0); Normally opened contact (3X2) in first group of transfer contact (5C0) is connected positive power source terminal with normally-closed contact (3Y1) in second group of transfer contact (6C0);
In response to second control signal (S2) of said self-controller (23), the moving contact that said 4 wheel driven moving winding (C4) drives two groups of transfer contacts (5C0,6C0) switching between the normally opened contact (3X2,3Y2) of correspondence and normally-closed contact (3X1,3Y1).
10. circuit as claimed in claim 9 is characterized in that, said the 4th relay (K4) also further comprises resetting coil (C5),
In response to second control signal (S3) from said controller (23), said resetting coil (C5) drives two groups of transfer contacts, and (5C0 6C0) resets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120238670U CN202145631U (en) | 2011-07-07 | 2011-07-07 | Circuit of drive DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120238670U CN202145631U (en) | 2011-07-07 | 2011-07-07 | Circuit of drive DC motor |
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| Publication Number | Publication Date |
|---|---|
| CN202145631U true CN202145631U (en) | 2012-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120238670U Expired - Lifetime CN202145631U (en) | 2011-07-07 | 2011-07-07 | Circuit of drive DC motor |
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| CN (1) | CN202145631U (en) |
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- 2011-07-07 CN CN201120238670U patent/CN202145631U/en not_active Expired - Lifetime
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| CN107402158A (en) * | 2017-07-21 | 2017-11-28 | 中国科学院金属研究所 | Improve the reverse current method of direct current potential drop crack growth rate measurement accuracy |
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