CN202444454U - Control circuit of direct current motor - Google Patents
Control circuit of direct current motor Download PDFInfo
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- CN202444454U CN202444454U CN2012200594203U CN201220059420U CN202444454U CN 202444454 U CN202444454 U CN 202444454U CN 2012200594203 U CN2012200594203 U CN 2012200594203U CN 201220059420 U CN201220059420 U CN 201220059420U CN 202444454 U CN202444454 U CN 202444454U
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- 238000001514 detection method Methods 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 229910001006 Constantan Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- Control Of Direct Current Motors (AREA)
Abstract
The utility model discloses a direct current motor's control circuit. The control circuit of the direct current motor comprises: the alternating current input end of the first rectifying unit is connected with a power supply through a power supply line; the switch unit is arranged on a live wire or a zero wire of a power supply circuit; the double-contact relay is connected between the direct current output end of the first rectifying unit and the direct current motor; the detection unit is arranged on a live wire or a zero wire of the power supply circuit and used for detecting whether the switch unit is closed or not; and the control unit is connected with the switch unit, the control coil of the double-contact relay and the detection unit, and is used for controlling the double-contact relay to be closed when the detection unit detects that the switch unit is disconnected, and controlling the switch unit to be closed after the preset time after the double-contact relay is closed. Through the utility model discloses, the problem that there is electrical safety hidden danger and takes place the short circuit easily in the control circuit who has solved DC motor among the prior art, and then has reached the effect that improves DC motor operation security.
Description
Technical field
The utility model relates to circuit field, in particular to a kind of control of DC circuit.
Background technology
In the prior art, control DC motor positive and negative rotation through using a switching device of often opening and a double-contact normally closed relay to connect.Power supply is through behind the switching device; Both positive and negative polarity connects two common port contacts of double-contact normally closed relay respectively; First group normally opened contact of one end of direct current machine and double-contact normally closed relay is connected with second group normally-closed contact; The normally opened contact of the other end of motor and second group of double-contact normally closed relay is connected with first group normally-closed contact, and concrete winding diagram is as shown in Figure 1.
When the needs motor is just changeing, the control switch break-over of device, electric current is that motor provides power supply through two normally-closed contacts of relay, motor just changes.
When the needs motor reverses, the control switch break-over of device, the common port contact of relay is connected with normally opened contact through plug-in strip, the relay conducting, electric current is that motor provides power supply through two normally opened contacts of relay, the motor counter-rotating.
But this kind of available technology adopting circuit carries out the control mode of DC motor positive and negative rotation, the make-and-break time of switching device and relay is not controlled, when the counter-rotating of control motor; If switching device is prior to relay closes, then relay has forceful electric power, can produce the arcing phenomenon in closed moment; There is electrical safety hidden danger, and, if two groups of contacts are not closed simultaneously during the actuating of relay; Have one group of contact closed earlier, another group contact is not closed, then can be short-circuited.
Problem to there is electrical safety hidden danger in control of DC circuit in the correlation technique and is short-circuited does not easily propose effective solution at present as yet.
The utility model content
The main purpose of the utility model is to provide a kind of control of DC circuit, to solve the problem that there is electrical safety hidden danger in the control of DC circuit and is short-circuited easily in the correlation technique.
To achieve these goals,, a kind of control of DC circuit is provided, has comprised according to the utility model: first rectification unit, wherein, the ac input end of first rectification unit is connected with power supply through supply line; Switch element is arranged on the live wire or zero line of supply line; Double-contact relay is connected between the dc output end and direct current machine of first rectification unit; Detecting unit is arranged on the live wire or zero line of supply line, and whether be used for the sense switch unit closed; And control unit; All be connected with detecting unit with the control coil of switch element, double-contact relay; Be used for control double-contact relay closure when detection is broken off to switch element, and control switch unit is closed behind the Preset Time after the double-contact relay closure.
Further, the common port contact of double-contact relay is connected with the dc output end of first rectification unit.
Further, the common port contact of double-contact relay is connected with direct current machine.
Further, switch element is the single contact relay, and wherein, the control coil of single contact relay is connected with control unit.
Further, control circuit also comprises: first drive circuit is connected between the control coil and control unit of single contact relay; And second drive circuit, be connected between the control coil and control unit of double-contact relay.
Further, first drive circuit comprises: the first transistor, first resistance and second resistance, wherein; First end of the first transistor is connected with first end of first resistance, and second end of first resistance is connected with control unit, and second end of the first transistor is connected with the control coil of single contact relay; The 3rd end ground connection of the first transistor, first end of second resistance is connected first node, the second end ground connection of second resistance; First node is the node between first end of first end and first resistance of the first transistor; Second drive circuit comprises: transistor seconds, the 3rd resistance and the 4th resistance, and wherein, first end of transistor seconds is connected with first end of the 3rd resistance; Second end of the 3rd resistance is connected with control unit; Second end of transistor seconds is connected with the control coil of double-contact relay, the 3rd end ground connection of transistor seconds, and first end of the 4th resistance is connected Section Point; The second end ground connection of the 4th resistance, Section Point are the node between first end of first end and the 3rd resistance of transistor seconds.
Further; Detection means comprises current transformer, modular type Hall current sensor, light-coupled isolation amplifier, condenser type isolated amplifier or sigma delta formula isolated amplifier; Detection means can also be made up of the current detection circuit that detection resistance and operational amplifier are formed; Utilize the detection shunt resistance to detect, like the constantan wire detection method.
Further; When detection means is a current transformer; When the primary coil of current transformer was arranged on live wire or the zero line of supply line, control circuit also comprised: second rectification unit, wherein; The ac input end of second rectification unit is connected with the secondary coil of current transformer, and the dc output end of second rectification unit is connected with control unit.
Further, control circuit also comprises: filter unit is connected between the dc output end of the control unit and second rectification unit; And divider resistance, be connected between the dc output end of the filter unit and second rectification unit.
Through the utility model, adopt the circuit that comprises following structure: first rectification unit, wherein, the ac input end of first rectification unit is connected with power supply through supply line; Switch element is arranged on the live wire or zero line of supply line; Double-contact relay is connected between the dc output end and direct current machine of first rectification unit; Detecting unit is arranged on the live wire or zero line of supply line, and whether be used for the sense switch unit closed; And control unit; All be connected with detecting unit with the control coil of switch element, double-contact relay; It is closed to be used for when detection is broken off to switch element the control double-contact relay, and control switch unit is closed behind the Preset Time after the double-contact relay closure, through on first rectification unit and circuit that power supply is connected, detecting unit being set; The closure that control unit can be judged switch element according to the test result of this detecting unit whether; To guarantee control unit after the adequate closure of control double-contact relay, control switch unit is closed again, has avoided electrical safety hidden danger and short circuit; Solve the problem that there is electrical safety hidden danger in the control of DC circuit and is short-circuited easily in the prior art, and then reached the effect that improves direct current machine running fail safe.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide the further understanding to the utility model, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the control circuit of correlation technique;
Fig. 2 is the sketch map according to the control circuit of the utility model first embodiment;
Fig. 3 is the sketch map according to the control circuit of the utility model second embodiment;
Fig. 4 is the schematic diagram according to the control circuit of the utility model first preferred embodiment;
Fig. 5 is the schematic diagram according to the control circuit of the utility model second preferred embodiment; And
Fig. 6 is the flow chart according to the control method of the utility model embodiment.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the utility model.
Fig. 2 is the sketch map according to the control circuit of the utility model first embodiment; As shown in Figure 2, the control circuit of the utility model first embodiment comprises switch element, first rectification unit, detecting unit, double-contact relay and control unit (not shown).
Particularly, the ac input end of first rectification unit is connected with power supply through supply line; Switch element is arranged on the live wire or zero line of supply line; The common port contact of double-contact relay is connected with the dc output end of first rectification unit, and normally opened contact is connected with direct current machine with normally-closed contact, and control coil is connected with control unit; Detecting unit is arranged on the live wire or zero line of supply line, and whether be used for the sense switch unit closed; Control unit all is connected with detecting unit with switch element.
The operation principle of the control circuit of the utility model first embodiment is: power supply is through the first rectifier power source rectification; DC power supply both positive and negative polarity after the rectification connects two common port contacts of double-contact normally closed relay respectively; First group normally opened contact of one end of direct current machine and double-contact normally closed relay is connected with second group normally-closed contact, and the normally opened contact of the other end of direct current machine and second group of double-contact normally closed relay is connected with first group normally-closed contact.Wherein, the flow process of control direct current machine running is as shown in Figure 6, comprising: S602, and whether the switch element that detects control circuit is closed; And S604, the double-contact relay of control control circuit is closed when switch element breaks off, and control switch unit is closed behind the Preset Time after the double-contact relay closure; Particularly; Suppose to be in when just changeing state when direct current machine, the common port contact of double-contact relay is connected with normally-closed contact, and (just subcontracting and drawing together: starting just changes after transferring startup to when the needs motor just changes; Inverted status transfers to just changes state) time; Control unit when switch element breaks off earlier the plug-in strip of control double-contact normally closed relay close on two normally-closed contacts, then after after a while, control unit control switch unit closure; Electric current is that motor provides power supply through two normally-closed contacts of double-contact normally closed relay, and this moment, direct current machine just changeed; When the needs motor reverses (counter-rotating comprises: reverse after startup transfers startup to, just the commentaries on classics state transfers inverted status to), at first whether detect by the closure of detecting unit to switch element; Whether control unit can judge the switch element closure according to the output result of detecting unit; When detecting the switch element disconnection, the action of control unit control double-contact normally closed relay is again after a period of time time-delay; This section period gives double-contact normally closed relay adequate time closed fully; So that its plug-in strip closes on two normally opened contacts, afterwards, the control unit control switch unit is closed; Electric current is that motor provides power supply through two normally opened contacts of double-contact normally closed relay, direct current machine counter-rotating this moment.
Control unit among the utility model first embodiment can be single-chip microcomputer, and wherein, the control coil of switch element, double-contact relay and detecting unit are connected respectively on 3 I/O of single-chip microcomputer.
Through elder generation's sense switch unit closure when the needs motor reverses whether, closed with control double-contact relay when switch element breaks off, wait the double-contact relay closure after, control switch unit closure again.Effectively prevent the short circuit phenomenon that arcing phenomenon that switch element produces in closed moment prior to the double-contact relay closed double-contact relay that is caused and double-contact produce when successively closed, reached the effect that improves direct current machine running fail safe.
Fig. 3 is the sketch map according to the control circuit of the utility model second embodiment; Compare with the control circuit of the utility model first embodiment; The two difference is; The common port contact of double-contact relay is connected with direct current machine in the control circuit of the utility model second embodiment, and the operation principle of control circuit is identical with the operation principle of the control circuit of the utility model first embodiment.
The control circuit of the utility model second embodiment is except the effect of the control circuit that can reach first embodiment; Can also effectively avoid as relay R LY2 because there is a contact to damage; Cause a plug-in strip of double-contact relay close at first group often open (normally closed) contact; The short circuit problem that the another one plug-in strip is brought when closing at normally closed (often opening) contact of second group has reached the effect that improves direct current machine running fail safe better.
Fig. 4 is the schematic diagram according to the control circuit of the utility model first preferred embodiment; As shown in Figure 4; The control circuit of the utility model first preferred embodiment is compared with the control circuit of the utility model first embodiment; The two difference is that switch element is single contact relay R LY1 in the utility model first preferred embodiment, and the control coil of single contact relay R LY1 is connected with control unit; Detecting unit is a current transformer, and the control circuit of the utility model first preferred embodiment also comprises: first driver element, second driver element and second rectification unit.
Wherein, Detecting unit can also be in modular type Hall current sensor, light-coupled isolation amplifier, condenser type isolated amplifier or the sigma delta formula isolated amplifier any one; Detecting unit can also be made up of the current detection circuit that detection resistance and operational amplifier are formed; Utilize the detection shunt resistance to detect, like the constantan wire detection method.
Particularly; With the detecting unit is that current transformer is illustrated; The primary coil of current transformer is arranged on live wire or the zero line; Secondary coil is connected with the ac input end of second rectification unit, and first driver element is made up of the first transistor Q1, first resistance R 1 and second resistance R 2, and second driver element is made up of transistor seconds Q2, the 3rd resistance R 3 and the 4th resistance R 4; Second rectification unit is the rectifier bridge of being made up of four diodes (the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4); After single contact relay R LY1 closure, current transformer produces induced current, and control unit produces electric current according to current transformer and whether whether judges single contact relay R LY1 closure.
When the needs motor is just changeing, control unit control triode Q1 conducting, relay R LY1 is closed, and the two normally-closed contacts through relay R LY2 after the rectification of electric current process rectifier bridge are that motor provides power supply, and motor just changes.When the needs motor reversed, at first detecting the current transformer output by control unit had no current, is zero like electric current; Be not conducting of RLY1, then by control unit control triode Q2 conducting, relay R LY2 is closed; After the software set time-delay, control triode Q1 conducting by control unit again; Relay R LY1 is closed, and the two normally opened contacts through relay R LY2 after the rectification of electric current process rectifier bridge are that motor provides power supply, the motor counter-rotating.Effectively prevent the short circuit phenomenon that arcing phenomenon that switch element produces in closed moment prior to relay that relay closes caused and double-contact produce when successively closed, reached the effect that improves direct current machine running fail safe.
Fig. 5 is the schematic diagram according to the control circuit of the utility model second preferred embodiment; As shown in Figure 5; The control circuit of the utility model second preferred embodiment is compared with the control circuit of the utility model first preferred embodiment, and the two difference is, in the utility model second preferred embodiment; The common port contact of double-contact relay is connected with direct current machine, and the control circuit of the utility model second preferred embodiment also comprises: filter unit and divider resistance R5.
Particularly, filter unit is made up of resistance R 6 and capacitor C parallel connection, is connected with the dc output end of second rectification unit through divider resistance R5.The operation principle of the control circuit control DC motor positive and negative rotation of the utility model second preferred embodiment is identical with the control principle of the utility model first preferred embodiment.Through increasing divider resistance R5, with the voltage that guarantees to get into single-chip microcomputer in the operating voltage range of single-chip microcomputer, in case overtension burns out single-chip microcomputer; Filter circuit can the filtering rectification circuit in ripple in the output voltage, the output voltage ripple coefficient is reduced, it is smoother that waveform becomes.
The control circuit of the utility model second preferred embodiment is except the effect of the control circuit that can reach first preferred embodiment; Can also effectively avoid as relay R LY2 because there is a contact to damage; Cause a plug-in strip of double-contact relay close at first group often open (normally closed) contact; The short circuit problem that the another one plug-in strip is brought when closing at normally closed (often opening) contact of second group has reached the effect that improves direct current machine running fail safe better.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. a control of DC circuit is characterized in that, comprising:
First rectification unit, wherein, the ac input end of said first rectification unit is connected with power supply through supply line;
Switch element is arranged on the live wire or zero line of said supply line;
Double-contact relay is connected between the dc output end and direct current machine of said first rectification unit;
Detecting unit is arranged on the live wire or zero line of said supply line, and whether be used to detect said switch element closed; And
Control unit; All be connected with said detecting unit with the control coil of said switch element, said double-contact relay; It is closed to be used for when said switch element breaks off, controlling said double-contact relay in said detection, and the said switch element of control is closed behind the Preset Time after the said double-contact relay closure.
2. control circuit according to claim 1 is characterized in that, the common port contact of said double-contact relay is connected with the dc output end of said first rectification unit.
3. control circuit according to claim 1 is characterized in that, the common port contact of said double-contact relay is connected with said direct current machine.
4. according to claim 2 or 3 described control circuits, it is characterized in that said switch element is the single contact relay, wherein, the control coil of said single contact relay is connected with said control unit.
5. control circuit according to claim 4 is characterized in that, said control circuit also comprises:
First drive circuit is connected between the control coil and said control unit of said single contact relay; And
Second drive circuit is connected between the control coil and said control unit of said double-contact relay.
6. control circuit according to claim 5 is characterized in that,
Said first drive circuit comprises: the first transistor (Q1), first resistance (R1) and second resistance (R2); Wherein, First end of said the first transistor (Q1) is connected with first end of said first resistance (R1); Second end of said first resistance (R1) is connected with said control unit, and second end of said the first transistor (Q1) is connected with the control coil of said single contact relay, the 3rd end ground connection of said the first transistor (Q1); First end of said second resistance (R2) is connected first node; The second end ground connection of said second resistance (R2), said first node are the node between first end of first end and said first resistance (R1) of said the first transistor (Q1)
Said second drive circuit comprises: transistor seconds (Q2), the 3rd resistance (R3) and the 4th resistance (R4); Wherein, First end of said transistor seconds (Q2) is connected with first end of said the 3rd resistance (R3); Second end of said the 3rd resistance (R3) is connected with said control unit; Second end of said transistor seconds (Q2) is connected with the control coil of said double-contact relay, the 3rd end ground connection of said transistor seconds (Q2), and first end of said the 4th resistance (R4) is connected Section Point; The second end ground connection of said the 4th resistance (R4), said Section Point are the node between first end of first end and said the 3rd resistance (R3) of said transistor seconds (Q2).
7. control circuit according to claim 1 is characterized in that, said detecting unit comprises: current transformer, the primary coil of said current transformer are arranged on the live wire or zero line of said supply line.
8. control circuit according to claim 7 is characterized in that, said detecting unit also comprises:
Second rectification unit, wherein, the ac input end of said second rectification unit is connected with the secondary coil of said current transformer, and the dc output end of said second rectification unit is connected with said control unit.
9. control circuit according to claim 8 is characterized in that, said control circuit also comprises:
Filter unit is connected between the dc output end of said control unit and said second rectification unit; And
Divider resistance is connected between the dc output end of said filter unit and said second rectification unit.
10. control circuit according to claim 8 is characterized in that, said second rectification unit comprises:
First diode (D1), negative electrode is connected with said controller;
Second diode (D2), negative electrode is connected with said controller;
The 3rd diode (D3), plus earth connects; And
The 4th diode (D4), plus earth connects,
Wherein, Said first diode (D1) is connected with said the 3rd diode (D3); Said second diode (D2) and said the 4th diode (D4) series connection, first output of said current transformer and second output are connected to the 3rd node and the 4th node, wherein; Said the 3rd node is the node between said first diode (D1) and said the 3rd diode (D3), and said the 4th node is the node between said second diode (D2) and said the 4th diode (D4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200594203U CN202444454U (en) | 2012-02-22 | 2012-02-22 | Control circuit of direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200594203U CN202444454U (en) | 2012-02-22 | 2012-02-22 | Control circuit of direct current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202444454U true CN202444454U (en) | 2012-09-19 |
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ID=46825884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200594203U Expired - Lifetime CN202444454U (en) | 2012-02-22 | 2012-02-22 | Control circuit of direct current motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202444454U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296937A (en) * | 2012-02-22 | 2013-09-11 | 珠海格力电器股份有限公司 | Control circuit and control method of direct current motor |
| CN104393805A (en) * | 2014-11-19 | 2015-03-04 | 中国航空工业集团公司沈阳飞机设计研究所 | Airplane adjusting engine control circuit |
-
2012
- 2012-02-22 CN CN2012200594203U patent/CN202444454U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296937A (en) * | 2012-02-22 | 2013-09-11 | 珠海格力电器股份有限公司 | Control circuit and control method of direct current motor |
| CN104393805A (en) * | 2014-11-19 | 2015-03-04 | 中国航空工业集团公司沈阳飞机设计研究所 | Airplane adjusting engine control circuit |
| CN104393805B (en) * | 2014-11-19 | 2018-07-13 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of aircraft tune effect circuit for controlling motor |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120919 |
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| CX01 | Expiry of patent term |