CN201230294Y - Starting, current limiting protector for DC motor - Google Patents
Starting, current limiting protector for DC motor Download PDFInfo
- Publication number
- CN201230294Y CN201230294Y CNU2007201549789U CN200720154978U CN201230294Y CN 201230294 Y CN201230294 Y CN 201230294Y CN U2007201549789 U CNU2007201549789 U CN U2007201549789U CN 200720154978 U CN200720154978 U CN 200720154978U CN 201230294 Y CN201230294 Y CN 201230294Y
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- Prior art keywords
- control circuit
- current
- protector
- circuit
- transistor
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Abstract
The utility model relates to a current limiting protector for the starting of a DC motor, which is characterized in that the protector comprises an input end (IN), an output end (OUT), a Hall current sensor (H), a buck circuit, a control circuit and a DC/DC module, wherein the DC/DC module is used to supply power for the control circuit; the Hall current sensor (H) is connected between a load loop and the control circuit, and is used for detecting the current intensity of the load loop; and the buck circuit comprises a transistor connected with the control circuit. When the current of the load loop sampled by the Hall current sensor (H) exceeds reference current, the transistor is closed by the control circuit. After a limiting time, the transistor is conducted again through being controlled by the control circuit. The protector is used for limiting the starting current in primary starting stage of the DC motor to prevent the DC motor and a power supply from being impacted, so a motor driving system can be started with full load under a rated current. The protector is also used for preventing the overload of the motor current in the operation process. The protector has the advantages of simple structure and low cost, and is widely suitable for the starting and the operational protection of various DC brushed motors.
Description
Technical field
The utility model belongs to the protective device technical field of motor, is specifically related to a kind of start-up control of DC electromotor with brush and direct current machine startup, the limiting protector of running protection.
Background technology
DC electromotor with brush is as power driving part, because its characteristic such as simple in structure, present application is still very extensive.But using for more powerful brush motor at present, generally all adopting configuration starting resistance or the supply convertor version as start-up control, this structure not only takes up room greatly, and cost is higher, is not very convenient on using.
Because the work characteristics of DC electromotor with brush is: very little owing to motor windings resistance when electric motor starting, directly Gong Dian mode makes by the electric current of motor windings very big, out-of-control words will burn-out motor, power supply, but the too low motor on-load that can not make again of power-limiting normally starts.Therefore desirable start-up control system can protect motor and power supply by limiting starting current, can allow that again motor has certain starting power, reaches the purpose of starting under load.
The utility model content
The purpose of this utility model provides and a kind ofly prevents from motor and power supply thereof are impacted at DC motor starting initial stage restriction starting current, can make motor driven systems be with startup at full capacity under rated current; Non-overloading in running, and direct current machine simple in structure, that cost is low starts, limiting protector.
For achieving the above object, the technical solution adopted in the utility model is as follows:
A kind of direct current machine starts; limiting protector; it is characterized in that this circuit comprises input IN; output OUT; Hall current sensor H; buck circuit; control circuit and be the DC/DC module of control circuit power supply; described Hall current sensor H is connected between load current loop and the control circuit; be used to detect the load circuit size of current; described buck circuit comprises the transistor T that is connected with control circuit; the load circuit electric current of sampling when Hall current sensor surpasses reference current; control circuit cuts out described transistor; one paragraph qualification is after the time, the conducting again of control circuit oxide-semiconductor control transistors.
Described buck circuit also comprises a capacitor C and a diode D, described capacitor C is attempted by between the both positive and negative polarity of input, described diode D is attempted by between the both positive and negative polarity of output, first end of capacitor C is connected with described transistorized collector electrode, the negative pole of diode D is connected with the emitter of described transistor T, and transistorized collector and emitter is respectively as the positive pole of input and the positive pole of output.
Described DC/DC module is attempted by between the both positive and negative polarity of input.
Described control circuit comprises monostable flipflop U2, its reversed-phase output provide the described transistor T of control by and the control signal of conducting.
Described control circuit comprises a comparator U1, load circuit electric current and reference current that comparator receives the Hall current sensor sampling compare, the output of comparator is connected with the triggering pin of monostable flipflop U2, and the triggering signal of monostable flipflop action is provided.
Described control circuit comprises isolator and drive circuit, the input of isolator is connected with the reversed-phase output of monostable flipflop, its output is connected with the drive circuit input, and the output of drive circuit is connected with the grid of transistor T, is used for ending and conducting of oxide-semiconductor control transistors.
Described isolator is an optical coupling isolator.
Described transistor T is the IGBT pipe.
The input terminal of this protector connects power supply output, and lead-out terminal is connected with motor.The common chopper circuit version that constitutes of electric capacity and diode D, and utilize Hall current sensor to measure the electric motor loop size of current.When the current sampling signal value that obtains by Hall current sensor exceeds limit value, then control circuit moves and cuts out transistor rapidly, after closing the transistor certain hour, again open transistor by control circuit, thereby reach and both limit the electric motor loop electric current, and don't influence the purpose of the operate as normal of motor, when electric motor starting, the electric motor starting electric current is limited; After the motor operate as normal, the straight-through motor that makes of transistor can operate as normal.Working powers all in the described control circuit provide by the DC/DC converter.
The beneficial effects of the utility model are that this protector prevents from motor and power supply thereof are impacted at DC motor starting initial stage restriction starting current, motor driven systems is with is at full capacity started under rated current; Non-overloading in running, and simple in structure, cost is low.Can be applicable to the startup and the running protection of various brush direct current motors widely.
Description of drawings
Fig. 1 is the main circuit structure schematic diagram of the utility model embodiment;
Fig. 2 is the structure principle chart of the control circuit among Fig. 1.
Embodiment
As figure; this direct current machine starts, limiting protector comprises input IN, output OUT, Hall current sensor H, buck circuit, control circuit and the DC/DC module of powering for control circuit; described Hall current sensor H is connected between load current loop and the control circuit; be used to detect the load circuit size of current; described buck circuit comprises the transistor T that is connected with control circuit, and this transistor T is the IGBT pipe.The load circuit electric current of sampling when Hall current sensor surpasses reference current, and control circuit cuts out the IGBT pipe, and a paragraph qualification is after the time, and control circuit control IGBT manages conducting again.Described buck circuit also comprises a capacitor C and a diode D, described capacitor C is attempted by between the both positive and negative polarity of input, described diode D is attempted by between the both positive and negative polarity of output, first end of capacitor C is connected with the collector electrode of IGBT pipe, the negative pole of diode D is connected with the emitter of IGBT pipe T, and the collector and emitter of IGBT pipe is respectively as the positive pole of input and the positive pole of output.The DC/DC module is attempted by between the both positive and negative polarity of input.Control circuit comprises monostable flipflop U2, its reversed-phase output provide the described transistor T of control by and the control signal of conducting.Control circuit also comprises a comparator U1, load circuit electric current and reference current that comparator receives the Hall current sensor sampling compare, the output of comparator is connected with the triggering pin of monostable flipflop U2, and the triggering signal of monostable flipflop action is provided.Control circuit comprises isolator and drive circuit, and this isolator is an optical coupling isolator.The input of isolator is connected with the reversed-phase output of monostable flipflop, and its output is connected with the drive circuit input, and the output of drive circuit is connected with the grid of IGBT pipe, is used to control ending and conducting of IGBT pipe.
The input terminal IN of this protector connects power supply output, and lead-out terminal OUT is connected with motor.Main circuit adopts the chopper circuit version that is made of jointly IGBT pipe, capacitor C and diode D, and utilizes Hall current sensor to measure the electric motor loop size of current.When the current sampling signal value If that obtains by Hall current sensor exceeds limit value, then control circuit moves and cuts out the IGBT pipe rapidly, after closing the IGBT certain hour, again open IGBT by control circuit, thereby reach the purpose that both limits the electric motor loop electric current, and don't influence the operate as normal of motor, when electric motor starting, the electric motor starting electric current is limited; After the motor operate as normal, the straight-through motor that makes of IGBT can operate as normal.
Working powers all in the control circuit provide by the DC/DC converter.Control circuit course of work principle is as follows: after control circuit powers on, and monostable flipflop U
2Q be changed to 1, open main circuit IGBT module through after the light-coupled isolation, drive circuit, main circuit is powered to electric motor loop, electric motor loop flows through electric current I
fDetect by Hall current sensor, with detected electric motor loop current signal I
fTransfer to comparator U
1Inverting input, as this input sensed current signal I
fSurpass U
1The current limit value I of in-phase input end
gThe time, comparator U
1Output can be overturn, and triggers electrical equipment U thereby trigger monostable
2It is also overturn, Q is changed to 0, the low level signal of output is closed IGBT module T through photoelectricity coupling isolated drive circuit, through the monostable of the certain-length set by discrete component after the time, monostable circuit resets, and opens the IGBT module again behind process light-coupled isolation and the drive circuit, thereby reaches the purpose to electric motor loop starting current fast and reliable current limliting.Behind the electric motor starting, its normal loaded work piece electric current will be less than the limit value I of electric motor loop electric current
g, the IGBT module will be kept pass-through state, motor normal operation work this moment.I
gBe provided with can be by regulating comparator U
1The adjustable potentiometer VR of in-phase input end finishes.
Claims (8)
1. a direct current machine starts; limiting protector; it is characterized in that this protector comprises input IN; output OUT; Hall current sensor H; buck circuit; control circuit and be the DC/DC module of control circuit power supply; described Hall current sensor H is connected between load current loop and the control circuit; be used to detect the load circuit size of current; described buck circuit comprises the transistor T that is connected with control circuit; the load circuit electric current of sampling when Hall current sensor surpasses reference current; control circuit cuts out described transistor; one paragraph qualification is after the time, the conducting again of control circuit oxide-semiconductor control transistors.
2. direct current machine as claimed in claim 1 starts, limiting protector; it is characterized in that described buck circuit also comprises a capacitor C and a diode D; described capacitor C is attempted by between the both positive and negative polarity of input; described diode D is attempted by between the both positive and negative polarity of output; first end of capacitor C is connected with described transistorized collector electrode; the negative pole of diode D is connected with the emitter of described transistor T, and transistorized collector and emitter is respectively as the positive pole of input and the positive pole of output.
3. direct current machine as claimed in claim 1 starts, limiting protector, it is characterized in that described DC/DC module is attempted by between the both positive and negative polarity of input.
4. direct current machine as claimed in claim 1 starts, limiting protector, it is characterized in that described control circuit comprises monostable flipflop U2, its reversed-phase output provide the described transistor T of control by and the control signal of conducting.
5. direct current machine as claimed in claim 4 starts, limiting protector; it is characterized in that described control circuit comprises a comparator U1; load circuit electric current and reference current that comparator receives the Hall current sensor sampling compare; the output of comparator is connected with the triggering pin of monostable flipflop U2, and the triggering signal of monostable flipflop action is provided.
6. direct current machine as claimed in claim 4 starts, limiting protector; it is characterized in that described control circuit comprises isolator and drive circuit; the input of isolator is connected with the reversed-phase output of monostable flipflop; its output is connected with the drive circuit input; the output of drive circuit is connected with the grid of transistor T, is used for ending and conducting of oxide-semiconductor control transistors.
7. direct current machine as claimed in claim 6 starts, limiting protector, it is characterized in that described isolator is an optical coupling isolator.
8. direct current machine as claimed in claim 1 starts, limiting protector, it is characterized in that described transistor T is the IGBT pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201549789U CN201230294Y (en) | 2007-07-23 | 2007-07-23 | Starting, current limiting protector for DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201549789U CN201230294Y (en) | 2007-07-23 | 2007-07-23 | Starting, current limiting protector for DC motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201230294Y true CN201230294Y (en) | 2009-04-29 |
Family
ID=40635236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201549789U Expired - Fee Related CN201230294Y (en) | 2007-07-23 | 2007-07-23 | Starting, current limiting protector for DC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201230294Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997301A (en) * | 2010-08-06 | 2011-03-30 | 许晓华 | Start protecting circuit of low-voltage and high-power motor |
-
2007
- 2007-07-23 CN CNU2007201549789U patent/CN201230294Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997301A (en) * | 2010-08-06 | 2011-03-30 | 许晓华 | Start protecting circuit of low-voltage and high-power motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090429 |