CN214707130U - Relay control direct current motor circuit - Google Patents
Relay control direct current motor circuit Download PDFInfo
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- CN214707130U CN214707130U CN202120066840.3U CN202120066840U CN214707130U CN 214707130 U CN214707130 U CN 214707130U CN 202120066840 U CN202120066840 U CN 202120066840U CN 214707130 U CN214707130 U CN 214707130U
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- throw switch
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Abstract
The utility model relates to a relay control direct current motor circuit, which comprises a microcontroller and a double-pole double-throw switch relay connected with the microcontroller through a signal wire, wherein 2 normally open ends of the double-pole double-throw switch relay are sequentially connected with a first fuse and a power supply positive electrode in series; 2 normally closed ends of the double-pole double-throw switch relay are sequentially connected with a second fuse and a power supply cathode in series; 2 public ends of the double-pole double-throw switch relay are respectively connected with 2 terminals of the motor in series; the microcontroller is connected with the second fuse in series and used for receiving the voltage at two ends of the second fuse in real time. By adding the self-recovery fuse, the damage of a relay contact and a copper sheet or other devices during a short-circuit test is avoided, and the reliability of a product is improved.
Description
Technical Field
The utility model relates to a motor control technical field specifically is a relay control DC motor circuit.
Background
The existing relay control direct current motor circuit mainly comprises the following components: the system comprises a microcontroller 1, a double-pole double-throw relay 2, a motor 3 and a current sampling resistor 4; referring to the attached figure 1, a normally open end of the double-pole double-throw relay is connected with an external input power supply anode BAT, and a normally closed end of the double-pole double-throw relay is connected with a current sampling resistor in series and then connected with an external input power supply cathode GND; the microcontroller software controls the LOCK end and the UNLOCK end of the relay to be connected/disconnected through LOCK and UNLOCK signals; and meanwhile, the voltage at two ends of the current sampling resistor is collected, and the current of the motor is monitored in real time.
The existing circuit has the following problems when short circuit test is carried out:
1. when the relay is connected with two terminals of the motor to short circuit the power supply, the short circuit instantly generates instant heavy current to damage the relay contact and the copper sheet or other devices.
2. When the two terminals of the relay connecting motor are short-circuited to the ground or short-circuited between 2 terminals, the relay is attracted to generate instantaneous large current instantly, and the relay contact and the copper sheet or other devices are damaged.
Therefore, how to avoid the damage of the relay contact and the copper sheet or other devices during the short circuit test and improve the reliability of the product becomes a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a relay control direct current motor circuit is provided to solve the defect that exists among the prior art.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
a relay control direct current motor circuit comprises a microcontroller and a double-pole double-throw switch relay connected with the microcontroller through a signal wire, wherein a normally open end of the double-pole double-throw switch relay is sequentially connected with a first fuse and a power supply positive electrode in series; the normally closed end of the double-pole double-throw switch relay is sequentially connected with a second fuse and the negative electrode of the power supply in series; 2 public ends of the double-pole double-throw switch relay are respectively connected with 2 terminals of the motor in series; the microcontroller is connected with the second fuse in series and used for receiving the voltage at two ends of the second fuse in real time;
further, the first fuse and the second fuse are self-recovery fuses;
further, the signal lines are a LOCK signal line for controlling the LOCK end of the double-pole double-throw switch relay to be closed/disconnected and a UNLOCK signal line for controlling the UNLOCK end of the double-pole double-throw switch relay to be closed/disconnected respectively;
the utility model has the advantages that: by adding the self-recovery fuse, the damage of a relay contact and a copper sheet or other devices during a short-circuit test is avoided, and the reliability of a product is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art circuit configuration;
FIG. 2 is a schematic diagram of the circuit structure of the present invention;
the reference numerals are explained below:
1. the system comprises a microcontroller, a double-pole double-throw switch relay, a motor, a current sampling resistor, a first fuse, a second fuse and a current sampling resistor, wherein the microcontroller is 2;
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 2, a relay-controlled dc motor circuit includes a microcontroller 1 and a double-pole double-throw switch relay 2 connected to the microcontroller 1 through a signal line, wherein a normally open end of the double-pole double-throw switch relay is connected in series with a first fuse 5 and a positive electrode of a power supply in sequence; the normally closed end of the double-pole double-throw switch relay 2 is sequentially connected with a second fuse 6 and a power supply cathode in series; 2 public ends of the double-pole double-throw switch relay 2 are respectively connected with 2 terminals of the motor 3 in series; the microcontroller is connected with the second fuse in series and used for receiving the voltage at two ends of the second fuse in real time;
more specifically, the first fuse 5 and the second fuse 6 are self-recovery fuses;
the signal lines are a LOCK signal line for controlling the pull-in/break-off of the LOCK end of the double-pole double-throw switch relay 2 and a UNLOCK signal line for controlling the pull-in/break-off of the UNLOCK end of the double-pole double-throw switch relay 2 respectively;
the specific working principle is as follows:
referring to fig. 2, the circuit provided by the present scheme mainly consists of the following components: the system comprises a microcontroller, a double-pole double-throw relay, a motor fuse I and a fuse II;
the normally open end of the relay is connected with a first self-recovery fuse in series and then connected with the anode BAT of the external input power supply, and the normally closed end is connected with a second self-recovery fuse in series and then connected with the cathode GND of the external input power supply. And the microcontroller software controls the pull-in/pull-out of the LOCK end and the UNLOCK end of the relay through LOCK and UNLOCK signals, and simultaneously monitors the voltage at the two ends of the self-recovery fuse in real time.
When the relay is connected with two terminals of the motor to short circuit the power supply, the short circuit instantly generates instant heavy current to pass through the second self-recovery fuse, the second self-recovery fuse acts at the moment, the resistance is rapidly increased to break the circuit, and therefore the relay contact and the copper sheet or other devices are protected from being damaged. When the two terminals of the relay connecting motor are in short circuit with the ground, the relay is attracted instantly to generate instant heavy current to pass through the first self-recovery fuse, and the first self-recovery fuse acts at the moment, so that the resistance is rapidly increased to break the circuit, thereby protecting the relay contact and the copper sheet or other devices from being damaged.
When the relay is connected with a short circuit between two terminals of the motor, the relay actuation instantly generates instant heavy current to pass through the first self-recovery fuse and the second self-recovery fuse, at the moment, 2 self-recovery fuses act, and the resistance rapidly increases to break the circuit, so that the relay contact and the copper sheet or other devices are protected from being damaged.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (3)
1. A relay controlled DC motor circuit, characterized in that: the system comprises a microcontroller and a double-pole double-throw switch relay connected with the microcontroller through a signal wire, wherein the normally open end of the double-pole double-throw switch relay is sequentially connected with a first fuse and a power supply positive electrode in series; the normally closed end of the double-pole double-throw switch relay is sequentially connected with a second fuse and the negative electrode of the power supply in series; 2 public ends of the double-pole double-throw switch relay are respectively connected with 2 terminals of the motor in series; the microcontroller is connected with the second fuse in series and used for receiving the voltage at two ends of the second fuse in real time.
2. A relay controlled dc motor circuit according to claim 1, wherein: the first fuse and the second fuse are self-recovery fuses.
3. A relay controlled dc motor circuit according to claim 2, wherein: the signal lines are a LOCK signal line for controlling the attraction/disconnection of the LOCK end of the double-pole double-throw switch relay and a UNLOCK signal line for controlling the attraction/disconnection of the UNLOCK end of the double-pole double-throw switch relay respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120066840.3U CN214707130U (en) | 2021-01-13 | 2021-01-13 | Relay control direct current motor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120066840.3U CN214707130U (en) | 2021-01-13 | 2021-01-13 | Relay control direct current motor circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214707130U true CN214707130U (en) | 2021-11-12 |
Family
ID=78562615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120066840.3U Active CN214707130U (en) | 2021-01-13 | 2021-01-13 | Relay control direct current motor circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214707130U (en) |
-
2021
- 2021-01-13 CN CN202120066840.3U patent/CN214707130U/en active Active
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