CN214480530U - Magnetic control switch circuit module and motor drive circuit - Google Patents
Magnetic control switch circuit module and motor drive circuit Download PDFInfo
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- CN214480530U CN214480530U CN202120201431.XU CN202120201431U CN214480530U CN 214480530 U CN214480530 U CN 214480530U CN 202120201431 U CN202120201431 U CN 202120201431U CN 214480530 U CN214480530 U CN 214480530U
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Abstract
The utility model discloses a magnetic control switch circuit module and a motor driving circuit, the magnetic control switch circuit module is characterized in that the magnetic control switch circuit module comprises an energy storage unit, a reference unit, a sampling unit, a comparison unit, a magnetic control switch and a power switch; two ends of the energy storage unit are respectively connected with the module input end and the module output end; the energy storage unit is a capacitor, the reference unit is connected with the energy storage unit in parallel, the reference unit is formed by connecting a resistor and a reference device in series, and the reference device is a clamping diode (D1) or a voltage stabilizing tube; the sampling unit is a voltage division circuit formed by connecting at least 2 resistors in series; the comparison unit adopts an operational amplifier as a comparator; the power switch is bridged at the input end of the module and the output end of the module, and the output end of the operational amplifier is also connected with the control end of the power switch. The magnetic control switch circuit module and the motor driving circuit are simple in structure, easy to implement and capable of effectively driving the motor.
Description
Technical Field
The utility model relates to a magnetic control switch circuit module and motor drive circuit.
Background
The traditional linear push rod motor and the like adopt two wires to realize positive and negative movement of a direct current motor, one switch is used, the direct current motor stops when being pressed to the switch, but the switch has larger size and shorter mechanical life, and by means of Hall elements or reed pipes and the like, current is insufficient, or three or more wires are not needed for realizing the two wires, or power consumption is too large.
Therefore, it is necessary to design a new magnetic switch circuit module and a motor driving circuit.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a magnetic control switch circuit module and motor drive circuit are provided, this magnetic control switch circuit module and motor drive circuit drive performance are strong, and the circuit is succinct (only needs two lines) and the consumption is little.
The technical solution of the utility model is as follows:
a magnetic control switch circuit module comprises an energy storage unit, a reference unit, a sampling unit, a comparison unit, a magnetic control switch and a power switch;
two ends of the energy storage unit are respectively connected with the module input end and the module output end;
the energy storage unit is a capacitor, the reference unit is connected with the energy storage unit in parallel, the reference unit is formed by connecting a resistor and a reference device in series, and the reference device is a clamping diode (D1) or a voltage stabilizing tube;
the sampling unit is a voltage division circuit formed by connecting at least 2 resistors in series;
the comparison unit adopts an operational amplifier as a comparator, the non-inverting input end of the operational amplifier is connected with the voltage division point of the voltage division circuit, and the inverting input end of the operational amplifier is connected with the output end of the reference unit; the positive and negative power supply ends of the operational amplifier are respectively connected with the positive end and the negative end of the capacitor; the output end of the operational amplifier is connected with the output end of the module through the magnetic control switch;
the power switch is bridged at the input end of the module and the output end of the module, and the output end of the operational amplifier is also connected with the control end of the power switch.
The magnetic control switch is a reed switch or a Hall switch device.
The voltage drop of the reference device is stabilized at any value between 0.7 and 2.5V.
The sampling voltage in the sampling unit is between 1/5-1/3 of the total voltage.
The power switch is an N-MOS tube or an IGBT.
The output end of the operational amplifier is also connected with the control end of the power switch through the driving unit. The control terminal is generally the G pole of the MOS tube or the G pole of the IGBT.
The driving unit (also called a pushing unit) is an emitter follower circuit composed of an NPN triode and a PNP triode, and is actually a PNP and NPN complementary emitter follower.
A reverse diode (D4) for reverse connection protection is connected between the module input end and the module output end; the anode and the cathode of the backward diode are respectively connected with the output end of the module and the input end of the module.
And a forward diode (D2) is connected between the anode of the capacitor and the input end of the module, and the anode of the forward diode is connected with the input end of the module.
A motor driving circuit comprises two magnetic control switch circuit modules; the two magnetic control switch circuit modules are connected in series in a power supply circuit of the motor after being reversely connected in parallel;
the magnetic control switch circuit module is the magnetic control switch circuit module.
The capacitance range of the capacitor is 100 pF-47 uF, and the value needs to be adjusted correspondingly according to the circuit frequency. The power switch is an N-MOS tube, the reference device is a diode, and the sampling voltage in the sampling unit is 1/4 of the total voltage.
Has the advantages that:
the utility model discloses a magnetic control switch circuit module and motor drive circuit only need two lines, do not have the switch life problem, do not have the big problem of consumption, can realize that the positive and negative motion of control motor arrives first automatic stop.
In conclusion, the magnetic control switch circuit module and the motor driving circuit are compact in structure, simple in circuit and strong in driving capability.
Drawings
FIG. 1 is a schematic block diagram of a magnetic control switch circuit module;
FIG. 2 is a typical circuit of a magnetically controlled switch circuit module (with a reed switch and with a drive unit);
FIG. 3 is a typical circuit of a magnetically controlled switch circuit module (with Hall devices and with a drive unit);
FIG. 4 is a schematic diagram of a motor drive circuit (with reed switches and drive unit);
FIG. 5 is a schematic diagram of a motor drive circuit (with Hall devices and with a drive unit);
FIG. 6 is a schematic diagram of a motor drive circuit (with reed switches and no drive unit);
fig. 7 is a schematic diagram of a motor drive circuit (with hall devices and without drive unit).
FIG. 8 is a schematic diagram of a magnetic control switch circuit module with a P-MOS tube and a reed switch.
Detailed Description
The invention will be described in further detail with reference to the following figures and specific embodiments:
example 1: referring to fig. 1-3, a magnetic switch circuit module includes an energy storage unit, a reference unit, a sampling unit, a comparison unit, a magnetic switch and a power switch;
two ends of the energy storage unit are respectively connected with the module input end and the module output end;
the energy storage unit is a capacitor C1, the reference unit is connected with the energy storage unit in parallel, the reference unit is formed by connecting a resistor R1 and a reference device in series, and the reference device is a clamping diode D1;
the sampling unit is a voltage division circuit formed by connecting 2 resistors R2 and R3 in series;
the comparison unit adopts an operational amplifier IC1 (model No. LM2903) as a comparator, the non-inverting input end of the operational amplifier is connected with the voltage dividing point of the voltage dividing circuit (namely the connection point of R2 and R3), and the inverting input end of the operational amplifier is connected with the output end of the reference unit (namely the positive pole of D1); the positive and negative power supply ends of the operational amplifier are respectively connected with the positive end and the negative end of the capacitor; the output end of the operational amplifier is connected with the output end of the module through a magnetic control switch (S1 or IC2, IC2 is a Hall sensor, and the model is A3209); the output end of the specific operational amplifier is connected with the OUT end of the IC 2; the GND terminal of IC2 is connected to ground.
The power switch Q3 is an NMOS tube and is bridged at the input end and the output end of the module, namely the D pole is connected with the power supply at the positive end (namely the negative pole of D4), and the S pole is connected with the output end of the module;
the output end of the operational amplifier is also connected with the control end of the power switch, namely the G pole of the Q3 through the driving unit.
The driving unit is an emitter follower circuit composed of an NPN triode Q1 and a PNP triode Q2, and is actually a PNP and NPN complementary emitter follower.
The magnetic control switch is a reed switch or a Hall switch device.
The reference device is a diode, and the voltage drop is stabilized at 0.7V.
The sampling voltage in the sampling unit is 1/4 of the total voltage.
A reverse diode D4 for reverse connection protection is connected between the module input end and the module output end; the anode and the cathode of the backward diode are respectively connected with the output end of the module and the input end of the module.
And a forward diode D2 is connected between the anode of the capacitor and the input end of the module, and the anode of the forward diode is connected with the input end of the module.
Referring to fig. 4-5, a motor driving circuit includes two magnetic control switch circuit modules; the two magnetic control switch circuit modules are connected in series in a power supply circuit of the motor after being reversely connected in parallel;
the magnetic control switch circuit module is the magnetic control switch circuit module.
The power switch is an N-MOS tube.
Like fig. 6 and 7, the same function can be achieved without the driving unit.
Description of the working process:
the working principle is typically applied as shown in fig. 4 and 5. The magnetic control switch circuit is structurally characterized in that a motor moves to drive a magnet to move, when the magnet moves to a reed switch or a position sensed by a Hall sensor, a first circuit is powered off, the motor stops moving, when a system supplies power in a reverse direction, a second circuit works, and when the magnet moves to a limit position in the reverse direction, the reed switch or the Hall sensor of the second circuit senses the magnet and the second circuit is powered off, the motor stops moving.
As shown in fig. 4, when the motor power supply 1 is a positive motor power supply 2 is negative, the upper magnetic control switch circuit module works, when the system starts to be powered on, current charges C1 through D3 and D2, and C1 is an energy storage device, at this time, the inverting terminal of the comparator IC1 quickly reaches a set reference voltage because no external capacitor is provided, the voltage rising speed is slower than that of the inverting terminal because the sampling circuit at the non-inverting terminal of the comparator IC1 has an external capacitor, the output is low, and the Q3 large-current electronic switch is in a cut-off state. When the voltage of the same-phase terminal rises and exceeds the reference voltage, the output of the comparator is inverted, namely the output is high, and at the moment, the Q3 large-current electronic switch is driven by R4 and Q1 to be conducted. After the circuit is turned on, two ends of the circuit (namely, the magnetic control switch circuit module) are short-circuited by Q3, the electric quantity in the energy storage capacitor C1 is slowly consumed, the voltage at two ends of C1 is reduced, the voltage at the same phase end of the comparator IC1 obtained by the sampling circuit is also reduced, and the reduction speed has certain delay due to the storage of C2, so that the frequent switching is not caused. When the voltage at the inverting terminal of comparator IC1 drops below the reference voltage at the inverting terminal, comparator IC1 output flips low. The Q3 high-current electronic switch is cut off under the drive of Q2. When the circuit is cut off, voltage exists at two ends of the circuit, and the previous charging process is repeated. And circulating all the time.
When a reed switch or hall element senses the magnet, the IC1 output is shorted so that Q3 cannot conduct at all times. At this time, the current passing through the motor is only the loss current of the circuit, the power consumption can be ignored, and the motor can not run because Q3 is cut off.
The power tube can also be a P-MOS tube, and a relevant circuit diagram is shown in figure 8.
Claims (10)
1. A magnetic control switch circuit module is characterized by comprising an energy storage unit, a reference unit, a sampling unit, a comparison unit, a magnetic control switch and a power switch;
two ends of the energy storage unit are respectively connected with the module input end and the module output end;
the energy storage unit is a capacitor, the reference unit is connected with the energy storage unit in parallel, the reference unit is formed by connecting a resistor and a reference device in series, and the reference device is a clamping diode or a voltage stabilizing tube;
the sampling unit is a voltage division circuit formed by connecting at least 2 resistors in series;
the comparison unit adopts an operational amplifier as a comparator, the non-inverting input end of the operational amplifier is connected with the voltage division point of the voltage division circuit, and the inverting input end of the operational amplifier is connected with the output end of the reference unit; the positive and negative power supply ends of the operational amplifier are respectively connected with the positive end and the negative end of the capacitor; the output end of the operational amplifier is connected with the output end of the module through the magnetic control switch;
the power switch is bridged at the input end of the module and the output end of the module, and the output end of the operational amplifier is also connected with the control end of the power switch;
the power switch is an N-MOS tube or an IGBT.
2. The magnetically controlled switch circuit module according to claim 1, wherein the magnetically controlled switch is a reed switch or a hall switch device.
3. The magnetic control switch circuit module according to claim 1, wherein the voltage drop of the reference device is stabilized at any value between 0.7 and 2.5V.
4. The magnetic switch circuit module according to claim 1, wherein the sampling voltage in the sampling unit is between 1/5-1/3 of the total voltage.
5. The magnetically controlled switch circuit module according to claim 1, wherein the capacitor has a capacitance value in the range of 100pF to 47 uF.
6. The magnetically controlled switch circuit module according to claim 1, wherein the output terminal of the operational amplifier is further connected to the control terminal of the power switch through the driving unit.
7. The magnetically controlled switch circuit module according to claim 6, wherein the driving unit is an emitter follower circuit comprising an NPN transistor and a PNP transistor.
8. The magnetically controlled switch circuit module according to claim 1, wherein a reverse diode for reverse connection protection is connected between the module input terminal and the module output terminal; the anode and the cathode of the backward diode are respectively connected with the output end of the module and the input end of the module.
9. The magnetic control switch circuit module according to any one of claims 1 to 8, wherein a forward diode is connected between the positive electrode of the capacitor and the input end of the module, and the positive electrode of the forward diode is connected with the input end of the module.
10. A motor driving circuit is characterized by comprising two magnetic control switch circuit modules; the two magnetic control switch circuit modules are connected in series in a power supply circuit of the motor after being reversely connected in parallel;
the magnetic control switch circuit module is the magnetic control switch circuit module as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120201431.XU CN214480530U (en) | 2021-01-25 | 2021-01-25 | Magnetic control switch circuit module and motor drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120201431.XU CN214480530U (en) | 2021-01-25 | 2021-01-25 | Magnetic control switch circuit module and motor drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214480530U true CN214480530U (en) | 2021-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120201431.XU Active CN214480530U (en) | 2021-01-25 | 2021-01-25 | Magnetic control switch circuit module and motor drive circuit |
Country Status (1)
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|---|---|
| CN (1) | CN214480530U (en) |
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2021
- 2021-01-25 CN CN202120201431.XU patent/CN214480530U/en active Active
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