CN214851013U - Power supply switching circuit and power supply switching device - Google Patents
Power supply switching circuit and power supply switching device Download PDFInfo
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- CN214851013U CN214851013U CN202120908665.8U CN202120908665U CN214851013U CN 214851013 U CN214851013 U CN 214851013U CN 202120908665 U CN202120908665 U CN 202120908665U CN 214851013 U CN214851013 U CN 214851013U
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Abstract
The utility model provides a brushless motor system which replaces a power supply switching circuit and a power supply switching device applied by a brush motor, wherein the power supply switching circuit comprises a full-bridge rectification circuit, a direction control circuit, a first input end and a second input end, wherein the first input end and the second input end are connected with a power supply; the first end of the full-bridge rectification circuit is connected with the first input end, the second end of the full-bridge rectification circuit is connected with the first power input port of the motor system, the third end of the full-bridge rectification circuit is connected with the second input end, and the fourth end of the full-bridge rectification circuit is connected with the second power input port of the motor system; the first end of the direction control circuit is connected with the second input end, and the second end of the direction control circuit is connected with the control port. The technical scheme of the utility model, can realize the positive and negative control of changeing of motor through the positive and negative switching of external power source to can solve because the power joins conversely and lead to the problem of motor system damage.
Description
Technical Field
The utility model relates to the technical field of electric machines, in particular to power supply switching circuit and power supply switching device.
Background
At present, the direction of a power supply is changed directly to realize the steering control of a motor of a brush motor, the brushless motor needs a special controller for control, the power input of the controller can only be positive, the direction control of the brushless motor needs a special logic circuit for control, and the brushless motor has a complex circuit structure and high cost. In addition, the wiring of the existing brushless motor system and an external power supply cannot be reversely connected, and once the wiring is reversely connected, the motor system can be burnt out.
SUMMERY OF THE UTILITY MODEL
The utility model provides a provenance switching circuit and power switching device aims at realizing the positive and negative control of changeing of motor through the switching of external power supply positive and negative to solve because the power joins conversely and lead to the problem of motor system damage.
In order to achieve the above object, the present invention provides a power switching circuit, which is applied to a brushless motor system, wherein the brushless motor system is provided with a power input first port, a power input second port and a control port; the power supply switching circuit comprises a full-bridge rectifying circuit, a direction control circuit, a first input end and a second input end, wherein the first input end and the second input end are connected with a power supply;
the first end of the full-bridge rectifying circuit is connected with the first input end, the second end of the full-bridge rectifying circuit is connected with the first power input port, the third end of the full-bridge rectifying circuit is connected with the second input end, and the fourth end of the full-bridge rectifying circuit is connected with the second power input port;
the first end of the direction control circuit is connected with the second input end, and the second end of the direction control circuit is connected with the control port.
Optionally, the full-bridge rectification circuit includes a first diode, a second diode, a third diode and a fourth diode;
the anode of the second diode and the cathode of the fourth diode are connected with the first input end; the cathode of the second diode and the cathode of the first diode are connected with the power input first port; the anode of the first diode and the cathode of the third diode are connected with the second input end; and the anode of the third diode and the anode of the fourth diode are connected with the power input second port.
Optionally, the direction control circuit includes a fifth diode, a first resistor, and a first capacitor;
the cathode of the fifth diode is connected with the second input end, and the anode of the fifth diode is connected with the control port through the first resistor;
the first end of the first capacitor is connected with the power input second port, and the second end of the first capacitor is connected with the control port.
Optionally, the power switching circuit further includes a surge protection module;
the first end of the surge protection module is connected with the second end of the full-bridge rectification circuit, and the second end of the surge protection module is connected with the fourth end of the full-bridge rectification circuit.
Optionally, the surge protection module includes a transient diode;
the first end of the transient diode is connected with the second end of the full-bridge rectification circuit, and the second end of the transient diode is connected with the fourth end of the full-bridge rectification circuit.
Optionally, the power switching circuit further includes a filter circuit;
the first end of the filter circuit is connected with the second end of the full-bridge rectification circuit, and the second end of the filter circuit is connected with the fourth end of the full-bridge rectification circuit.
Optionally, the filter circuit includes a second capacitor, a third capacitor, and a second resistor;
the first end of the second capacitor and the first end of the third capacitor are connected with the second end of the full-bridge rectification circuit, the second end of the second capacitor is connected with the first end of the second resistor, and the second end of the second resistor and the second end of the third capacitor are connected with the fourth end of the full-bridge rectification circuit.
Optionally, the power switching circuit further includes a fourth capacitor;
and the first end of the fourth capacitor is connected with the second end of the full-bridge rectification circuit, and the second end of the fourth capacitor is connected with the fourth end of the full-bridge rectification circuit.
To achieve the above object, the present invention provides a power switching device, which includes the power switching circuit as described above.
The technical scheme of the utility model, supply voltage to external power input carries out the rectification through setting up full-bridge rectifier circuit and handles, make no matter external power is just connecing or the transposition, the first port of power input of motor system all is positive voltage, the power input second port is received all is negative voltage, and direction control circuit can provide corresponding control signal for motor system according to the power polarity that the second input is connected, make motor system can come the rotation direction of control motor according to received control signal, need not adopt a plurality of transistors to come the steering of cooperative control motor, circuit structure is simpler, circuit cost is lower. And, the utility model discloses a full-bridge rectifier circuit can avoid damaging the condition emergence of motor system because external power source joins conversely.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram of an embodiment of a power switching circuit according to the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the power switching circuit of the present invention;
fig. 3 is a block diagram of another embodiment of the power switching circuit of the present invention;
fig. 4 is a schematic circuit diagram of another embodiment of the power switching circuit of the present invention;
fig. 5 is a block diagram of another embodiment of the power switching circuit of the present invention;
fig. 6 is a schematic circuit diagram of another embodiment of the power switching circuit of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a power supply switching circuit, be applied to brushless motor system, wherein, brushless motor system includes brushless motor and brushless drive plate, be equipped with power input first port J2 on the brushless drive plate, power input second port J4 and control port J5, wherein, power input first port J2 and power input second port J4 are used for supplying power for motor system, control port J5 is used for providing control signal for motor system 40, in order to realize the change of the direction of motor.
Optionally, referring to fig. 1, the power switching circuit includes a full-bridge rectification circuit 20, a direction control circuit 30, and a first input terminal J1 and a second input terminal J3 connected to the external power supply 10; the first end 1 of the full-bridge rectifier circuit 20 is connected with a first input end J1, the second end 2 of the full-bridge rectifier circuit 20 is connected with a power input first port J2, the third end 3 of the full-bridge rectifier circuit 20 is connected with the second input end J3, and the fourth end of the full-bridge rectifier circuit 20 is connected with the power input second port J4; a first end of the direction control circuit 30 is connected to the second input terminal J3, and a second end of the direction control circuit 30 is connected to a control port J5 on a drive board of the motor system 40.
The full-bridge rectifier circuit 20 has a first path and a second path inside, and has the following characteristics: if the first input terminal J1 is connected to the positive power supply terminal of the external power supply 10, and the second input terminal J3 is connected to the negative power supply terminal of the external power supply 10, the first channel is turned on, the second channel is turned off, the second terminal 2 of the full-bridge rectifier circuit 20 outputs a positive voltage V + to the first power supply input port J2, and the fourth terminal 4 of the full-bridge rectifier circuit 20 outputs a negative voltage V-to the second power supply input port J4; if the first input terminal J1 is connected to the negative terminal of the external power source 10, and the second input terminal J3 is connected to the positive terminal of the external power source 10, the first channel is cut off, the second channel is connected, the second terminal 2 of the full-bridge rectifier circuit outputs the positive voltage V + to the first power input port J2, and the fourth terminal of the full-bridge rectifier circuit outputs the negative voltage V-to the second power input port J4.
The direction control circuit 30 is configured to output a corresponding control signal to the motor system 40 according to the polarity of the power source connected to the second input terminal J3, so as to control the rotation direction of the motor.
The specific working principle is as follows:
the first input end J1 is set to be connected with the positive electrode of the external power supply 10, the second input end J2 is set to be connected with the negative electrode of the external power supply 10, then the first channel of the full-bridge rectification circuit 20 is switched on, the second channel is switched off, the positive voltage input by the first input end J1 is transmitted to the power supply input first port J2 through the first channel, power is supplied to the motor system 40, and the motor system 40 operates normally. Meanwhile, the first terminal of the direction control circuit 30 is connected to the negative terminal of the power supply, the first terminal of the direction control circuit 30 is in a low level state, and accordingly the direction control circuit 30 generates a low level electric signal to the control port J5 of the motor system 40 to control the motor to operate in a CW (clockwise) direction.
The first input end J1 is set to be connected with the negative electrode of the external power supply 10, the second input end J3 is set to be connected with the positive electrode of the external power supply 10, then the first channel of the full-bridge rectification circuit 20 is cut off, the second channel is connected, the positive voltage input by the second input end J3 is transmitted to the first power input port J2 through the second channel, power is supplied to the motor system 40, and the motor system 40 operates normally. Meanwhile, the first terminal of the direction control circuit 30 is connected to the positive power supply, the first terminal of the direction control circuit 30 is in a high state, and accordingly, the direction control circuit 30 generates a high electric signal to the control port J5 of the motor system 40 to control the motor to operate in a CCW (counterclockwise) direction. It will be appreciated that it may also be provided that when the first terminal of the directional control circuit 30 is at a low level, the directional control circuit 30 generates a high level control signal to the control port J5 of the motor system 40 to control the motor to operate in the CCW direction; when the first terminal of the direction control circuit 30 is at a high level, the direction control circuit 30 generates a low level control signal to the control port J5 of the motor system 40 to control the motor to operate in the CW direction.
To sum up, this application carries out rectification processing to the mains voltage of external power input through setting up full-bridge rectifier circuit 20, make no matter external power is just connecing or the transposition, the first port J2 of power input of motor system 40 received all is positive voltage, the power input second port J4 received all is negative voltage, direction control circuit 30 can provide corresponding control signal for motor system according to the power polarity that second input J3 is connected, make motor system can come the rotation direction of control motor according to received control signal, need not adopt the steering of a plurality of transistors come cooperation control motor, circuit structure is simpler, circuit cost is lower. The full-bridge rectification circuit 20 can avoid the condition that the motor system is damaged due to reverse connection of an external power supply.
Alternatively, referring to fig. 2, the full-bridge rectification circuit 20 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the anode of the second diode D2 and the cathode of the fourth diode D4 are connected to the first input terminal J1; the cathode of the second diode D2 and the cathode of the first diode D1 are connected with the power input first port J2; the anode of the first diode D1 and the cathode of the third diode D3 are connected to the second input terminal J3; the anode of the third diode D3 and the anode of the fourth diode D4 are connected to the power input second port J4.
The specific working principle is as follows:
setting the first input terminal J1 to be connected to the positive terminal of the power supply and the second input terminal J3 to be connected to the negative terminal of the power supply, then the first diode D1 and the fourth diode D4 are turned off due to the reverse blocking characteristic, the second diode D2 and the third diode D3 are turned on, the positive voltage of the first input terminal J1 is output to the power supply input first port J2 of the motor system 40 through the second diode D2, and the positive voltage V + is provided to the power supply input first port J2; and the negative voltage at the second input terminal J3 is output to the power input second port J4 of the motor system 40 via the third diode D3 to provide a negative voltage V-to the power input second port J4.
Setting the first input terminal J1 to be connected with the negative pole of the power supply, and the second input terminal J3 to be connected with the positive pole of the power supply, then the second diode D2 and the third diode D3 are disconnected due to the characteristic of reverse cut-off, the first diode D1 and the fourth diode D4 are connected, the positive voltage of the second input terminal J3 is transmitted to the first power supply input port J2 of the motor system 40 through the first diode D1, and the positive voltage V + is provided for the first power supply input port J2; and the cathode voltage of the first input terminal J1 is output to the power input second port J4 of the motor system through the fourth diode D4 to provide the cathode voltage V-to the power input second port J4.
It can be seen that no matter whether the external power supply 10 is connected in the positive direction or in the reverse direction, the full-bridge rectifier circuit 20 is provided, so that the power input first port J2 of the motor system 40 receives positive voltage, and the power input second port J4 of the motor system 40 receives negative voltage, thereby preventing the motor from being damaged due to the reverse connection of the positive and negative electrodes of the external power supply, and achieving the purpose of protecting the motor.
Alternatively, referring to fig. 2, the direction control circuit 30 includes a fifth diode D5, a first resistor R1, and a first capacitor C1; the cathode of the fifth diode D5 is connected to the second input terminal J3, and the anode of the fifth diode D5 is connected to the control port J5 of the motor system 40 through the first resistor R1; the first terminal of the first capacitor C1 is connected to the power input second port J4 of the motor system 40, and the second terminal of the first capacitor C1 is connected to the control port J5 of the motor system.
The specific working principle is as follows:
setting the first input terminal J1 to be connected to the positive pole of the power supply and the second input terminal J3 to be connected to the negative pole of the power supply, the fifth diode D5 is turned on, the voltage of the control port J5 of the motor system 40 is pulled down to the negative pole voltage V "through the fifth diode D5, the control port J5 of the motor system 40 is at a low level, and at this time, the motor operates in the CW direction.
The first input J1 is set to be connected to the negative terminal of the power supply, the second input J3 is connected to the positive terminal of the power supply, the fifth diode D5 is disconnected, and the control port J5 of the motor system 40 is maintained at a high level (the control port J5 of the motor system 40 is set to be at a high level by default), at which time, the motor operates in the CCW direction.
Optionally, referring to fig. 3, the power switching circuit further includes a surge protection module 50; a first end of the surge protection module 50 is connected to the power input first port J2 of the motor system 40 (i.e., the first end 1 of the full-bridge rectifier circuit 20), and a second end of the surge protection module 50 is connected to the power input second port J4 of the motor system 40 (i.e., the fourth end 4 of the full-bridge rectifier circuit 20).
The surge protection module 50 may be formed of a transient diode. The surge protection module 50 is used for absorbing a pulse spike, preventing surge impact, and further ensuring that the dc voltage output to the motor system 40 is clean and stable.
Optionally, referring to fig. 3, the surge protection module includes a transient diode TVS; a first terminal of the transient diode TVS is connected to the power input first port J2 of the motor system 40, and a second terminal of the transient diode TVS is connected to the power input second port J4 of the motor system 40.
The transient diode TVS is used to absorb a pulse spike, prevent surge impact, and further ensure clean and stable voltage output to the motor 40.
Alternatively, in one embodiment, as shown in fig. 4, the transient diode TVS may be a unidirectional transient diode, the cathode of which is connected to the power input first port J2 of the motor system 40, and the anode of which is connected to the power input second port J4 of the motor system 40.
Optionally, in other embodiments, the transient diode TVS may also be a bidirectional transient diode.
Optionally, referring to fig. 5, the power switching circuit further includes a filter circuit 60; a first end of the filter circuit 60 is connected to the second end 2 of the full-bridge rectifier circuit 20, and a second end of the filter circuit 60 is connected to the fourth end 4 of the full-bridge rectifier circuit 20.
The filter circuit 60 is a high-pass filter circuit, and is configured to filter the voltage output by the full-bridge rectifier circuit 20, so that the voltage is transmitted to the brushless circuit, and the voltage of 40 is more stable and clean.
Alternatively, referring to fig. 6, the filter circuit 60 includes a second capacitor C2, a third capacitor C3, and a second resistor R2; the first end of the second capacitor C2 and the first end of the third capacitor C3 are both connected to the second end 2 of the full-bridge rectifier circuit 20; a second end of the second capacitor C2 is connected with a first end of a second resistor R2; the second terminal of the second resistor R2 and the second terminal of the third capacitor C3 are connected to the fourth terminal 4 of the full-bridge rectifier circuit 20.
In this embodiment, the second capacitor C2 and the second resistor R2 form a high frequency filter circuit to ensure the voltage V + and V-outputted to the motor system 40 to be clean and stable. The third capacitor C3 is a high-voltage ceramic capacitor for absorbing high-frequency interference of the circuit.
Optionally, referring to fig. 6, the power switching circuit further includes a fourth capacitor C4; a first end of the fourth capacitor C4 is connected to the second end 2 of the full-bridge rectifier circuit 20, and a second end of the fourth capacitor C4 is connected to the fourth end 4 of the full-bridge rectifier circuit 20.
In this embodiment, the fourth capacitor C4 is an energy storage capacitor, and is used to enhance the instantaneous output capability of the voltages V + and V-output to the motor system 40, and to improve the stability of the voltages V + and V-output to the motor system.
In order to achieve the above object, the present invention further provides a power switching device, which includes the above power switching circuit, and the detailed structure of the power switching circuit can refer to the above embodiments, which are not described herein again; it can be understood that, because the utility model discloses an above-mentioned power supply switching circuit has been used among the power switching device, consequently, the utility model discloses power switching device's embodiment includes all technical scheme of the whole embodiments of above-mentioned power supply switching circuit, and the technical effect who reaches is also identical, no longer gives unnecessary details here.
The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. A power supply switching circuit is applied to a brushless motor system, wherein the brushless motor system is provided with a power supply input first port, a power supply input second port and a control port; the power supply switching circuit comprises a full-bridge rectifying circuit, a direction control circuit, a first input end and a second input end, wherein the first input end and the second input end are connected with a power supply;
the first end of the full-bridge rectifying circuit is connected with the first input end, the second end of the full-bridge rectifying circuit is connected with the first power input port, the third end of the full-bridge rectifying circuit is connected with the second input end, and the fourth end of the full-bridge rectifying circuit is connected with the second power input port;
the first end of the direction control circuit is connected with the second input end, and the second end of the direction control circuit is connected with the control port.
2. The power supply switching circuit according to claim 1, wherein the full-bridge rectification circuit includes a first diode, a second diode, a third diode, and a fourth diode;
the anode of the second diode and the cathode of the fourth diode are connected with the first input end; the cathode of the second diode and the cathode of the first diode are connected with the power input first port; the anode of the first diode and the cathode of the third diode are connected with the second input end; and the anode of the third diode and the anode of the fourth diode are connected with the power input second port.
3. The power switching circuit of claim 2, wherein the direction control circuit comprises a fifth diode, a first resistor, and a first capacitor;
the cathode of the fifth diode is connected with the second input end, and the anode of the fifth diode is connected with the control port through the first resistor;
the first end of the first capacitor is connected with the power input second port, and the second end of the first capacitor is connected with the control port.
4. The power switching circuit according to any one of claims 1-3, wherein the power switching circuit further comprises a surge protection module;
the first end of the surge protection module is connected with the second end of the full-bridge rectification circuit, and the second end of the surge protection module is connected with the fourth end of the full-bridge rectification circuit.
5. The power switching circuit of claim 4, wherein the surge protection module comprises a transient diode;
the first end of the transient diode is connected with the second end of the full-bridge rectification circuit, and the second end of the transient diode is connected with the fourth end of the full-bridge rectification circuit.
6. The power switching circuit of claim 5, wherein the transient diode is a unidirectional transient diode or a bidirectional transient diode.
7. The power switching circuit of claim 1, wherein the power switching circuit further comprises a filter circuit;
the first end of the filter circuit is connected with the second end of the full-bridge rectification circuit, and the second end of the filter circuit is connected with the fourth end of the full-bridge rectification circuit.
8. The power switching circuit of claim 7, wherein the filter circuit comprises a second capacitor, a third capacitor, and a second resistor;
the first end of the second capacitor and the first end of the third capacitor are connected with the second end of the full-bridge rectification circuit, the second end of the second capacitor is connected with the first end of the second resistor, and the second end of the second resistor and the second end of the third capacitor are connected with the fourth end of the full-bridge rectification circuit.
9. The power switching circuit according to claim 1, wherein the power switching circuit further comprises a fourth capacitor;
and the first end of the fourth capacitor is connected with the second end of the full-bridge rectification circuit, and the second end of the fourth capacitor is connected with the fourth end of the full-bridge rectification circuit.
10. A power switching device, characterized in that it comprises a power switching circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120908665.8U CN214851013U (en) | 2021-04-28 | 2021-04-28 | Power supply switching circuit and power supply switching device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120908665.8U CN214851013U (en) | 2021-04-28 | 2021-04-28 | Power supply switching circuit and power supply switching device |
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| Publication Number | Publication Date |
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| CN214851013U true CN214851013U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120908665.8U Active CN214851013U (en) | 2021-04-28 | 2021-04-28 | Power supply switching circuit and power supply switching device |
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| CN (1) | CN214851013U (en) |
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2021
- 2021-04-28 CN CN202120908665.8U patent/CN214851013U/en active Active
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