CN114362500A - Voltage stabilization protection device, motor controller and motor - Google Patents
Voltage stabilization protection device, motor controller and motor Download PDFInfo
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Abstract
The invention discloses a voltage stabilization protection device, a motor controller and a motor, wherein the device comprises: a switch unit provided on an output side of an external input power supply; a first zener diode unit disposed at an output side of the switching unit; the current limiting unit is arranged between the first voltage stabilizing diode unit and the load power supply port; at the moment of switching on and off of the switch unit, the oscillating negative voltage and the oscillating negative current generated by the switch unit can firstly pass through the first voltage stabilizing diode unit and then pass through the current limiting unit. According to the scheme, the current-limiting resistor which does not flow through the voltage stabilizing circuit is controlled to vibrate by negative voltage and negative current at the moment of switching on and off of switching elements such as the alternating current contactor, so that the current-limiting resistor can be prevented from being burnt out, and further, the motor is prevented from being in fault shutdown.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a voltage stabilization protection device, a motor controller and a motor, in particular to a voltage stabilization protection circuit for preventing the on-off failure of the motor, a motor controller with the voltage stabilization protection circuit and a motor with the motor controller.
Background
When the motor works, the motor is often matched with an electric element such as an alternating current contactor and the like to execute on-off action to control the motor to operate and stop, the action can be called as tool on-off, and the action sequence is as follows: when the motor runs, the alternating current contactor is disconnected to stop the motor; when the motor stops, the alternating current contactor is switched on to enable the motor to run.
In the design of a direct current motor controller, an external input power supply is converted and processed by controlling the action sequence of various electronic elements to provide reliable required voltage and current for a motor main control chip, the circuit is called a power management circuit, and a voltage stabilizing circuit of a related scheme is a typical power management circuit.
A voltage stabilizing circuit designed by the motor controller needs to use a voltage stabilizing diode. In the voltage stabilizing circuit of the related scheme, after an external input power supply is input into a motor controller, the voltage and the current are firstly limited by a current limiting resistor, then input voltage and current signals are processed by various elements such as a voltage stabilizing diode, a magnetic bead, a filter capacitor and the like, and then processed, reliable and required voltage and current of a motor main control chip are provided for the motor main control chip, when a tool is switched on and off by switching elements such as an alternating current contactor and the like, because switching devices such as an alternating current contactor and the like can generate large oscillating voltage and oscillating current due to the on-off of internal mechanical parts, the oscillating voltage and current have positive and negative polarities, when negative voltage and current are generated, a voltage stabilizing diode in the voltage stabilizing circuit of the related scheme can be conducted in the forward direction, the positively conducted voltage stabilizing diode, the current limiting resistor and the external input power form a loop, and the large oscillating negative voltage and negative current in the loop cause the power flowing through the current limiting resistor to seriously exceed the rated power of the current limiting resistor, the current-limiting resistor is burnt out, so that the power input circuit cannot work, namely, the motor is stopped due to a fault.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a voltage stabilizing protection device, a motor controller and a motor, which aim to solve the problems that in a voltage stabilizing circuit of the motor controller, after an external input power supply is input into the motor controller, the voltage and the current are firstly provided for a main control chip of the motor through a current limiting resistor and then through a voltage stabilizing diode and other elements, but when the motor is switched on and off through a switching element such as an alternating current contactor and the like, a large oscillating negative voltage and negative current can be generated, so that the current limiting resistor is burnt out, and then the motor is in a fault shutdown state.
The invention provides a voltage stabilization protection device which can be applied between an external input power supply and a load power supply port; the voltage stabilization protection device comprises: the switch unit, the first voltage stabilizing diode unit and the current limiting unit; wherein the switching unit is disposed at an output side of the external input power supply; the first voltage stabilizing diode unit is arranged at the output side of the switch unit; the current limiting unit is arranged between the first voltage stabilizing diode unit and the load power supply port; at the moment of switching on and off of the switch unit, the oscillating negative voltage and the oscillating negative current generated by the switch unit can firstly pass through the first voltage stabilizing diode unit and then pass through the current limiting unit.
In some embodiments, the switching unit includes: a first switching element and a second switching element; the first switching element is provided on a positive connection line on an output side of the external input power supply; the second switching element is arranged on a negative connection line on the output side of the external input power supply; a cathode of the first zener diode unit disposed at an output side of the first switching element; an anode of the first zener diode unit disposed at an output side of the first switching element; the first end of the current limiting unit is arranged at the cathode of the first voltage stabilizing diode unit; and the second end of the current limiting unit is communicated with the load power supply port.
In some embodiments, further comprising: a magnetic bead unit; and the magnetic bead unit is arranged on the output side of the current limiting unit.
In some embodiments, further comprising: a filtering unit; and the filtering unit is positioned on the output side of the current limiting unit and is arranged between the input side of the load power supply port and the ground.
In some embodiments, further comprising: a filtering unit; the filtering unit is located on the output side of the magnetic bead unit and arranged between the input side of the load power supply port and the ground.
In some embodiments, the current limiting unit includes: a current limiting resistor; the number of the current-limiting resistors is more than one; and under the condition that the number of the current-limiting resistors is more than two, the more than two current-limiting resistors are arranged in parallel.
In some embodiments, further comprising: a second zener diode unit; the second voltage stabilizing diode unit is arranged at the output side of the current limiting unit; the cathode of the second voltage stabilizing diode unit is arranged at the second end of the current limiting unit; and the anode of the second voltage stabilizing diode unit is grounded.
In accordance with another aspect of the present invention, there is provided a motor controller, including: the voltage stabilization protection device is described above.
In accordance with the motor controller, a further aspect of the present invention provides a motor, including: the motor controller described above.
Therefore, according to the scheme of the invention, after an external input power supply is input into the motor controller in the voltage stabilizing circuit of the motor controller, the voltage and the current are provided for the main control chip of the motor through the voltage stabilizing diode and then through the current limiting resistor and other elements, so that the oscillating negative voltage and negative current generated when the motor performs tool on-off through the switching elements such as the alternating current contactor and the like are conducted through the voltage stabilizing diode and cannot flow through the current limiting resistor; therefore, the negative voltage and the negative current are controlled to oscillate without flowing through the current limiting resistor of the voltage stabilizing circuit at the moment of switching on and off of the switching elements such as the alternating current contactor, the burning of the current limiting resistor can be avoided, and the motor is prevented from being in fault shutdown.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a voltage stabilization protection apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an embodiment of a voltage regulator circuit according to a related aspect;
FIG. 3 is a schematic diagram of a voltage conduction direction of a voltage stabilizing circuit according to a related scheme when a voltage is oscillating and a current limiting resistor is burnt;
FIG. 4 is a schematic diagram of a voltage conduction direction of a voltage stabilizing circuit according to a related scheme for protecting a current limiting resistor from being burnt out during voltage and current oscillation;
FIG. 5 is a schematic diagram of a voltage regulator protection circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the voltage conduction direction of the voltage stabilizing protection circuit of the present invention during voltage oscillation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, a voltage stabilization protection apparatus is provided. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The voltage stabilization protection device can be applied between an external input power supply and a load power supply port. The voltage stabilization protection device comprises: the circuit comprises a switch unit, a first voltage stabilizing diode unit and a current limiting unit. A switching unit, such as a switching element M. The first zener diode unit is, for example, a zener diode D1 provided at the front end of the current limiting resistor R1 in the examples shown in fig. 5 and 6. A current limiting element such as a current limiting resistor R1. And a load power supply port, such as a power supply input port 2 of the motor main control chip.
Wherein the switching unit is provided at an output side of the external input power supply.
The first zener diode unit is disposed at an output side of the switching unit.
The current limiting unit is arranged between the first voltage stabilizing diode unit and the load power supply port.
At the moment of switching on and off of the switch unit, the oscillating negative voltage and the oscillating negative current generated by the switch unit can firstly pass through the first voltage stabilizing diode unit and then pass through the current limiting unit.
FIG. 2 is a schematic diagram illustrating an embodiment of a voltage regulator circuit according to a related embodiment. In fig. 2, the voltage regulator circuit includes: the circuit comprises an external power supply equivalent resistor R1, an external input power supply E, a switching element M, a current limiting resistor R1, a voltage stabilizing diode D1, a magnetic bead L1 and a nonpolar capacitor C1. The output end of the voltage stabilizing circuit is output to the power input port 2 of the motor main control chip to supply power to the motor main control chip. The external input of the circuit is provided with an external power supply input (such as external direct current power supply), an equivalent resistor r1 of the external power supply input and an external switch element M, the output of the circuit is provided with a power supply input port 2 of the motor main control chip, and the power supply input port 2 of the motor main control chip provides required working voltage and working current for the motor main control chip.
The voltage stabilizing circuit of the related scheme is composed of an external power supply input, an external switch element (such as an alternating current contactor and the like), a resistor R1, a magnetic bead L1, a voltage stabilizing diode D1, a non-polar capacitor C1, a ground GND port and a power supply input port 2 of a motor main control chip, wherein the switch element (such as the alternating current contactor and the like) generates oscillating voltage and oscillating current when being switched on and off, the resistor R1 is a current limiting resistor, and the voltage stabilizing diode D1 plays a voltage stabilizing role, particularly, the voltage stabilizing diode D1 is switched on later than the current limiting resistor in the circuit, namely, when the external power supply is input, the current is preferentially limited by the current limiting resistor and then passes through the voltage stabilizing diode D1, the magnetic bead L1 is specially used for restraining high-frequency noise and peak interference of the voltage stabilizing circuit, and also has the capacity of absorbing electrostatic pulses, and the capacitor C1 is used for filtering.
In the voltage stabilizing circuit provided by the scheme of the invention, the voltage stabilizing diode moves forwards in the current limiting resistor, namely the protective diode M, the voltage stabilizing diode D1, the current limiting resistor R1, the magnetic bead L1 and the capacitor C1 are connected with an external power supply circuit before the D1 is connected with the R1.
Fig. 3 is a schematic diagram of a voltage conduction direction of a current limiting resistor of a voltage stabilizing circuit according to a related scheme during voltage oscillation. The action sequence of the voltage stabilizing circuit in the related scheme when the ac contactor is turned on and off can refer to the example shown in fig. 3, when the motor normally operates, the external power source inputs (voltage and current) in a positive direction, the input is provided to the motor main control chip after passing through the current limiting resistor R1, the voltage stabilizing diode D1 and the filter capacitor (such as the nonpolar capacitor C1), and at this time, the voltage stabilizing diode D1 normally performs voltage stabilizing work, and the voltage and current direction of the current limiting resistor R1 are a positive and B negative (positive voltage oscillation is shown in a short dashed line conduction flow S1 in fig. 3).
At the moment of switching on and off (such as switching on) of the motor, the switching element M generates oscillating negative voltage B and negative large current, the zener diode D1 is conducted in the forward direction (conducted when the oscillating negative voltage B and the negative large current are greater than the conduction voltage a), the oscillating negative voltage B and the negative large current directly pass through the current limiting resistor R1, the power of the oscillating negative voltage B and the negative large current is far greater than the rated power of the current limiting resistor R1, so that the current limiting resistor R1 is damaged, the voltage and the current direction of the current limiting resistor R1 are a negative and B positive, and after the current limiting resistor R1 is damaged, the power input circuit cannot normally work, so that the motor is failed and stopped (the negative voltage oscillating is shown in a long dotted line conduction flow S2 in fig. 3).
Among the characteristics of the zener diode itself: when the anode voltage is greater than the cathode voltage (in the scheme of the present invention, the anode of the zener diode D1 is connected to GND), the zener diode exhibits the single-pass characteristic of a common diode, that is, the current can flow from the anode to the cathode of the zener diode, and the on-state voltage a in the scheme of the present invention can be regarded as: the voltage which can make the current of the voltage-stabilizing tube flow from the anode to the cathode is similar to the breakover voltage of a common diode;
FIG. 4 is a schematic diagram of a voltage conduction direction of a voltage regulator circuit according to a related embodiment for protecting a current limiting resistor from burning out during voltage and current oscillation. The circuit for protecting the current-limiting resistor from being burnt out by the voltage stabilizing circuit in the related scheme during voltage and current oscillation is shown in fig. 4, when the motor normally operates, the input of an external power supply (voltage and current) in the positive direction is limited by a current-limiting resistor D1, the diode M1 is conducted in the positive direction, a voltage stabilizing diode D1 stabilizes voltage, and a nonpolar capacitor C filters the input voltage and provides the input voltage to a motor main control chip, at the moment, the voltage stabilizing diode D1 normally works in a voltage stabilizing mode, and the voltage and current directions of the current-limiting resistor R1 are A positive and B negative (the positive voltage oscillation is shown in a short dashed line conduction flow S1 in fig. 4).
If a diode is additionally arranged on the forehead of the current limiting resistor R1 based on the circuit of the related scheme, by utilizing the unidirectional conductivity of the diode, when the oscillating negative voltage and current generated instantly when the switching element M is switched on and off, and after the oscillating negative voltage and current flow through the voltage stabilizing diode D1, the oscillating negative voltage and current cannot flow through the diode due to the unidirectional conductivity of the diode, the current limiting resistor R1 cannot burn out due to the negative voltage and negative current flowing through the diode when the switching elements M such as an alternating current contactor are switched on and off, and the current limiting function of the current limiting resistor R1 on the related scheme of the current input port is ensured.
At the moment of switching on and off of the motor, the switching element M generates oscillating negative voltage b and negative large current, and at the moment, the zener diode D1 is in forward conduction (more than a conduction) at the moment, and due to the unidirectional conduction of the ordinary diode M1, the negative voltage and current oscillation cannot flow through the current limiting resistor R1, so that the current limiting resistor R1 is protected. However, at this time, path leakage needs to be found for negative voltage oscillation generated at the moment of switching on and off of the motor, because the reverse insulation of the common diode M1 protects the current-limiting resistor, but the negative voltage oscillation is caused to completely flow into the motor controller to form a loop, and the motor fault cannot work normally due to damage of a motor control chip caused by large instantaneous energy.
Considering that negative voltage and negative current are generated along with the repeated on-off of the motor and are uncontrollable, the power is always hundreds times of the rated power of the current-limiting resistor, and the current-limiting resistor is easy to burn. Therefore, it is necessary to protect the current-limiting resistor from being burned out due to the oscillation generated when the switching devices such as the ac contactor are turned on and off through circuit design and control methods, and it is highly desirable and necessary to avoid affecting the functions of the power input circuit. Therefore, the scheme of the invention designs a voltage stabilizing protection circuit for preventing the on-off fault of the motor by analyzing the principle that the switching elements such as an alternating current contactor generate voltage oscillation at the input power port of the motor controller, and the voltage stabilizing protection circuit can control the oscillating negative voltage and the oscillating negative current conduction direction at the moment of on-off of the switching elements, so that the current limiting resistor of the voltage stabilizing circuit does not bear the oscillating voltage and does not pass through too large oscillating current, the current limiting resistor is ensured not to be burnt out when the switching elements such as the alternating current contactor are on and off, and simultaneously the current limiting function of the current limiting resistor in the related scheme of the voltage stabilizing circuit is ensured, and the functions of the voltage stabilizing circuit are not influenced.
In some embodiments, the switching unit includes: a first switching element and a second switching element. The first switching element is provided on a positive connection line on an output side of the external input power supply. The second switching element is provided on a negative connection line on an output side of the external input power supply.
And a cathode of the first zener diode unit is disposed at an output side of the first switching element.
And an anode of the first zener diode unit is disposed at an output side of the first switching element.
And the first end of the current limiting unit is arranged at the cathode of the first voltage stabilizing diode unit. And the second end of the current limiting unit is communicated with the load power supply port.
The voltage stabilizing protection circuit for preventing the motor from being in on-off failure can control the negative voltage and negative current oscillation not to flow through the current limiting resistor R1 of the voltage stabilizing circuit at the on-off moment of the switching elements M such as the alternating current contactor and the like, and ensures that the current limiting resistor R1 of the voltage stabilizing circuit cannot be damaged when the switching elements M such as the alternating current contactor and the like are on or off. Meanwhile, when the motor normally operates, the current limiting function of the current limiting resistor R1 of the voltage stabilizing protection circuit in the related scheme of the voltage stabilizing circuit is not affected, the normal operation of various functions (voltage stabilization, current limiting, filtering and the like) in the voltage stabilizing circuit at the moment of switching on and switching off and in the long-term operation of the motor is ensured, and the cost of the whole circuit is not increased. Therefore, the problem that when the motor executes the action sequence through a switching device (namely, a switching element M) such as an alternating current contactor, and the like, a large oscillating negative voltage and a large negative current are generated when the switching device such as the alternating current contactor is switched on and switched off due to internal mechanical parts, and the oscillating negative voltage and the large negative current lead to the forward conduction of the voltage stabilizing diode D1, so that the current limiting resistor R1 bears the large negative voltage and the large negative current, the current limiting resistor R1 is burnt, and the power supply input circuit cannot work, namely, the motor is stopped due to faults is solved.
Compared with the forward conduction, reverse cut-off and one-way conduction of a common diode (such as the diode M1), the forward characteristic of the voltage stabilizing diode (such as the voltage stabilizing diode D1) is the same as that of the common diode, but the reverse characteristic is more special, when the reverse voltage of the voltage stabilizing diode D1 is added to a certain degree, although the tube is in a breakdown state, a larger current can be passed without being damaged, and the repeatability of the phenomenon is good, as long as the voltage stabilizing diode D1 is in the breakdown state, although the current flowing through the voltage stabilizing diode is greatly changed, the voltage at two ends of the voltage stabilizing diode D1 is extremely changed, and the voltage stabilizing effect can be achieved.
In some embodiments, further comprising: and a magnetic bead unit, such as a magnetic bead L1. And the magnetic bead unit is arranged on the output side of the current limiting unit.
In the examples shown in fig. 5 and 6, the magnetic beads L1 are dedicated to suppressing high frequency noise and spike interference of the voltage regulator circuit, and also have the ability to absorb electrostatic pulses.
In some embodiments, further comprising: the filtering unit, such as the non-polar capacitor C1 and the non-polar capacitor C1, plays a role in filtering. And the filtering unit is positioned on the output side of the current limiting unit and is arranged between the input side of the load power supply port and the ground.
In some embodiments, further comprising: the filtering unit, such as the non-polar capacitor C1 and the non-polar capacitor C1, plays a role in filtering. The filtering unit is located on the output side of the magnetic bead unit and arranged between the input side of the load power supply port and the ground.
Fig. 5 is a schematic structural diagram of an embodiment of the regulated protection circuit of the present invention. As shown in FIG. 5, the invention relates to a voltage stabilizing protection circuit for preventing the on-off failure of a motor, which can realize the forced voltage stabilizing effect of negative voltage oscillation and negative current oscillation at the power input end of a motor controller, so that a current limiting resistor R1 can not be burnt out due to oscillation when switching devices such as an AC contactor are switched on and off, and simultaneously, when the motor normally operates, the current limiting function of the related scheme of the current limiting resistor R1 at the current input port of the voltage stabilizing protection circuit is not influenced, and the normal operation of each function (voltage stabilization, current limiting and the like) of the power input circuit at the moment of switching on and off and long-term operation of the motor is ensured, wherein the circuit is composed of an external power input, a switching element (such as an AC contactor and the like) M1, a current limiting resistor R1, a magnetic bead L1, a voltage stabilizing diode D1, a non-polar capacitor C1, a ground GND and a power input port 2 of a main control chip of the motor, wherein the switching element (such as an AC contactor and the like) can generate oscillation and negative current during switching on and off, the resistor R1 is a current-limiting resistor, the voltage-stabilizing diode D1 plays a voltage-stabilizing role, and particularly, the voltage-stabilizing diode D1 is connected in the circuit before the current-limiting resistor R1, namely, when external voltage is input, the external voltage preferentially passes through the voltage-stabilizing diode D1 and then passes through the current-limiting resistor R1 to perform the current-limiting function.
Fig. 6 is a schematic diagram of the voltage conduction direction of the voltage stabilizing protection circuit of the present invention during voltage oscillation. As shown in fig. 6, when the motor normally operates, the external power input (voltage and current) is in a positive direction, the input is limited by a current-limiting resistor R1, regulated by a voltage-stabilizing diode D1, and filtered by a non-polar capacitor C1 and then provided to the motor main control chip, at this time, the voltage-stabilizing diode D1 normally operates in a voltage-stabilizing manner, and the voltage and current directions of the current-limiting resistor R1 are a positive and B negative (positive voltage oscillation is shown in fig. 6, which is nothing more than a short dashed line conduction flow S1).
When the oscillation voltage generated by the power input end is larger than the working voltage of the voltage stabilizing diode D1, the voltage stabilizing diode D1 preferentially acts, the effect is that the instantaneous oscillation voltage is stabilized to a preset voltage stabilizing value, and the oscillation voltage maintained to the voltage stabilizing value supplies power to the power input port 2 of the motor main control chip through the action of the current limiting resistor R1, the magnetic bead L1 and the filtering nonpolar capacitor C1. When the generated oscillation voltage is less than the working voltage of the voltage stabilizing diode D1, the voltage stabilizing diode D1 does not act, and the oscillation voltage lower than the voltage stabilizing value supplies power to the power input port 2 of the motor main control chip through the action of the current limiting resistor R1, the magnetic bead L1 and the filtering nonpolar capacitor C1.
At the moment of switching on and off of the motor, because the on-off action of a motor operation switching element (such as an alternating current contactor and the like) M1 is executed by a mechanical structure, instantaneous oscillation negative voltage and negative current oscillation can be generated during mechanical switching on and off, at the moment, a voltage stabilizing diode is conducted in the positive direction (more than conduction of a), oscillation negative voltage B and negative heavy current directly flow out of a voltage stabilizing circuit after passing through a voltage stabilizing tube, at the moment, the voltage and current directions of a current limiting resistor R1 are A positive and B negative, a power supply input circuit normally works, and the motor normally operates (the negative voltage oscillation is shown in a long dotted line conduction flow S2 in figure 6).
Through the actions, the voltage of the current limiting resistor R1 is stable and within the rated power requirement, the voltage stabilizing circuit normally works when the motor is switched on and off, the current limiting resistor R1 is ensured not to be burnt due to overlarge negative voltage oscillation and negative current oscillation generated when switching devices such as an alternating current contactor and the like are switched on and off, and meanwhile, the current limiting function of the current limiting resistor R1 in the related scheme of the current input port is ensured, and the functions of the power input circuit are not influenced.
In some embodiments, the current limiting unit includes: a current limiting resistor. The number of the current limiting resistors is more than one. And under the condition that the number of the current-limiting resistors is more than two, the more than two current-limiting resistors are arranged in parallel.
In some alternative embodiments, more than 2 current limiting resistors R1 may be connected in parallel to ensure that the zener diode is turned on in the forward direction due to the negative voltage when the switching device M1 such as the ac contactor is turned on and off, and the current limiting resistor R1 does not burn out due to the negative voltage and the negative current flowing through it.
According to the scheme of the invention, the voltage stabilizing diode D1 is connected in the circuit before the current limiting resistor R1, namely when external voltage is input, the external voltage preferentially passes through the voltage stabilizing diode D1 and then passes through the current limiting resistor R1 to limit current. At the moment of switching on and off of the motor, because the on-off action of a motor operation switch element (such as an alternating current contactor and the like) is executed by a mechanical structure, instantaneous oscillation negative voltage and negative current oscillation can be generated during mechanical switching on and off, at the moment, a voltage stabilizing diode is conducted in the forward direction (more than conduction in a), oscillation negative voltage B and negative heavy current directly flow out of a voltage stabilizing circuit after passing through a voltage stabilizing tube, at the moment, the voltage and current directions of a current limiting resistor R1 are A positive and B negative, a power supply input circuit works normally, and the motor operates normally. When the motor is switched on and off, the voltage stabilizing circuit works normally, so that the current limiting resistor is prevented from being burnt due to overlarge negative voltage oscillation and negative current oscillation generated when switching devices such as an alternating current contactor and the like are switched on and off, and meanwhile, the current limiting function of the current limiting resistor R1 in the related scheme of the current input port is ensured, and various functions of the power input circuit are not influenced.
In some embodiments, further comprising: a second zener diode block, such as another zener diode, disposed behind the current limiting resistor R1 in the example shown in fig. 5 and 6.
And the second voltage stabilizing diode unit is arranged at the output side of the current limiting unit.
And the cathode of the second voltage stabilizing diode unit is arranged at the second end of the current limiting unit. And the anode of the second voltage stabilizing diode unit is grounded.
In some alternative embodiments, a zener diode D1 may be added in addition to the current limiting resistor R1 on the basis of the circuit of the related scheme to absorb the oscillating negative voltage and current generated instantaneously when the switching element M1 is turned on and off, and at the same time, more than 2 current limiting resistors R1 are connected in parallel to ensure that the zener diode is turned on in the forward direction due to the negative voltage when the switching element M1 such as the ac contactor is turned on and off, so that the current limiting resistor R1 is not burned out due to the negative voltage and negative current, and the current limiting function of the related scheme of the current limiting resistor R1 at the current input port is ensured.
According to the scheme of the invention, the positions of the current limiting resistors R1 are compared, the circuit generating negative voltage/negative current oscillation is compared, and the voltage stabilizing circuit is judged, so that the negative voltage and the negative current oscillation are controlled not to flow through the current limiting resistor R1 of the voltage stabilizing circuit at the moment of switching on and switching off of the switching element M1, and the current limiting resistor R1 of the voltage stabilizing circuit is ensured not to be damaged when the switching element M1 such as an alternating current contactor is switched on and switched off. Meanwhile, when the motor normally operates, the current limiting function of the current limiting resistor R1 of the voltage stabilizing protection circuit in the related scheme of the voltage stabilizing circuit is not affected, the normal operation of various functions (voltage stabilization, current limiting, filtering and the like) in the voltage stabilizing circuit at the moment of switching on and switching off and in the long-term operation of the motor is ensured, and the cost of the whole circuit is not increased.
By adopting the technical scheme of the invention, after an external input power supply is input into the motor controller in the voltage stabilizing circuit of the motor controller, the voltage and the current are provided for the main control chip of the motor through the voltage stabilizing diode and then through the current limiting resistor and other elements, so that the motor conducts oscillating negative voltage and negative current generated when the tool is switched on and off through the switching elements such as an alternating current contactor and the like through the voltage stabilizing diode without flowing through the current limiting resistor; therefore, the negative voltage and the negative current are controlled to oscillate without flowing through the current limiting resistor of the voltage stabilizing circuit at the moment of switching on and off of the switching elements such as the alternating current contactor, the burning of the current limiting resistor can be avoided, and the motor is prevented from being in fault shutdown.
According to the embodiment of the invention, the motor controller corresponding to the voltage stabilization protection device is also provided. The motor controller may include: the voltage stabilization protection device is described above.
Since the processes and functions implemented by the motor controller of this embodiment basically correspond to the embodiments, principles and examples of the apparatus, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
By adopting the technical scheme of the invention, after an external input power supply is input into the motor controller in the voltage stabilizing circuit of the motor controller, the voltage and the current are provided for the main control chip of the motor through the voltage stabilizing diode and then through the current limiting resistor and other elements, so that the oscillating negative voltage and negative current generated when the motor performs the on-off of the tool through the switching elements such as an alternating current contactor and the like are conducted through the voltage stabilizing diode and do not flow through the current limiting resistor, and the normal work of various functions (voltage stabilization, current limiting, filtering and the like) in the voltage stabilizing circuit during the on-off instant and long-term running of the motor is ensured.
According to an embodiment of the present invention, there is also provided a motor corresponding to the motor controller. The motor may include: the motor controller described above.
Since the processes and functions implemented by the motor of this embodiment substantially correspond to the embodiments, principles and examples of the motor controller, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment, which is not described herein.
By adopting the technical scheme of the embodiment, after an external input power supply is input into the motor controller in the voltage stabilizing circuit of the motor controller, the voltage and the current are provided for the main control chip of the motor through the voltage stabilizing diode and then through the current limiting resistor and other elements, so that the oscillating negative voltage and negative current generated when the motor performs tool on-off through the switching elements such as the alternating current contactor and the like are conducted through the voltage stabilizing diode and cannot flow through the current limiting resistor, and the whole circuit is low in cost.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. The voltage stabilization protection device is characterized in that the voltage stabilization protection device can be applied between an external input power supply and a load power supply port; the voltage stabilization protection device comprises: the switch unit, the first voltage stabilizing diode unit and the current limiting unit; wherein,
the switch unit is arranged on the output side of the external input power supply;
the first voltage stabilizing diode unit is arranged at the output side of the switch unit;
the current limiting unit is arranged between the first voltage stabilizing diode unit and the load power supply port;
at the moment of switching on and off of the switch unit, the oscillating negative voltage and the oscillating negative current generated by the switch unit can firstly pass through the first voltage stabilizing diode unit and then pass through the current limiting unit.
2. The regulated protection device according to claim 1, wherein said switching unit comprises: a first switching element and a second switching element; the first switching element is provided on a positive connection line on an output side of the external input power supply; the second switching element is arranged on a negative connection line on the output side of the external input power supply;
a cathode of the first zener diode unit disposed at an output side of the first switching element;
an anode of the first zener diode unit disposed at an output side of the first switching element;
the first end of the current limiting unit is arranged at the cathode of the first voltage stabilizing diode unit; and the second end of the current limiting unit is communicated with the load power supply port.
3. The regulated protection device according to claim 1, further comprising: a magnetic bead unit;
and the magnetic bead unit is arranged on the output side of the current limiting unit.
4. The regulated protection device according to claim 1, further comprising: a filtering unit;
and the filtering unit is positioned on the output side of the current limiting unit and is arranged between the input side of the load power supply port and the ground.
5. The regulated protection device according to claim 3, further comprising: a filtering unit;
the filtering unit is located on the output side of the magnetic bead unit and arranged between the input side of the load power supply port and the ground.
6. The regulated protection device according to claim 1, wherein said current limiting unit comprises: a current limiting resistor; the number of the current-limiting resistors is more than one;
and under the condition that the number of the current-limiting resistors is more than two, the more than two current-limiting resistors are arranged in parallel.
7. The regulated protection device according to any one of claims 1 to 6, further comprising: a second zener diode unit;
the second voltage stabilizing diode unit is arranged at the output side of the current limiting unit;
the cathode of the second voltage stabilizing diode unit is arranged at the second end of the current limiting unit; and the anode of the second voltage stabilizing diode unit is grounded.
8. A motor controller, comprising: a regulated voltage protection device as claimed in any one of claims 1 to 7.
9. An electric machine, comprising: the motor controller of claim 8.
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| CN202111555841.5A CN114362500B (en) | 2021-12-17 | 2021-12-17 | Voltage stabilization protection device, motor controller and motor |
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| CN202111555841.5A CN114362500B (en) | 2021-12-17 | 2021-12-17 | Voltage stabilization protection device, motor controller and motor |
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| CN114362500B CN114362500B (en) | 2023-11-24 |
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| JPH052462U (en) * | 1991-06-21 | 1993-01-14 | 株式会社アドバンテスト | Line control device |
| US20110040988A1 (en) * | 2009-08-14 | 2011-02-17 | Xianfang Wang | Single phase line switch |
| CN104659774A (en) * | 2015-02-11 | 2015-05-27 | 深圳市航盛电子股份有限公司 | Low-voltage input power supply port protection circuit |
| KR20170028217A (en) * | 2015-09-03 | 2017-03-13 | 엘에스산전 주식회사 | Charging apparatus for gate unit of high voltage direct current system |
| CN110676801A (en) * | 2019-09-18 | 2020-01-10 | 无锡盛景电子科技有限公司 | Anti-oscillation overvoltage protection circuit |
| CN209994105U (en) * | 2019-06-20 | 2020-01-24 | 深圳市中创工业互联网有限公司 | Hot plug protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH052462U (en) * | 1991-06-21 | 1993-01-14 | 株式会社アドバンテスト | Line control device |
| US20110040988A1 (en) * | 2009-08-14 | 2011-02-17 | Xianfang Wang | Single phase line switch |
| CN104659774A (en) * | 2015-02-11 | 2015-05-27 | 深圳市航盛电子股份有限公司 | Low-voltage input power supply port protection circuit |
| KR20170028217A (en) * | 2015-09-03 | 2017-03-13 | 엘에스산전 주식회사 | Charging apparatus for gate unit of high voltage direct current system |
| CN209994105U (en) * | 2019-06-20 | 2020-01-24 | 深圳市中创工业互联网有限公司 | Hot plug protection circuit |
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| Publication number | Publication date |
|---|---|
| CN114362500B (en) | 2023-11-24 |
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