CN209217701U - Low-voltage alternating-current electric machine controller over-pressure safety device - Google Patents
Low-voltage alternating-current electric machine controller over-pressure safety device Download PDFInfo
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- CN209217701U CN209217701U CN201822216947.2U CN201822216947U CN209217701U CN 209217701 U CN209217701 U CN 209217701U CN 201822216947 U CN201822216947 U CN 201822216947U CN 209217701 U CN209217701 U CN 209217701U
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Abstract
The utility model provides a kind of low-voltage alternating-current electric machine controller over-pressure safety device, including voltage detecting circuit, voltage control circuit and battery, one of input terminal of the voltage detecting circuit is electrically connected with the DC bus of the input side of electric machine controller, another input terminal is electrically connected with the both ends of battery, output end is electrically connected with the voltage control circuit, the voltage control circuit includes controller and for controlling the first electric switch that DC bus charges a battery and the second electric switch for discharging for controlling battery to DC bus, the controller is electrically connected with first electric switch and second electric switch.The utility model has both been able to maintain DC bus-bar voltage and has stablized, improved the control performance of electric machine controller using energy exchange is carried out between battery and DC bus, motor power can be made to recycle again, with good economy, and the apparatus structure is simple, and production cost is low.
Description
Technical field
The utility model relates to Motor Control Fields more particularly to a kind of low-voltage alternating-current electric machine controller overvoltage protection to fill
It sets.
Background technique
Currently, an important branch of the low-voltage alternating-current motor as motor, in small household appliances and small scale robot field
Using more and more extensive.Low-voltage alternating-current electric machine controller is by the way that low-voltage DC is converted into three-phase alternating current to control
Motor rotation, due to needing motor rapidly to stop in many motor applications or rapidly starting, will result in motor in this way and exists
Occasional is in power generation mode in control process, increases the input side DC voltage of electric machine controller instantaneously, once the direct current
Voltage value is more than the input voltage permissible value of electric machine controller, will result in the damage of electric machine controller internal components, therefore reality
It should be avoided that rise the input side DC voltage of low voltage motor controller excessively high in.
In order to realize that motor can rapidly stop or rapidly start, while avoiding the input side direct current of electric machine controller
Pressure rises excessively high, and there are two types of ways relatively common at present, and one is use pressure voltage higher when designing electric machine controller
Component to improve the voltage endurance capability of entire electric machine controller, but undoubtedly just improves the production of electric machine controller in this way
Cost and design difficulty；Another is to connect brake unit on the input side DC bus of electric machine controller, the braking
The principle of unit is when the voltage on DC bus is more than certain value, and brake unit will be extra by its internal braking resistor
Power consumption fall to making DC bus-bar voltage be restored to normal range (NR), due to this method be by resistance consumption energy, because
Portion generates a large amount of heat in the device for this its meeting, so that the raising of whole device temperature causes the reliability of device to reduce, and
For requiring the application of low-power consumption, this method is simultaneously not suitable for.Therefore design it is a kind of it is energy-saving, at low cost, structure is simple
Low-voltage alternating-current electric machine controller over-pressure safety device is necessary.
Utility model content
The purpose of this utility model is to provide a kind of low-voltage alternating-current electric machine controller over-pressure safety devices, it is intended to for mentioning
For a kind of energy-saving, at low cost, simple low-voltage alternating-current electric machine controller over-pressure safety device of structure.
The utility model is realized in this way:
The utility model provides a kind of low-voltage alternating-current electric machine controller over-pressure safety device, including voltage detecting circuit, electricity
Press control circuit and battery, the input side of one of input terminal and electric machine controller of the voltage detecting circuit it is straight
Bus electrical connection is flowed, another input terminal is electrically connected with the both ends of battery, and output end is electrically connected with the voltage control circuit
It connects, the voltage control circuit includes controller and for controlling the first electric switch and use that DC bus charges a battery
In the second electric switch to discharge for controlling battery to DC bus, the controller and first electric switch and described the
The electrical connection of two electric switches.
Further, between the DC bus and the battery by connection at charging and discharging circuit, described the
One electric switch and second electric switch are both connected in the charging and discharging circuit.
Further, first electric switch and second electric switch are transistor electric switch and the two reverse parallel connection
Connection.
Further, first electric switch and second electric switch are N-channel MOS FET.
Further, the voltage detecting circuit includes the first differential amplifier circuit and the second differential amplifier circuit, described
Two input terminals of the first difference channel are electrically connected with the positive and negative both ends of the DC bus respectively, output end and the controller
Electrical connection, two input terminals of second difference channel be electrically connecteds with the positive and negative both ends of the battery respectively, output end and
The controller electrical connection.
Further, first differential amplifier circuit includes first resistor, second resistance, 3rd resistor, the 4th resistance
And first amplifier, the positive input terminal of first amplifier passes through the second resistance and the anode of the DC bus connects
It connecing, negative input end is connect by the first resistor with the negative terminal of the DC bus, and output end is connect with the controller, and
It is connected between negative input end and the output end by the 3rd resistor, positive input terminal also passes through the 4th resistance eutral grounding；
Second differential amplifier circuit includes the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and the second amplifier, institute
The positive input terminal for stating the second amplifier is connect by the 5th resistance with the anode of the battery, and negative input end passes through described
6th resistance is connect with the negative terminal of the battery, and output end is connect with the controller, and negative input end and the output end
Between connected by the 8th resistance, positive input terminal also passes through the 7th resistance eutral grounding.
Compared with prior art, the utility model has the following beneficial effects:
This low-voltage alternating-current electric machine controller over-pressure safety device provided by the utility model, it is female using battery and direct current
Energy exchange is carried out between line, has both been able to maintain DC bus-bar voltage and has been stablized, has improved the control performance of electric machine controller, and can make electricity
Function amount recycles, and has good economy, and the apparatus structure is simple, production cost is low.
Detailed description of the invention
Fig. 1 is a kind of structure of low-voltage alternating-current electric machine controller over-pressure safety device provided by the embodiment of the utility model
Figure；
Fig. 2 is when a kind of low-voltage alternating-current electric machine controller over-pressure safety device provided by the embodiment of the utility model uses
System connection figure.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
All other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure 1, the utility model embodiment provides a kind of low-voltage alternating-current electric machine controller over-pressure safety device, including
Voltage detecting circuit, voltage control circuit and battery, one of input terminal of the voltage detecting circuit and motor control
The DC bus of the input side of device processed is electrically connected, another input terminal is electrically connected with the both ends of battery, output end with it is described
Voltage control circuit electrical connection, the voltage detecting circuit are used for the DC bus-bar voltage of real-time detection electric machine controller input side
Value and battery both end voltage value, and export to voltage control circuit, the voltage control circuit includes controller and is used for
The first electric switch Q1 for charging a battery of control DC bus and for for controlling that battery discharges to DC bus
Two electric switch Q2, the controller are electrically connected with the first electric switch Q1 and the second electric switch Q2, and the controller is used
In controlling the first electric switch Q1 and described according to the d-c bus voltage value and battery both end voltage value that detect
The opening and closing of two electric switch Q2.Specifically, when controller a certain amount of, and the battery that judges that d-c bus voltage value is greater than standard value
It when both end voltage is less than rated value, controls the first electric switch Q1 and opens the second electric switch Q2 closing, to pass through DC bus to storage
Battery charging, when controller judges that d-c bus voltage value is less than standard value or battery both end voltage greater than rated value,
It controls the second electric switch Q2 and opens the first electric switch Q1 closing, allow battery to discharge to DC bus, when controller judges direct current
When bus voltage value is near standard value, control the first electric switch Q1 and the first electric switch Q1 is turned off, and battery neither charges
Also it does not discharge.
System connection figure when the device uses is as shown in Fig. 2, by using the over-pressure safety device, when motor rapidly stops
When being only in power generation mode, d-c bus voltage value is increased, and the electric energy of motor sending is stored by charging a battery, and is reduced straight
The voltage for flowing bus, to protect electric machine controller；When motor rapidly starts, motor needs bigger electric current, will cause
DC bus-bar voltage slightly falls, and battery can export electric current to DC bus by voltage control circuit at this time, to keep
DC bus-bar voltage is stablized, and the control performance of electric machine controller is improved.
The structure of the voltage detecting circuit is refined, the voltage detecting circuit includes the first differential amplifier circuit and second
Two input terminals of differential amplifier circuit, first difference channel are electrically connected with the positive and negative both ends of the DC bus respectively,
Output end is electrically connected with the controller, two input terminals of second difference channel respectively with the battery positive and negative two
End electrical connection, output end are electrically connected with the controller.First differential amplifier circuit is used to detect the electricity on DC bus
It presses and exports to controller, second differential amplifier circuit is used to detect the voltage at battery both ends and exports to controller.
Specifically, first differential amplifier circuit includes first resistor R1, second resistance R2,3rd resistor R3, the 4th
Resistance R4 and the first amplifier Q1, the positive input terminal of the first amplifier Q1 pass through the second resistance R2 and the direct current
The anode of bus connects, and negative input end is connect by the first resistor R1 with the negative terminal of the DC bus, output end and institute
Controller connection is stated, and by the 3rd resistor R3 connection between negative input end and the output end, positive input terminal also passes through
The 4th resistance R4 ground connection；Second differential amplifier circuit include the 5th resistance R5, the 6th resistance R6, the 7th resistance R7,
The positive input terminal of 8th resistance R8 and the second amplifier Q2, the second amplifier Q2 by the 5th resistance R5 with it is described
The anode of battery connects, and negative input end is connect by the 6th resistance R6 with the negative terminal of the battery, output end and institute
Controller connection is stated, and by the 8th resistance R8 connection between negative input end and the output end, positive input terminal also passes through
The 7th resistance R7 ground connection.
Refine the structure of the voltage control circuit, between the DC bus and the battery by connection at
Charging and discharging circuit, the first electric switch Q1 and the second electric switch Q2 are both connected in the charging and discharging circuit, it is preferable that
The first electric switch Q1 and the second electric switch Q2 is transistor electric switch and the two is connected in inverse parallel, first establishes by cable
When closing Q1 conducting, the second electric switch Q2 closing, DC bus charges a battery, the second electric switch Q2 conducting, the first electric switch
When Q1 is closed, battery discharges to DC bus.It is further preferred that the first electric switch Q1 and the second electric switch Q2
It is N-channel MOS FET.
Preferably, the controller uses microcontroller, for calculating the DC bus electricity of voltage detecting circuit output
Pressure value and battery voltage value, and control the opening and closing of the first electric switch Q1 and the second electric switch Q2.Its control is exemplified below
Mode: the voltage of DC bus is assumed to be DC24V, and over-pressure safety device is connected to the positive and negative both ends of 24V DC bus, battery
Using+26V battery.As voltage V1>=26V on DC bus and battery both end voltage V2<26V, MCU driving the
One electric switch Q1 is connected the second electric switch Q2 and closes, and is charged a battery at this time by DC bus, makes the voltage of DC bus
It drops within 26V, to protect electric machine controller；When V1<24V or V2>=26V, MCU drive the second electric switch Q2 conducting first
Electric switch Q1 is closed, and battery discharges to DC bus at this time, is given electric machine controller electric energy supplement, is maintained DC bus-bar voltage
Stablize；As 24V≤V1 < 26V, MCU driving the first electric switch Q1 and the second electric switch Q2 is turned off, and battery neither charges
It does not discharge, entire over-pressure safety device is in a dormant state.
Wherein the capacity of battery can be selected according to the operating condition of motor rated power and motor operation, motor volume
It is bigger to determine power, motor is in that generating operation mode is more frequent, and selected accumulator capacity is bigger, conversely, accumulator capacity can be appropriate
Reduce.In addition, accumulator super-charge damages in order to prevent, when battery is in full of electricity condition, can control battery actively to
DC bus electric discharge provides energy to electric machine controller.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (6)
1. a kind of low-voltage alternating-current electric machine controller over-pressure safety device, it is characterised in that: controlled including voltage detecting circuit, voltage
Circuit and battery, the DC bus of the input side of one of input terminal and electric machine controller of the voltage detecting circuit
Electrical connection, another input terminal are electrically connected with the both ends of battery, and output end is electrically connected with the voltage control circuit, described
Voltage control circuit includes controller and for controlling the first electric switch that DC bus charges a battery and for being used for
The second electric switch that control battery discharges to DC bus, the controller are established by cable with first electric switch and described second
Powered-down connection.
2. low-voltage alternating-current electric machine controller over-pressure safety device as described in claim 1, it is characterised in that: the DC bus
It is all connected with by connection at charging and discharging circuit, first electric switch and second electric switch between the battery
In the charging and discharging circuit.
3. low-voltage alternating-current electric machine controller over-pressure safety device as claimed in claim 2, it is characterised in that: described first establishes by cable
It closes and second electric switch is transistor electric switch and the two is connected in inverse parallel.
4. low-voltage alternating-current electric machine controller over-pressure safety device as claimed in claim 3, it is characterised in that: described first establishes by cable
It closes and second electric switch is N-channel MOS FET.
5. low-voltage alternating-current electric machine controller over-pressure safety device as described in claim 1, it is characterised in that: the voltage detecting
Circuit include the first differential amplifier circuit and the second differential amplifier circuit, two input terminals of first difference channel respectively with
The positive and negative both ends of the DC bus are electrically connected, and output end is electrically connected with the controller, and two of second difference channel
Input terminal is electrically connected with the positive and negative both ends of the battery respectively, and output end is electrically connected with the controller.
6. low-voltage alternating-current electric machine controller over-pressure safety device as claimed in claim 5, it is characterised in that: first difference
Amplifying circuit includes first resistor, second resistance, 3rd resistor, the 4th resistance and the first amplifier, first amplifier
Positive input terminal connect by the second resistance with the anode of the DC bus, negative input end by the first resistor with
The negative terminal of the DC bus connects, and output end is connect with the controller, and is passed through between negative input end and the output end
The 3rd resistor connection, positive input terminal also pass through the 4th resistance eutral grounding；Second differential amplifier circuit includes the 5th
The positive input terminal of resistance, the 6th resistance, the 7th resistance, the 8th resistance and the second amplifier, second amplifier passes through institute
It states the 5th resistance to connect with the anode of the battery, negative input end is connected by the negative terminal of the 6th resistance and the battery
It connects, output end is connect with the controller, and is connected between negative input end and the output end by the 8th resistance, just defeated
Enter end and also passes through the 7th resistance eutral grounding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822216947.2U CN209217701U (en) | 2018-12-27 | 2018-12-27 | Low-voltage alternating-current electric machine controller over-pressure safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822216947.2U CN209217701U (en) | 2018-12-27 | 2018-12-27 | Low-voltage alternating-current electric machine controller over-pressure safety device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209217701U true CN209217701U (en) | 2019-08-06 |
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ID=67466371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822216947.2U Active CN209217701U (en) | 2018-12-27 | 2018-12-27 | Low-voltage alternating-current electric machine controller over-pressure safety device |
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| CN (1) | CN209217701U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113013866A (en) * | 2021-03-10 | 2021-06-22 | 杰华特微电子（杭州）有限公司 | Power supply system |
-
2018
- 2018-12-27 CN CN201822216947.2U patent/CN209217701U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113013866A (en) * | 2021-03-10 | 2021-06-22 | 杰华特微电子（杭州）有限公司 | Power supply system |
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