CN216929895U - Servo power-on control circuit - Google Patents
Servo power-on control circuit Download PDFInfo
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- CN216929895U CN216929895U CN202121630185.6U CN202121630185U CN216929895U CN 216929895 U CN216929895 U CN 216929895U CN 202121630185 U CN202121630185 U CN 202121630185U CN 216929895 U CN216929895 U CN 216929895U
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Abstract
The utility model discloses a servo power-on control circuit which comprises a weak current interface and a comparison circuit, wherein a circuit of the comparison circuit is connected with a control relay RL1, and after the comparison circuit judges that weak current voltage input from the weak current interface reaches a set threshold value, the comparison circuit is conducted, so that a coil of the control relay RL1 is connected with a power supply, a normally open contact of the coil is closed, and an upper resistor R3 which is connected in series with the normally open contact of the control relay RL1 is connected. Through the mode, the servo power-on control circuit disclosed by the utility model is used for controlling the servo driver, so that the servo driver can not power on strong electricity when the servo driver does not access the weak electricity, and the safety coefficient of the servo driver is improved.
Description
Technical Field
The utility model relates to the technical field of servo driving motors, in particular to a servo power-on control circuit.
Background
The power supply of most servo drivers usually has strong power of 220V or 380V and weak power of 24V supplied at the same time, the strong power mainly acts on power components such as IGBT (insulated gate bipolar transistor) modules and the like for driving motors, the weak power is used as the power supply of a servo internal control single circuit, if the servo is not powered on by the weak power and the strong power is switched on, the power components such as the IGBT modules and the like are in a charged and uncontrolled state, and certain risks and potential safety hazards are caused to the servo drivers.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a servo power-on control circuit which is used for controlling a servo driver, can ensure that the servo driver cannot power on strong electricity when the servo driver does not access the weak electricity, and improves the safety coefficient of the servo driver.
In order to solve the technical problems, the technical scheme provided by the utility model is as follows: a servo power-on control circuit comprises a weak current interface and a comparison circuit, wherein a control relay RL1 is connected to the circuit of the comparison circuit, and after the comparison circuit judges that a weak current voltage input from the weak current interface reaches a set threshold value, the comparison circuit is conducted, so that a coil of the control relay RL1 is connected with a power supply, a normally open contact of the coil is closed, and an upper resistor R3 which is connected in series with the normally open contact of the control relay RL1 is connected.
By adopting the technical scheme, when the weak current voltage is accessed from the weak current interface, the comparison circuit judges whether the weak current voltage reaches the set threshold value, when the weak current voltage reaches the set threshold value and keeps stable, the servo driver is normally accessed to the weak current control power supply, the comparison circuit is conducted at the moment, the coil of the control relay RL1 is conducted to the weak current voltage, the normally open contact is closed, and the upper electric resistor R3 connected with the normally open contact in series is conducted, wherein the upper electric resistor R3 is used for being connected with a strong current charging circuit and is used for charging the energy storage capacitor C1.
Further, the comparison circuit comprises a proportional resistor R1, a proportional resistor R2 and a voltage comparison chip U1, the proportional resistor R1 and the proportional resistor R2 are connected in series and divided and then input into the voltage comparison chip U1 for comparison, when the voltage comparison chip U1 judges that the weak voltage reaches a set threshold value, the voltage comparison chip U1 turns on a coil of the control relay RL1, and a normally open contact of the control relay RL1 pulls in and turns on the upper resistor R3.
Furthermore, one end of the proportional resistor R1 and one end of the proportional resistor R2 are respectively connected with the positive electrode and the negative electrode of the weak current interface, the other end voltages of the proportional resistor R1 and the proportional resistor R2 are connected with the comparison chip U1, and the output end of the voltage comparison chip U1 is connected with the coil of the control relay RL 1. When the voltage comparison chip U1 is conducted, the power supply of the control relay RL1 is connected, so that the control relay RL1 is electrified and attracted, and the normally open contact of the control relay RL1 is closed to conduct the upper resistor R3.
Further, a diode D1 is connected in parallel in reverse to a coil of the control relay RL 1. The coil of the relay is an inductive load, and the diode D1 is connected in parallel in the reverse direction, so that the coil can be prevented from being damaged by the counter electromotive force generated when the control relay RL1 is powered off, and the coil of the relay is protected.
The beneficial effects obtained by the utility model are as follows: through a comparison circuit composed of the voltage comparison chip and the proportional resistor, when weak current is accessed, through comparison and judgment of a set threshold value, after the servo driver is connected with a weak current control power supply, through power-on suction of the control relay, the power-on resistor is connected and used for charging the energy storage capacitor, when charging is completed, the power-on resistor is bypassed, rectified voltage can be converted into strong current through connection with commercial power or through an inverter circuit, and the strong current power supply is provided for the servo driver. According to the servo power-on control circuit, the relay is used for controlling the power-on resistor to intervene in the circuit, the servo power-on function is controlled, the safety sequence that servo is switched in weak current first and then strong current is kept, and the safety use performance of a servo driver is improved.
Drawings
FIG. 1 is a schematic diagram of the circuit configuration of the present invention;
FIG. 2 is a schematic diagram of a strong electric circuit according to the present invention.
Detailed Description
The utility model is further described with reference to the following figures and detailed description.
As shown in FIG. 2, when the strong current circuit of the servo driver starts to be switched on, the utility model controls the upper resistor R3 to be switched in the circuit, and the rectifying circuit is switched on with the upper resistor R3 and the energy storage capacitor C1; when the energy storage capacitor C1 is fully charged, the upper resistor R3 is bypassed, the rectified current flows directly to the inverter circuit, and ac strong current is generated and sent to the servo driver for driving the power equipment. In the present embodiment, the strong current is typically 220V or 380V ac, and the weak current is typically 24V dc.
Referring to fig. 1, the utility model discloses a servo power-on control circuit, which comprises a weak current interface DC and a comparison circuit, wherein a circuit of the comparison circuit is connected with a control relay RL1, and after the comparison circuit judges that the weak current voltage input from the weak current interface DC reaches a set threshold value, the comparison circuit is conducted, so that a coil of the control relay RL1 is connected with a power supply, a normally open contact of the coil is closed, and a power-on resistor R3 connected in series with the normally open contact of the control relay RL1 is connected.
The comparison circuit comprises a proportional resistor R1, a proportional resistor R2 and a voltage comparison chip U1, the proportional resistor R1 and the proportional resistor R2 are connected in series and divided and then input into the voltage comparison chip U1 for comparison, when the voltage comparison chip U1 judges that weak current voltage reaches a set threshold value, the voltage comparison chip U1 conducts a coil of the control relay RL1, and a normally open contact of the control relay RL1 attracts and conducts the upper resistor R3.
One ends of the proportional resistor R1 and the proportional resistor R2 are respectively connected with the positive electrode and the negative electrode of the weak current interface, the other ends of the proportional resistor R1 and the proportional resistor R2 are connected with the comparison chip U1, and the output end of the voltage comparison chip U1 is connected with a coil of the control relay RL 1.
A diode D1 is connected in parallel in reverse to the coil of the control relay RL 1.
When the utility model is implemented specifically, a weak current power supply is connected to a weak current interface DC, voltage is divided by a proportional resistor R1 and a proportional resistor R2, the divided weak current voltage is input by a voltage comparison chip U1, whether the weak current voltage reaches a set threshold value or not is judged, when the weak current voltage reaches the set threshold value, the voltage comparison chip U1 is conducted, and current flows through a coil of a control relay RL1 to enable the coil to generate magnetic force, so that a contact is attracted. After the normally open contact of the control relay RL1 is attracted, the upper resistor R3, the rectifying circuit and the energy storage capacitor C1 form a passage, when the servo driver is connected with strong current, the energy storage capacitor C1 is charged, the upper resistor R3 plays a role in limiting the current in the charging process, and the current at the moment of electrification is prevented from being overlarge.
After the energy storage capacitor C1 is charged, the normally open contact of the drive relay RL2 is controlled to be attracted according to the set software of the servo driver, the normally open contact of the control relay RL1 and the upper electric resistor R3 are bypassed after attraction, when a large load is driven, large voltage drop cannot be generated, and the servo can work normally.
When the weak current power supply is cut off, the control relay RL1 and the driving relay RL2 lose magnetic release contacts due to the loss of electricity of the coils, so that the internal rectification of the servo driver is disconnected with the energy storage capacitor C1 and the inverter circuit at the rear stage, and the connection between the servo driver and the strong current is disconnected.
In summary, the actual samples of the present invention are prepared according to the description and the drawings, and after a plurality of usage tests, the effect of the usage tests proves that the present invention can achieve the expected purpose, and the practical value is undoubted. The above-mentioned embodiments are only for convenience of illustration and not intended to limit the utility model in any way, and those skilled in the art will be able to make equivalents of the features of the utility model without departing from the technical scope of the utility model.
Claims (4)
1. A servo power-on control circuit is characterized in that: the circuit comprises a weak current interface DC and a comparison circuit, wherein a circuit of the comparison circuit is connected with a control relay RL1, and after the comparison circuit judges that a weak current voltage input from the weak current interface DC reaches a set threshold value, the comparison circuit is conducted, so that a coil of the control relay RL1 is connected with a power supply, a normally open contact of the coil is closed, and an upper resistor R3 which is connected in series with the normally open contact of the control relay RL1 is connected.
2. The servo power-on control circuit of claim 1, wherein: the comparison circuit comprises a proportional resistor R1, a proportional resistor R2 and a voltage comparison chip U1, wherein the proportional resistor R1 and the proportional resistor R2 are connected in series and divided and then input into the voltage comparison chip U1 for comparison.
3. The servo power-on control circuit of claim 2, wherein: one end of the proportional resistor R1 and one end of the proportional resistor R2 are respectively connected with the positive electrode and the negative electrode of the weak current interface, the other end voltages of the proportional resistor R1 and the proportional resistor R2 are connected with the comparison chip U1, and the output end of the voltage comparison chip U1 is connected with the coil of the control relay RL 1.
4. The servo power-on control circuit of claim 1, wherein: and a coil of the control relay RL1 is reversely connected with a diode D1 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121630185.6U CN216929895U (en) | 2021-07-16 | 2021-07-16 | Servo power-on control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121630185.6U CN216929895U (en) | 2021-07-16 | 2021-07-16 | Servo power-on control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216929895U true CN216929895U (en) | 2022-07-08 |
Family
ID=82222778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121630185.6U Active CN216929895U (en) | 2021-07-16 | 2021-07-16 | Servo power-on control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216929895U (en) |
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2021
- 2021-07-16 CN CN202121630185.6U patent/CN216929895U/en active Active
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