Quick voltage bleeder circuit and servo driver

Abstract

The utility model provides a voltage rapid bleeder circuit and a servo driver. The voltage rapid bleeder circuit comprises a rectification filtering module and a bleeder module. The input end of the rectifying and filtering module is connected with a power supply, the output end of the rectifying and filtering module is connected with the power conversion module, and the rectifying and filtering module comprises a first rectifier bridge and an electrolytic capacitor; one end of the discharge module is connected with the power supply, the other end of the discharge module is connected with the power conversion module, and the discharge module is also connected with the electrolytic capacitor; wherein when the power supply is powered off, the discharge module discharges the energy stored by the electrolytic capacitor. According to the utility model, when the power supply is powered off, the energy stored by the electrolytic capacitor can be rapidly discharged, and the power-off restart time of the servo driver is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to power control circuit technical field, concretely relates to a voltage fast bleed circuit and servo driver. BACKGROUND

[0002] The internal power supply of the servo driver in the servo system usually includes two power supplies of output power supply and auxiliary power supply, the output power supply is used for power supply for motor, the auxiliary power supply is the internal control power supply of the servo driver, and both the output power supply and the auxiliary power supply need capacitor to carry out voltage stabilizing filtering. At present, the capacitor in the output power supply needs to bear larger current, therefore, usually larger capacity capacitor is adopted, and the larger capacity capacitor can lead to the longer power-off time of the servo driver in the power-off restart process, and further lead to the longer restart time of the servo driver. SUMMARY

[0003] The utility model provides a kind of voltage fast bleed circuit and servo driver, to solve the problem of the longer discharge time of current servo driver in the power-off restart process.

[0004] Firstly, the utility model provides a kind of voltage fast bleed circuit, it includes rectification filter module and bleed module;The input end of the rectification filter module is connected with power supply, its output end is connected with power conversion module, and the rectification filter module includes first rectifier bridge and electrolytic capacitor;One end of the bleed module is connected with the power supply, and the other end is connected with the power conversion module, and the bleed module is also connected with the electrolytic capacitor;Wherein, when the power supply is powered off, the bleed module discharges the energy stored in the electrolytic capacitor.

[0005] Further, the rectification filter module further includes start-up circuit, and the start-up circuit includes the electrolytic capacitor, and the electrolytic capacitor is connected with the first rectifier bridge, the power conversion module and the bleed module respectively.

[0006] Further, the start-up circuit further includes current-limiting circuit;One end of the current-limiting circuit is connected with the electrolytic capacitor, and the other end of the current-limiting circuit is connected with the power conversion module.

[0007] Further, the current-limiting circuit includes current-limiting resistor and first relay;One end of the current-limiting resistor and the normally open end of the first relay are connected with the electrolytic capacitor, the other end of the current-limiting resistor is grounded, and one end of the coil of the first relay is connected with the first output end of the power conversion module, and the other end of the coil of the first relay is grounded.

[0008] Further, the bleeder module comprises a light load rectifier circuit, a direct current output circuit, a power-off detection circuit and a switch circuit; an input end of the light load rectifier circuit is connected with the power supply, an output end of the light load rectifier circuit is connected with an input end of the direct current output circuit, an output end of the direct current output circuit is connected with the power-off detection circuit, the power-off detection circuit is connected with the power supply conversion module and the switch circuit respectively, and the switch circuit is further connected with the electrolytic capacitor.

[0009] Further, the direct current output circuit comprises a first capacitor, a first resistor, a second resistor and a third resistor; one end of the first capacitor, one end of the first resistor and one end of the second resistor are connected with the output end of the light load rectifier circuit, the other end of the second resistor is connected with one end of the third resistor and the power-off detection circuit respectively, and the other end of the first capacitor, the other end of the first resistor and the other end of the third resistor are grounded.

[0010] Further, the power-off detection circuit comprises an optoelectronic coupler, an optical input end of the optoelectronic coupler is connected with the output end of the direct current output circuit, and optical output ends of the optoelectronic coupler are connected with the power supply conversion module and the switch circuit respectively.

[0011] Further, the switch circuit comprises a first switch tube, a second switch tube, a second relay, a first diode and a fourth resistor; a first pole of the first switch tube is used for being connected with a first output end of the power supply conversion module, a second pole of the first switch tube is connected with one end of a coil of the second relay, a controlled pole of the first switch tube is connected with a negative pole of the first diode, a positive pole of the first diode is connected with a first pole of the second switch tube, the first pole of the second switch tube is further connected with a second output end of the power supply conversion module, a second pole of the second switch tube is grounded, and a controlled pole of the second switch tube is connected with the optical output end of the optoelectronic coupler connected with the power-off detection circuit; the other end of the coil of the second relay is grounded, a normally open end of the second relay is connected with the electrolytic capacitor, one end of the fourth resistor is connected with the optical output end of the optoelectronic coupler, and the other end of the fourth resistor is grounded.

[0012] Further, the light load rectifier circuit comprises a phase load and a second rectifier bridge; an input end of the phase load is used for being connected with the power supply, an output end of the phase load is connected with an input end of the second rectifier bridge, and an output end of the second rectifier bridge is connected with the direct current output circuit.

[0013] In the second aspect, the utility model also provides a kind of servo driver, it includes the voltage fast bleeder circuit of any one described above.

[0014] The utility model discloses a voltage quick bleed circuit and servo driver, servo driver includes voltage quick bleed circuit, and voltage quick bleed circuit includes rectification filter module and bleeds the module, and rectification filter module is connected with power supply and power conversion module respectively, and rectification filter module includes first rectifier bridge and electrolytic capacitor, simultaneously, bleeds the module and electrolytic capacitor are connected, when the power supply is powered off, the energy stored in electrolytic capacitor can be carried out quick bleeds through bleeds the module, and then shortens the bleeds time of servo driver, thereby reduces the power -off restart time of servo driver. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced the drawing needed to be used in the embodiment description, obviously, the drawing in the following description is some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0016] Figure 1 It is the block schematic diagram of voltage quick bleed circuit provided by the first embodiment of the utility model;

[0017] Figure 2 It is the block schematic diagram of voltage quick bleed circuit provided by the second embodiment of the utility model;

[0018] Figure 3 It is the block schematic diagram of voltage quick bleed circuit provided by the third embodiment of the utility model;

[0019] Figure 4 It is the circuit diagram of voltage quick bleed circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without making creative labor are within the protection scope of the utility model.

[0021] It should be understood that, when using in the specification and the appended claims, the terms "include" and "contain" indicate the existence of the described features, whole, operation, element and / or component, but do not exclude the existence or addition of one or more other features, whole, operation, element, component and / or its set.

[0022] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification of the present application and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should be further understood that the term "and / or" used in the specification of the present application and the appended claims means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0023] In addition, the direction terms mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side" and the like, are only for the purpose of referring to the direction of the attached drawings and the state of use of the product. Therefore, the direction terms used are for the purpose of description and understanding of the present application, and are not intended to limit the present application. In addition, in the drawings, structures similar or identical in structure are denoted by the same reference numerals.

[0024] Referring to Figures 1 to 4 , Figure 1 is a block schematic diagram of a voltage fast discharge circuit 100 provided by the first embodiment of the present application; Figure 2 is a block schematic diagram of a voltage fast discharge circuit 100 provided by the second embodiment of the present application; Figure 3 is a block schematic diagram of a voltage fast discharge circuit 100 provided by the third embodiment of the present application; Figure 4 is a circuit diagram of a voltage fast discharge circuit 100 provided by an embodiment of the present application. As shown in Figure 1 , the voltage fast discharge circuit 100 includes a rectification and filtering module 10 and a discharge module 20; the input end of the rectification and filtering module 10 is connected with a power supply 200, the output end thereof is connected with a power conversion module 300, and the rectification and filtering module 10 includes a first rectification bridge 11 and an electrolytic capacitor 121; one end of the discharge module 20 is connected with the power supply 200, the other end thereof is connected with the power conversion module 300, and the discharge module 20 is further connected with the electrolytic capacitor 121; wherein, when the power supply 200 is powered off, the discharge module 20 discharges the energy stored in the electrolytic capacitor 121.

[0025] Specifically, the voltage fast discharge circuit 100 can include a rectification and filtering module 10 and a discharge module 20, the input end of the rectification and filtering module 10 is connected with a power supply 200 for providing alternating current, then the rectification and filtering module 10 is used to rectify the alternating current output by the power supply 200 to obtain direct current, at the same time, the output end of the rectification and filtering module 10 is also connected with a power conversion module 300, for outputting the direct current to the power conversion module 300.

[0026] The rectification filter module 10 can include a first rectification bridge 11 and an electrolytic capacitor 121, an input end of the first rectification bridge 11 is connected with the power supply 200, an output end of the first rectification bridge 11 is connected with the electrolytic capacitor 121, for rectifying the alternating current output by the power supply 200 into direct current and outputting to the electrolytic capacitor 121, that is, when powered on, the power supply 200 charges the electrolytic capacitor 121 through the first rectification bridge 11, and when the electrolytic capacitor 121 is fully charged, the electrolytic capacitor 121 discharges and supplies power to the power conversion module 300.

[0027] One end of the bleeder module 20 is connected with the power supply 200 and powered by the power supply 200, the other end of the bleeder module 20 is connected with the power conversion module 300, for detecting whether the power supply 200 is powered off, and at the same time, the bleeder module 20 is also connected with the electrolytic capacitor 121, for bleeding off the energy of the electrolytic capacitor 121.

[0028] When the power supply 200 is working normally, the bleeder module 20 does not work, the power supply 200 charges the electrolytic capacitor 121 through the first rectification bridge 11, and the electrolytic capacitor 121 normally supplies power to the power conversion module 300 after being fully charged, when the power supply 200 is powered off, the bleeder module 20 can detect that the power supply 200 has been powered off, then the bleeder module 20 starts to work normally and communicates with the electrolytic capacitor 121, after the bleeder module 20 communicates with the electrolytic capacitor 121, the energy of the electrolytic capacitor 121 can be quickly bled off through the bleeder module 20, so as to shorten the bleeder time, and further shorten the restart time of the servo driver.

[0029] As one of the embodiments, the rectification filter module 10 further includes a starting circuit 12, the starting circuit 12 includes the electrolytic capacitor 121, the electrolytic capacitor 121 is connected with the first rectification bridge 11, the power conversion module 300 and the bleeder module 20 respectively.

[0030] The rectification filter module 10 can include a starting circuit 12, the starting circuit 12 includes the electrolytic capacitor 121, the electrolytic capacitor 121 is connected with the first rectification bridge 11, the power supply 200 charges the electrolytic capacitor 121 through the first rectification bridge 11, the electrolytic capacitor 121 is connected with the power conversion module 300, and the electrolytic capacitor 121 supplies power to the power conversion module 300. At the same time, the electrolytic capacitor 121 is also connected with the bleeder module 20, when the power supply 200 normally supplies power, the electrolytic capacitor 121 does not communicate with the bleeder module 20, when the power supply 200 is powered off, the bleeder module 20 works, then the electrolytic capacitor 121 communicates with the bleeder module 20, and the energy in the electrolytic capacitor 121 is quickly bled off through the bleeder module 20.

[0031] As Figure 4As shown, Figure 4 The electrolytic capacitor 121 is connected to the output end of the first rectifier bridge 11 and the power input end of the controller U1, and is also connected in parallel with the discharge module 20. When the power supply 200 is powered off, the electrolytic capacitor 121 is connected to the discharge module 20, and the energy of the electrolytic capacitor 121 is quickly discharged through the discharge module 20. Figure 4 The electrolytic capacitor 121 is connected to the output end of the first rectifier bridge 11 and the power input end of the controller U1, and is also connected in parallel with the discharge module 20. When the power supply 200 is powered off, the electrolytic capacitor 121 is connected to the discharge module 20, and the energy of the electrolytic capacitor 121 is quickly discharged through the discharge module 20.

[0032] As one of the embodiments, the starting circuit 12 further comprises a current limiting circuit 121, one end of the current limiting circuit 121 is connected to the electrolytic capacitor 121, and the other end of the current limiting circuit 121 is connected to the power conversion module 300. Figure 2 The starting circuit 12 can comprise an electrolytic capacitor 121 and a current limiting resistor RS, one end of the electrolytic capacitor 121 is connected to the first rectifier bridge 11 and the power conversion module 300, and the other end of the electrolytic capacitor 121 is connected to the current limiting circuit 121, and the current limiting circuit 121 is also connected to the power conversion module 300. When powered on, the current limiting circuit 121 is used to suppress the charging current of the electrolytic capacitor 121, and when the power conversion module 300 works normally, the current limiting circuit 121 is used to reduce the impedance of the electrolytic capacitor 121 and increase the charging current, so as to reduce the charging time of the electrolytic capacitor 121, and further improve the power-on speed of the servo driver.

[0033] As one of the embodiments, the current limiting circuit 121 comprises a current limiting resistor RS and a first relay K1, one end of the current limiting resistor RS and the normally open end of the first relay K1 are connected to the electrolytic capacitor 121, the other end of the current limiting resistor RS is grounded, and one end of the coil of the first relay K1 is connected to the first output end of the power conversion module 300, and the other end of the coil of the first relay K1 is grounded.

[0034] Figure 4

[0035] ​​The current-limiting circuit 121 can include a current-limiting resistor RS and a first relay K1, the current-limiting resistor RS is connected in parallel with the first relay K1, one end of the current-limiting resistor RS and the normally open end of the first relay K1 are both connected with the electrolytic capacitor 121, and the other end of the current-limiting resistor RS is grounded. When powered on, the normally open end of the first relay K1 is in an open state, and the current-limiting resistor RS is used to suppress the charging current of the electrolytic capacitor 121 until the power conversion module 300 works normally. After the power conversion module 300 works normally, the normally open end of the first relay K1 is closed, the current-limiting resistor RS is short-circuited, thereby reducing the impedance of the branch of the electrolytic capacitor 121, the charging current of the electrolytic capacitor 121 is increased, and the charging time of the electrolytic capacitor 121 can be reduced.

[0036] As shown in Figure 4 The coil of the first relay K1 is connected with the first output end VREF of the controller U1 of the power conversion module 300, the normally open end of the first relay K1 is connected in parallel with the current-limiting resistor RS, and the normally open end of the first relay K1 and the current-limiting resistor RS are both connected with the capacitor C. When powered on, the controller U1 outputs a low level, the normally open end of the first relay K1 is in an open state, and the current-limiting resistor RS suppresses the charging current of the capacitor C. When the controller U1 works normally, the controller U1 outputs a high level, the normally open end of the first relay K1 is closed, the current-limiting resistor RS is short-circuited, and the charging current of the electrolytic capacitor 121 is increased.

[0037] As one of the embodiments, the bleed module 20 includes a light load rectifier circuit 21, a direct current output circuit 22, a power-off detection circuit 23, and a switch circuit 24. The input end of the light load rectifier circuit 21 is connected with the power supply 200, the output end of the light load rectifier circuit 21 is connected with the input end of the direct current output circuit 22, the output end of the direct current output circuit 22 is connected with the power-off detection circuit 23, the power-off detection circuit 23 is connected with the power conversion module 300 and the switch circuit 24 respectively, and the switch circuit 24 is further connected with the electrolytic capacitor 121.

[0038] The bleed module 20 can include a light load rectifier circuit 21, a direct current output circuit 22, a power-off detection circuit 23, and a switch circuit 24. The input end of the light load rectifier circuit 21 is connected with the power supply 200, for rectifying the alternating current output by the power supply 200 to obtain direct current, and for reducing the current output by the power supply 200 to provide smaller direct current for the direct current output circuit 22.

[0039] The direct current output circuit 22 is connected with the output end of the light load rectifier circuit 21, for providing smooth direct current output for the power-off detection circuit 23, the power-off detection circuit 23 is connected with the power conversion module 300 and the switch circuit 24, the switch circuit 24 is connected with the power conversion module 300 and the electrolytic capacitor 121 respectively. The power-off detection circuit 23 is used for detecting whether the power supply 200 is powered off, when the power supply 200 is powered off, the switch circuit 24 is turned on, and the electrolytic capacitor 121 is provided with a discharge path. It can be understood that the power-off detection circuit 23 is connected with the power conversion module 300 for detecting whether the power supply 200 is powered off, which can be configured as when the power supply 200 is working normally, the power-off detection circuit 23 is turned on, and the switch circuit 24 is not turned on, when the power supply 200 is powered off, the power-off detection circuit 23 is not turned on, and the switch circuit 24 is turned on, or it can be configured as when the power supply 200 is working normally, the power-off detection circuit 23 is not turned on, and the switch circuit 24 is not turned on, when the power supply 200 is powered off, the power-off detection circuit 23 is turned on, and the switch circuit 24 is turned on.

[0040] In actual use, when powered on, the power supply 200 provides alternating current for the first rectifier bridge 11 and the light load rectifier circuit 21 respectively, the first rectifier bridge 11 rectifies the alternating current to charge the electrolytic capacitor 121, and the light load rectifier circuit 21 rectifies the alternating current while reducing the current output by the power supply 200 to provide smaller direct current for the direct current output circuit 22. If the power supply 200 is working normally, the power-off detection circuit does not detect that the power supply 200 is powered off, and the switch circuit 24 is not turned on, when the power supply 200 is powered off, the power-off detection circuit detects that the power supply 200 is powered off, and the switch circuit 24 is turned on, and the electrolytic capacitor 121 is discharged through the switch circuit 24.

[0041] Referring to Figure 4 , as one of the embodiments, the direct current output circuit 22 includes a first capacitor C1, a first resistor R1, a second resistor R2 and a third resistor R3; one end of the first capacitor C1, one end of the first resistor R1 and one end of the second resistor R2 are connected with the output end of the light load rectifier circuit 21, the other end of the second resistor R2 is connected with one end of the third resistor R3 and the power-off detection circuit 23 respectively, and the other end of the first capacitor C1, the other end of the first resistor R1 and the other end of the third resistor R3 are grounded.

[0042] The direct current output circuit 22 comprises a first capacitor C1, a first resistor R1, a second resistor R2 and a third resistor R3. The first capacitor C1 is connected to the output end of the light load rectifier circuit 21, for providing a smooth direct current voltage to prevent power-off false detection caused by unstable voltage. One end of the first resistor R1 and one end of the second resistor R2 are both connected to the first capacitor C1. The other end of the second resistor R2 is connected to the third resistor R3 and the power-off detection circuit 23 respectively, for providing a suitable conduction current for the power-off detection circuit 23. The resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 can be adjusted to adapt to different types of power-off detection circuit 23.

[0043] As one of the embodiments, the power-off detection circuit 23 comprises an optoelectronic coupler OP1. The light input end of the optoelectronic coupler OP1 is connected to the output end of the direct current output circuit 22. The light output end of the optoelectronic coupler OP1 is connected to the power supply conversion module 300 and the switch circuit 24 respectively.

[0044] As shown in Figure 4 The power-off detection circuit 23 can comprise an optoelectronic coupler OP1. The light input end of the optoelectronic coupler OP1 is connected to the output end of the direct current output circuit 22 and is powered by the direct current output circuit 22. The light output end of the optoelectronic coupler OP1 is connected to the power supply conversion module 300 and the switch circuit 24 respectively. Specifically, one pin of the light output end of the optoelectronic coupler OP1 is connected to the first output end VREF of the controller U1 of the power supply conversion module 300, and the other pin is connected to the switch circuit 24.

[0045] In use, if the power supply 200 does not occur power-off, the optoelectronic coupler OP1 normally conducts, and the power voltage of the first output end VREF of the controller U1 controls the switch circuit 24 not to conduct through the optoelectronic coupler OP1. If the power supply 200 occurs power-off, the optoelectronic coupler OP1 normally does not conduct, and the switch circuit 24 conducts, and the energy of the electrolytic capacitor 121 can be discharged through the switch circuit 24.

[0046] Referring to Figure 4As one of the embodiments, the switch circuit 24 comprises a first switch tube Q1, a second switch tube Q2, a second relay K2, a first diode D1 and a fourth resistor R4. The first pole of the first switch tube Q1 is connected with the first output end of the power conversion module 300, the second pole of the first switch tube Q1 is connected with one end of the coil of the second relay K2, the controlled pole of the first switch tube Q1 is connected with the negative pole of the first diode D1, the positive pole of the first diode D1 is connected with the first pole of the second switch tube Q2, the first pole of the second switch tube Q2 is also connected with the second output end of the power conversion module 300, the second pole of the second switch tube Q2 is grounded, and the controlled pole of the second switch tube Q2 is connected with the light output end of the photoelectric coupler OP1. The other end of the coil of the second relay K2 is grounded, the normally open end of the second relay K2 is connected with the electrolytic capacitor 121, one end of the fourth resistor R4 is connected with the light output end of the photoelectric coupler OP1, and the other end of the fourth resistor R4 is grounded.

[0047] The switch circuit 24 comprises a first switch tube Q1, a second switch tube Q2, a second relay K2, a first diode D1 and a fourth resistor R4. The controlled poles of the second switch tube Q2 and the fourth resistor R4 are both connected with the photoelectric coupler OP1. Meanwhile, the first pole of the first switch tube Q1 is connected with the first output end VREF of the controller U1 of the power conversion module 300, the controlled pole of the first switch tube Q1 is connected with the negative pole of the first diode D1, the positive pole of the first diode D1 is connected with the second output end COMP of the controller U1 of the power conversion module 300, the second pole of the first switch tube Q1 is connected with the coil of the second relay K2, and the normally open end of the second relay K2 is connected with the electrolytic capacitor 121 in parallel. Preferably, the first switch tube Q1 and the second switch tube Q2 are both triodes, and the first diode D1 is a voltage stabilizing diode. The base of the first switch tube Q1 is connected with the first output end VREF of the controller U1 of the power conversion module 300, the emitter of the first switch tube Q1 is connected with the power conversion module 300, the collector of the first switch tube Q1 is connected with the first relay K1, the base of the second switch tube Q2 is connected with the photoelectric coupler OP1, the emitter of the second switch tube Q2 is connected with the second output end COMP of the controller U1 of the power conversion module 300, and the collector of the second switch tube Q2 is grounded.

[0048] When the power supply 200 is normal, the photoelectric coupler OPl is turned on, at this time, the first output end VREF voltage of the controller U1 passes through the photoelectric coupler OPl and generates a DC voltage higher than the COMP pin on the fourth resistor R4, the second switch tube Q2 is not turned on, the second output end COMP voltage of the controller U1 remains normal, and the controller U1 normally works.

[0049] Referring to Figure 4 As one of the embodiments, the light load rectifier circuit 21 comprises a phase load M2 and a second rectifier bridge M3; the input end of the phase load M2 is used for being connected with the power supply 200, the output end of the phase load M2 is connected with the input end of the second rectifier bridge M3, and the output end of the second rectifier bridge M3 is connected with the DC output circuit 22.

[0050] The light load rectifier circuit 21 can comprise the phase load M2 and the second rectifier bridge M3, the input end of the phase load M2 is connected with the power supply 200, the output end of the phase load M2 is connected with the second rectifier bridge M3, and the second rectifier bridge M3 is connected with the DC output circuit 22. The phase load M2 is connected with the power supply 200 and is used for reducing the current output by the power supply 200, the second rectifier bridge M3 is connected with the phase load M2 and is used for rectifying the alternating current output by the phase load M2 to provide the DC current for the DC output circuit 22.

[0051] The utility model discloses still provide a kind of servo driver, the servo driver includes the voltage quick discharge circuit 100 described in any one of the above embodiments.

[0052] The voltage quick discharge circuit and the servo driver provided by the utility model, the rectification filter module is connected with the power supply and the power conversion module respectively, and the rectification filter module includes a first rectifier bridge and an electrolytic capacitor.

[0053] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be encompassed within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A voltage-quick-discharge circuit, characterized by comprising: The voltage quick discharge circuit comprises: a rectification filter module, an input end of the rectification filter module being connected with a power supply, an output end of the rectification filter module being connected with a power conversion module, and the rectification filter module comprising a first rectification bridge and an electrolytic capacitor; a discharge module, one end of the discharge module being connected with the power supply, the other end of the discharge module being connected with the power conversion module, and the discharge module being further connected with the electrolytic capacitor; wherein, when the power supply is powered off, the discharge module discharges the energy stored in the electrolytic capacitor.

2. The voltage-quick-discharge circuit according to claim 1, characterized by, The rectification filter module further comprises a starting circuit, the starting circuit comprising the electrolytic capacitor, the electrolytic capacitor being connected with the first rectification bridge, the power conversion module and the discharge module respectively.

3. The voltage-quick-discharge circuit according to claim 2, characterized by, The starting circuit further comprises a current limiting circuit; one end of the current limiting circuit being connected with the electrolytic capacitor, the other end of the current limiting circuit being connected with the power conversion module.

4. The voltage-quick-discharge circuit according to claim 3, characterized by, The current limiting circuit comprises a current limiting resistor and a first relay; one end of the current limiting resistor and the normally open end of the first relay being connected with the electrolytic capacitor, the other end of the current limiting resistor being grounded, and one end of the coil of the first relay being connected with the first output end of the power conversion module, the other end of the coil of the first relay being grounded.

5. The voltage-quick-discharge circuit according to claim 1, wherein The discharge module comprises a light load rectification circuit, a direct current output circuit, a power-off detection circuit and a switching circuit; an input end of the light load rectification circuit being connected with the power supply, an output end of the light load rectification circuit being connected with an input end of the direct current output circuit, an output end of the direct current output circuit being connected with the power-off detection circuit, the power-off detection circuit being connected with the power conversion module and the switching circuit respectively, and the switching circuit being further connected with the electrolytic capacitor.

6. The voltage-quick-discharge circuit according to claim 5, wherein The direct current output circuit comprises a first capacitor, a first resistor, a second resistor and a third resistor; one end of the first capacitor, one end of the first resistor and one end of the second resistor being connected with the output end of the light load rectification circuit, the other end of the second resistor being connected with one end of the third resistor and the power-off detection circuit respectively, and the other end of the first capacitor, the other end of the first resistor and the other end of the third resistor being grounded.

7. The voltage-quick-discharge circuit according to claim 5, wherein The power-off detection circuit comprises an optoelectronic coupler, an optical input end of the optoelectronic coupler being connected with the output end of the direct current output circuit, and optical output ends of the optoelectronic coupler being connected with the power conversion module and the switching circuit respectively.

8. The voltage-quick-discharge circuit according to claim 7, characterized by, The switching circuit comprises a first switch tube, a second switch tube, a second relay, a first diode and a fourth resistor; The first pole of the first switch tube is used for connecting with the first output end of the power conversion module, one end of the coil of the second relay is connected with the second pole of the first switch tube, the controlled pole of the first switch tube is connected with the negative pole of the first diode, the positive pole of the first diode is connected with the first pole of the second switch tube, the first pole of the second switch tube is also connected with the second output end of the power conversion module, the second pole of the second switch tube is grounded, and the controlled pole of the second switch tube is connected with the light output end of the photoelectric coupler; the other end of the coil of the second relay is grounded, and the normally open end of the second relay is connected with the electrolytic capacitor; one end of the fourth resistor is connected with the light output end of the photoelectric coupler, and the other end of the fourth resistor is grounded.

9. The voltage-quick-discharge circuit according to claim 5, wherein The light load rectification circuit comprises a phase load and a second rectification bridge. The input end of the phase load is used for connecting with the power supply, the output end of the phase load is connected with the input end of the second rectification bridge, and the output end of the second rectification bridge is connected with the direct current output circuit.

10. A servo driver, characterized in that, The voltage fast discharge circuit comprises the light load rectification circuit and the direct current output circuit. The voltage fast discharge circuit comprises the light load rectification circuit and the direct current output circuit.

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