CN201450328U - Power supply protective circuit of engineering machinery controller - Google Patents
Power supply protective circuit of engineering machinery controller Download PDFInfo
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- CN201450328U CN201450328U CN2009200480662U CN200920048066U CN201450328U CN 201450328 U CN201450328 U CN 201450328U CN 2009200480662 U CN2009200480662 U CN 2009200480662U CN 200920048066 U CN200920048066 U CN 200920048066U CN 201450328 U CN201450328 U CN 201450328U
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- circuit
- transient voltage
- power supply
- bidirectional transient
- stage bidirectional
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Abstract
The utility model discloses a power supply protective circuit of an engineering machinery controller, which is characterized by comprising a front stage bidirectional transient voltage suppression diode and a rear stage bidirectional transient voltage suppression diode and a filtering circuit consisting of a common mode choke and a capacitor, wherein two ends of the front stage bidirectional transient voltage suppression diode and the rear stage bidirectional transient voltage suppression diode are respectively connected on the positive electrode and the negative electrode of a power supply in parallel; the common mode choke in the filtering circuit is connected between the front stage bidirectional transient voltage suppression diode and the rear stage bidirectional transient voltage suppression diode in parallel; and the capacitor is connected between the rear stage bidirectional transient voltage suppression diode and a controller in parallel. By the front stage bidirectional transient voltage suppression diode and the rear stage bidirectional transient voltage suppression diode and the filtering circuit consisting of the common mode choke and the capacitor, the power supply protective circuit realizes two-stage two-pole protection to the circuit, and the circuit is restored automatically; and the power supply protective circuit is suitable for field operation of the engineering machinery.
Description
Technical field
The utility model relates to a kind of power protecting circuit, is specifically related to a kind of power protecting circuit of construction machinery controller.
Background technology
For mechanical part, electric controller is the easiest device that disturbed by power supply in the engineering machinery, and electric controller is in the core position of control system, therefore need guarantee its reliability service.Simultaneously, again because the operational environment and the electric characteristic of engineering machinery make its power unit have multiple disturbing factor, these disturb start-stop operation, thunderbolt interference and the static discharge etc. that come from power equipment usually, and glitch almost exists constantly.It is the main cause that causes electric controller to damage that the transition of voltage and electric current is disturbed.
Be the interference that suppresses to exist, adopt circuit as shown in Figure 1 usually, this circuit is connected between DC power supply and the controller, is connected with inductance L by fuse F, again with zener ZD and capacitor C access controller in parallel.Fuse F is used for transient suppression voltage or current interference among the figure, and capacitor C and zener ZD form voltage clamp circuit.Exceed fuse F limit value when interference causes electric current, F will burn with the protection controller.When circuit voltage exceeds the ZD limit value, ZD is with voltage clamp, to guarantee that controller is not damaged by high pressure.
The defective of above-mentioned existing power supply protective circuit clearly, after fuse burnt, circuit can't recover automatically, controller is just no longer worked, and need to change fuse, yet engineer machinery operation usually in the open air, the operation of changing circuit devcie is very inconvenient.In addition, voltage clamp and filtering are unidirectional, when interference comes from load end; this voltage clamp circuit just can't have been handled, and when the back one-level inserted inductive load, this interference very easily occurred; so existing protective circuit is unfavorable for the better protection power supply, need to do further to improve.
Summary of the invention
The utility model purpose provides a kind of power protecting circuit of construction machinery controller, by the improvement to circuit, can protect power supply and controller comprehensively, improves antijamming capability and circuit reliability.
For achieving the above object; the technical solution adopted in the utility model is: a kind of power protecting circuit of construction machinery controller; before comprising; the filter circuit that a back two-stage bidirectional transient voltage suppressing diode and a common mode choke and an electric capacity are formed; before described; the two ends of back two-stage bidirectional transient voltage suppressing diode just are being connected to power supply output respectively; on negative the two poles of the earth; before common mode choke in the described filter circuit is connected to; between the back two-stage bidirectional transient voltage suppressing diode, described electric capacity is connected between back two-way transient voltage suppressing diode of level and the controller.
In the technique scheme; transient voltage suppressing diode (being called for short TVS); under the applied in reverse condition of regulation; when bearing a high-octane instantaneous overvoltage pulse; its working impedance can be reduced to very low conduction value immediately; allow big electric current to pass through; and with voltage clamp to predeterminated level; thereby protect the precision components in the electronic circuit to avoid damaging effectively. after transient pulse finishes; the TVS diode automatically replies high-impedance state; whole loop enters normal voltage. and two-way TVS can absorb instantaneous big pulse power by positive and negative both direction; and voltage clamp to predeterminated level; selected unidirectional TVS in the common DC power supply circuit; only in AC power circuit, adopt two-way TVS; and the utility model has used two-way TVS in the DC power supply protective circuit; accomplish bidirectional protective; when disturbing appears in controller end (inductive load); utilize two-way TVS just can play protection to power supply. the filter circuit of forming by common mode choke and electric capacity; common mode choke also is common mode inductance; be that symmetrical coiling direction is opposite on a closed magnet ring; the coil that the number of turn is identical; direction was opposite when source current flow through in two windings; the magnetic flux that produces is cancelled out each other; choke presents Low ESR; thereby direction is identical when common mode disturbances or noise current are flowed through two windings; produce magnetic flux addition in the same way; choke presents high impedance; thereby play the effect that suppresses common mode disturbances and electrical noise; similar with above-mentioned two-way TVS; usually in DC power supply circuit, adopt common inductance the filtering perception to disturb; adopt common mode choke to substitute common inductance in the utility model; for circuit provides bidirectional protective; prevent the interference that back level load (controller) is sent. during use; the utility model can be made as independent circuit module is connected between power supply and the controller; also can be used as the circuit part of controller; before the utilization; back two-stage bidirectional TVS provides the twin-stage bidirectional protective; improve the reliability of circuit; while TVS self-recovery function; it is unaffected to make engineering machinery grasp industry in the open air, saves and safeguards human cost.
Further technical scheme is, comprises a pair of protective circuit over the ground, and described protective circuit over the ground is made of a piezo-resistance and an electric capacity parallel connection, and two described protective circuits over the ground are connected to respectively between power supply positive and negative electrode output and the ground.The maximum characteristics of piezo-resistance are the voltage when being added in it above when being lower than its threshold values " UN ", and the electric current that flows through it is minimum, is equivalent to one and closes dead valve, when voltage surpasses UN, flows through its electric current surge, is equivalent to valve open.Utilize this function, can suppress the frequent abnormal overvoltage that occurs in the circuit, protective circuit is avoided superpotential infringement.Utilize the combination of piezo-resistance and electric capacity, suppress the situation of transient overvoltages such as lightning overvoltage and switching overvoltage, on the output of positive and negative the two poles of the earth of power circuit, connect this protective circuit over the ground simultaneously respectively, bidirectional protective is provided.
Because the technique scheme utilization, the advantage that the utility model compared with prior art has is:
1, since the filter circuit parallel connection that the utility model is made up of forward and backward two-stage bidirectional transient voltage suppressing diode and common mode choke, electric capacity constitute, utilize the two-way safe voltage value of clamping down on of two-way transient voltage suppressing diode, compare with fuse in the past, two-way transient voltage suppressing diode can automatically reply, after circuit voltage recovered normally, circuit can automatically reply work, need not to change, adapt to the field work of engineering machinery, save and safeguard human cost;
2, forward and backward two-stage bidirectional transient voltage suppressing diode is arranged at the both sides of common mode choke respectively, and twin-stage bidirectional protective design in time suppresses the larger interference that produces in the circuit, improves the reliability of circuit;
3, protective circuit over the ground is set, utilizes the characteristic of piezo-resistance, suppress the situation of transient overvoltages such as lightning overvoltage and switching overvoltage, for circuit provides good overvoltage protection;
4, the two-way transient voltage suppressing diode of employing, common mode choke and branch are connected to the protective circuit over the ground on positive and negative the two poles of the earth; realization is to the bipolar protection of circuit; when disturbing appears in back one-level load (controller),, improve the reliability of entire circuit for circuit provides reverse protection.
Description of drawings
Fig. 1 is the circuit diagram in the background technology;
Fig. 2 is the circuit diagram of the utility model embodiment one.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described:
Embodiment one: referring to shown in Figure 2, a kind of power protecting circuit of construction machinery controller, comprise filter circuit and a pair of protective circuit over the ground that forward and backward two-stage bidirectional transient voltage suppressing diode, a common mode choke T and a capacitor C 3 are formed, the two ends of described forward and backward two-stage bidirectional transient voltage suppressing diode are connected to respectively on positive and negative the two poles of the earth of DC power supply output, and mutation voltage is clamped in safety value; Common mode choke T in the described filter circuit is connected between the forward and backward two-stage bidirectional transient voltage suppressing diode, described capacitor C 3 is connected between back two-way transient voltage suppressing diode D2 of level and the controller, but the common mode disturbances of this filter circuit filter out power and electrical noise; Described protective circuit over the ground is made of a piezo-resistance R and a capacitor C parallel connection, and two described protective circuits over the ground are connected to respectively between power supply positive and negative electrode output and the ground.
During use, the two ends, left side of present embodiment are connected with the both positive and negative polarity of DC power supply respectively, and the right side is connected with controller, realize bipolarly to protection to the two-stage of controller, improve the reliability of protective circuit.
Claims (2)
1. the power protecting circuit of a construction machinery controller; it is characterized in that: comprise the filter circuit that a forward and backward two-stage bidirectional transient voltage suppressing diode and a common mode choke and an electric capacity are formed; the two ends of described forward and backward two-stage bidirectional transient voltage suppressing diode are connected to respectively on positive and negative the two poles of the earth of power supply output; common mode choke in the described filter circuit is connected between the forward and backward two-stage bidirectional transient voltage suppressing diode, and described electric capacity is connected between back two-way transient voltage suppressing diode of level and the controller.
2. the power protecting circuit of construction machinery controller according to claim 1; it is characterized in that: also comprise a pair of protective circuit over the ground; described protective circuit over the ground is made of a piezo-resistance and an electric capacity parallel connection, and two described protective circuits over the ground are connected to respectively between power supply positive and negative electrode output and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200480662U CN201450328U (en) | 2009-08-27 | 2009-08-27 | Power supply protective circuit of engineering machinery controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200480662U CN201450328U (en) | 2009-08-27 | 2009-08-27 | Power supply protective circuit of engineering machinery controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201450328U true CN201450328U (en) | 2010-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200480662U Expired - Fee Related CN201450328U (en) | 2009-08-27 | 2009-08-27 | Power supply protective circuit of engineering machinery controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201450328U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106959407A (en) * | 2017-03-23 | 2017-07-18 | 北京精雕科技集团有限公司 | It is a kind of to improve TVS diode insulation and pressure-resistant filter circuit |
| CN107992143A (en) * | 2018-01-23 | 2018-05-04 | 徐工集团工程机械有限公司 | Multiplexing collection port circuit, controller, analog input acquisition method and system |
-
2009
- 2009-08-27 CN CN2009200480662U patent/CN201450328U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106959407A (en) * | 2017-03-23 | 2017-07-18 | 北京精雕科技集团有限公司 | It is a kind of to improve TVS diode insulation and pressure-resistant filter circuit |
| CN107992143A (en) * | 2018-01-23 | 2018-05-04 | 徐工集团工程机械有限公司 | Multiplexing collection port circuit, controller, analog input acquisition method and system |
| CN107992143B (en) * | 2018-01-23 | 2024-03-01 | 江苏徐工国重实验室科技有限公司 | Multiplexing acquisition port circuit, controller, analog input acquisition method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI HUAXING DIGITAL TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SANY HEAVY MACHINE CO., LTD. Effective date: 20120329 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 215300 SUZHOU, JIANGSU PROVINCE TO: 210200 PUDONG NEW AREA, SHANGHAI |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120329 Address after: 210200 Shanghai, Pudong New Area, Chuansha new town, No. 318, Sichuan Road Patentee after: Shanghai Huaxing Digital Technology Co.,Ltd. Address before: 31 Industrial Park, Songhua River Road, Kunshan Economic Development Zone, Jiangsu, Kunshan 215300, China Patentee before: Sany Heavy Machine Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100505 Termination date: 20140827 |
|
| EXPY | Termination of patent right or utility model |