CN203787352U - Relay drive circuit - Google Patents
Relay drive circuit Download PDFInfo
- Publication number
- CN203787352U CN203787352U CN201420108922.XU CN201420108922U CN203787352U CN 203787352 U CN203787352 U CN 203787352U CN 201420108922 U CN201420108922 U CN 201420108922U CN 203787352 U CN203787352 U CN 203787352U
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- Prior art keywords
- relay
- drive circuit
- switching tube
- diode
- relay drive
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- WYROLENTHWJFLR-ACLDMZEESA-N queuine Chemical compound C1=2C(=O)NC(N)=NC=2NC=C1CN[C@H]1C=C[C@H](O)[C@@H]1O WYROLENTHWJFLR-ACLDMZEESA-N 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract 2
- 238000004353 relayed correlation spectroscopy Methods 0.000 abstract 1
- 235000014676 Phragmites communis Nutrition 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 2
- 238000012938 design process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Relay Circuits (AREA)
Abstract
The utility model provides a relay drive circuit. The relay drive circuit comprises an input resistor R, a switch tube Q and a relay RELAY, and is characterized by also comprising a blocking capacitor C and a diode D1, wherein the blocking capacitor is arranged between the input resistor R and the base electrode of the switch tube Q, the cathode of the diode D1 is connected with the base electrode of the switch tube Q, and the anode of the diode D1 is grounded. On the premise that stable work of the relay is ensured, the relay drive circuit can reduce the driving loss of the relay and prolong the service life of the relay; and the capabilities of resisting interference and protecting switch devices of the relay drive circuit can be effectively enhanced, and especially, the self-protection capability and reliability under a severe condition are improved.
Description
Technical field
The utility model relates to electric and electronic technical field, relates in particular to a kind of relay drive circuit.
Background technology
At present, relay as one by weak electric signal control forceful electric power signaling switch element, high with reliability, the advantages such as electrical isolation can be provided and be widely used in the field such as power electronics, energy transformation.Relay kind is a lot, but operation principle is roughly the same.Set forth its operation principle below as an example of open type relay example: generally, relay one end is the magnetic material that multiturn coil is wound around, the other end is many group contact reed, in coil, there is electric current to flow through and just can produce electromagnetic attraction, when electromagnetic attraction between reed is greater than mechanical stress, reed is adhesive just; In like manner, while not existing electromagnetic attraction or electromagnetic attraction to be less than mechanical stress between reed, reed is just thrown off.In fact, when relay is converted to attracting state from disengaged condition, owing to there is certain distance between reed, spring stress is very large, therefore needs larger electric current just can make reed adhesive; Afterwards, contact spacing, from very little, maintain attracting state, only needs the less electric current that maintains.So, in the time maintaining relay attracting state, can suitably turn the driving voltage of coil down.
Control hardware as shown in Figure 1 now, the mode of DRIVE end output PWM ripple is carried out control relay operating state, specific works process is: DRIVE end is first exported high level, makes the effective ON time long enough of switching tube Q, and relay is converted to attracting state by off-state; Then export the PWM ripple of certain duty ratio, to reduce coil stimulating electric current, maintain relay attracting state; In the time that needs relay disconnects, DRIVE holds output low level.
But, in the design process that realizes described drive circuit, inventor finds that in prior art, at least there are the following problems: when prior art repeat circuit is operated in the industry spot of electromagnetic environment complexity, low frequency or direct current interference signal enter drive circuit from DRIVE end affects the normal use of relay, thereby causes whole system reliability not high.
Utility model content
Embodiment of the present utility model provides a kind of relay drive circuit.For achieving the above object, embodiment of the present utility model adopts following technical scheme:
A kind of relay drive circuit that the utility model provides, comprising: input resistance R, switching tube Q, relay R ELAY; It is characterized in that, also comprise: capacitance C and diode D1;
Described capacitance C is arranged between described input resistance R and described switching tube Q base stage; Described diode D1 negative electrode is connected with described switching tube Q base stage; Described diode D1 plus earth.
Wherein, described relay drive circuit also comprises: switching tube protection circuit; Described switching tube protection circuit comprises: diode D2; Described diode D2 negative electrode and direct current in a steady stream VCC are connected, and anode is connected with described switching tube Q collector electrode.
A kind of relay drive circuit that the utility model embodiment provides; Prevent direct current or the interference of low-frequency interference signal to relay by capacitance C is set, can effectively prevent that by switching tube protection circuit is set the coil-induced due to voltage spikes of relay shutdown moment from causing damage to switching tube Q; Adopt the utility model ensureing under the prerequisite of relay working stability; not only can reduce relay driving loss, extend useful life of relay, can also effectively strengthen relay drive circuit antijamming capability and the protective capability to switching device simultaneously, especially improve self-protection ability and the reliability of system in severe situation.
Brief description of the drawings
Fig. 1 is a kind of relay drive circuit figure of the prior art;
A kind of relay drive circuit schematic diagram that Fig. 2 provides for the utility model embodiment;
A kind of relay drive circuit figure that Fig. 3 provides for the utility model embodiment;
Fig. 4 for the utility model embodiment provide in the time that PWM ripple is high level, the signal of relay drive circuit flows to schematic diagram;
Fig. 5 for the utility model embodiment provide in the time that PWM ripple is low level, the signal of relay drive circuit flows to schematic diagram;
A kind of photovoltaic DC-to-AC converter direct current input side and relay drive circuit figure that exchanges outlet side of being applied to that Fig. 6 provides for the utility model embodiment.
Embodiment
A kind of relay drive circuit the utility model embodiment being provided below in conjunction with accompanying drawing is described in detail.
As shown in Figure 2, a kind of relay drive circuit providing for the utility model; This relay drive circuit comprises: comprising: input resistance R, switching tube Q, relay R ELAY; It is characterized in that, also comprise: capacitance C and diode D1;
Described capacitance C is arranged between described input resistance R and described switching tube Q base stage; Described diode D1 negative electrode is connected with described switching tube Q base stage; Described diode D1 plus earth.
It should be noted that, described relay drive circuit can also comprise: switching tube protection circuit; Described switching tube protection circuit comprises: diode D2; Described diode D2 negative electrode and direct current in a steady stream VCC are connected, and anode is connected with described switching tube Q collector electrode.
As shown in Figure 3, a kind of relay drive circuit figure providing for the utility model embodiment; Described relay drive circuit specifically comprises: input resistance R, switching tube Q, relay R ELAY, described capacitance C, diode D1 and diode D2;
Described capacitance C is arranged between described input resistance R and described switching tube Q.
Described diode D1 negative electrode is connected with described switching tube Q base stage, and anode is connected with described switching tube Q emitter; Described diode D2 negative electrode and direct current in a steady stream VCC are connected, and anode is connected with described switching tube Q collector electrode.
The specific works principle of the above relay drive circuit as shown in Figure 4 and Figure 5; The driving signal of described relay drive circuit is the PWM ripple that the duty ratio capable of dynamic that sends of system control chip is adjusted.The concrete driving course of work is as described below: after drive circuit powers on, DRIVE end first sends the PWM ripple that duty ratio is very high, make switching tube Q effective ON time long enough, to be applied to voltage on relay coil enough large, completes the adhesive of relay to produce enough current excitation magnetic field; Then after relay attracting state is stable, turns down DRIVE and hold the electric current that sends PWM ripple duty ratio, reduction coil both end voltage and flow through coil to maintain the attracting state of relay, reduce the energy consumption driving; In the time needing cut-off, directly the duty ratio of PWM ripple is adjusted to 0, now the driving signal of DRIVE end is direct current signal, because electric capacity has isolation characteristic to direct current signal, so can guarantee now can turn-off relay.
(1), when PWM ripple is high level, signal flows to as shown in Figure 4.Q conducting, be GND DRIVE control end power supply, therefore DRIVE port, R, C, Q form the current circuit of driving side jointly, current direction is the left pole plate of right pole plate-Q-GND-DRIVE port-R-C of C, the right pole plate of this process C is by PN junction clamper, voltage is 0.7v left and right, and the left polar plate voltage of C rises gradually, completes capacitor C is charged; VCC, relay, Q, GND form relay and survey current circuit simultaneously, and current direction is VCC-relay coil-Q-GND, and relay relies on this electric current to form magnetic field and ensures relay adhesive;
(2), when PWM ripple is low level, signal flows to as shown in Figure 5.Q turn-offs, D1 conducting, DRIVE port, R, C, D1 form the current circuit of driving side jointly, the right pole plate of the left pole plate-GND-D1-C of current direction: C, the electric energy storing on pole plate when capacitor C is high level by this process by PWM ripple discharges, on electric capacity, energy continues to increase when preventing PWM ripple again as high level, destroys the stable of drive circuit; Relay coil, D2 also form continuous current circuit simultaneously, ensure that on the one hand in relay coil, current circuit is complete, on the other hand, prevent that relay from producing due to voltage spikes while shutoff and Q is caused damage.
This programme makes full use of the isolation characteristic of electric capacity to direct current signal, only has AC signal could drive relay, and direct current signal is all considered as disturbing, and uses electric capacity effectively to isolate it; DRIVE end mistake is sent out high and low level or can rapidly relay be thrown off when badly control chip is out of control in situation, form security protection, prevent uncontrollable expanded range, be incorporated to diode at relay coil two ends, effectively prevent that the coil-induced voltage of relay shutdown moment from causing damage to switching tube simultaneously.
Relay drive circuit the utility model embodiment being provided below in conjunction with accompanying drawing 6 is described in detail.
As shown in Figure 6, be a kind of photovoltaic DC-to-AC converter direct current input side and relay drive circuit that exchanges outlet side of being applied to of the present utility model.
Described photovoltaic DC-to-AC converter comprises that front stage circuits, late-class circuit, CPU detect control circuit.The BOOST booster circuit that front stage circuits is made up of solar cell PV, resistance R 1, relay R ELAY1, inductance L 1, switching tube S1, diode D, capacitor C 1 and corresponding drive circuit; The full-bridge inverting output circuit that late-class circuit is made up of switching tube S2, S3, S4, S5, inductance L 2, resistance R 2, relay R ELAY2, AC network and corresponding drive circuit.
(1) after inverter start, CPU is not first to relay and each switching tube output drive signal, make relay and switching tube in off state, through R2, R1, restriction only has very little current signal to enter inverter to carry out current state detection for CPU alternating current-direct current signal respectively.
(2) normally meet after compressor start up condition until each signal, it is 90% PWM ripple that CPU sends out duty ratio to relay drive circuit, guarantees relay adhesive, exports suitable PWM ripple to each switching tube simultaneously, and inverter is connected to the grid and generates electricity; If CPU does not detect anomaly in 1 minute, relay PWM drives ripple duty ratio to be adjusted to 60%, with energy efficient; Stop if necessary grid-connected fault and occur, CPU stop driver output to relay, stop grid-connected, the safety of protection electrical network and inverter; Do not need to stop grid-connected fault if having and occur, CPU carries out respective handling by pre-provisioning request;
(3) out of control if exist strong jamming to cause CPU, relay is thrown off rapidly, stops grid-connected and inversion output, the safety of protection electrical network and inverter.
A kind of relay drive circuit that the utility model embodiment provides; Prevent direct current or the interference of low-frequency interference signal to relay by capacitance C is set, can effectively prevent that by switching tube protection circuit is set the coil-induced due to voltage spikes of relay shutdown moment from causing damage to switching tube Q; Adopt the utility model ensureing under the prerequisite of relay working stability; not only can reduce relay driving loss, extend useful life of relay, can also effectively strengthen relay drive circuit antijamming capability and the protective capability to switching device simultaneously, especially improve self-protection ability and the reliability of system in severe situation.
The above; it is only embodiment of the present utility model; but protection range of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection range of the present utility model.Therefore, protection range of the present utility model should described be as the criterion with the protection range of claim.
Claims (2)
1. a relay drive circuit, comprising: input resistance R, switching tube Q, relay R ELAY; It is characterized in that, also comprise: capacitance C and diode D1;
Described capacitance C is arranged between described input resistance R and described switching tube Q base stage; Described diode D1 negative electrode is connected with described switching tube Q base stage; Described diode D1 plus earth.
2. relay drive circuit according to claim 1, is characterized in that, described relay drive circuit also comprises: switching tube protection circuit; Described switching tube protection circuit comprises: diode D2; Described diode D2 negative electrode and direct current in a steady stream VCC are connected, and anode is connected with described switching tube Q collector electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420108922.XU CN203787352U (en) | 2014-03-11 | 2014-03-11 | Relay drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420108922.XU CN203787352U (en) | 2014-03-11 | 2014-03-11 | Relay drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203787352U true CN203787352U (en) | 2014-08-20 |
Family
ID=51323511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420108922.XU Expired - Lifetime CN203787352U (en) | 2014-03-11 | 2014-03-11 | Relay drive circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203787352U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105070036A (en) * | 2015-07-29 | 2015-11-18 | 深圳市创荣发电子有限公司 | Infrared study test circuit |
| CN105609371A (en) * | 2015-09-07 | 2016-05-25 | 南京科远驱动技术有限公司 | PWM-wave-controlled electromagnetic relay driving circuit and implementation method |
| US11251699B2 (en) | 2018-06-15 | 2022-02-15 | Samsung Sdi Co., Ltd. | Relay and battery system including the same |
-
2014
- 2014-03-11 CN CN201420108922.XU patent/CN203787352U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105070036A (en) * | 2015-07-29 | 2015-11-18 | 深圳市创荣发电子有限公司 | Infrared study test circuit |
| CN105609371A (en) * | 2015-09-07 | 2016-05-25 | 南京科远驱动技术有限公司 | PWM-wave-controlled electromagnetic relay driving circuit and implementation method |
| US11251699B2 (en) | 2018-06-15 | 2022-02-15 | Samsung Sdi Co., Ltd. | Relay and battery system including the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Beijing Kenaite Technology Co.,Ltd. Assignor: BEIJING DYNAMIC POWER Co.,Ltd. Contract record no.: 2014110000068 Denomination of utility model: Relay drive circuit and relay control method Granted publication date: 20140820 License type: Exclusive License Record date: 20141128 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140820 |