CN203674080U - Relay drive circuit - Google Patents
Relay drive circuit Download PDFInfo
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- CN203674080U CN203674080U CN201320478947.4U CN201320478947U CN203674080U CN 203674080 U CN203674080 U CN 203674080U CN 201320478947 U CN201320478947 U CN 201320478947U CN 203674080 U CN203674080 U CN 203674080U
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- controlled switch
- voltage
- drive circuit
- coil
- switch element
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Abstract
The utility model brings forward a relay drive circuit comprising at least a controlled switch component and at least a protection circuit, wherein the controlled switch component and a wire coil are connected between a power source and the ground in series, and therefore power supply for the wire coil can be switched on or off. The protection circuit is used for the controlled switch component, and protection circuit is connected between a controlled end of the controlled switch component and a control and input end used for controlling the controlled switch component. When determining that voltage applied on the protection circuit is lower than a preset threshold value, electric connection between the two ends of the controlled switch component is switched off through the protection circuit, and otherwise the electric connection between the two ends of the controlled switch component is switched on through the protection circuit. The preset threshold value is set in such a way that when the control and input end is at an active electric level, the controlled switch component is in a switched-on state; when any control and input end is at a fault electric level, the at least one controlled switch component is in a switched-off state.
Description
Technical field
The utility model relates to relay, relates in particular to a kind of for driving the drive circuit of relay.
Background technology
Relay is the automatic switch element with isolation features, and it is widely used in remote control, remote measurement, communication, control automatically, electromechanical integration and power electronic equipment, is one of most important control element.
For example, protective relaying device has utilized the isolating switch function of relay just, thereby can in power protection system, play vital effect.Particularly, the input such as curtage characteristic, the parameter of user input of relay protection device based on detecting, determines whether current supply line breaks down.If the fault of detecting, protective relaying device makes the actuating of relay, with make to be associated with this protective relaying device and be connected to the circuit breaker tripping in supply line, and thus disconnect for electrical connection, realize protection.In this power protection system, if misoperation appears in protective relaying device, probably cause the having a strong impact on of electric power system, it bring inconvenience not only may to normal system operation, even also may cause larger economic loss.The misoperation of protective relaying device may be caused by many factors, and one of them is to be caused by fault from the processor of action command to this relay that send.
Fig. 1 exemplarily shows a kind of drive circuit 100 of common protective relaying device repeat circuit.As shown in Figure 1, relay R EL_BO comprises a coil COIL and actuator's (output).One end of actuator is common port (COM), and the other end is Chang Kaiduan (NO:Normal Open).In the time that coil COIL does not switch on, COM and NO end remain open, once coil COIL switches on, COM and NO conducting each other, carries out opening operation with the circuit breaker that triggers associated.Coil COIL and one serve as controlled switch element (for example, triode Q102) and are connected between power Vcc and ground GND.Whether whether triode Q102 conducting can be controlled is powered to coil COIL.(base stage b) is controlled by universal input/output (GPIO) end REL_P of a processor (not shown) controlled end of Q102.Resistance R 103 and R104 form a bleeder circuit to REL_P terminal voltage, to keep the base stage of Q102-the penetrate tolerance range that voltage across poles can not exceed Q102.Capacitor C 102 plays the effect of stablizing REL_P level.The setting of capacitor C 102, resistance R 103 and R104 belongs to the common design of triode in this area.According to actual needs, those skilled in the art also can use other similar or conventional design.
In the example shown in Fig. 1, REL_P is the control end that carrys out self processor, also claims control input end, and its significant level is for example high level.In normal operation, REL_P is invalid low level (for example V
l=0), the base stage of Q102-the penetrate cut-in voltage V of voltage across poles lower than Q102
bethereby Q102 is in off-state.In the time that Q102 disconnects, coil COIL no power, COM end and NO end remain open, and then the circuit breaker (not shown) associated with this relay be failure to actuate (for example, keeping conducting), and supply line normally works.In the time breaking down in processor (not shown) discovery supply line, the REL_P control end of processor switches to effective high level (for example V
h=3.3V), thus Q102 conducting, coil COIL energising, and COM end and the NO end of the actuator of REL_BO contact, and then impel associated circuit breaker to carry out and cut off action, and cause line powering interruption.
In the example shown in Fig. 1, if processor self is impaired, the voltage of its output REL_P may be suspended in a fault value, and for example this false voltage for example, neither effective high level (V
h=3.3V) neither be invalid low level (for example V
l=0), but intervenient fault level (for example a, V
f=1.5V).Because this fault level may be higher than the cut-in voltage of Q102, thereby its drive circuit that probably causes relay R EL_BO is unexpectedly triggered, i.e. Q102 conducting, thus cause mistakenly relevant circuit breaker action.
Utility model content
The utility model has been intended to propose a kind of drive circuit for relay, and it can avoid relay misoperation in the time that the control end that carrys out self processor breaks down voltage.
According to embodiment of the utility model, the drive circuit the utility model proposes is for driving a relay.This relay pack vinculum circle, conducting or cut-out are to changeable this relay operating state of the power supply of this coil.Described drive circuit comprises: at least one controlled switch element, and itself and described coil are connected between VDD-to-VSS, the power supply to described coil with conducting or cut-out; At least one protective circuit, one of them protective circuit is for a controlled switch element, the first end of protective circuit is connected to the controlled end of its corresponding controlled switch element, its second end is connected to the control input end for controlling this controlled switch element, if described protective circuit is judged the voltage being applied in described protective circuit lower than a predetermined threshold, disconnect the electrical connection between its first and second end, otherwise electrical connection between its first and second end of conducting; Wherein, described predetermined threshold is arranged in described each control input end in the time of significant level, described controlled switch element is all in conducting state, arbitrary in the time of fault level in each control input end, in described at least one controlled switch element one of at least in dissengaged positions.
Because protective circuit included in the drive circuit the utility model proposes can make to make controlled switch element in off-state while breaking down level in control input end, thereby adopt the drive circuit the utility model proposes can prevent the misoperation to relay causing because of the fault of processor.
According to another embodiment of the utility model, described controlled switch element has cut-in voltage, described predetermined threshold is a value between the first limiting value and the second limiting value, described the first limiting value makes the voltage of the controlled end that is carried in described controlled switch element while being fault level in described control input end just lower than its cut-in voltage, and described the second limiting value is enough to make the voltage of the controlled end that is carried in described controlled switch element while being significant level in described control input end just greater than its cut-in voltage.For example, if described controlled switch element is NPN type triode, described the first limiting value is that maximum fault level value deducts cut-in voltage between the base stage-emitter-base bandgap grading of this NPN type triode; Described the second limiting value is that significant level deducts cut-in voltage between the base stage-emitter-base bandgap grading of this NPN type triode.For another example, if described controlled switch element is positive-negative-positive triode, described the first limiting value is that supply voltage deducts cut-in voltage between emitter-base bandgap grading-base stage that maximum fault level value deducts this positive-negative-positive triode again; Described the second limiting value is that supply voltage deducts cut-in voltage between emitter-base bandgap grading-base stage that significant level deducts this positive-negative-positive triode again.
Thus, adopt the drive circuit the utility model proposes, prevent that relay is misused as long as the predetermined threshold in choose reasonable protective circuit can be realized.
According to another embodiment of the utility model, described protective circuit comprises threshold decision part and controlled switch part.Described controlled switch part connects into for conducting or disconnects the electrical connection between first, second end of described protective circuit, and its controlled end is by the control of described threshold decision part.If judging the voltage being applied in described protective circuit, described threshold decision part exceedes described predetermined threshold, controlled switch part described in conducting, otherwise make described controlled switch part in off-state.Alternatively, protective circuit can comprise at least one Zener diode, the reverse breakdown voltage that described predetermined threshold is described Zener diode.Or described protective circuit can comprise at least one non-Zener diode, described predetermined threshold is the forward conduction voltage sum of each non-Zener diode in described protective circuit.
The drive circuit that employing the utility model proposes, it can realize the object to preventing relay misoperation with simple Zener diode or non-Zener diode, and circuit is simple, cost is low, easily realization.
According to another embodiment of the utility model, the drive circuit of relay comprises two above-mentioned controlled switch elements, and itself and described coil are connected between VDD-to-VSS, the power supply to described coil with conducting or cut-out; Two above-mentioned protective circuits, are connected respectively to described two and award control switch element.Preferably, arbitrary Zener diode that comprises in described two protective circuits, and the described predetermined threshold reverse breakdown voltage that is described Zener diode.Alternatively, in described two protective circuits, any one comprises the two or more non-Zener diode of series connection, and described predetermined threshold is the forward conduction voltage sum of each non-Zener diode in described protective circuit.
Accompanying drawing explanation
The following drawings is only intended to the utility model to schematically illustrate and explain, does not limit scope of the present utility model.Wherein,
Fig. 1 illustrates the schematic diagram of existing relay drive circuit;
Fig. 2 exemplarily illustrates according to the drive circuit of the relay of an embodiment of the utility model;
Fig. 3 exemplarily illustrates according to the drive circuit of the relay of another embodiment of the utility model;
Fig. 4 exemplarily illustrates according to the drive circuit of the relay of another embodiment of the utility model;
Fig. 5 exemplarily illustrates according to the drive circuit of the relay of another embodiment of the utility model.
Embodiment
Understand for technical characterictic of the present utility model, object and effect being had more clearly, now contrast accompanying drawing embodiment of the present utility model is described.
Fig. 2 exemplarily shows according to the drive circuit 200 of the relay of an embodiment of the utility model.In Fig. 2, the element identical with Fig. 1 adopts identical Reference numeral, and its specific descriptions refer to above for purpose of brevity, repeat no more here.
In Fig. 2, different from Fig. 1 is to have increased a protective circuit 210, for prevent misoperation relay R EL_BO in the time that REL_P end breaks down level.These protective circuit 210 one end are connected to REL_P, and the other end is coupled to the controlled end of triode Q102, i.e. base stage b.This protective circuit 210, judging the voltage applying thereon lower than a predetermined threshold, disconnects the electrical connection between its two ends, otherwise electrical connection between its two ends of conducting.Here, this predetermined threshold is arranged in control input end REL_P in the time of significant level, guarantees that Q102 is in conducting state, and during in fault level, makes Q102 keep dissengaged positions at control input end REL_P.
In Fig. 2, also show a specific embodiment of protective circuit 210.As shown in Figure 2, protective circuit 210 specifically comprises a threshold decision part 211 and a controlled switch part 215.Wherein, described controlled switch part 215 connects into for the electrical connection between the two ends of conducting or disconnection protective circuit 210, and the controlled end of controlled switch part 215 is controlled by threshold decision part 211.If judging the voltage being applied in protective circuit 210, threshold decision part 211 exceedes a predetermined threshold, conducting controlled switch part 215, otherwise make controlled switch part 215 in off-state.
In Fig. 2, the selection of the predetermined threshold of protective circuit 210 need to meet following condition;, during in significant level, guarantee that Q102 is in conducting state at control input end REL_P; and during in fault level, make Q102 keep dissengaged positions at control input end REL_P.For example, in Fig. 2, the predetermined threshold Vth of protective circuit 210 need meet following two conditions simultaneously:
1.Vth<V
h-V
be, to guarantee at control input end REL_P as significant level V
htime protective circuit 210 conductings, and the voltage that is carried in the base stage b of Q102 after protective circuit 210 conductings is greater than the cut-in voltage V of Q102
be(for example V
be=0.3V), thus make Q102 conducting.If V
h=3.3V, Vth need to be less than V
h-V
be=3V.
2.Vth>V
f-V
be, to guarantee at control input end REL_P as fault level V
ftime protective circuit 210 disconnect, even or protective circuit 210 be able to conducting, its voltage that is carried in the base stage b of Q102 is also less than the cut-in voltage V of Q102
be(for example V
be=0.3V), thus Q102 is disconnected.If V
f=1.5V, Vth need to be greater than V
f-V
be=1.5V-0.3V=1.2V.
In other words, Vth need meet V
f-V
be<Vth<V
h-V
be, that is, and 1.2V<Vth<3V, for example, preferably Vth=2V, 2.2V or 2.5V.
After the predetermined threshold of protective circuit 210 is so set; if processor is because fault is at REL_P output inactive level or fault level; protective circuit all can disconnect its electrical connection, and and then Q102 is remained open, thereby avoided the infringement that may occur in existing drive circuit.
Fig. 3 exemplarily shows the drive circuit 300 according to the relay of another embodiment of the present utility model.In Fig. 3, the element identical with Fig. 1 or 2 adopts identical Reference numeral, and its specific descriptions refer to above for purpose of brevity, repeat no more here.
In Fig. 3, protective circuit that different from Fig. 2 is is actual comprises a Zener diode D310.Here Zener diode D310 anode is coupled to the base stage of triode Q102, and negative electrode is connected to control input end REL_P.It is consistent with above-mentioned predetermined threshold that the reverse breakdown voltage of D310 is chosen to make it, for example, and the reverse breakdown voltage V of D310
reverse-D310meet too (V
f-V
be) <V
reverse-D310< (V
h-V
be), for example preferred V
reverse-D310=2.5V.When REL_P is significant level V
hwhen=3.3V, D310 two ends pressure drop (=V
h-V
be=3.3V-0.3V=3V) be greater than its reverse breakdown voltage V
reverse-D310=2.5V, Zener diode conducting, and then cause Q102 conducting.Thus coil COIL because of electricly impel actuator's action of threading off.On the contrary, be fault level V at REL_P
fwhen=1.5V, D310 two ends pressure drop (=V
f-V
be=1.5V-0.3V=1.2V) be less than its reverse breakdown voltage V
reverse-D310=2.5V, Zener diode disconnects, and then Q102 remains open state, the different electricity of coil COIL, relay is failure to actuate.
Fig. 4 exemplarily shows the drive circuit 400 according to the relay of another embodiment of the present utility model.In Fig. 4, the element identical with Fig. 1 or 3 adopts identical Reference numeral, and its specific descriptions refer to above for purpose of brevity, repeat no more here.
In Fig. 4, drive circuit 400, except comprising the positive driving circuit section (comprising triode Q102) of similarly being controlled by control input end REL_P (high level is effective) with Fig. 3, also comprises the negative driving circuit section (comprising triode Q101) of being controlled by control input end REL_N (Low level effective).Triode Q101 and Q102 connect with coil COIL, thereby while only having two controlled switch element Q101, the equal conducting of Q102, coil COIL just can switch on.Positive driving circuit section and Fig. 3 are basic identical, and its protective circuit is Zener diode D410-P, act on identically with D310, repeat no more here.
Negative driving circuit section in Fig. 4 is similar with positive driving circuit section, and difference is that Q101 is a positive-negative-positive triode, and its base stage is coupled to control input end REL_N, and its emitter-base bandgap grading is coupled to power Vcc.Protective circuit for Q101 is a Zener diode D410-N.The anodic bonding of Zener diode D410-N is to control input end REL_N, and negative electrode is coupled to the base stage of triode Q101.The reverse breakdown voltage V of D410-N
reverse-D410-Nbe chosen to make it with described predetermined threshold is consistent before.In the example of Fig. 4, if control input end REL_P(high level is effective) and REL_N(Low level effective) while being significant level, the equal conducting of Q101 and Q102.But, in the time of fault, as long as any one remains open can not realize COIL is switched in Q101 and Q102.Thereby in the example shown in Fig. 4, the reverse breakdown voltage of two Zener diodes can be selected according to following condition, that is,
(C1 & C2) & (C3%C4), " & " represents and logic, " % " expression or logic,
Wherein, the reverse breakdown voltage V of C1:D410-N
reverse-D410-N< (V
cC– V
eb-Q101)
The reverse breakdown voltage V of C2:D410-P
reverse-D410-P< (V
h– V
be-Q102)
C3:D410-N reverse breakdown voltage V
reverse-D410-N> (V
cc– V
eb-Q101– V
f)
The reverse breakdown voltage V of C4:D410-P
reverse-D410-P> (V
f– V
be-Q102)
Suppose in the example shown in Fig. 4 Vcc=5V, V
f=1.5V, V
eb=V
be=0.3V, can obtain:
(3.2V<V
reverse-D410-N<4.7V) & (V
reverse-D410-P<3V); Or
(1.2V<V
reverse-D410-P<3V)&(V
reverse-D410-N<4.7V)。
More preferably, the reverse breakdown voltage of D410-N and D410-P meets:
(3.5V<V
reverse-D410-N<4.7V) & (1.2V<V
reverse-D410-P<3V), for example V
reverse-D410-N=3.6V, V
reverse-D410-P=2.5V.
Fig. 5 exemplarily shows the drive circuit 500 according to the relay of another embodiment of the present utility model.In Fig. 5, the element identical with Fig. 4 adopts identical Reference numeral, and its specific descriptions refer to above for purpose of brevity, repeat no more here.Drive circuit 500 in Fig. 5 is similar with Fig. 4; difference is that the protective circuit D510-P of positive driving circuit section (comprising Q102) carrys out the Zener diode in alternate figures 4 by the general-purpose diode of multiple series connection (D513 and D514), and the protective circuit in negative driving circuit section (comprising Q101) is still a Zener diode D510-N.The so-called general-purpose diode here does not have the characteristic of Zener diode, that is, general-purpose diode can not be in conducting state after reverse breakdown, thereby it only has forward conduction voltage V
onD.
Thus, in the example shown in Fig. 5, the reverse breakdown voltage V of Zener diode D510-N
reverse-D510-Nand the number N of general-purpose diode can select according to following condition in D510-P, that is, (D1 & D2) & (D3%D4), " & " represents and logic, " % " expression or logic,
Wherein, the reverse breakdown voltage V of D1:D510-N
reverse-D510-N< (V
cC– V
eb-Q101)
D2: general-purpose diode number N meets, N*V
onD< (V
h– V
be-Q102)
The reverse breakdown voltage V of D3:D510-N
reverse-D510-N> (V
cc– V
eb-Q101– V
f)
D4: general-purpose diode number N meets N*V
onD> (V
f– V
be-Q102)
V
onDfor the forward cut-in voltage of general-purpose diode.
Suppose in the example shown in Fig. 5 Vcc=5V, V
f=1.5V, V
eb=V
be=0.3V, V
onD=0.7V, can obtain:
(3.2V<V
reverse-D510-N<4.7V) & (0<N<4); Or
(1<N<4)&(V
reverse-D510-N<4.7V)。
More preferably, the reverse breakdown voltage of D510-N meets (3.5V<V
reverse-D510-N<4.7V) & (1<N<4), for example V
reverse-D510-N=3.6V, N=2.
Should be appreciated that, the D510-P in Fig. 5 also can correspondingly be used in negative driving circuit section, and D510-N also can replace with the general-purpose diode of some series connection.In addition, the negative driving circuit section (comprising Q101) in Fig. 4 and Fig. 5 also can be used alone as the drive circuit of relay R EL_BO, drive circuit similar to Figure 3.The triode that is used as controlled switch element in above drive circuit also can be substituted by other switch elements, such as field effect transistor etc.
In addition, describe the technical solution of the utility model take normally opened relay REL_BO as example although above, it will be appreciated by persons skilled in the art that the above-mentioned relay drive circuit of mentioning also can be used in the relay of normally closed mode.And the drive circuit the utility model proposes not only can be applied in relay protection device, can also be applied in other and carry out with processor the occasion that control relay moves, for example apparatus of electrical monitoring equipment, or other have in the device of relay output.
Be to be understood that, although this specification is described according to each embodiment, but be not that each embodiment only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should make specification as a whole, technical scheme in each embodiment also can, through appropriately combined, form other execution modes that it will be appreciated by those skilled in the art that.
The foregoing is only the schematic embodiment of the utility model, not in order to limit scope of the present utility model.Any those skilled in the art, is not departing from equivalent variations, modification and the combination under the prerequisite of design of the present utility model and principle, done, all should belong to the scope of the utility model protection.
Claims (10)
1. for a drive circuit for relay, wherein said relay (REL_BO) comprises coil (COIL), conducting or cut off to changeable this relay operating state of the power supply of this coil, it is characterized in that, described drive circuit comprises:
At least one controlled switch element (Q102, Q101), itself and described coil (COIL) are connected between power supply (Vcc) and ground (GND), the power supply to described coil (COIL) with conducting or cut-out;
At least one protective circuit (210, D310, D410-N, D410-P, D510-N, D510-P), a protective circuit is for a controlled switch element, the first end of each protective circuit is connected to its corresponding controlled switch element (Q102, Q101) controlled end (b), its second end is connected to the control input end (REL_P for controlling this controlled switch element, REL_N), in the time being applied to voltage in described protective circuit lower than a predetermined threshold, described protective circuit disconnects the electrical connection between its first and second end, otherwise the electrical connection between its first and second end of conducting,
Wherein, described predetermined threshold is arranged in described each control input end (REL_P, REL_N) in the time of significant level, described controlled switch element (Q101, Q102) is all in conducting state, arbitrary during in fault level in each control input end (REL_P, REL_N), in described at least one controlled switch element (Q101, Q102) one of at least in dissengaged positions.
2. drive circuit according to claim 1, it is characterized in that, described controlled switch element (Q101, Q102) there is cut-in voltage, described predetermined threshold is a value between the first limiting value and the second limiting value, described the first limiting value makes at described control input end (REL_P, REL_N) voltage of controlled end that is carried in described controlled switch element when the fault level is just lower than its cut-in voltage, described the second limiting value is enough to make the voltage of the controlled end that is carried in described controlled switch element while being significant level in described control input end just greater than its cut-in voltage.
3. drive circuit according to claim 2, is characterized in that, described controlled switch element is NPN type triode (D310, D410-P), and described the first limiting value is maximum fault level value (V
f) deduct cut-in voltage (V between the base stage-emitter-base bandgap grading of this NPN type triode
be); Described the second limiting value is significant level (V
h) deduct cut-in voltage (V between the base stage-emitter-base bandgap grading of this NPN type triode
be).
4. drive circuit according to claim 2, is characterized in that, described controlled switch element is positive-negative-positive triode (D410-N), and described the first limiting value is that supply voltage (Vcc) deducts maximum fault level value (V
f) deduct again cut-in voltage (V between the emitter-base bandgap grading-base stage of this positive-negative-positive triode
eb); Described the second limiting value is that supply voltage (Vcc) deducts significant level (V
l) deduct again cut-in voltage (V between the emitter-base bandgap grading-base stage of this positive-negative-positive triode
eb).
5. drive circuit according to claim 1, is characterized in that, described protective circuit (210) comprises threshold decision part (211) and controlled switch part (215),
Described controlled switch part (215) connects into for conducting or disconnects the electrical connection between first, second end of described protective circuit, and its controlled end is controlled by described threshold decision part (211);
Described threshold decision part (211) has exceeded described predetermined threshold if judge the voltage being applied in described protective circuit, controlled switch part described in conducting, otherwise make described controlled switch part (215) in off-state.
6. according to arbitrary described drive circuit in claim 1-5; it is characterized in that; described protective circuit comprises at least one Zener diode (D310, D410-N, D410-P, D510-N), the reverse breakdown voltage that described predetermined threshold is described Zener diode.
7. according to arbitrary described drive circuit in claim 1-5; it is characterized in that; described protective circuit (D510-P) comprises at least one non-Zener diode (D513, D514), and described predetermined threshold is the forward conduction voltage sum of each non-Zener diode in described protective circuit.
8. according to arbitrary described drive circuit in claim 1-5, it is characterized in that, comprising:
Two described controlled switch elements (Q102, Q101), itself and described coil (COIL) are connected between power supply (Vcc) and ground (GND), the power supply to described coil (COIL) with conducting or cut-out;
Two described protective circuits (D410-N, D410-P, D510-N, D510-P), are connected respectively to described two and award control switch element.
9. drive circuit according to claim 8, is characterized in that,
Arbitrary Zener diode that comprises in described two protective circuits, and the described predetermined threshold reverse breakdown voltage that is described Zener diode.
10. the drive circuit described according to Claim 8; it is characterized in that; in described two protective circuits (D510-P), any one comprises the two or more non-Zener diode (D513, D514) of series connection, and described predetermined threshold is the forward conduction voltage sum of each non-Zener diode in described protective circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320478947.4U CN203674080U (en) | 2013-08-07 | 2013-08-07 | Relay drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320478947.4U CN203674080U (en) | 2013-08-07 | 2013-08-07 | Relay drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203674080U true CN203674080U (en) | 2014-06-25 |
Family
ID=50970347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320478947.4U Expired - Lifetime CN203674080U (en) | 2013-08-07 | 2013-08-07 | Relay drive circuit |
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| CN (1) | CN203674080U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992097A (en) * | 2017-05-24 | 2017-07-28 | 中国电子科技集团公司第四十研究所 | A kind of general magnetic padlock deposits radio-frequency relay drive circuit and its design method |
| CN111029214A (en) * | 2019-12-26 | 2020-04-17 | 中国电子科技集团公司第五十八研究所 | Low-side driving circuit of high-voltage relay |
-
2013
- 2013-08-07 CN CN201320478947.4U patent/CN203674080U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992097A (en) * | 2017-05-24 | 2017-07-28 | 中国电子科技集团公司第四十研究所 | A kind of general magnetic padlock deposits radio-frequency relay drive circuit and its design method |
| CN106992097B (en) * | 2017-05-24 | 2018-10-09 | 中国电子科技集团公司第四十一研究所 | A kind of general magnetic padlock deposits radio-frequency relay driving circuit and its design method |
| CN111029214A (en) * | 2019-12-26 | 2020-04-17 | 中国电子科技集团公司第五十八研究所 | Low-side driving circuit of high-voltage relay |
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