CN201054012Y - Voltage monitor - Google Patents
Voltage monitor Download PDFInfo
- Publication number
- CN201054012Y CN201054012Y CNU2007201547891U CN200720154789U CN201054012Y CN 201054012 Y CN201054012 Y CN 201054012Y CN U2007201547891 U CNU2007201547891 U CN U2007201547891U CN 200720154789 U CN200720154789 U CN 200720154789U CN 201054012 Y CN201054012 Y CN 201054012Y
- Authority
- CN
- China
- Prior art keywords
- voltage
- signal
- input
- delayed action
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model provides a voltage monitoring device which consists of a signal comparator, which is used for receiving, comparing two input voltages and outputting high-level or low-level signals, and a state displaying unit, which is connected with the signal comparator and used for conducting different displays based on the high or low levels output by the signal comparator. The utility model can realize a monitoring to the voltage. Furthermore, the utility model can conduct a hysteresis to the input voltage and facilitate the display unit to return to the state before the input voltage is changed in a delayed way when the input voltage received by the signal comparator is the variable signal; in addition, the utility model can exert a voltage bias to the input voltage to realize the monitoring to various voltages. The utility model can also conduct the continuous monitoring to a switch-in circuit and set the initial state for warning alarm.
Description
Technical field
The utility model relates to a kind of voltage monitor.
Background technology
In reactor protective system, control system is in the monitoring system, often need monitor voltage, with when monitored voltage reaches certain value, sends guard signal or alerting signal.For example, in reactor protection channel, usually need voltage monitor, so that monitored voltage parameter is monitored, when monitoring above certain certain value to send guard signal.And for example in control system, monitoring system, often need voltage monitor,, when monitoring, provide control signal, alarm signal, equipment provided protection and in time to notify the staff above certain certain value so that monitored voltage parameter is monitored.
The utility model content
In view of this, fundamental purpose of the present utility model is to provide a kind of voltage monitor, with realization voltage is monitored.
When the utility model further can be variable signal at the input voltage that signal comparator received, delayed action was carried out in variation to input voltage, made the display unit time-delay return input voltage and changed preceding state.
The utility model further can also apply bias voltage to input voltage, with realization different voltage is monitored.
The original state that the utility model further can also carry out continuous monitoring and alarm is set the circuit that inserts.
The voltage monitor that the utility model provides comprises: signal comparator is used to receive the two-way voltage of input and compare output high level or low level signal; Status display unit connects signal comparator, is used for carrying out different demonstrations according to the high level or the low level of signal comparator output.
Wherein, described status display unit comprises: control module is used for the high level or the low level of the output of received signal comparer, and exports varying voltage signal; Display unit is used to receive the voltage signal that control module sends, and carries out different demonstrations.
Wherein, described control module is a relay-operated controller, is used for the high level or the low level of received signal comparer output, and output HIGH voltage or low-voltage; Described display unit is the relay that comprises stand by lamp, is used for making relay be in conducting state or release conditions according to the high voltage or the low-voltage of the relay-operated controller output that receives, and is bright or go out with the control stand by lamp.
Wherein, further comprise: the delayed action unit, the input end of connection status display unit and signal comparator is when the input voltage that is used for receiving when signal comparator is variable signal, delayed action is carried out in variation to input voltage, makes the display unit time-delay return input voltage and changes preceding state.
Wherein, described delayed action unit comprises: delayed action direction unit is used to be controlled at wherein one road input voltage startup delayed action performance element when increasing or reducing that signal comparator receives; The delayed action performance element connects delayed action direction unit, after the enabling signal that receives delayed action direction unit, change in voltage is carried out delayed action, makes the state before display unit time-delay return voltage changes.
Wherein, further comprise: bias voltage units, be connected one road or two-way input end of signal comparator, be used for voltage input bias voltage to the input signal comparer.
Wherein further comprise: the safety feature unit, be connected one road or two-way input end of signal comparator, be used to monitor the continuity of the input circuit that connects signal comparator.
Wherein, further comprise: state shows initialization unit, is connected a road or two-way input end of signal comparator, is used for the show state of init state display unit.
As seen from the above, the voltage monitor that the utility model provides can be realized the same adjustable fixed value voltage of a variable voltage is compared monitoring.And, adding bias voltage, can realize two are with biasing or do not compare monitoring between the voltage with biasing.The utility model can also have safety feature, the circuit continuity of input signal is checked, and can be set when input signal disconnects and make the threshold value relay be in the state (adhesive or release) of requirement.The utility model also further can be provided with the delayed action circuit, thereby change in voltage is carried out delayed action, makes the state before display unit time-delay return voltage changes.
Description of drawings
Fig. 1 is the voltage monitor schematic diagram;
Fig. 2 is the signal comparator circuit diagram;
Fig. 3 is the status display unit circuit diagram;
Fig. 4 is the bias voltage units circuit diagram;
Fig. 5 is that safety feature unit and state show the initialization unit circuit diagram;
Fig. 6 is delayed action element circuit figure;
Fig. 7 is that the first embodiment input voltage changes synoptic diagram;
Fig. 8 is that the second embodiment input voltage changes synoptic diagram;
Fig. 9 is that the 3rd embodiment input voltage changes synoptic diagram;
Figure 10 is that the 4th embodiment input voltage changes synoptic diagram;
Figure 11 is that the 5th embodiment input voltage changes synoptic diagram;
Figure 12 is that the 6th embodiment input voltage changes synoptic diagram;
Figure 13 is that the 7th embodiment input voltage changes synoptic diagram;
Figure 14 is that the 8th embodiment input voltage changes synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated.
Show the utility model voltage monitor schematic diagram as Fig. 1, comprising: signal comparator, status display unit, delayed action unit can comprise that also bias voltage units, safety feature unit and state show initialization unit.Wherein, the output of signal comparator links to each other with status display unit, and the delayed action unit is connected the input end of status display unit and signal comparator, and bias voltage units and safety feature unit are connected to a road or two-way input end of signal comparator.
Signal comparator receives the two-way voltage of input and compares, and output high level or low level signal be the result as a comparison; Status display unit is carried out different demonstrations according to the high level or the low level of signal comparator output.When input voltage that signal comparator received is variable signal, the delayed action unit to voltage input carry out delayed action, make the display unit time-delay return state before input voltage changes.In addition, can be by the input voltage input bias voltage of bias voltage units to signal comparator.The continuity of the circuit of the input by safety feature unit monitor signal comparer also can be in advance shows that by state initialization unit import interim voltage, with the show state of init state display unit.
Fig. 2 shows the signal comparator circuit diagram, as seen from the figure, by the amplifier A1 in the signal comparator as differential comparator, two-way voltage to input compares, and output signal S equals amplifier gain G and multiply by the poor of input signal E1 and E2, i.e. S=G (E2-E1), when being set at the E2 input voltage and being equal to or higher than E 1 input voltage, output signal is being for just and trend 18V, and when the E2 input voltage was lower than the E1 input voltage, output signal was for negative and tend to 0.Wherein, capacitor C3 is used for the frequency band of limiting amplifier reduces the influence disturb on output signal.Network R26-3 and R26-4 are used for the filtering input signal.
As shown in Figure 1, status display unit comprises: control module is used for the high level or the low level of the output of received signal comparer, and exports varying voltage signal; Display unit connects control module, is used to receive the different voltages of control module and carries out difference in view of the above show.Control module is realized by relay-operated controller, realizes that by a voltage stabilizing diode D7 described display unit is realized by the relay that comprises stand by lamp among the embodiment as shown in Figure 3.
Adopt the reason of voltage stabilizing diode to be: when input signal E2 is lower than input signal E 1, comparer output trend 0, but be not equal to 0.Therefore, adopt voltage stabilizing diode D7 as a comparison the switch of device output signal move.As long as comparator output signal becomes when being lower than voltage stabilizing diode voltage, diode is cut off like this, and the base stage of transistor Q2 is 0 by resistor R 20 bias voltage of executing, and transistor Q2 is cut off, and relay is in release conditions and the stand by lamp disconnection is extinguished.When input signal E2 becomes when equaling or exceeding signal E1, comparer output trend+18V, the base stage of voltage stabilizing diode conducting and transistor Q2 applies bias voltage by voltage drop on resistor R 20 two ends, transistor Q2 conducting, and relay is in on-state and stand by lamp illuminating state.
Wherein, capacitor C4 and resistor R 21 are used for realizing the time-delay of relay.Voltage stabilizing diode D4 is used for protective transistor in case the superpotential of being exported by relay coil when relay status changes.Branch breaking the bridge R27-R28 is used for transmitting the logic output of a relay status, and output 1 expression is in release conditions, and output 0 expression is in on-state (the about 7V of 1=).
Bias voltage units shown in 4, the position that is arranged on bonding jumper E1 and D1 is relevant with pot P1 bias voltage size with set point.Wherein, bias voltage may be zero, forward or reverse, when putting bonding jumper E1 and D1, be zero-bias for example in 0-1 position, position, putting bonding jumper E1 and D1 respectively is forward input E2 bias voltage when position 0-3,0-2 position, and putting bonding jumper E1 and D1 respectively is the bias voltage of reverse input signal E1 when position 0-2,0-3 position.
Show safety feature unit and state demonstration initialization unit as Fig. 5, be arranged on the location bonding jumper B1 on the characterization plug-in unit, allow to check input signal E1 or E2 wherein 1 continuity and under the situation of this fade out, set relay and be in predetermined alarm condition, or release or on-state.
Adoptable 4 kinds of situations are set the predetermined state of relay:
--check that signal E1 and relay are in release conditions and report to the police.Bonding jumper B1 is arranged at 3-1.
When signal E1 diminuendo, by resistor R 30, comparer reverse input end reception+10.24V.When reverse input is imported when big than forward, output trend 0, relay is transformed into release conditions.
--check that signal E1 and relay are in on-state and report to the police.Bonding jumper B1 is arranged at 3-2.
When signal E1 disappeared, by resistor R 30, comparer oppositely input was back to 0V.Import greater than reverse input when forward, just be output as, relay is transformed into on-state.
--check that signal E2 and relay are in release conditions and report to the police.Bonding jumper B1 is arranged at 4-2.
When signal E2 diminuendo, by resistor R 35, the input of comparer forward is back to 0V.When reverse input is imported greater than forward, export trend 0, relay is transformed into release conditions.
--check that signal E2 and relay are in on-state and report to the police.Bonding jumper B1 places 4-1.
When signal E2 diminuendo, by resistor R 35 comparer positive input reception+10.24V.When the input of forward input ratio inverse is big, just be output as, relay is transformed into on-state.
As shown in Figure 1, the delayed action unit comprises: delayed action direction unit is used to be controlled at wherein one road input voltage startup delayed action performance element when increasing or reducing that signal comparator receives; The delayed action performance element connects delayed action direction unit, after the enabling signal that receives delayed action direction unit, change in voltage is carried out delayed action, makes the state before display unit time-delay return voltage changes.Participating in the delayed action element circuit shown in Fig. 6 below is elaborated.
As seen from Figure 6, the retarded potential H of pot P3 output is by the resistor R 12+R13 on one side and the R11+R14 of another side, is applied to 2 input ends of comparer A1 respectively. and with input signal E1 and E2 addition.Wherein, retarded potential meter minimum value by pot P3 output is set by resistor R 2, delayed action can increase or any operation when signal reduces at signal, and the direction unit of its delayed action is determined by being welded on bonding jumper A1 on the characterization plug-in unit and the position of C1.Can be divided into the situation of not having hysteresis, hysteresis being arranged, describe below:
A) there is not the operation that lags behind
Be provided with bonding jumper A1 in 3-2 and C1 in 2-1 or A1 in 3-1, C1 does not connect, when 2 input signal E1, E2 keep mutually very near the time, adjust delayed action to the minimum value that is fit to relay time interval limit.During no delayed action, disequilibrate when between two input signal E1, E2, when infinitesimal deviation was arranged, the high sensitivity of comparer A1 caused that relay status changes.
B) operation of hysteresis is arranged
As following table 1, show several situations of the operation that lags behind.Wherein, the reference value of input signal item and variable refer to the voltage that is used for as the monitoring benchmark in the table 1, and variable refers to the voltage of being monitored.The delayed action direction is the hysteresis that is acted on when variable voltage is increased or reduces.The state of relay is the variable signal of the input state during relay when reaching threshold value.
Table 1
Below, 8 kinds of above-mentioned situations are further described:
1, high threshold, when signal increases, delayed action is arranged, signal E2 is considered to variable with respect to signal E1.At this moment, bonding jumper A1 places position 3-1.Bonding jumper C1 does not connect.Shown in Figure 7 the describing of reference:
As long as signal E2 is lower than signal E1, amplifier A1 is output as 0, and transistor Q2 is cut off, and relay is in release conditions.Transistor Q3 conducting shows 0 on the H2 point of amplifier forward input, therefore offset the delayed action in the forward input.So be at amp.in:
Forward input=E2; Reverse input=E1+H (H=delayed action current potential).
For making relay be transformed into on-state, signal E2 must become and equals E1+H.When signal E2 becomes when equaling E1+H, amplifier is output as positive, and transistor Q2 conducting and relay are transformed into on-state.Transistor Q3 is cut off and the delayed action current potential is resumed at the H point.Be after relay is connected, on positive input, have a current potential (being E2=E1+H) that surpasses reverse input end current potential H value.
And if after this for making relay turn back to release conditions, signal E2 must reduce the potentiometric H value of delayed action, thereby has:
E2+H=E1+H, i.e. E2=E1, promptly relay turns back to release conditions when E2=E1.
2, high threshold, when signal reduces, delayed action is arranged, signal E2 is considered to variable with respect to signal E1.At this moment, bonding jumper A1 places position 3-2.Bonding jumper C1 places position 2-1.Shown in Figure 8 the describing of reference:
As long as signal E2 is lower than signal E1, relay is in release conditions.Transistor Q3 conducting, transistor Q4 and Q5 are cut off.So on amp.in be:
Forward input: E2+H; Oppositely import: E1+H.
For making relay be transformed into on-state, it is E2=E1 that signal E2+H must equal E1+H.
When signal E2 becomes when equaling E1, transistor Q3 ends, transistor Q4 and Q5 conducting, and oppositely show 0 on the H1 point of input at amplifier.Therefore the delayed action current potential in this input is cancelled.Promptly after relay is connected, in the forward input, there is 1 current potential that surpasses reverse input voltage H value.For making relay turn back to release conditions, the signal E2 that is applied on the positive input must reduce the H value, thereby has:
E2=E1-H, promptly relay returns release conditions when E2=E1-H.
3, high threshold, when signal reduces, delayed action is arranged, signal E1 is considered to variable with respect to signal E2.At this moment, bonding jumper A1 places position 3-1.Bonding jumper C1 does not connect.Shown in Figure 9 the describing of reference:
As long as signal E1 is lower than signal E2, amplifier just is output as, and transistor Q2 conducting and relay are in on-state.Transistor Q3 is cut off.So on amp.in, have:
Forward input: E2+H; Oppositely import: E1+H.
For making relay be transformed into release conditions, signal E1+H must become and equals H2+H, i.e. E1=E2.
When signal E1 becomes when equaling E2, amplifier output becomes negative, and Q2 ends, and relay turns back to release conditions.Transistor Q3 conducting shows 0 on the H2 point of amplifier forward input, and offsets the delayed action current potential in this input.Promptly after relay discharges, oppositely can there be a current potential that surpasses forward input current potential H value in the input.
For making relay be transformed into on-state again, signal E1 must reduce the H value, thereby has: E1=E2-H, promptly relay returns on-state when E1=E2-H.
4, high threshold, when signal increases, delayed action is arranged, signal E1 is considered to variable with respect to signal E2.At this moment, bonding jumper A1 places position 3-2.Bonding jumper C1 places position 2-1.Shown in Figure 10 the describing of reference:
As long as signal E1 is lower than signal E2, relay is in on-state.Transistor Q3 is cut off, transistor Q4 and 05 conducting and oppositely show 0 on the H1 point of input at amplifier.Therefore the delayed action current potential in this input is cancelled.On amp.in, exist:
Forward input: E2+H; Oppositely import: E1.
For making relay be transformed into release conditions, signal E1 must become and equals E2+H.When signal E1 equaled E2+H, transistor Q3 conducting and transistor Q4 and Q5 ended.Relay is transformed into release conditions, and this moment, retarded potential was resumed at the H1 point, on reverse input end, has 1 current potential that surpasses forward input current potential H value.
For making relay turn back to on-state, signal E1 must be reduced the H value, thereby we have: E1+H=E2+H, promptly relay returns on-state during E1=E2.
5, low threshold value, when signal reduces, delayed action is arranged, signal E1 is considered to variable with respect to signal E2.At this moment, bonding jumper A1 places position 3-1.Bonding jumper C1 does not connect.Shown in Figure 11 the describing of reference:
As long as signal E1 surpasses signal E2, transistor Q2 is cut off, and relay is in release conditions.Transistor 03 conducting shows 0 on the H2 of positive input point.On amp.in, exist:
Forward input=E2 oppositely imports=E1+H.
For making relay be transformed into on-state, signal E1+H must become and equals E2 thereby E1=E2-H.
When signal E1 becomes when equaling E2-H, transistor Q2 conducting and relay are transformed into on-state, and this moment, transistor Q3 ended, and the delayed action current potential is resumed at H2 point, exists 1 to surpass the current potential of oppositely importing current potential H value on positive input.
For making relay turn back to release conditions, signal E1 must be increased the retarded potential of H value, so:
E1+H=E2+H, promptly relay returns release conditions during E1=E2.
6, low threshold value, when signal increases, delayed action is arranged, signal E1 relative signal E2 is considered to variable.At this moment, bonding jumper A1 places position 3-2.Bonding jumper C1 places position 2-1.Shown in Figure 12 the describing of reference:
As long as signal E1 surpasses signal E2, relay just is in release conditions.Transistor Q3 conducting and transistor Q4 and Q5 are cut off.Exist this moment on amp.in:
The forward input: E2+H oppositely imports: E1+H.
For making relay be transformed into on-state, signal E1+H must equal signal E2+H, i.e. E1=E2.
When signal E1 becomes when equaling E2, relay is transformed into on-state, and this moment, transistor Q3 ended.Transistor Q4 and Q5 conducting and on the H1 point of oppositely input, show 0.Therefore the delayed action current potential in this input is cancelled, and is oppositely producing 1 current potential that is lower than forward input current potential H value in the input.
For making relay turn back to release conditions, signal E1 must be increased the H value, i.e. E1=E2+H, and relay returns release conditions in the time of at the moment.
7, low threshold value, when signal increases, delayed action is arranged, signal E2 is considered to variable with respect to signal E1.At this moment, bonding jumper A1 places position 3-1.Bonding jumper C1 does not connect.Shown in Figure 13 the describing of reference:
As long as signal E2 surpasses signal E1, transistor Q2 conducting and relay are in on-state.Transistor Q3 is cut off, and exists on amp.in:
Forward input=E2+H oppositely imports=E1+H.
For making relay be transformed into release conditions, signal E2+H must become and equals E1+H, i.e. E2=E1.
When signal E2 equaled E1, transistor Q2 ended, and relay turns back to release conditions.Transistor Q3 conducting shows 0 on the H2 point of forward input, produce 1 current potential that is lower than reverse input current potential H value in the forward input.
For making relay turn back to on-state, signal E2 must increase the H value, thereby we have: E2=E1+H, relay returns on-state in the time of at the moment.
8, low threshold value, when signal reduces, delayed action is arranged, signal E2 is considered to variable with respect to signal E1.At this moment, bonding jumper A1 places position 3-2.Bonding jumper C1 places position 2-1.Shown in Figure 14 the describing of reference:
As long as signal E2 surpasses signal E1, relay is in on-state.Transistor Q3 is cut off.Transistor Q4 and Q5 conducting and on the H1 point of oppositely input, show 0.So the delayed action current potential on this input end is cancelled.On amp.in, exist:
Forward input=E2+H oppositely imports=E1.
For making relay be transformed into release conditions, signal E2 must become and equals E1-H.
When signal E2 equaled signal E1-H, transistor Q2 ended, and relay turns back to release conditions.Transistor Q3 conducting.Transistor Q4 and Q5 end.The delayed action current potential is resumed at the H1 point, is oppositely producing 1 current potential that surpasses forward input current potential H value in the input.
For making relay turn back to on-state, signal E2 must increase the H value.Thereby we have: E2+H=E1+H, i.e. and E2=E1, relay returns on-state in the time of at the moment.
More than describe the utility model voltage monitor in detail, as seen from the above, the utility model can be monitored the voltage of input, and can add bias voltage, thereby can all monitor the different voltages of input, can realize and to compare monitoring between the same adjustable fixed value voltage of variable voltage.And delayed action circuit of the present utility model can be realized the hysteresis of different directions.And the safety feature that the utility model provides can carry out the circuit continuity inspection to input signal, and input signal can make the threshold value relay be in the original state of requirement when disconnecting.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (8)
1. a voltage monitor is characterized in that, comprising:
Signal comparator is used to receive the two-way voltage of input and compare, output high level or low level signal;
Status display unit connects signal comparator, is used for carrying out different demonstrations according to the high level or the low level of signal comparator output.
2. voltage monitor according to claim 1 is characterized in that, described status display unit comprises:
Control module is used for the high level or the low level of the output of received signal comparer, and exports varying voltage signal;
Display unit is used to receive the voltage signal that control module sends, and carries out different demonstrations.
3. voltage monitor according to claim 2 is characterized in that,
Described control module is a relay-operated controller, is used for the high level or the low level of received signal comparer output, and output HIGH voltage or low-voltage;
Described display unit is the relay that comprises stand by lamp, is used for making relay be in conducting state or release conditions according to the high voltage or the low-voltage of the relay-operated controller output that receives, and is bright or go out with the control stand by lamp.
4. voltage monitor according to claim 1 is characterized in that, further comprises:
The delayed action unit, the input end of connection status display unit and signal comparator, when the input voltage that is used for receiving when signal comparator was variable signal, delayed action was carried out in variation to input voltage, made the display unit time-delay return input voltage and changed preceding state.
5. voltage monitor according to claim 4 is characterized in that, described delayed action unit comprises:
Delayed action direction unit is used to be controlled at wherein one road input voltage startup delayed action performance element when increasing or reducing that signal comparator receives;
The delayed action performance element connects delayed action direction unit, after the enabling signal that receives delayed action direction unit, change in voltage is carried out delayed action, makes the state before display unit time-delay return voltage changes.
6. voltage monitor according to claim 1 is characterized in that, further comprises:
Bias voltage units is connected one road or two-way input end of signal comparator, is used for the voltage input bias voltage to the input signal comparer.
7. voltage monitor according to claim 1 is characterized in that, further comprises:
The safety feature unit is connected one road or two-way input end of signal comparator, is used to monitor the continuity of the input circuit that connects signal comparator.
8. voltage monitor according to claim 1 is characterized in that, further comprises:
State shows initialization unit, is connected a road or two-way input end of signal comparator, is used for the show state of init state display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201547891U CN201054012Y (en) | 2007-05-17 | 2007-05-17 | Voltage monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201547891U CN201054012Y (en) | 2007-05-17 | 2007-05-17 | Voltage monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201054012Y true CN201054012Y (en) | 2008-04-30 |
Family
ID=39393674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201547891U Expired - Fee Related CN201054012Y (en) | 2007-05-17 | 2007-05-17 | Voltage monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201054012Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871963A (en) * | 2010-05-28 | 2010-10-27 | 上海宏力半导体制造有限公司 | Power voltage detection circuit |
| TWI471050B (en) * | 2011-07-12 | 2015-01-21 | Accton Technology Corp | Operating apparatus for a wireless access point |
| CN104885364A (en) * | 2012-12-27 | 2015-09-02 | 矢崎总业株式会社 | Electromagnetic inductive load control device |
| CN113985107A (en) * | 2021-11-23 | 2022-01-28 | 珠海格力电器股份有限公司 | Voltage detection method and device and readable storage medium |
-
2007
- 2007-05-17 CN CNU2007201547891U patent/CN201054012Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871963A (en) * | 2010-05-28 | 2010-10-27 | 上海宏力半导体制造有限公司 | Power voltage detection circuit |
| TWI471050B (en) * | 2011-07-12 | 2015-01-21 | Accton Technology Corp | Operating apparatus for a wireless access point |
| CN104885364A (en) * | 2012-12-27 | 2015-09-02 | 矢崎总业株式会社 | Electromagnetic inductive load control device |
| CN113985107A (en) * | 2021-11-23 | 2022-01-28 | 珠海格力电器股份有限公司 | Voltage detection method and device and readable storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201054012Y (en) | Voltage monitor | |
| CN100563080C (en) | The method of main power supply switching controls and device | |
| CN106340953A (en) | Dual-supply automatic transfer switch | |
| CN205230284U (en) | Explosion -proof combustible gas detector of intelligent pronunciation | |
| CN107170188B (en) | Adjustable audible and visual alarm device for DCS system and use method thereof | |
| CN202208514U (en) | Intelligent monitor device of a belt type conveyer | |
| CN204536411U (en) | A kind of pot Acquisition Circuit with burn out detection | |
| CN202495127U (en) | Fire disaster alarming device for cable bridge | |
| CN106093774B (en) | A kind of switch detection circuit | |
| CN103116378B (en) | Analog circuit with variable resistance | |
| CN203054623U (en) | Condensation automatic controller | |
| CN209217692U (en) | Chip protection circuit, power circuit and display device | |
| CN213181831U (en) | Detection circuit, detection device and detection system | |
| CN208820459U (en) | A kind of shorted to earth protective device and inverter system | |
| CN103116122A (en) | Power unit detection circuit, series circuit and bypass detection system | |
| CN108054723B (en) | Protective device, low-voltage circuit system and the lamp system of multichannel low-voltage circuit | |
| CN203340082U (en) | Light switching device having radio-frequency detecting function | |
| CN206132833U (en) | Full optical fiber current sensor | |
| CN201829921U (en) | Non-peak ultra-low residual pressure signal surge protector | |
| CN109149525A (en) | A kind of shorted to earth protective device and inverter system | |
| CN201383680Y (en) | Intelligent power cabinet control system and intelligent power cabinet employing same | |
| CN110365322A (en) | A kind of digital output card | |
| CN203517325U (en) | Digital-display-type gas automatic switching device | |
| CN203260867U (en) | USB connection line with status display function | |
| CN204886164U (en) | Surge circuit is prevented in lightning protection of LED lamps and lanterns |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080430 Termination date: 20150517 |
|
| EXPY | Termination of patent right or utility model |