CN202888791U - Load controller based on zero-cross starting overvoltage protection - Google Patents
Load controller based on zero-cross starting overvoltage protection Download PDFInfo
- Publication number
- CN202888791U CN202888791U CN 201220536509 CN201220536509U CN202888791U CN 202888791 U CN202888791 U CN 202888791U CN 201220536509 CN201220536509 CN 201220536509 CN 201220536509 U CN201220536509 U CN 201220536509U CN 202888791 U CN202888791 U CN 202888791U
- Authority
- CN
- China
- Prior art keywords
- resistance
- links
- circuit
- zero
- comparator
- 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 - Lifetime
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a load controller based on zero-cross starting overvoltage protection. The load controller based on zero-cross starting overvoltage protection comprises: a sampling circuit; a zero-cross detection circuit and an overvoltage detection circuit that are connected with the sampling circuit; a comprehensive protection circuit that is connected with the zero-cross detection circuit and the overvoltage detection circuit; and a relay control circuit connected with the comprehensive protection circuit. The zero-cross detection circuit is adopted to realize zero-cross starting, thereby ensuring that motion is conducted by a relay when an AC voltage is passing by a zero point, avoiding high currents during starting, and greatly protecting the relay and a post-stage circuit. Meanwhile, the relay small in capacity, low in current and low in cost is possible to be applied to a circuit. Moreover, the overvoltage detection circuit is adopted to realize an overvoltage protection function, the circuit can be cut off in time for protection if a voltage is overly high, and the circuit can be automatically recovered to stay under a normal working state once an overvoltage dangerous case is solved.
Description
Technical field
The utility model belongs to the control technology field, is specifically related to a kind of load controller based on crossing the zero start overvoltage protection.
Background technology
In the existing market, the controller that utilizes telecommunication technique to make, the mode that control load starts all is to have adopted relay normally-closed contact powering load, but in the mode of relay normally-closed contact, by the power line carrier, PLC controller rear (i.e. outage) closed in load, restart in the loading process for the second time, relay reverts to normally off from off-state, very large of the electric current that relay contact need to bear, especially when the pure inductive load of control, closing contact when being in peak values of ac, the alternating current that need to bear are tens times of electric current of contact itself, even larger.What therefore adopt on the market all is the relay of large current contact, for example the contact capacity of 16A/250V.But such relay often cost is high, and volume is larger.
And there is long problem in relay useful life in present controller majority, mainly is that starting current is very large because relay is in frequently under the on off state, causes the abnormal consumption of the deposited or contact of relay tip etc., causes the relay scaling loss.
In telecommunication control unit, the circuit that overvoltage protection cuts off load supplying often is not installed all.At the scene in the installation process; because the workmen is carefully or in the situation of wiring error; the capital is linked into controller between phase line and the phase line; so that controller has born the 380V alternating current; and most load all is to use the 220V Alternating Current Power Supply; and there is not the circuit of electric voltage over press protection load inside yet, therefore causes load voltage excessive and cause and burn.
For the existing controller with overvoltage crowbar, when electric voltage over press occured, most cases had been carried out and has been cut off the purpose that circuit reaches isolation, and still, after the overvoltage dangerous situation was cancelled, circuit can't reclose automatically, recovered normal operating conditions.
Summary of the invention
For the existing above-mentioned technological deficiency of prior art, the invention provides a kind of load controller based on crossing the zero start overvoltage protection, overcome large current start load and workmen's misconnection circuit causes the problems such as overtension.
A kind of load controller based on crossing the zero start overvoltage protection comprises: sample circuit, the zero cross detection circuit that is connected with sample circuit are connected the general protective circuit that is connected with over-voltage detection circuit with zero cross detection circuit and the bang-bang circuit that is connected with general protective circuit with over-voltage detection circuit.
Described sample circuit is used for industrial-frequency alternating current is carried out zero sample, obtains zero signal; Simultaneously industrial-frequency alternating current is carried out voltage sample, obtain voltage signal;
Described zero cross detection circuit is used for making described zero signal and given reference voltage signal Vref1 to compare, and obtains the zero passage enabling signal;
The remote control signal that described over-voltage detection circuit is used for providing according to remote controllers compares described voltage signal and reference voltage signal Vref1, obtains the overvoltage protection signal;
Described general protective circuit is used for judging according to described zero passage enabling signal and overvoltage protection signal, according to the judged result output drive signal;
Described bang-bang circuit is used for according to described driving signal controlling load power on/off.
Preferably, described over-voltage detection circuit is connected with buffer circuit, and it is used for described remote control signal is carried out level conversion; Can make load control circuit and all kinds of remote controllers general.
Described buffer circuit adopts optical coupler.
Preferably, described zero cross detection circuit is comprised of two comparators, three resistance, two diodes and an electric capacity; Wherein, the negative electrode of diode D4 connects supply voltage, the anode of diode D4 links to each other with the normal phase input end of comparator U1A and receives zero signal, the inverting input of comparator U1A receives given reference voltage signal Vref1, the output of comparator U1A links to each other with an end of resistance R 48 and the anode of diode D10, another termination supply voltage of resistance R 48, one end of the negative electrode of diode D10 and resistance R 47, one end of resistance R 46 links to each other with an end of capacitor C 19, the other end of resistance R 47 links to each other with the other end of capacitor C 19 and ground connection, the other end of resistance R 46 links to each other with the inverting input of comparator U1B, the normal phase input end of comparator U1B receives given reference voltage signal Vref2, the output output zero passage enabling signal of comparator U1B; This circuit structure can detect and obtain comparatively accurate zero passage enabling signal.
Described over-voltage detection circuit is by two electric capacity, three resistance and a comparator; Wherein, the inverting input of comparator U2A links to each other with an end of capacitor C 34 and the receiver voltage signal; the other end of capacitor C 34 links to each other with an end of resistance R 37; another termination supply voltage of resistance R 37; the normal phase input end of comparator U2A links to each other and the receiving remote control signal with an end of resistance R 89, an end of resistance R 90 and an end of capacitor C 33; the other end of resistance R 89 receives given reference voltage signal Vref1; the other end ground connection of capacitor C 33, the other end of resistance R 90 link to each other with the output of comparator U2A and the output over-voltage protection signal.
Described general protective circuit is by two triodes, four diodes, six resistance, an electric capacity and a comparator; Wherein, one termination of capacitor C 21 is received the zero passage enabling signal; the other end of capacitor C 21 links to each other with an end of resistance R 50; one end of the other end of resistance R 50 and resistance R 51; one end of resistance R 52 links to each other with the negative electrode of diode D11; one end of the other end of resistance R 51 and resistance R 55; the emitter of the anode of diode D11 and triode Q5 links to each other and ground connection; the other end of resistance R 52 links to each other with the gate pole of triode Q5; the collector electrode of triode Q5 links to each other with an end of resistance R 53; the other end of resistance R 53 links to each other with the gate pole of triode Q6; the emitter of triode Q6 links to each other with the negative electrode of diode D13 and receives the overvoltage protection signal; the collector electrode of triode Q6 links to each other with the anode of diode D12; the anode of the negative electrode of diode D12 and diode D13; the other end of resistance R 55; one end of resistance R 59 links to each other with the normal phase input end of comparator U2B; the inverting input of comparator U2B receives given reference voltage signal Vref1; the output of comparator U2B links to each other with the anode of diode D14 and an end of resistance R 58; the negative electrode of diode D14 links to each other with the other end of resistance R 59, the other end output drive signal of resistance R 58.
The utility model is by adopting zero cross detection circuit to realize crossing zero start, guarantee relay execution action in voltage over zero, large electric current when having avoided starting, greatly protected relay and late-class circuit, made simultaneously low capacity, little electric current, the cheaply application of relay in circuit become possibility; On the other hand, the utility model also by adopting over-voltage detection circuit to realize over-voltage protecting function, when overtension, can in time cut off the effect that circuit plays protection, in case the overvoltage dangerous situation is cancelled, the energy automatic restoring circuit enters normal operating conditions.
So the utility model has overcome large current start load and workmen's misconnection circuit causes the problems such as overtension, plays alternating current zero crossing starting load and overvoltage protection disconnecting consumers, and provide the triple protection function of control signal by remote controllers.Starting load during alternating current zero crossing, the alternating current during ac zero-crossing point is very little, relay contact closure, the electric current that bear on the contact this moment is also very little, therefore the situation that large electric current burns relay contact can't occur.Detect simultaneously alternating voltage and whether surpass the magnitude of voltage of setting, surpass setting voltage value and then think overtension, relay is not closed, the load outage.Satisfy simultaneously alternating current zero crossing, alternating voltage satisfies under the load request future, by telecommunication control unit control relay break-make, powering load.This circuit structure is simple and practical, and is safe and reliable.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of sample circuit.
Fig. 3 is the structural representation of zero cross detection circuit.
Fig. 4 is the structural representation of over-voltage detection circuit.
Fig. 5 is the structural representation of general protective circuit.
Fig. 6 is the structural representation of bang-bang circuit.
Fig. 7 provides the structural representation of circuit for reference voltage.
Embodiment
In order more specifically to describe the utility model, below in conjunction with the drawings and the specific embodiments the technical solution of the utility model and relative theory thereof are elaborated.
As shown in Figure 1, a kind of load controller based on crossing the zero start overvoltage protection comprises: sample circuit, zero cross detection circuit, over-voltage detection circuit, general protective circuit, buffer circuit and bang-bang circuit.
The AC network of sample circuit and 220V is joined, and it is used for industrial-frequency alternating current is carried out zero sample, obtains zero signal ZCD; Simultaneously industrial-frequency alternating current is carried out voltage sample, obtain voltage signal OVP; In the present embodiment, sample circuit adopts circuits built as shown in Figure 2, L and N start to exchange fire respectively line and zero line.
Zero cross detection circuit links to each other with sample circuit, and it is used for making zero signal ZCD and given reference voltage signal Vref1 to compare, and obtains zero passage enabling signal PULSE; In the present embodiment, zero cross detection circuit is comprised of two comparators, three resistance, two diodes and an electric capacity, as shown in Figure 3; Wherein, the negative electrode of diode D4 meets supply voltage VS1, the anode of diode D4 links to each other with the normal phase input end of comparator U1A and receives zero signal, the inverting input of comparator U1A receives given reference voltage signal Vref1, the output of comparator U1A links to each other with an end of resistance R 48 and the anode of diode D10, another termination supply voltage of resistance R 48, one end of the negative electrode of diode D10 and resistance R 47, one end of resistance R 46 links to each other with an end of capacitor C 19, the other end of resistance R 47 links to each other with the other end of capacitor C 19 and ground connection, the other end of resistance R 46 links to each other with the inverting input of comparator U1B, the normal phase input end of comparator U1B receives given reference voltage signal Vref2, the output output zero passage enabling signal PULSE of comparator U1B; Reference voltage signal Vref1 and Vref2 are provided by circuit as described in Figure 7, and reference voltage signal Vref1 is 2.5V.
Over-voltage detection circuit links to each other with buffer circuit with sample circuit, and its remote control signal Relay that is used for providing according to remote controllers compares voltage signal OVP and reference voltage signal Vref1, obtains overvoltage protection signal OutA; In the present embodiment, over-voltage detection circuit is by two electric capacity, three resistance and a comparator, as shown in Figure 4; Wherein, the inverting input of comparator U2A links to each other with an end of capacitor C 34 and receiver voltage signal OVP, the other end of capacitor C 34 links to each other with an end of resistance R 37, another termination supply voltage VS1 of resistance R 37, one end of the normal phase input end of comparator U2A and resistance R 89, one end of resistance R 90, one end of capacitor C 33 and the output of buffer circuit link to each other and receive signal RelayDI, the other end of resistance R 89 receives given reference voltage signal Vref1, the other end ground connection of capacitor C 33, the other end of resistance R 90 link to each other with the output of comparator U2A and output over-voltage protection signal OutA; Signal RelayDI is provided by buffer circuit, and it adopts optical coupler, the remote control signal Relay that the input receiving remote controller of optical coupler provides, output output signal RelayDI.
General protective circuit links to each other with over-voltage detection circuit with zero cross detection circuit, and it is used for judging according to zero passage enabling signal PULSE and overvoltage protection signal OutA, according to judged result output drive signal OutB; In the present embodiment, general protective circuit is by two triodes, four diodes, six resistance, an electric capacity and a comparator, as shown in Figure 5; Wherein, one termination of capacitor C 21 is received zero passage enabling signal PULSE; the other end of capacitor C 21 links to each other with an end of resistance R 50; one end of the other end of resistance R 50 and resistance R 51; one end of resistance R 52 links to each other with the negative electrode of diode D11; one end of the other end of resistance R 51 and resistance R 55; the emitter of the anode of diode D11 and triode Q5 links to each other and ground connection; the other end of resistance R 52 links to each other with the gate pole of triode Q5; the collector electrode of triode Q5 links to each other with an end of resistance R 53; the other end of resistance R 53 links to each other with the gate pole of triode Q6; the emitter of triode Q6 links to each other with the negative electrode of diode D13 and receives overvoltage protection signal OutA; the collector electrode of triode Q6 links to each other with the anode of diode D12; the anode of the negative electrode of diode D12 and diode D13; the other end of resistance R 55; one end of resistance R 59 links to each other with the normal phase input end of comparator U2B; the inverting input of comparator U2B receives given reference voltage signal Vrefl; the output of comparator U2B links to each other with the anode of diode D14 and an end of resistance R 58; the negative electrode of diode D14 links to each other with the other end of resistance R 59, the other end output drive signal OutB of resistance R 58.
Bang-bang circuit links to each other with general protective circuit; it is used for according to driving signal OutB control load RL power on/off, and in the present embodiment, bang-bang circuit adopts circuits built as shown in Figure 6; a termination live wire of relay J normally opened contact wherein, another termination load RL.
The operation principle of present embodiment is as follows:
Judge for alternating current zero crossing:
Determine alternating current zero crossing starting relay J by ratio amplifier U1A in the zero cross detection circuit, Vref1 determines the alternating current zero crossing reference point, Vref2 determines relay J operating voltage reference point, namely when ZCD voltage is lower than Vref1 and VS1 voltage and satisfies the relay J operating voltage, then assert to exchange to be in zero crossing.
Implementation process is as follows: AC power is after bridge heap BD1 rectification, take out voltage ZCD after the electric resistance partial pressure and be input to ratio amplifier U1A anode A+, by ratio amplifier U1A ZCD voltage and Vref1 voltage are compared, when ZCD voltage is lower than Vref1 voltage, the output output voltage 0V of ratio amplifier U1A, capacitor C 19 is through resistance R 47 discharges, after the discharge when voltage is lower than Vref2, the output output high level (VS1) of ratio amplifier U1B, then regard as interchange and be in zero crossing this moment, ratio amplifier U1B drives Q5, Q6 makes it be in the saturation conduction state, judge again whether overvoltage of alternating voltage, if alternating voltage satisfies the load voltage requirement, closing relay J under this state then, if alternating voltage does not satisfy in the load request situation, closing relay J not then.
If ZCD is during greater than Vrefl, then the output of ratio amplifier U1A is output as high level, through diode D10 capacitor C 19 quick charges are input to ratio amplifier U1B negative terminal B-by R46, compare through amplifier comparator U1B and Vref2, when being higher than Vref2, the output of ratio amplifier U1B is output as low level, Q5 and Q6 are in cut-off state, this state thinks that then interchange was not in nought state, even ratio amplifier 2 judges that alternating voltages satisfy load request, relay J also can be closed.
Judge for exchanging overvoltage protection:
Exchange overvoltage protection and judge that the collection point is: AC power is piled the voltage OVP that BD1, C4, C5 rectifying and wave-filtering obtain by electric resistance partial pressure through bridge and is input to ratio amplifier U2A negative terminal A-.
When interchange is under the zero crossing state, OVP compares Vref1 through ratio amplifier U2A, when OVP is lower than Vref1, the output output high level (VS1) of ratio amplifier U2A inputs to ratio amplifier U2B anode B+ through triode Q6, diode D12, and compare through ratio amplifier U2B and Vref1 this moment, the output output high level of ratio amplifier U2B, this moment, circuit thought that working volts alternating current satisfies the load supplying voltage request, then drove triode Q7 saturation conduction, the relay J adhesive; The output output voltage of ratio amplifier U2B carries out self-locking through the anode B+ of diode D14 through resistance R 59 and resistance R 55 dividing potential drops input ratio amplifier U2B to relay simultaneously.
When if OVP voltage is higher than Vref1; the output output voltage of ratio amplifier U2B is 0V; no matter whether be at this moment ac zero-crossing point; the anode B+ of ratio amplifier U2B will be pulled low to low level 0V through diode D13; then the output of ratio amplifier U2B is output as low level 0V; disconnect relay J, play the circuit overvoltage protection, disconnect follow-up load circuit.
For integrated protection:
Relay contact is under the off-state, must satisfy alternating voltage and satisfy load request and simultaneously must be in the alternating current zero crossing state, and circuit is just with relay contact closure, otherwise any one condition do not satisfy, and relay contact can be closed.
Also increased the RelayDI control point in the circuit, this control point can be provided by optocoupler output by the Relay mouth that telecommunication is controlled among the IC.When Relay was high level, the positive input terminal A+ of ratio amplifier U2A was low level 0V, at this moment the output output low level of ratio amplifier U2A, ratio amplifier U2B positive input terminal B+ current potential is pulled low to 0V, the output output low level 0V of ratio amplifier U2B, the relay J contact disconnects, the load outage; When Relay was low level, the positive input terminal A+ of ratio amplifier U2A was Vref1, judge this moment alternating voltage whether overvoltage and alternating current whether be in nought state, relay J satisfying zero passage and satisfying load voltage state lower contact closed, powering load; So both protected the safety of follow-up load circuit, and improved simultaneously security performance and the useful life of relay, relay is controlled by telecommunication control unit simultaneously.
Claims (6)
1. one kind based on the load controller of crossing the zero start overvoltage protection; it is characterized in that, comprising: sample circuit, the zero cross detection circuit that is connected with sample circuit are connected the general protective circuit that is connected with over-voltage detection circuit with zero cross detection circuit and the bang-bang circuit that is connected with general protective circuit with over-voltage detection circuit.
2. the load controller based on crossing the zero start overvoltage protection according to claim 1, it is characterized in that: described over-voltage detection circuit is connected with buffer circuit.
3. the load controller based on crossing the zero start overvoltage protection according to claim 2 is characterized in that: described buffer circuit employing optical coupler.
4. the load controller based on crossing the zero start overvoltage protection according to claim 1, it is characterized in that: described zero cross detection circuit is comprised of two comparators, three resistance, two diodes and an electric capacity; Wherein, the negative electrode of diode D4 connects supply voltage, the anode of diode D4 links to each other with the normal phase input end of comparator U1A and receives zero signal, the inverting input of comparator U1A receives given reference voltage signal Vref1, the output of comparator U1A links to each other with an end of resistance R 48 and the anode of diode D10, another termination supply voltage of resistance R 48, one end of the negative electrode of diode D10 and resistance R 47, one end of resistance R 46 links to each other with an end of capacitor C 19, the other end of resistance R 47 links to each other with the other end of capacitor C 19 and ground connection, the other end of resistance R 46 links to each other with the inverting input of comparator U1B, the normal phase input end of comparator U1B receives given reference voltage signal Vref2, the output output zero passage enabling signal of comparator U1B.
5. the load controller based on crossing the zero start overvoltage protection according to claim 1, it is characterized in that: described over-voltage detection circuit is by two electric capacity, three resistance and a comparator; Wherein, the inverting input of comparator U2A links to each other with an end of capacitor C 34 and the receiver voltage signal; the other end of capacitor C 34 links to each other with an end of resistance R 37; another termination supply voltage of resistance R 37; the normal phase input end of comparator U2A links to each other and the receiving remote control signal with an end of resistance R 89, an end of resistance R 90 and an end of capacitor C 33; the other end of resistance R 89 receives given reference voltage signal Vref1; the other end ground connection of capacitor C 33, the other end of resistance R 90 link to each other with the output of comparator U2A and the output over-voltage protection signal.
6. the load controller based on crossing the zero start overvoltage protection according to claim 1, it is characterized in that: described general protective circuit is by two triodes, four diodes, six resistance, an electric capacity and a comparator; Wherein, one termination of capacitor C 21 is received the zero passage enabling signal; the other end of capacitor C 21 links to each other with an end of resistance R 50; one end of the other end of resistance R 50 and resistance R 51; one end of resistance R 52 links to each other with the negative electrode of diode D11; one end of the other end of resistance R 51 and resistance R 55; the emitter of the anode of diode D11 and triode Q5 links to each other and ground connection; the other end of resistance R 52 links to each other with the gate pole of triode Q5; the collector electrode of triode Q5 links to each other with an end of resistance R 53; the other end of resistance R 53 links to each other with the gate pole of triode Q6; the emitter of triode Q6 links to each other with the negative electrode of diode D13 and receives the overvoltage protection signal; the collector electrode of triode Q6 links to each other with the anode of diode D12; the anode of the negative electrode of diode D12 and diode D13; the other end of resistance R 55; one end of resistance R 59 links to each other with the normal phase input end of comparator U2B; the inverting input of comparator U2B receives given reference voltage signal Vref1; the output of comparator U2B links to each other with the anode of diode D14 and an end of resistance R 58; the negative electrode of diode D14 links to each other with the other end of resistance R 59, the other end output drive signal of resistance R 58.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220536509 CN202888791U (en) | 2012-10-19 | 2012-10-19 | Load controller based on zero-cross starting overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220536509 CN202888791U (en) | 2012-10-19 | 2012-10-19 | Load controller based on zero-cross starting overvoltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202888791U true CN202888791U (en) | 2013-04-17 |
Family
ID=48080182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220536509 Expired - Lifetime CN202888791U (en) | 2012-10-19 | 2012-10-19 | Load controller based on zero-cross starting overvoltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202888791U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913659A (en) * | 2014-03-30 | 2014-07-09 | 河北工业大学 | Instantaneous protection tester and operation method thereof |
| CN104466900A (en) * | 2014-12-10 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Input voltage overvoltage protection circuit |
| CN105490262A (en) * | 2016-01-15 | 2016-04-13 | 史晓平 | System and method for load monitoring of smart home |
| CN108120872A (en) * | 2017-12-27 | 2018-06-05 | 奥克斯空调股份有限公司 | A kind of protection system and method for three-phase electricity air-conditioner controller |
| CN108242794A (en) * | 2018-03-08 | 2018-07-03 | 厦门芯阳科技股份有限公司 | A kind of relay contact protection circuit of control inductive load |
| CN108696115A (en) * | 2018-07-31 | 2018-10-23 | 广州金升阳科技有限公司 | A kind of zero phase start-up circuit |
| WO2019000265A1 (en) * | 2017-06-28 | 2019-01-03 | 深圳配天智能技术研究院有限公司 | Detection circuit for servo driver and servo driver |
| CN109286179A (en) * | 2017-07-20 | 2019-01-29 | 光宝科技股份有限公司 | Low phase surge protecter |
| CN110133358A (en) * | 2019-05-15 | 2019-08-16 | 安徽亚辉电气自动化有限公司 | A kind of inhibition management system of overvoltage |
| CN114552525A (en) * | 2022-04-22 | 2022-05-27 | 四川力士达照明设备股份有限公司 | Integrated protection circuit and method based on isolated zero-crossing switch |
-
2012
- 2012-10-19 CN CN 201220536509 patent/CN202888791U/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913659A (en) * | 2014-03-30 | 2014-07-09 | 河北工业大学 | Instantaneous protection tester and operation method thereof |
| CN104466900A (en) * | 2014-12-10 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Input voltage overvoltage protection circuit |
| CN104466900B (en) * | 2014-12-10 | 2017-12-01 | 英飞特电子（杭州）股份有限公司 | A kind of input voltage overvoltage crowbar |
| CN105490262A (en) * | 2016-01-15 | 2016-04-13 | 史晓平 | System and method for load monitoring of smart home |
| WO2019000265A1 (en) * | 2017-06-28 | 2019-01-03 | 深圳配天智能技术研究院有限公司 | Detection circuit for servo driver and servo driver |
| CN109286179A (en) * | 2017-07-20 | 2019-01-29 | 光宝科技股份有限公司 | Low phase surge protecter |
| CN108120872A (en) * | 2017-12-27 | 2018-06-05 | 奥克斯空调股份有限公司 | A kind of protection system and method for three-phase electricity air-conditioner controller |
| CN108242794B (en) * | 2018-03-08 | 2023-05-23 | 厦门芯阳科技股份有限公司 | Relay contact protection circuit for controlling inductive load |
| CN108242794A (en) * | 2018-03-08 | 2018-07-03 | 厦门芯阳科技股份有限公司 | A kind of relay contact protection circuit of control inductive load |
| CN108696115A (en) * | 2018-07-31 | 2018-10-23 | 广州金升阳科技有限公司 | A kind of zero phase start-up circuit |
| CN108696115B (en) * | 2018-07-31 | 2024-02-13 | 广州金升阳科技有限公司 | Zero-phase starting circuit |
| CN110133358B (en) * | 2019-05-15 | 2021-02-02 | 安徽亚辉电气自动化有限公司 | Suppression management system of overvoltage |
| CN110133358A (en) * | 2019-05-15 | 2019-08-16 | 安徽亚辉电气自动化有限公司 | A kind of inhibition management system of overvoltage |
| CN114552525A (en) * | 2022-04-22 | 2022-05-27 | 四川力士达照明设备股份有限公司 | Integrated protection circuit and method based on isolated zero-crossing switch |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202888791U (en) | Load controller based on zero-cross starting overvoltage protection | |
| CN103000964B (en) | Controller of battery management system | |
| CN203056953U (en) | Driver and bus capacitor discharge circuit thereof | |
| CN103795050A (en) | High-voltage protection circuit, high-voltage protection method and power supply | |
| CN204967243U (en) | Current foldback circuit of variable frequency air conditioner and power factor correction PFC circuit | |
| CN103123882A (en) | Intelligent controller of bistable permanent-magnet vacuum circuit breaker | |
| CN103415107B (en) | Fire-protection emergency sign lamp | |
| CN110336354A (en) | The power control circuit of battery management system | |
| CN201075661Y (en) | Switch power source integrated with short-circuit protection and over low-voltage protection | |
| CN110429579B (en) | Reverse connection prevention protection circuit and method for improving safety and direct current power grid system | |
| CN101159372A (en) | Switch power source for digital relay protection | |
| CN201708532U (en) | Reverse connection and backflow preventing system for electric car charger | |
| CN102624019B (en) | Single-phase 660V-3.3KV long-distance distributed direct power supply system | |
| CN204424868U (en) | A kind of television set under-voltage protecting circuit | |
| CN203788514U (en) | Discharge control module, silicon controlled rectifier light dimming LED drive circuit and system | |
| CN203722330U (en) | Intelligent high-speed double-power-supply switching device | |
| CN207117155U (en) | Standby power-off energy-saving device of large-current starting equipment | |
| CN202524312U (en) | Switch power supply possessing alternating current 110/220V automatic switchover function | |
| CN209267179U (en) | A kind of electric power controller controlled by audio signal | |
| CN208754210U (en) | The control system of permanent magnet synchronous motor | |
| CN2891428Y (en) | Power supply unit | |
| CN204166102U (en) | A kind of strong electrically driven (operated) switch condition detection circuit | |
| CN110601346B (en) | Comprehensive motor protection controller with anti-interference function | |
| CN208836035U (en) | The control system of permanent magnet synchronous motor with position sensor | |
| CN208226558U (en) | A kind of motor protective circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |