CN101807792A - Power protection device - Google Patents
Power protection device Download PDFInfo
- Publication number
- CN101807792A CN101807792A CN201010176110A CN201010176110A CN101807792A CN 101807792 A CN101807792 A CN 101807792A CN 201010176110 A CN201010176110 A CN 201010176110A CN 201010176110 A CN201010176110 A CN 201010176110A CN 101807792 A CN101807792 A CN 101807792A
- Authority
- CN
- China
- Prior art keywords
- voltage
- links
- power supply
- stabiliser tube
- anode
- 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.)
- Granted
Links
Images
Landscapes
- Protection Of Static Devices (AREA)
Abstract
The embodiment of the application discloses a power protection device, which comprises an over-voltage detecting module, a current-limiting module, a control switch, a capacitance and a protection module, wherein two input ends of the over-voltage detecting module are respectively connected with a positive end and a negative end of an input power, and an output end is connected with a control end of the control switch; one end of the current-limiting module is connected with the positive end of the input power and serves as a positive input end of a driver, and the other end of the current-limiting module is respectively connected with one end of the control switch and one end of the capacitance; the other ends of the control switch and the capacitance are grounded; and a first end of the protection module is grounded, the control end is connected with one ungrounded end of the capacitance, and a second end serves as a negative input end of the driver. According to the embodiment of the application, the damage of the driver can be prevented when a subscriber connects a built-in driver of which the input power is a low-voltage DC power in the AC commercial power network by mistake.
Description
Technical field
The application relates to driving power, particularly relates to a kind of apparatus for protecting power supply.
Background technology
Traditional lamp system that is made of LED (Light Emitting Diode, light-emitting diode) adopts a kind of built-in driver to provide driving power for each LED usually, and the input power supply of this built-in driver is the electric main line voltage.See also Fig. 1, it is the structural representation of a kind of LED lamp system in the prior art.As shown in Figure 1, in this lamp system, because the power supply of led driver comes from the electric main line voltage, therefore, can have relatively high expectations to the insulating properties and the fire line of whole lamp system, for insulating properties and the fire line requirement of satisfying whole lamp system, need pay the higher cost cost.
In order to reduce cost, the input power supply of built-in driver can be changed into the safe low-voltage isolated with the electric main line voltage.See also Fig. 2, it is the structural representation of another kind of LED lamp system in the prior art.As shown in Figure 2, after the electric main line voltage is changed through ac/dc, be converted to safe low-voltage dc power supply, and low-voltage dc power supply that should safety is as the input power supply of built-in driver, thereby makes whole lamp system meet the requirement of the insulating properties and the fire line of security regulations.
At two kinds of lamp systems among Fig. 1 and Fig. 2, two kinds of built-in drivers are identical with the connecting interface of input power supply, that is, the input power supply is that the built-in driver of the electric main line voltage used connecting interface that is connected with to import power supply be the built-in driver of low-voltage dc power supply with separately input power supply is identical.In the operating process of reality, the user might be that the built-in driver of low-voltage dc power supply is connected in the electric main electrical network with the input power supply by mistake, and then causes drive corruption.
Summary of the invention
In order to solve the problems of the technologies described above, the embodiment of the present application provides a kind of apparatus for protecting power supply, to prevent that will import power supply when user mistake is the built-in driver of low-voltage dc power supply when being connected to the electric main electrical network, causes drive corruption.
The embodiment of the present application discloses following technical scheme:
A kind of apparatus for protecting power supply, comprise: an overvoltage detection module, a current limliting module, a control switch, an electric capacity and a protection module, wherein, two inputs of described overvoltage detection module link to each other with negative terminal with the anode of input power supply respectively, output links to each other with the control end of described control switch, with the voltage between two inputs of the described overvoltage detection module of box lunch during greater than normal low-tension supply value, make described control switch closure, otherwise, described control switch is disconnected; One end of described current limliting module links to each other with the anode of input power supply, and as the positive input of driver, the other end links to each other with an end of described control switch and electric capacity respectively; The other end ground connection of described control switch and electric capacity; The first end ground connection of described protection module; control end links to each other with the unearthed end of described electric capacity; second end is as the negative input of driver; so that when the voltage between two inputs of overvoltage detection module during greater than normal low-tension supply value; described control switch closure; capacitor discharge makes the control end of protection module and the voltage between first end less than second threshold values, and described protection module is not to the driver outputting drive voltage.
Preferably; also comprise: a clamp module; wherein; one end of described clamp module links to each other with the unearthed end of described electric capacity; other end ground connection; so that described clamp module is safe reverse voltage value with the control end and the reverse voltage clamp between first end of described protection module, perhaps, be safe forward voltage values with the control end and the forward voltage clamp between first end of described protection module.
Preferably, described overvoltage detection module comprises: diode (D1), resistance (R1), voltage-stabiliser tube (D2) and voltage-stabiliser tube (D3), wherein, the anode of diode (D1) links to each other with the anode of input power supply, negative pole links to each other with an end of resistance (R1), the other end of resistance (R1) links to each other with the negative electrode of voltage-stabiliser tube (D2), and the anode of voltage-stabiliser tube (D2) links to each other with the control end of described control switch and the negative electrode of voltage-stabiliser tube (D3) respectively, and the anode of voltage-stabiliser tube (D3) links to each other with the negative terminal of input power supply.
Preferably, described control switch is metal-oxide-semiconductor (S1), and wherein, the grid of metal-oxide-semiconductor (S1) links to each other with the negative electrode of voltage-stabiliser tube (D3), source ground, and drain electrode links to each other with described current limliting module.
Preferably, described control switch is triode (S1), and wherein, the base stage of triode (S1) links to each other with the negative electrode of voltage-stabiliser tube (D3), grounded emitter, and collector electrode links to each other with described current limliting module.
Preferably, described overvoltage detection module comprises: diode (D1), resistance (R1), voltage-stabiliser tube (D2), resistance (R3) and diode (D4), wherein, the anode of diode (D1) links to each other with the anode of input power supply, negative pole links to each other with an end of resistance (R1), the other end of resistance (R1) links to each other with the negative electrode of voltage-stabiliser tube (D2), the anode of voltage-stabiliser tube (D2) links to each other the other end ground connection of resistance (R3) other end and diode (D4) with the control end of described control switch, an end of resistance (R3) and an end of diode (D4) respectively.
Preferably, described control switch is triode (S3), and wherein, the base stage of triode (S3) links to each other with the anode of voltage-stabiliser tube (D2), grounded emitter, and collector electrode links to each other with described current limliting module.
Preferably, described overvoltage detection module comprises: resistance (R1), voltage-stabiliser tube (D2) and voltage-stabiliser tube (D3), wherein, one end of resistance (R1) links to each other with the anode of input power supply, the other end links to each other with the negative electrode of voltage-stabiliser tube (D2), the anode of voltage-stabiliser tube (D2) links to each other with the negative electrode of voltage-stabiliser tube (D3), and the anode of voltage-stabiliser tube (D3) links to each other with the negative terminal of input power supply.
Preferably, described control switch is triode (S3), and wherein, the base stage of triode (S3) links to each other with the anode of voltage-stabiliser tube (D2), grounded emitter, and collector electrode links to each other with described current limliting module.
Preferably, described control switch is metal-oxide-semiconductor (S1), and wherein, the grid of metal-oxide-semiconductor (S1) links to each other with the negative electrode of voltage-stabiliser tube (D3), source ground, and drain electrode links to each other with described current limliting module.
Preferably, described current limliting module comprises: resistance (R2), wherein, an end of resistance (R2) links to each other with the anode of input power supply, and as the positive input of driver, the other end links to each other with an end of described control switch and electric capacity respectively.
Preferably, described current limliting module comprises: diode (D1) and resistance (R2), wherein, the anode of diode (D1) links to each other with the anode of input power supply, and as the positive input of driver, negative electrode links to each other with an end of resistance (R2), and the other end of resistance (R2) links to each other with an end of described control switch and electric capacity respectively.
Preferably, described protection module is controllable silicon (S2), wherein, the minus earth of controllable silicon (S2), gate pole links to each other with the unearthed end of described electric capacity, and anode is as the negative input of driver.
Preferably, described clamp module is diode (D5), and wherein, the negative electrode of diode (D5) links to each other plus earth with the unearthed end of described electric capacity.
Preferably, described protection module comprises metal-oxide-semiconductor (S3) and diode (D6), wherein; the source ground of metal-oxide-semiconductor (S3); grid links to each other with the unearthed end of described electric capacity, and drain electrode links to each other with the negative electrode of diode (D6), and the anode of diode (D6) is as the negative input of driver.
Preferably, described clamp module is voltage-stabiliser tube (D7), and wherein, the negative electrode of voltage-stabiliser tube (D7) links to each other plus earth with the unearthed end of described electric capacity.
As can be seen from the above-described embodiment, compared with prior art, the application has following advantage:
When the user has carried out misoperation, making input voltage is the electric main line voltage, and when being in positive half period, under initial situation, because the magnitude of voltage between two inputs of overvoltage detection module is less than the low-voltage dc power supply value, therefore, the overvoltage detection module makes control switch be in off-state by control end.At this moment, input voltage charges to electric capacity by the current limliting module, if the capacitance voltage on the electric capacity, when promptly the voltage between the control end of protection module and first end was greater than or equal to second threshold value, protection module was to the driver outputting drive voltage.Because input voltage is an alternating current; after after a while; when the magnitude of voltage between two inputs of overvoltage detection module during greater than the low-voltage dc power supply value; the overvoltage detection module makes control switch be in closed condition by control end; at this moment, the electric capacity back discharge is when guaranteeing that input voltage is high-voltage alternating; voltage between the control end of protection module and first end is lower than second threshold value all the time, guarantees that finally protection module is not to the driver outputting drive voltage.
When the user has carried out misoperation, making input voltage is the electric main line voltage, and when being in negative half-cycle, because the magnitude of voltage between two inputs of overvoltage detection module is a negative voltage, it is less than the low-voltage dc power supply value, therefore, the overvoltage detection module makes control switch be in off-state by control end.At this moment, the capacitance voltage on the electric capacity is a low reverse voltage by clamp, and promptly the control end of protection module and first end do not bear excessive reverse voltage and damage, and protection module is not to the driver outputting drive voltage.To sum up, prevented that user's mistake from will import power supply is the drive corruption that the built-in driver of low-voltage dc power supply is caused when being connected to the electric main electrical network.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of LED lamp system in the prior art;
Fig. 2 is the structural representation of another kind of LED lamp system in the prior art;
Fig. 3 is the structure chart of an embodiment of a kind of apparatus for protecting power supply of the application;
Fig. 4 is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application;
Fig. 5 is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application;
Fig. 6 is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application;
Fig. 7 is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application;
Fig. 8 is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application;
Fig. 9 is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application;
Figure 10 is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application;
Figure 11 is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application.
Embodiment
Below in conjunction with drawings and Examples, the embodiment of the present application is described in detail.Should be appreciated that specific embodiment described herein only in order to explanation the application, and be not used in qualification the application.
Embodiment one
See also Fig. 3, it is the structure chart of an embodiment of a kind of apparatus for protecting power supply of the application, comprises overvoltage detection module 301, current limliting module 302, control switch 303, electric capacity 304 and protection module 305 wherein,
Two inputs of overvoltage detection module 301 link to each other with negative terminal with the anode of input power supply respectively, output links to each other with the control end of control switch 303, so that when the voltage between two inputs of overvoltage detection module 301 during greater than first threshold, make control switch 303 closures, otherwise, control switch is disconnected;
One end of current limliting module 302 links to each other with the anode of input power supply, and as the positive input of driver, the other end links to each other with an end of control switch 303 and electric capacity 304 respectively;
The other end ground connection of control switch 303 and electric capacity 304;
The first end ground connection of protection module 305; control end links to each other with electric capacity 304 unearthed ends; second end is as the negative input of driver; so that when the voltage between two inputs of overvoltage detection module during greater than normal low-tension supply value; described control switch closure; capacitor discharge makes the control end of protection module and the voltage between first end less than second threshold values, and described protection module is not to the driver outputting drive voltage.
At said structure; the operation principle of this apparatus for protecting power supply is: when input voltage is normal low-voltage dc power supply; voltage between two inputs of overvoltage detection module 301 is this low-voltage dc power supply value; because the magnitude of voltage between two inputs of overvoltage detection module 301 equals the low-voltage dc power supply value; therefore, overvoltage detection module 301 makes control switch 303 be in off-state by control end.At this moment; input voltage charges by 302 pairs of electric capacity 304 of current limliting module; owing to be charged with direct current; after the process certain time-delay; capacitance voltage on the electric capacity 304; be that the control end of protection module 305 and the voltage between first end tend towards stability, and when being greater than or equal to second threshold value, protection module 305 is to the driver outputting drive voltage.
Above-mentioned second threshold value can be set at trigger protection module 305 is sent threshold value from driving voltage to driver.
When the user has carried out misoperation, making input voltage is the electric main line voltage, and when being in positive half period, under initial situation, because the magnitude of voltage between two inputs of overvoltage detection module 301 is less than the low-voltage dc power supply value, therefore, overvoltage detection module 301 makes control switch 303 be in off-state by control end.At this moment; input voltage charges by 302 pairs of electric capacity 304 of current limliting module; if the capacitance voltage on the electric capacity 304, when promptly the voltage between the control end of protection module 305 and first end was greater than or equal to second threshold value, protection module 305 was to the driver outputting drive voltage.Because input voltage is an alternating current; after after a while; when the magnitude of voltage between two inputs of overvoltage detection module 301 during greater than the low-voltage dc power supply value; overvoltage detection module 301 makes control switch 303 be in closed condition by control end; at this moment, electric capacity 304 back discharges are when guaranteeing that input voltage is high-voltage alternating; voltage between the control end of protection module 305 and first end is lower than second threshold value all the time, guarantees that finally protection module 305 is not to the driver outputting drive voltage.
When the user has carried out misoperation, making input voltage is the electric main line voltage, and when being in negative half-cycle, because the magnitude of voltage between two inputs of overvoltage detection module 301 is a negative voltage, it is less than the low-voltage dc power supply value, therefore, overvoltage detection module 301 makes control switch 303 be in off-state by control end.Input voltage charges by 302 pairs of electric capacity 304 of current limliting module, at this moment, the capacitance voltage on the electric capacity 304, promptly the voltage between the control end of protection module 305 and first end is reverse negative voltage, protection module 305 is not to the driver outputting drive voltage.
Need to prove; when between the control end of protection module 305 and first end negative voltage is higher forward or backwards the time; might make the internal damage of protection module 305; for the damage that prevents that higher negative value forward or backwards from causing protection module 305; voltage protection can further include a clamp module 306; see also Fig. 4, it is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application.As shown in Figure 4; one end of clamp module 306 links to each other with electric capacity 304 unearthed ends; other end ground connection; so that clamp module 306 is safe reverse voltage value with the control end and the reverse voltage clamp between first end of protection module 305; perhaps, control end and the forward voltage clamp between first end with protection module 305 is safe forward voltage values.
As can be seen from the above-described embodiment, when the user has carried out misoperation, making input voltage is the electric main line voltage, and when being in positive half period, under initial situation, because the magnitude of voltage between two inputs of overvoltage detection module is less than the low-voltage dc power supply value, therefore, the overvoltage detection module makes control switch be in off-state by control end.At this moment, input voltage charges to electric capacity by the current limliting module, if the capacitance voltage on the electric capacity, when promptly the voltage between the control end of protection module and first end was greater than or equal to second threshold value, protection module was to the driver outputting drive voltage.Because input voltage is an alternating current; after after a while; when the magnitude of voltage between two inputs of overvoltage detection module during greater than the low-voltage dc power supply value; the overvoltage detection module makes control switch be in closed condition by control end; at this moment, the electric capacity back discharge is when guaranteeing that input voltage is high-voltage alternating; voltage between the control end of protection module and first end is lower than second threshold value all the time, guarantees that finally protection module is not to the driver outputting drive voltage.
When the user has carried out misoperation, making input voltage is the electric main line voltage, and when being in negative half-cycle, because the magnitude of voltage between two inputs of overvoltage detection module is a negative voltage, it is less than the low-voltage dc power supply value, therefore, the overvoltage detection module makes control switch be in off-state by control end.At this moment, the capacitance voltage on the electric capacity is a low negative voltage by pincers, and promptly the voltage between the control end of protection module and first end does not bear big reverse negative voltage and damages, and protection module is not to the driver outputting drive voltage.To sum up, prevented that user's mistake from will import power supply is the drive corruption that the built-in driver of low-voltage dc power supply is caused when being connected to the electric main electrical network.
Three kinds of application of apparatus for protecting power supply are described at the internal structure of apparatus for protecting power supply below.
Embodiment two
See also Fig. 5, it is the structure chart of another embodiment of the application's apparatus for protecting power supply, wherein; the overvoltage detection module comprises: diode D1, resistance R 1, voltage-stabiliser tube D2 and voltage-stabiliser tube D3; the current limliting module comprises: resistance R 2, control switch are metal-oxide-semiconductor S1, and protection module is controllable silicon S2.Wherein, the anode of diode D1 links to each other with the anode of input power supply, negative electrode links to each other with an end of resistance R 1, the other end of resistance R 1 links to each other with the negative electrode of voltage-stabiliser tube D2, the anode of voltage-stabiliser tube D2 links to each other with the negative electrode of metal-oxide-semiconductor S1 grid and voltage-stabiliser tube D3 respectively, the anode of voltage-stabiliser tube D3 links to each other with the negative terminal of input power supply, one end of resistance R 2 links to each other with the anode of input power supply, and as the positive input of driver, the other end links to each other with the drain electrode of metal-oxide-semiconductor S1 and an end of capacitor C 1 respectively, the grid of metal-oxide-semiconductor S1 links to each other with the negative electrode of voltage-stabiliser tube D3, source ground, drain electrode links to each other the minus earth of controllable silicon S2 with the gate pole of controllable silicon S2, gate pole links to each other with capacitor C 1 a unearthed end, and anode is as the negative input of driver.
At said structure; the operation principle of this apparatus for protecting power supply is: when input voltage is normal low-voltage direct; metal-oxide-semiconductor S1 is in off-state; input voltage charges to capacitor C 1 by resistance R 2; through after the certain time-delay; the voltage of capacitor C 1 reaches the threshold voltage of controllable silicon S2 conducting, controllable silicon S2 conducting, led driver operate as normal.
When input voltage is high-voltage alternating; if input voltage is in positive half period; input voltage charges to capacitor C 1 by resistance R 2; when input voltage surpasses the protection electrical voltage point of setting, voltage-stabiliser tube D2, D3 conducting, control metal-oxide-semiconductor S1 closure; metal-oxide-semiconductor S1 is to capacitor C 1 discharge; voltage on the gate pole of controllable silicon S2 is lower than its threshold voltage all the time, makes controllable silicon S2 keep off-state, is protected thereby led driver and AC network are disconnected.
When input voltage is high-voltage alternating, if input voltage is in negative half-cycle, diode current flow in the body of metal-oxide-semiconductor S1, controllable silicon S2 bears back-pressure and is in off-state.Simultaneously, the diode D1 in the overvoltage detection module bears reverse input voltage, and the gate-source voltage of voltage-stabiliser tube D3 protection metal-oxide-semiconductor S1 excessive reverse voltage can not occur and damage.
Need to prove; structure at above-mentioned apparatus for protecting power supply; when input voltage is reverse negative voltage, though apparatus for protecting power supply can't provide driving power to driver; still can on resistance R 2, consume certain power; in order to reduce such power consumption loss, preferred, can further insert a diode D0; the anode of this diode D0 links to each other with the anode of input power supply, and negative electrode links to each other with an end of resistance R 2.See also Fig. 6, it is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application.As shown in Figure 6, when input voltage was reverse negative voltage, diode D0 oppositely ended, and the electric current on the resistance R 2 is zero, therefore, has avoided the power loss on the resistance R 2.
Further preferred, above-mentioned diode D0 can be substituted by the diode D1 in the overvoltage detection module, that is, diode D1 has been carried out multiplexing, and diode D1 is promptly as the part in the overvoltage detection module, again as the part of current limliting module.See also Fig. 7, it is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application.
Need to prove that also control switch can also be a triode except being the metal-oxide-semiconductor S1, wherein, the base stage of triode links to each other with the negative electrode of voltage-stabiliser tube D3, grounded emitter, and collector electrode links to each other with described current limliting module.For the damage that prevents that higher reverse negative value from causing protection module; voltage protection can further include a clamp module, and described clamp module is a diode, wherein; the negative electrode of diode links to each other plus earth with capacitor C 1 a unearthed end.
Also need to prove; protection module is except can being the controllable silicon S2; can also form by metal-oxide-semiconductor S3 and diode D6; wherein; the source ground of metal-oxide-semiconductor S3; grid links to each other with capacitor C 1 a unearthed end, and drain electrode links to each other with the negative electrode of diode D6, and the anode of diode D6 is as the negative input of driver.When protection module is made up of metal-oxide-semiconductor S3 and diode D6; the clamp module is a voltage-stabiliser tube, the plus earth of voltage-stabiliser tube, and negative electrode connects the grid of metal-oxide-semiconductor; when being input as normal low-voltage DC, the voltage of voltage-stabiliser tube clamp metal-oxide-semiconductor grid and drain electrode is the driving voltage of safety.
Embodiment three
See also Fig. 8; it is the structure chart of another embodiment of the application's apparatus for protecting power supply; wherein; the overvoltage detection module comprises: diode D1, resistance R 1, voltage-stabiliser tube D2, resistance R 3 and diode D4; the current limliting module comprises: diode D1 and resistance R 2; control switch is triode S3, and protection module is controllable silicon S2.The anode of diode D1 links to each other with the anode of input power supply, negative electrode links to each other with an end of resistance R 1, the other end of resistance R 1 links to each other with the negative electrode of voltage-stabiliser tube D2, the anode of voltage-stabiliser tube D2 respectively with the base stage of triode S3, one end of resistance R 3 links to each other with the negative electrode of diode D4, the plus earth of resistance R 3 other ends and diode D4, the anode of diode D1 links to each other with the anode of input power supply, and as the positive input of driver, negative electrode links to each other with an end of resistance R 2, the other end of resistance R 2 links to each other with the collector electrode of triode S3 and an end of capacitor C 1 respectively, the base stage of triode S3 links to each other with the anode of voltage-stabiliser tube D2, grounded emitter, collector electrode links to each other with the gate pole of controllable silicon S2, the minus earth of controllable silicon S2, gate pole links to each other with capacitor C 1 a unearthed end, and anode is as the negative input of driver.
Need to prove that at the structure of above-mentioned apparatus for protecting power supply, diode D1 has been carried out multiplexing, diode D1 is promptly as the part in the overvoltage detection module, again as the part of current limliting module.When input voltage was reverse negative voltage, diode D1 oppositely ended, and the electric current on the resistance R 2 is zero, therefore, has avoided the power loss on the resistance R 2.
Certainly, also can directly insert a diode D0 again, the anode of this diode D0 links to each other with the anode of input power supply, and negative electrode links to each other with an end of resistance R 2.See also Fig. 9, it is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application.As shown in Figure 9, when input voltage was reverse negative voltage, diode D0 oppositely ended, and the electric current on the resistance R 2 is zero, therefore, has avoided the power loss on the resistance R 2.
In addition; protection module is except can being the controllable silicon S2; can also form by metal-oxide-semiconductor S3 and diode D6; wherein; the source ground of metal-oxide-semiconductor S3; grid links to each other with capacitor C 1 a unearthed end, and drain electrode links to each other with the negative electrode of diode D6, and the anode of diode D6 is as the negative input of driver.When protection module is made up of metal-oxide-semiconductor S3 and diode D6,, the clamp module is a voltage-stabiliser tube; the plus earth of voltage-stabiliser tube; negative electrode connects the grid of metal-oxide-semiconductor, and when being input as the forward low-voltage DC, voltage-stabiliser tube clamp metal-oxide-semiconductor grid building pole tension is the driving voltage of safety.When being input as the High Level AC Voltage negative half-cycle, voltage-stabiliser tube is that a low negative voltage does not damage because of bearing big reverse voltage with protection metal-oxide-semiconductor grid leak pole tension with the voltage of pincers metal-oxide-semiconductor grid and drain electrode.
Further; for when the control end of protection module and the reverse negative voltage between first end are higher; might make the internal damage of protection module; for the damage that prevents that higher reverse negative value from causing protection module; voltage protection can further include a clamp module; described clamp module is diode D5, sees also Figure 10, and it is the structure chart of another embodiment of a kind of apparatus for protecting power supply of the application.Wherein, the negative electrode of diode D5 links to each other plus earth with capacitor C 1 a unearthed end.
Embodiment four
See also Figure 11; it is the structure chart of another embodiment of the application's apparatus for protecting power supply, and the overvoltage detection module comprises: resistance R 1, voltage-stabiliser tube D2 and voltage-stabiliser tube D3, and the current limliting module comprises: resistance R 1; control switch is metal-oxide-semiconductor S1, and protection module is controllable silicon S2.Wherein, one end of resistance R 1 links to each other with the anode of input power supply, the other end links to each other with the negative electrode of voltage-stabiliser tube D2, the anode of voltage-stabiliser tube D2 links to each other with the negative electrode of voltage-stabiliser tube D3, the anode of voltage-stabiliser tube D3 links to each other with the negative terminal of input power supply, the grid of metal-oxide-semiconductor S1 links to each other with the negative electrode of voltage-stabiliser tube D3, source ground, drain electrode links to each other with the gate pole of controllable silicon S2, an end of capacitor C 1 and the negative electrode of voltage-stabiliser tube D2 respectively, the other end ground connection of capacitor C 1, the minus earth of controllable silicon S2, gate pole links to each other with capacitor C 1 a unearthed end, and anode is as the negative input of driver.
At said structure; the operation principle of this apparatus for protecting power supply is: when input voltage is normal low-voltage direct; metal-oxide-semiconductor S 1 is in off-state; input voltage charges to capacitor C 1 by resistance R 1; through after the certain time-delay; the voltage of capacitor C 1 reaches the threshold voltage of controllable silicon S2 conducting, controllable silicon S2 conducting, led driver operate as normal.
When input voltage is high-voltage alternating; if input voltage is in positive half period; input voltage charges to capacitor C 1 by resistance R 1; when input voltage surpasses the protection electrical voltage point of setting, voltage-stabiliser tube D1, D2 conducting, control metal-oxide-semiconductor S1 closure; metal-oxide-semiconductor S1 is to capacitor C 1 discharge; the gate voltage of controllable silicon S2 is lower than threshold voltage all the time, makes controllable silicon S2 keep off-state, is protected thereby led driver and AC network are disconnected.
When input voltage is high-voltage alternating; if input voltage is in negative half-cycle; controllable silicon S2 bears back-pressure and is in off-state; the endobiosis diode protection silicon controlled gate pole of metal-oxide-semiconductor S1 does not bear big reverse voltage and damages, and the gate-source voltage of voltage-stabiliser tube D2 protection metal-oxide-semiconductor S1 excessive reverse voltage can not occur and damage.
Need to prove that present embodiment has carried out multiplexing to resistance R 1, both as the part of overvoltage detection module, again as the current limliting module.In addition, present embodiment can also adopt a resistance R 2 as the current limliting module separately.
In addition, control switch can also be triode S3 except being the metal-oxide-semiconductor S1, wherein, the base stage of triode S3 links to each other with the negative electrode of voltage-stabiliser tube D3, grounded emitter, and collector electrode links to each other with the gate pole of controllable silicon S2, an end of capacitor C 1 and the negative electrode of voltage-stabiliser tube D2 respectively.
Protection module can also be made up of metal-oxide-semiconductor S3 and diode D6, wherein except being the controllable silicon S2; the source ground of metal-oxide-semiconductor S3; grid links to each other with capacitor C 1 a unearthed end, and drain electrode links to each other with the negative electrode of diode D6, and the anode of diode D6 is as the negative input of driver.When protection module is made up of metal-oxide-semiconductor S3 and diode D6,, clamp circuit is a voltage-stabiliser tube; the plus earth of voltage-stabiliser tube; negative electrode connects the grid of metal-oxide-semiconductor, and when being input as normal low-voltage DC, the voltage of voltage-stabiliser tube clamp metal-oxide-semiconductor grid and drain electrode is the driving voltage of safety.
Further; for when the control end of protection module and the reverse negative voltage between first end are higher; might make the internal damage of protection module; for the damage that prevents that higher reverse negative value from causing protection module; voltage protection can further include a clamp module, and described clamp module is diode D5.
More than a kind of apparatus for protecting power supply that the application provided is described in detail, used specific embodiment herein the application's principle and execution mode are set forth, the explanation of above embodiment just is used to help to understand the application's method and core concept thereof; Simultaneously, for one of ordinary skill in the art, under the principle prerequisite that does not break away from the present invention's description, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (16)
1. an apparatus for protecting power supply is characterized in that, comprising: an overvoltage detection module, a current limliting module, a control switch, an electric capacity and a protection module, wherein,
Two inputs of described overvoltage detection module link to each other with negative terminal with the anode of input power supply respectively, output links to each other with the control end of described control switch, with the voltage between two inputs of the described overvoltage detection module of box lunch during greater than normal low-tension supply value, make described control switch closure, otherwise, described control switch is disconnected;
One end of described current limliting module links to each other with the anode of input power supply, and as the positive input of driver, the other end links to each other with an end of described control switch and electric capacity respectively;
The other end ground connection of described control switch and electric capacity;
The first end ground connection of described protection module; control end links to each other with the unearthed end of described electric capacity; second end is as the negative input of driver; so that when the voltage between two inputs of overvoltage detection module during greater than normal low-tension supply value; described control switch closure; capacitor discharge makes the control end of protection module and the voltage between first end less than second threshold values, and described protection module is to the moving voltage of driver output Ma Qu.
2. apparatus for protecting power supply according to claim 1 is characterized in that, also comprises: a clamp module, wherein,
One end of described clamp module links to each other with the unearthed end of described electric capacity; other end ground connection; so that described clamp module is safe reverse voltage value with the control end and the reverse voltage clamp between first end of described protection module; perhaps, control end and the forward voltage clamp between first end with described protection module is safe forward voltage values.
3. apparatus for protecting power supply according to claim 1 and 2 is characterized in that, described overvoltage detection module comprises: diode (D1), resistance (R1), voltage-stabiliser tube (D2) and voltage-stabiliser tube (D3), wherein,
The anode of diode (D1) links to each other with the anode of input power supply, negative pole links to each other with an end of resistance (R1), the other end of resistance (R1) links to each other with the negative electrode of voltage-stabiliser tube (D2), the anode of voltage-stabiliser tube (D2) links to each other with the control end of described control switch and the negative electrode of voltage-stabiliser tube (D3) respectively, and the anode of voltage-stabiliser tube (D3) links to each other with the negative terminal of input power supply.
4. apparatus for protecting power supply according to claim 3 is characterized in that, described control switch is metal-oxide-semiconductor (S1), wherein,
The grid of metal-oxide-semiconductor (S1) links to each other with the negative electrode of voltage-stabiliser tube (D3), source ground, and drain electrode links to each other with described current limliting module.
5. apparatus for protecting power supply according to claim 3 is characterized in that, described control switch is triode (S1), wherein,
The base stage of triode (S1) links to each other with the negative electrode of voltage-stabiliser tube (D3), grounded emitter, and collector electrode links to each other with described current limliting module.
6. apparatus for protecting power supply according to claim 1 and 2 is characterized in that, described overvoltage detection module comprises: diode (D1), resistance (R1), voltage-stabiliser tube (D2), resistance (R3) and diode (D4), wherein,
The anode of diode (D1) links to each other with the anode of input power supply, negative pole links to each other with an end of resistance (R1), the other end of resistance (R1) links to each other with the negative electrode of voltage-stabiliser tube (D2), the anode of voltage-stabiliser tube (D2) links to each other the other end ground connection of resistance (R3) other end and diode (D4) with the control end of described control switch, an end of resistance (R3) and an end of diode (D4) respectively.
7. apparatus for protecting power supply according to claim 6 is characterized in that, described control switch is triode (S3), wherein,
The base stage of triode (S3) links to each other with the anode of voltage-stabiliser tube (D2), grounded emitter, and collector electrode links to each other with described current limliting module.
8. apparatus for protecting power supply according to claim 1 and 2 is characterized in that, described overvoltage detection module comprises: resistance (R1), voltage-stabiliser tube (D2) and voltage-stabiliser tube (D3), wherein,
One end of resistance (R1) links to each other with the anode of input power supply, and the other end links to each other with the negative electrode of voltage-stabiliser tube (D2), and the anode of voltage-stabiliser tube (D2) links to each other with the negative electrode of voltage-stabiliser tube (D3), and the anode of voltage-stabiliser tube (D3) links to each other with the negative terminal of input power supply.
9. apparatus for protecting power supply according to claim 8 is characterized in that, described control switch is triode (S3), wherein,
The base stage of triode (S3) links to each other with the anode of voltage-stabiliser tube (D2), grounded emitter, and collector electrode links to each other with described current limliting module.
10. apparatus for protecting power supply according to claim 8 is characterized in that, described control switch is metal-oxide-semiconductor (S1), wherein,
The grid of metal-oxide-semiconductor (S1) links to each other with the negative electrode of voltage-stabiliser tube (D3), source ground, and drain electrode links to each other with described current limliting module.
11. apparatus for protecting power supply according to claim 1 and 2 is characterized in that, described current limliting module comprises: resistance (R2), wherein,
One end of resistance (R2) links to each other with the anode of input power supply, and as the positive input of driver, the other end links to each other with an end of described control switch and electric capacity respectively.
12. apparatus for protecting power supply according to claim 1 and 2 is characterized in that, described current limliting module comprises: diode (D1) and resistance (R2), wherein,
The anode of diode (D1) links to each other with the anode of input power supply, and as the positive input of driver, negative electrode links to each other with an end of resistance (R2), and the other end of resistance (R2) links to each other with an end of described control switch and electric capacity respectively.
13. apparatus for protecting power supply according to claim 1 and 2 is characterized in that, described protection module is controllable silicon (S2), wherein,
The minus earth of controllable silicon (S2), gate pole links to each other with the unearthed end of described electric capacity, and anode is as the negative input of driver.
14. apparatus for protecting power supply according to claim 13 is characterized in that, described clamp module is diode (D5), and wherein, the negative electrode of diode (D5) links to each other plus earth with the unearthed end of described electric capacity.
15. apparatus for protecting power supply according to claim 1 and 2 is characterized in that, described protection module comprises metal-oxide-semiconductor (S3) and diode (D6), wherein,
The source ground of metal-oxide-semiconductor (S3), grid links to each other with the unearthed end of described electric capacity, and drain electrode links to each other with the negative electrode of diode (D6), and the anode of diode (D6) is as the negative input of driver.
16. apparatus for protecting power supply according to claim 15 is characterized in that, described clamp module is voltage-stabiliser tube (D7), and wherein, the negative electrode of voltage-stabiliser tube (D7) links to each other plus earth with the unearthed end of described electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101761105A CN101807792B (en) | 2010-05-12 | 2010-05-12 | Power protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101761105A CN101807792B (en) | 2010-05-12 | 2010-05-12 | Power protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101807792A true CN101807792A (en) | 2010-08-18 |
| CN101807792B CN101807792B (en) | 2012-08-29 |
Family
ID=42609450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101761105A Active CN101807792B (en) | 2010-05-12 | 2010-05-12 | Power protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101807792B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166210A (en) * | 2011-12-19 | 2013-06-19 | 隆达电子股份有限公司 | Overvoltage protection circuit and drive circuit |
| CN103545803A (en) * | 2013-10-31 | 2014-01-29 | 广东威创视讯科技股份有限公司 | Protective device of equipment power source interface circuit |
| CN105186843A (en) * | 2015-09-01 | 2015-12-23 | 青岛海信电器股份有限公司 | Protective circuit, feedback unit and backlight drive circuit |
| CN108832601A (en) * | 2018-09-03 | 2018-11-16 | 北京有感科技有限责任公司 | A kind of overvoltage crowbar and its application |
| CN109888764A (en) * | 2019-03-15 | 2019-06-14 | 广东人和照明实业有限公司 | A kind of overvoltage crowbar and its Projecting Lamp |
| CN110460031A (en) * | 2019-08-07 | 2019-11-15 | 中国电子科技集团公司第五十二研究所 | A kind of exchange of direct current supply interface is electrically accessed protection circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201252396Y (en) * | 2008-07-30 | 2009-06-03 | 东莞市石龙富华电子有限公司 | Overvoltage protective circuit for inputted high voltage of switch power supply |
| CN201708544U (en) * | 2010-05-12 | 2011-01-12 | 英飞特电子（杭州）有限公司 | Power supply protection device |
-
2010
- 2010-05-12 CN CN2010101761105A patent/CN101807792B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166210A (en) * | 2011-12-19 | 2013-06-19 | 隆达电子股份有限公司 | Overvoltage protection circuit and drive circuit |
| CN103545803A (en) * | 2013-10-31 | 2014-01-29 | 广东威创视讯科技股份有限公司 | Protective device of equipment power source interface circuit |
| CN103545803B (en) * | 2013-10-31 | 2016-08-17 | 广东威创视讯科技股份有限公司 | Device power supply (DPS) interface circuit protection device |
| CN105186843A (en) * | 2015-09-01 | 2015-12-23 | 青岛海信电器股份有限公司 | Protective circuit, feedback unit and backlight drive circuit |
| CN108832601A (en) * | 2018-09-03 | 2018-11-16 | 北京有感科技有限责任公司 | A kind of overvoltage crowbar and its application |
| CN109888764A (en) * | 2019-03-15 | 2019-06-14 | 广东人和照明实业有限公司 | A kind of overvoltage crowbar and its Projecting Lamp |
| CN110460031A (en) * | 2019-08-07 | 2019-11-15 | 中国电子科技集团公司第五十二研究所 | A kind of exchange of direct current supply interface is electrically accessed protection circuit |
| CN110460031B (en) * | 2019-08-07 | 2021-11-30 | 中国电子科技集团公司第五十二研究所 | Alternating current access protection circuit of direct current power supply interface |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101807792B (en) | 2012-08-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101807792B (en) | Power protection device | |
| CN103345903B (en) | A kind of LED backlight system and display device | |
| CN103872658B (en) | Multifunction self-resetting formula is crossed, under-voltage protector | |
| CN107069655A (en) | A kind of voltage protection circuit | |
| CN103036196A (en) | Device for overvoltage protection and method thereof | |
| CN104768258B (en) | Constant-current driving LED overcurrent-overvoltage protecting circuit | |
| CN207117156U (en) | A kind of voltage protection circuit | |
| CN103024973A (en) | LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof | |
| CN103346553A (en) | Reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit of electronic controller | |
| CN203104871U (en) | Intelligently controlled DALI (digital addressable lighting interface) dimming control device | |
| CN102638024A (en) | Neutral line break protector | |
| CN202424157U (en) | LED output protection circuit | |
| CN201708544U (en) | Power supply protection device | |
| CN209375126U (en) | A kind of surge current suppression circuit | |
| CN104528559B (en) | Tower crane system and tower crane rotation vortex flow controller | |
| CN103025029A (en) | Improved buffering and current limiting circuit for direct-current power source of LED lamp | |
| CN207117586U (en) | A kind of metal-oxide-semiconductor current foldback circuit | |
| CN203119475U (en) | Anti-inductive-lightning circuit and outdoor lamp | |
| CN109729613A (en) | A kind of constant current Drive Protecting Circuit, protective device and television set | |
| CN201590934U (en) | Ultraviolet lamp failure detection circuit and device | |
| CN213817234U (en) | Protection circuit for AC220V equipment connected to AC380V | |
| CN107395175A (en) | A kind of metal-oxide-semiconductor current foldback circuit | |
| CN204350428U (en) | Dali input protection circuit | |
| CN103247269A (en) | LED backlight and liquid crystal display device | |
| CN102288808A (en) | LED (light-emitting diode) over-current detection circuit and LED driving control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee after: LED One (Hangzhou) Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee before: Inventronics (Hangzhou) Co., Ltd. |