CN110890741A - Circuit, operation method thereof, corresponding car lamp and car - Google Patents
Circuit, operation method thereof, corresponding car lamp and car Download PDFInfo
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- CN110890741A CN110890741A CN201811041764.XA CN201811041764A CN110890741A CN 110890741 A CN110890741 A CN 110890741A CN 201811041764 A CN201811041764 A CN 201811041764A CN 110890741 A CN110890741 A CN 110890741A
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- 239000003990 capacitor Substances 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 2
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- 230000000694 effects Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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Abstract
The present invention is directed to a circuit, method of operating the same, and corresponding vehicle lamp and vehicle, and an object of one embodiment is to handle a harsh voltage waveform that may occur, thereby more effectively protecting the corresponding operating circuit. According to a circuit 100 of the present invention, the circuit 100 comprises: a first voltage clamping portion 110; and a second voltage clamping portion 120; wherein, the first voltage clamping part 110 clamps the reverse voltage of the circuit; the second voltage clamping part 120 can clamp the forward voltage in the circuit.
Description
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to a circuit for protecting an electronic device, a method for operating the same, and a corresponding vehicle lamp and vehicle.
Background
In a vehicle-mounted power supply environment, the automobile electronic equipment may have a sudden interruption and the like due to various reasons such as starting ignition of an internal combustion engine of an automobile, inductive load disconnection, parallel load current and the like, so that the actual input voltage waveform of a power supply of the automobile electronic equipment is poor. For example, the ISO7637-2 standard simulates the input voltage waveform of some power supplies in severe conditions, however, while some circuits can handle severe waveforms in this standard, problems exist with respect to more severe input voltage waveforms that may otherwise occur. Particularly, for waveforms under certain vehicle series standards, the response effect of the currently used circuit is not ideal.
The pulse current caused by the instantaneous reverse voltage not only affects the circuit performance, but also may damage or even destroy the circuit elements.
Disclosure of Invention
In view of the above, one of the problems solved by an embodiment of the present invention is to process a bad voltage waveform that may occur, thereby more effectively protecting the corresponding operating circuit.
According to an embodiment of the invention, there is provided a circuit 100, the circuit 100 comprising:
a first voltage clamping portion 110; and
a second voltage clamping portion 120; wherein, the first voltage clamping part 110 clamps the reverse voltage of the circuit; the second voltage clamping part 120 can clamp the forward voltage in the circuit.
According to the scheme of this embodiment, can both realize effectual clamp system to reverse voltage and forward voltage, avoid because the problem that the voltage is too big causes.
According to an aspect of the present embodiment, when the reverse voltage is greater than the predetermined voltage clamping value of the circuit 100, the first voltage clamping part 110 clamps the reverse voltage at the predetermined voltage clamping value; when the reverse voltage is smaller than the predetermined voltage-clamping value, the first voltage-clamping part 110 is turned off to turn off the circuit 100.
According to the scheme of the embodiment, the reverse voltage, especially the instantaneous reverse voltage, can be effectively clamped, and when the reverse voltage is smaller than the preset clamping value, the circuit is disconnected, so that the reverse voltage is prevented from damaging elements in the circuit.
According to another aspect of the present embodiment, the circuit input terminal 1001 of the circuit 100 is connected to the first input terminal 1101 of the first voltage-clamping section 110, the first output terminal 1101 of the first voltage-clamping section 110 is connected to the second input terminal 1201 of the second voltage-clamping section 120, and the second output terminal 1202 of the second voltage-clamping section 120 is connected to the circuit output terminal 1002 of the circuit 100.
According to the scheme of the embodiment, the first voltage clamping part 110 is connected in series with the second voltage clamping part 120, so that the whole circuit 100 can be disconnected when the first voltage clamping part 110 is turned off.
According to another aspect of the present embodiment, the first voltage clamping portion 110 includes a first unidirectional TVS, and the second voltage clamping portion includes a second unidirectional TVS, wherein the first input 1101 of the first unidirectional TVS is connected to the circuit input 1001 of the circuit 100, the first output 1102 of the first unidirectional TVS is connected to the second input 1201 of the second unidirectional TVS, and the second output 1202 of the second unidirectional TVS is connected to the circuit output 1002 of the circuit 100.
According to the scheme of the embodiment, the clamping of the reverse voltage and the forward voltage is realized by fully utilizing the element characteristics of the unidirectional TVS.
According to yet another aspect of the present embodiment, the circuit 100 further includes an auxiliary portion 130 for assisting in protecting the circuit 100.
According to the scheme of the embodiment, the auxiliary part is used for realizing other improvement effects on the circuit, for example, elements in the circuit can be protected, the influence on the circuit, such as ESD and leakage, is reduced, and the stability of the circuit is ensured.
According to another aspect of the present embodiment, the circuit 100 further includes another protection portion 140, one end of the another protection portion 140 is connected to the output terminal 1102 of the first voltage clamping portion 110 and the input terminal 1201 of the second voltage clamping portion 120, and the other end of the another protection portion 140 is connected to the output terminal 1202 of the second voltage clamping portion 120.
According to yet another aspect of the present embodiment, the other protection part 140 includes a load dump protection circuit.
According to yet another aspect of this embodiment, the load dump protection circuit is implemented based on NMOS or PMOS.
According to the scheme of the embodiment, the other protection parts comprise circuits for protecting other severe waveforms, and the circuits according to the scheme can conveniently comprise the other protection parts, so that the circuits capable of dealing with various severe waveforms are realized. Especially for the common load throwing protection circuit, the protection circuit can be easily combined, and the original protection function can still be realized.
According to another aspect of the present embodiment, the circuit 100 can be connected to an operating circuit 200, wherein an input of the operating circuit 200 is connected to the second input terminal 1201 of the second voltage clamping portion 120, and an output of the operating circuit 200 is connected to the second output terminal 1202 of the second voltage clamping portion 120.
According to a further embodiment of the present invention, a method of operating a circuit 100 is provided, wherein the circuit 100 is as described in the previous embodiments, wherein the method comprises the steps of:
applying a reverse voltage to the circuit 100, wherein when the reverse voltage is greater than the predetermined voltage value, the second voltage clamping part 120 is turned on, and the first voltage clamping part 110 clamps the reverse voltage at the predetermined voltage value; when the reverse voltage is smaller than the predetermined voltage-clamping value, the first voltage-clamping part 110 is turned off to turn off the circuit 100.
According to one aspect of this embodiment, the method further comprises the steps of:
applying a forward voltage to the circuit 100, wherein the first voltage clamping part 110 is turned on and the second voltage clamping part 120 clamps the forward voltage.
According to the scheme of the embodiment, when the forward voltage is over-voltage, the corresponding working circuit is protected, and the normal work of the working circuit is realized.
According to an aspect of the present invention, there is provided a vehicle lamp including the circuit 100.
According to yet another aspect of the present invention, there is provided a vehicle including the lamp.
Compared with the prior art, the invention has the following advantages: according to the mode of the invention, the requirement on the voltage resistance of elements in the circuit is reduced, so that the cost of the whole circuit is reduced, and meanwhile, a better protection function for field attenuation pulses and instantaneous reverse voltages with similar waveforms can be realized. The normal operation of the vehicle-mounted electronic equipment is ensured.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 shows a circuit schematic of a circuit according to an embodiment of the invention;
FIG. 2 shows a circuit schematic of a circuit according to yet another embodiment of the invention;
FIG. 3 shows a circuit schematic of a circuit according to yet another embodiment of the invention;
FIG. 4 shows a circuit schematic including load dump protection according to yet another embodiment of the invention;
FIG. 5 illustrates yet another circuit schematic including load shedding protection according to yet another embodiment of the present invention;
fig. 6 shows a waveform diagram of a reverse voltage pulse according to an embodiment of the invention.
List of reference numerals:
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The circuit is used for protecting the vehicle-mounted electronic equipment under the condition of severe waveforms.
Preferably, the circuit according to the invention is comprised in a lamp of a vehicle.
The severe waveform according to the scheme has at least one of the following characteristics:
1) the reverse voltage wave peak value is large;
2) the reverse voltage is long in duration.
Preferably, refer to fig. 6. Fig. 6 illustrates a voltage waveform diagram to which the circuit according to the invention is adapted.
In the pulse shown in fig. 6, Vs is its reverse peak, Vp is the reverse voltage when the pulse starts to decay after its reverse peak, ta is the duration of Vs, tb is the duration of Vp decaying to 0, tc is the duration of 0v, and td is the field decay pulse period time.
More specifically, the pulse period td is 2s, the Vs can be up to-600V at most, the duration ta can be 0.1-1.5 ms, the Vs can be about-120V-100V, the duration tb can be about 20ms at most, and the tc can be about 15 ms.
It will be understood by those skilled in the art that the bad waveform is not limited to the waveform shown in fig. 6, but also includes all waveforms satisfying the above conditions 1) and 2), or the same or similar waveforms as those of fig. 6.
Referring to fig. 1, fig. 1 illustrates a circuit schematic of a circuit according to an embodiment of the invention.
The circuit 100 shown in fig. 1 includes a first voltage clamping section 110 and a second voltage clamping section 120. Wherein, the first voltage clamping part 110 clamps the reverse voltage of the circuit; the second voltage clamping part 120 can clamp the forward voltage in the circuit.
According to the method of the present invention, a reverse voltage is applied to the circuit 100, when the reverse voltage is greater than the predetermined voltage value, the second voltage clamping part 120 is turned on, and the first voltage clamping part 110 clamps the reverse voltage at the predetermined voltage value; when the reverse voltage is smaller than the predetermined voltage-clamping value, the first voltage-clamping part 110 is turned off to turn off the circuit 100.
When a forward voltage is applied to the circuit 100, the first voltage clamping part 110 is turned on, and when the forward voltage is greater than a voltage clamping value of the second voltage clamping part 120, the second voltage clamping part 120 clamps the forward voltage.
The predetermined clamping value may be determined based on the component model parameter corresponding to the first clamping portion 110.
Preferably, when the second voltage clamping part includes a voltage clamping part for a reverse voltage, the predetermined voltage clamping value may be determined based on model parameters of elements corresponding to the first voltage clamping part 110 and the second voltage clamping part 120, respectively.
The circuit input terminal 1001 of the circuit 100 is connected to the first input terminal 1101 of the first voltage-clamping unit 110, the first output terminal 1102 of the first voltage-clamping unit 110 is connected to the second input terminal 1201 of the second voltage-clamping unit 120, and the second output terminal 1202 of the second voltage-clamping unit 120 is connected to the circuit output terminal 1002 of the circuit 100.
The input end 1001 of the circuit is the positive end of the circuit power supply of the circuit 100 under the normal operating voltage, and the output end 1002 of the circuit is the negative end of the circuit power supply under the normal operating voltage.
The first voltage clamping portion 110 includes a unidirectional TVS.
Preferably, the first clamping part 110 includes: a unidirectional TVS, and other circuit elements connected in series with the unidirectional TVS without affecting its operating characteristics.
The second voltage clamping portion 120 includes a unidirectional TVS.
Preferably, the second pressure clamping portion includes: a unidirectional TVS; and other circuit elements connected in series with the unidirectional TVS without affecting its operating characteristics.
According to an embodiment of the present invention, the first voltage clamping section 110 comprises a first unidirectional TVS, and the second voltage clamping section 120 comprises a second unidirectional TVS, wherein a first input 1101 of the first unidirectional TVS is connected to a circuit input 1001 of the circuit 100, a first output 1102 of the first unidirectional TVS is connected to a second input 1201 of the second unidirectional TVS, and a second output 1202 of the second unidirectional TVS is connected to a circuit output 1002 of the circuit 100.
In this embodiment, the anode of the first unidirectional TVS corresponds to the first input 1101, the cathode corresponds to the first output 1102, the cathode of the second unidirectional TVS corresponds to the second input 1201, and the anode corresponds to the second output 1202.
With continued reference to fig. 1, a circuit 100 according to the present invention may be coupled to a working circuit 200 to protect the working circuit 200 in the event of the aforementioned harsh waveform.
The input portion of the working circuit 200 is connected to the second input end 1201 of the second voltage clamping portion 120, and the output portion of the working circuit 200 is connected to the second output end 1202 of the second voltage clamping portion 120.
The operating circuit 200 includes various electronic devices, such as an operating circuit in which an LED lamp is located. Preferably, the operating circuit 200 includes operating circuits corresponding to various in-vehicle electronic devices. Referring to fig. 2, fig. 2 illustrates a circuit schematic of a circuit according to an embodiment of the invention.
According to one implementation of the embodiment shown in fig. 2, the first voltage clamping portion 110 of the circuit 100 is a first unidirectional TVS D1, and the second voltage clamping portion 120 is a second unidirectional TVS D2, wherein the voltage clamping value of D1 is-100V and the voltage clamping value of D2 is-36V. The predetermined voltage-clamping value of the circuit 100 is-100V. The power supply resistance corresponding to the circuit 100 changes based on the change of the reverse voltage, wherein the power supply resistance is 300 ohms when the reverse voltage is about-600V, and the power supply resistance is 5 ohms when the reverse voltage is about-100 to-120V.
When the field-decaying pulse shown in fig. 6 is applied to both ends of the circuit 100, and the voltage suddenly drops from the normal operating voltage to the reverse voltage peak value of-600V, the second voltage-clamping portion D2 is turned on, the first voltage-clamping portion D1 clamps the voltage of the circuit 100 at-100V, and the pulse voltage is:
(600V-100V)/300Ω=1.67A；
the duration is about 0.5 to 1.5 milliseconds.
Subsequently, when the reverse voltage of the field damping pulse is less than-100V, the first voltage clamping part D1 is turned off, so that the circuit 100 is entirely turned off.
It should be understood by those skilled in the art that, based on the solution of the embodiment, by using the unidirectional TVS as the first voltage clamping portion, a large reverse voltage peak can be effectively clamped, and the circuit is directly cut off at about-100V, so that the circuit 100 is entirely disconnected, and thus, the working circuit 200 connected in parallel with the second voltage clamping portion is not affected by the instantaneous reverse voltage, thereby effectively protecting the vehicle-mounted electronic device.
As a preferable solution, the circuit 100 according to this embodiment may further include an auxiliary portion 130 in addition to the first voltage clamping portion 110 and the second voltage clamping portion 120.
The auxiliary portion 130 is used for providing an auxiliary protection function. Preferably, the auxiliary part 130 may include other input protection circuits than protection against bad waveform pulses.
More preferably, the auxiliary portion 130 has at least any one of the following functions:
1) an electrostatic breakdown protection function;
2) leakage current leakage protection function.
Wherein the auxiliary portion 130 comprises elements having a corresponding shielding function. Preferably, the auxiliary portion includes:
1) at least one element capable of providing electrostatic breakdown protection (ESD); for example, capacitance, etc.;
2) at least one element capable of providing leakage current leakage protection; such as resistance, etc.
Preferably, the auxiliary part 130 may further include a combination circuit of a plurality of the above elements. For example, a series and/or parallel circuit of a plurality of capacitors, a series and/or parallel circuit of a plurality of resistors, a series/parallel circuit of a plurality of capacitors and a plurality of resistors, or the like.
Moreover, as will be readily understood by those skilled in the art, the auxiliary portion includes, but is not limited to, the above-mentioned components capable of performing the protection function, and may also include other circuit electrical components, such as a switch, a diode, a transistor, and the like.
More preferably, the auxiliary part 130 may include a first sub-auxiliary part 1301 and/or a second sub-auxiliary part 1302. The first sub-auxiliary unit 1301 is used to provide auxiliary protection for the entire circuit 100. The second sub auxiliary portion 1302 is used for providing auxiliary protection for the second clamping portion.
The input terminal of the first sub-auxiliary unit 1301 is connected to the circuit input terminal 1001, and the output terminal of the first sub-auxiliary unit 1301 is connected to the circuit output terminal 1002.
The input terminal of the second sub-auxiliary portion 1302 is connected to the second input terminal 1201 of the second voltage clamping portion 120, and the output terminal thereof is connected to the second output terminal 1201 of the second voltage clamping portion 120.
Referring to fig. 3, the first voltage clamping portion 110 includes a unidirectional TVS D1, the second voltage clamping portion 120 includes a unidirectional TVSD2, and the auxiliary portion 130 includes a first sub-auxiliary portion 1301 and a second sub-auxiliary portion 1302, wherein the first sub-auxiliary portion 1301 includes a capacitor C1 and a resistor R1 connected in parallel, and the second sub-auxiliary portion 1302 includes two capacitors C2 and C3 connected in parallel.
The capacitor C1 is used for performing electrostatic discharge protection (ESD protection) on the whole circuit 100, the capacitors C2 and C3 are used for performing BCI test protection on the subsequent operating circuit 200, and the resistor R1 is used for discharging leakage current.
As will be readily understood by those skilled in the art, by including the auxiliary portion 130, ESD protection for the circuit 100 or the second voltage clamping portion 120 can be effectively achieved, or leakage current can be discharged, so as to more effectively protect each element in the circuit 100. Moreover, the BCI test protection can be more effectively carried out on the working circuit 200 part through the protection capacitors C2 and C3.
As a further preferred option, the circuit 100 according to the invention may further comprise a further protection portion 140. The other protection portion 140 is connected in parallel with the second voltage clamping portion 120 and is turned on when the voltage is reversed.
Wherein the other protection part 140 includes at least one input protection circuit for processing a bad waveform in addition to the aforementioned characteristics.
Preferably, the other Protection part 140 is a Load Dump Protection (Load Dump Protection) circuit. More preferably, the load dump protection circuit may be implemented based on NMOS or PMOS elements.
The circuit 100 according to the preferred embodiment is loaded with a field-decaying pulse or a pulse of similar waveform as shown in fig. 6.
In the reverse voltage phase, the other protection part 140 and the second voltage clamping part 120 are both in the conducting state. Therefore, during the reverse voltage peak period, such as-600V, the reverse voltage is still clamped at the predetermined clamped value, such as-100V, by D1, and in case the reverse voltage drops below the predetermined clamped value, D1 is turned off, thereby turning off the whole circuit 100.
During the forward voltage application period, D1 is always on, and when the forward voltage is greater than the clamped value of D2, D2 clamps itself at its clamped value. Thereby preventing the operating circuit 200 from being subjected to an excessively high voltage. When the forward voltage is smaller than the clamped value of D2, D2 is turned off, and the other protection units 140 assume the protection function of the working circuit 200. I.e. such as a load dump pulse, etc.
Specifically, refer to fig. 4 and 5.
Fig. 4 illustrates a circuit 100 according to yet another embodiment of the invention. The circuit 100 according to the embodiment shown in fig. 4 includes a first voltage clamping portion 110, a second voltage clamping portion 120, a first sub-auxiliary portion 1301, a second sub-auxiliary portion 1302, and an additional protection portion 140.
The first voltage clamping portion 110 includes a unidirectional TVS D1, the second voltage clamping portion 120 includes a unidirectional TVS D2 opposite to the unidirectional TVS D1, the first sub-auxiliary portion includes a capacitor C1, the second sub-auxiliary portion includes a resistor R6, and the other protection portions 140 are an NMOS-based load dump protection circuit.
Specifically, the other protection unit 140 includes an NMOS Q1, a transistor Q2, a diode D3, zener diodes D4, D5, capacitors C2 to C5, and resistors R1 to R5.
Wherein, those skilled in the art can understand the functions of the foregoing elements in the load dump test, for example, Q1, Q2 are used for turning off the circuit, D3 is used for reverse voltage protection, C5 and R5 are used for prolonging the circuit turn-off time, D5 is a protection diode of NMOS, etc.
With continued reference to fig. 5, fig. 5 illustrates a circuit 100 according to yet another embodiment of the present invention.
The circuit 100 according to the embodiment shown in fig. 5 includes a first voltage clamping portion 110, a second voltage clamping portion 120, an auxiliary portion 130 and another protection portion 140.
The first voltage clamping portion 110 includes a unidirectional TVS D1, the second voltage clamping portion 120 includes a unidirectional TVS D2 opposite to the unidirectional TVS D1, the auxiliary portion 130 includes a capacitor C1 and a resistor R1, and the other protection portion 140 is a PMOS-based load dump protection circuit.
Specifically, the other protection unit 140 includes transistors Q1 and Q3, a PMOS Q2, zener diodes D3 and D4, capacitors C2 and C3, and resistors R2 to R4.
Wherein, those skilled in the art can understand the function of the foregoing elements in the load dump test, for example, Q1-Q3 is used to turn off the circuit, D3 is used to lower the voltage of Vbe _ Q1 to protect Q1, C3 and R5 are used to prolong the circuit turn-off time, D4 is a protection diode of PMOS, etc.
Based on the circuits shown in fig. 4 and 5, in the reverse voltage phase, the NMOS or PMOS of the other protection portion 140 is in the on state, and since the other protection portion 140 is entirely in the parallel state with the second voltage clamping portion 120, the other elements of the other protection portion 140 will not affect the operation mechanisms of D1 and D2.
In addition, those skilled in the art can adjust the load rejection circuit to increase, change or reduce the electrical components therein according to the actual situation and the requirement. Such changes do not affect the solution of the invention.
Compared with the prior art, the invention has the following advantages: according to the mode of the invention, the requirement on the voltage resistance of elements in the circuit is reduced, so that the cost of the whole circuit is reduced, and meanwhile, a better protection function for field attenuation voltage and transient reverse voltage with similar waveform such as shown in FIG. 6 can be still realized. The normal operation of the vehicle-mounted electronic equipment is ensured.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the system claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Wherein the abbreviations referred to herein are as follows.
Claims (13)
1. A circuit (100), the circuit (100) comprising:
a first voltage clamping portion (110); and
a second voltage clamping portion (120); wherein the first voltage clamping part (110) clamps a reverse voltage of the circuit (100); the second voltage clamping section (120) can clamp a forward voltage in the circuit (100).
2. The circuit (100) of claim 1, wherein the first clamping section (110) clamps the reverse voltage at a predetermined clamping value when the reverse voltage is greater than the predetermined clamping value corresponding to the circuit (100); when the reverse voltage is smaller than the predetermined voltage clamping value, the first voltage clamping part (110) is turned off to disconnect the circuit (100).
3. The circuit (100) of claim 1 or 2, wherein the circuit input (1001) of the circuit (100) is connected to the first input (1101) of the first voltage clamping section (110), the first output (1102) of the first voltage clamping section (110) is connected to the second input (1201) of the second voltage clamping section (120), and the second output (1202) of the second voltage clamping section (120) is connected to the circuit output (1002) of the circuit (100).
4. The circuit (100) of any of claims 1-3, wherein the first voltage clamping section (110) comprises a first unidirectional TVS and the second voltage clamping section (120) comprises a second unidirectional TVS, wherein a first input (1101) of the first unidirectional TVS is connected to a circuit input (1001) of the circuit (100), a first output (1102) of the first unidirectional TVS is connected to a second input (1201) of the second unidirectional TVS, and a second output (1202) of the second unidirectional TVS is connected to a circuit output (1002) of the circuit (100).
5. The circuit (100) according to any of claims 1-4, wherein the circuit (100) further comprises an auxiliary portion (130) for assisting in protecting the circuit (100).
6. The circuit (100) of any of claims 1 to 5, wherein the circuit (100) further comprises a further protection section (140), one end of the further protection section (140) being connected to the first output terminal (1102) of the first voltage clamping section (110) and the second input terminal (1201) of the second voltage clamping section (120), the other end of the further protection section (140) being connected to the second output terminal (1202) of the second voltage clamping section (120).
7. The circuit (100) of claim 6, wherein the other protection portion (140) comprises a load dump protection circuit.
8. The circuit (100) of claim 7, wherein the load dump protection circuit is implemented based on NMOS or PMOS.
9. The circuit (100) of any of claims 1 to 8, wherein the circuit (100) is connectable to an operating circuit (200), wherein an input of the operating circuit (200) is connected to the second input (1201) of the second clamping section (120) and an output of the operating circuit (200) is connected to the second output (1202) of the second clamping section (120).
10. A method of operating a circuit (100), wherein the circuit (100) is as claimed in any one of claims 1 to 9, wherein the method comprises the steps of:
-applying a reverse voltage to the circuit (100), the second voltage clamping section (120) being conductive when the reverse voltage is larger than the predetermined voltage value, the first voltage clamping section (110) clamping the reverse voltage at a predetermined voltage value; when the reverse voltage is smaller than the predetermined voltage clamping value, the first voltage clamping part (110) is turned off to disconnect the circuit (100).
11. The method of claim 10, wherein the method further comprises the steps of:
-applying a forward voltage to the circuit (100), wherein the first voltage clamping section (110) is conducting and the second voltage clamping section (120) clamps the forward voltage when the forward voltage is larger than a voltage clamping value of the second voltage clamping section (120).
12. A vehicle lamp comprising the circuit (100) according to any one of claims 1 to 9.
13. A vehicle comprising the lamp of claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811041764.XA CN110890741A (en) | 2018-09-07 | 2018-09-07 | Circuit, operation method thereof, corresponding car lamp and car |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811041764.XA CN110890741A (en) | 2018-09-07 | 2018-09-07 | Circuit, operation method thereof, corresponding car lamp and car |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE825225A (en) * | 1974-02-06 | 1975-05-29 | CIRCUIT FOR BLOCKING AND DECLINE A TRAIN OF ELECTRIC PULSES | |
| US5751525A (en) * | 1996-01-05 | 1998-05-12 | Analog Devices, Inc. | EOS/ESD Protection circuit for an integrated circuit with operating/test voltages exceeding power supply rail voltages |
| US20050254274A1 (en) * | 2004-05-14 | 2005-11-17 | Grand Power Sources Inc. | Power supply device for out putting stable programmable power supply |
| US20090141414A1 (en) * | 2007-11-30 | 2009-06-04 | Chin Wei Hsu | Protection circuit for electric power of a car |
| CN101499640A (en) * | 2008-02-01 | 2009-08-05 | 研华股份有限公司 | DC electric power protection apparatus and operation method thereof |
| TW200939593A (en) * | 2008-03-11 | 2009-09-16 | Mitac Technology Corp | Car charger and surge protection device thereof |
| US20100026253A1 (en) * | 2008-07-30 | 2010-02-04 | Shih-Yuan Wang | Buck converter with surge protection |
| CN202206134U (en) * | 2011-08-16 | 2012-04-25 | 江苏晟芯微电子有限公司 | Light emitting diode (LED) over-voltage and open-circuit protection device |
| DE202016106181U1 (en) * | 2016-11-04 | 2016-11-18 | Guangdong Oml Technology Co., Ltd. | LED light strip circuit |
| CN107147097A (en) * | 2017-06-22 | 2017-09-08 | 武汉元丰汽车电控系统有限公司 | A kind of protection circuit |
| CN206712658U (en) * | 2017-03-28 | 2017-12-05 | 株式会社村田制作所 | A kind of clamp circuit and voltage changer |
| WO2018076714A1 (en) * | 2016-10-31 | 2018-05-03 | 华为技术有限公司 | Interface protection circuit |
-
2018
- 2018-09-07 CN CN201811041764.XA patent/CN110890741A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE825225A (en) * | 1974-02-06 | 1975-05-29 | CIRCUIT FOR BLOCKING AND DECLINE A TRAIN OF ELECTRIC PULSES | |
| US5751525A (en) * | 1996-01-05 | 1998-05-12 | Analog Devices, Inc. | EOS/ESD Protection circuit for an integrated circuit with operating/test voltages exceeding power supply rail voltages |
| US20050254274A1 (en) * | 2004-05-14 | 2005-11-17 | Grand Power Sources Inc. | Power supply device for out putting stable programmable power supply |
| US20090141414A1 (en) * | 2007-11-30 | 2009-06-04 | Chin Wei Hsu | Protection circuit for electric power of a car |
| CN101499640A (en) * | 2008-02-01 | 2009-08-05 | 研华股份有限公司 | DC electric power protection apparatus and operation method thereof |
| US20090231772A1 (en) * | 2008-03-11 | 2009-09-17 | Mitac Techonology Corp. | Car charger and surge protection device thereof |
| TW200939593A (en) * | 2008-03-11 | 2009-09-16 | Mitac Technology Corp | Car charger and surge protection device thereof |
| US20100026253A1 (en) * | 2008-07-30 | 2010-02-04 | Shih-Yuan Wang | Buck converter with surge protection |
| CN202206134U (en) * | 2011-08-16 | 2012-04-25 | 江苏晟芯微电子有限公司 | Light emitting diode (LED) over-voltage and open-circuit protection device |
| WO2018076714A1 (en) * | 2016-10-31 | 2018-05-03 | 华为技术有限公司 | Interface protection circuit |
| DE202016106181U1 (en) * | 2016-11-04 | 2016-11-18 | Guangdong Oml Technology Co., Ltd. | LED light strip circuit |
| CN206712658U (en) * | 2017-03-28 | 2017-12-05 | 株式会社村田制作所 | A kind of clamp circuit and voltage changer |
| CN107147097A (en) * | 2017-06-22 | 2017-09-08 | 武汉元丰汽车电控系统有限公司 | A kind of protection circuit |
Non-Patent Citations (2)
| Title |
|---|
| 曹汉房: "《脉冲与数字电路 第3版》", 29 February 2000, 北京航空航天大学出版社, pages: 241 - 243 * |
| 王雷等: "《单片机系统设计基础》", 北京航空航天大学出版社, pages: 207 - 210 * |
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