CN210899747U - Flow equalizing device and automobile lamp - Google Patents
Flow equalizing device and automobile lamp Download PDFInfo
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- CN210899747U CN210899747U CN201922010151.6U CN201922010151U CN210899747U CN 210899747 U CN210899747 U CN 210899747U CN 201922010151 U CN201922010151 U CN 201922010151U CN 210899747 U CN210899747 U CN 210899747U
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Abstract
The utility model relates to a flow straightener and car lamps and lanterns. A current share device for controlling current equality for multiple loads, the current share device comprising: the first regulating circuit is respectively used for connecting two loads to regulate the currents of the two loads to be the same; and at least one second regulating circuit which is respectively connected with the two first regulating circuits to regulate the currents of the two first regulating circuits to be the same, or is respectively connected with one first regulating circuit and one load to regulate the currents of the first regulating circuit and the load to be the same. The current equalizing device can output multiple paths of same current.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a flow straightener and car lamps and lanterns.
Background
In practical applications, it is often necessary to control the currents supplied to multiple loads to be the same. For example, in an automobile headlamp, in order to make the lamp design more flexible, an LED with a small size and stable performance is often used to meet the functional requirements of various high-profile lamps. The luminous flux of the LED depends on the driving current output to the LED, and in order to ensure that the brightness of each path of LED is the same, the current output to each path of LED needs to be the same. However, in the conventional circuit, there are errors in the driving current output to each load, and it cannot be guaranteed that multiple paths of the same current are output.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to provide a current sharing device and an automobile lamp for solving the problem that the driving current output to each load in the conventional circuit often has errors and cannot ensure that multiple paths of the same current are output.
A current share device for controlling current equality for multiple loads, the current share device comprising:
the first regulating circuit is respectively used for connecting two loads to regulate the currents of the two loads to be the same; and
and the at least one second regulating circuit is respectively connected with the two first regulating circuits to regulate the currents of the two first regulating circuits to be the same, or is respectively connected with one first regulating circuit and one load to regulate the currents of the first regulating circuit and the load to be the same.
The current equalizing device comprises at least one first adjusting circuit and at least one second adjusting circuit, wherein the first adjusting circuits are respectively connected with two loads to adjust the currents of the two loads to be the same, and the second adjusting circuits are respectively connected with the two first adjusting circuits to adjust the currents of the two first adjusting circuits to be the same, so that at least four paths of loads are controlled to be the same in current; or the second regulating circuit is connected with a first regulating circuit and a load to regulate the currents of the first regulating circuit and the load to be the same, so that at least three paths of loads are controlled to have the same current; namely, the current equalizing device can output multiple paths of same current.
In one embodiment, the method further comprises the following steps:
and the third regulating circuit is connected with the two second regulating circuits to regulate the currents of the two second regulating circuits to be the same, or is connected with one second regulating circuit and one load to regulate the currents of the second regulating circuit and the load to be the same.
In one embodiment, the first adjusting circuit, the second adjusting circuit and the third adjusting circuit each include a current collecting unit, a current monitoring unit and a current adjusting unit which are connected in sequence;
the current collecting unit in the first regulating circuit is used for collecting current signals of two loads and respectively converting the current signals into a first voltage signal and a second voltage signal, and the current monitoring unit in the first regulating circuit is used for controlling the current regulating unit to regulate the first voltage signal and the second voltage signal to be the same in size when the first voltage signal and the second voltage signal are different;
the current collecting unit in the second regulating circuit is used for collecting current signals of the two first regulating circuits, or collecting the current signals of the first regulating circuits and the current signals of the load, and respectively converting the current signals into a third voltage signal and a fourth voltage signal;
the current acquisition unit is used for gathering two among the third regulating circuit the current signal of second regulating circuit, perhaps gathers the current signal of second regulating circuit with the current signal of load to convert fifth voltage signal and sixth voltage signal, current monitoring unit is used for in the third regulating circuit fifth voltage signal with sixth voltage signal is not simultaneously control the current adjustment unit adjusts fifth voltage signal with sixth voltage signal size is the same.
In one embodiment, the current regulating unit comprises a first switching tube and a second switching tube, the current monitoring unit comprises a first operational amplifier and a second operational amplifier, and the current collecting unit comprises a first collecting unit and a second collecting unit;
the first end of the first switch tube is connected with the output end of the first operational amplifier, the second end of the first switch tube is connected with one of the load, the first regulating circuit, the second regulating circuit and the third regulating circuit, the third end of the first switch tube is connected with the first acquisition unit and is connected with the reverse input end of the first operational amplifier, and the third end of the first switch tube is also connected with the same-direction input end of the second operational amplifier;
a first end of the second switching tube is connected with an output end of the second operational amplifier, a second end of the second switching tube is connected with one of the load, the first regulating circuit, the second regulating circuit and the third regulating circuit, a third end of the second switching tube is connected with the second acquisition unit and is connected with a reverse input end of the second operational amplifier, and a third end of the second switching tube is also connected with a same-direction input end of the first operational amplifier;
the first ends of the first switch tube and the second switch tube are grids, the second ends of the first switch tube and the second switch tube are drains, and the third ends of the first switch tube and the second switch tube are source electrodes.
In one embodiment, the first switch tube and the second switch tube are both field effect transistors.
In one embodiment, the first adjusting circuit, the second adjusting circuit, and the third adjusting circuit further include current limiting resistors disposed at the same-direction input end, the reverse-direction input end, and the output end of the first operational amplifier and the second operational amplifier, and the first end of the first switch tube and the first end of the second switch tube.
In one embodiment, the current collecting unit is a resistor.
In one embodiment, the voltage regulator further comprises a plurality of voltage regulation units, and each voltage regulation unit is connected with one of the first regulation circuit, the second regulation circuit and the third regulation circuit.
In one embodiment, the load is an LED lamp.
An automobile lamp comprises a lamp body and the current equalizing device.
Drawings
Fig. 1a is a block diagram of a current sharing device in a first embodiment.
Fig. 1b is a block diagram of a current sharing device in a second embodiment.
Fig. 2a is a block diagram of a current sharing device in a third embodiment.
Fig. 2b is a block diagram of a current sharing device in a fourth embodiment.
Fig. 2c is a block diagram of a current share device in a fifth embodiment.
FIG. 3a is a block diagram of a current share device in a sixth embodiment.
FIG. 3b is a block diagram of a current share device in a seventh embodiment.
FIG. 4 is a circuit diagram of a current share device according to an embodiment.
Fig. 5 is a simulation diagram of controlling 4 load currents by a current sharing device in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The current-sharing device is provided aiming at the problems that the traditional circuit always has errors in the driving current output to each load and cannot guarantee the output of multiple paths of same current. The current equalizing device can control the current of at least three paths of loads to be the same, one of the paths of loads can be disconnected, and other loads are completely disconnected. The load may be an LED lamp used in an automobile lamp, or may be other devices. When the load is an LED lamp, the cathode of the LED lamp is connected with the current equalizing device. When the load is an LED lamp, the number of LEDs connected in series in each path does not need to be equal, and even if the number of LEDs in each path is different, the current equalizing device can still enable the current of the LEDs in each path to be the same. The application also provides an automobile lamp, which comprises the flow equalizing device and the lamp body, and the flow equalizing device can control the current of each LED to be the same, so that the luminous intensity of each LED in the automobile lamp is the same, and the functional requirements of various high-voltage distribution lamps are met. The flow equalizers are described in detail below.
The current-sharing device comprises at least one first regulating circuit and at least one second regulating circuit. The first adjusting circuit is respectively used for connecting two loads to adjust the currents of the two loads to be the same; the second regulating circuit is respectively connected with the two first regulating circuits to regulate the currents of the two first regulating circuits to be the same, or is respectively connected with one first regulating circuit and one load to regulate the currents of the first regulating circuit and the load to be the same.
Specifically, fig. 1a is a block diagram of a current sharing device in a first embodiment. As shown in fig. 1a, the current sharing device 120 includes two first regulating circuits 121 and one second regulating circuit 122. The two first adjusting circuits 121 are respectively connected to two loads 110 and adjust the currents of the two loads 110 connected thereto to be the same, that is, the adjusting currents I111 and I112 are respectively equal, and the adjusting currents I121 and I122 are respectively equal. The second adjusting circuit 122 is connected to the two first adjusting circuits 121 to adjust the currents I110 and I120 of the two first adjusting circuits 121 to be equal, so that the currents I111, I112, I121, and I122 of the four loads are equal.
Fig. 1b is a block diagram of a current sharing device in a second embodiment. As shown in fig. 1b, the current sharing device 120 includes a first regulating circuit 121 and a second regulating circuit 122. The first adjusting circuit 121 is connected to two loads 110 and adjusts the currents of the two loads 110 connected thereto to be the same, i.e., adjusts the current I131 to be equal to the current I132, respectively. The second regulating circuit 122 is connected to a first regulating circuit 121 and a load 110 to regulate the current I130 of the first regulating circuit 121 to be equal to the current I140 of the load 110, so that the currents I131, I132 and I141 of the three loads are equal.
In other embodiments, the number of the first regulating circuit 121 and the second regulating circuit 122 in the current sharing device 120 may be set according to needs, and it is also possible to control the currents of the five-way load and the six-way load … … to be equal, which is not illustrated here.
The current sharing device comprises at least one first regulating circuit 121 and at least one second regulating circuit 122, wherein the first regulating circuit 121 is respectively connected with the two loads 110 to regulate the currents of the two loads 110 to be the same, and the second regulating circuit 122 is respectively connected with the two first regulating circuits 121 to regulate the currents of the two first regulating circuits 121 to be the same, so that at least four loads 110 are controlled to be the same in current; or the second regulating circuit 122 is connected with a first regulating circuit 121 and a load 110 to regulate the currents of the first regulating circuit 121 and the load 110 to be the same, so as to control the currents of at least three loads 110 to be the same; that is, the current equalizing device 120 can output multiple paths of the same current.
Further, the current sharing device 120 further includes a third adjusting circuit. As shown in fig. 2a to 2c, the third adjusting circuit 123 is connected to the two second adjusting circuits 122 to adjust the currents of the two second adjusting circuits 122 to be the same; alternatively, as shown in fig. 3a to 3b, the third regulating circuit 123 is connected to a second regulating circuit 122 and a load 110 to regulate the currents of the second regulating circuit 122 and the load 110 to be the same.
Fig. 2a is a block diagram of a current sharing device in a third embodiment. As shown in fig. 2a, two first adjusting circuits 121 are connected to the second adjusting circuit 122 in this embodiment, so that the two second adjusting circuits 122 respectively adjust the currents I211 and I212 of the two first adjusting circuits to be equal, and adjust the currents I221 and I222 of the two first adjusting circuits to be equal, where the first adjusting circuit 121 respectively adjusts the currents I2111 and I2112 of the two loads 110 to be equal, adjusts the currents I2121 and I2122 of the two loads 110 to be equal, adjusts the currents I2211 and I2212 of the two loads 110 to be equal, and adjusts the currents I2221 and I2222 of the two loads 110 to be equal. Since the third adjusting circuit 123 adjusts the currents I210 and I220 of the two second adjusting circuits 122 to be equal, the current sharing device 120 in this embodiment can control the currents I2111, I2112, I2121, I2122, I2211, I2212, I2221, and I2222 of the eight loads to be equal.
Fig. 2b is a block diagram of a current sharing device in a fourth embodiment. As shown in fig. 2b, the second regulating circuit 122 in this embodiment is connected to a first regulating circuit 121 and a load 110, so that the two second regulating circuits 122 respectively regulate the current I231 of the first regulating circuit and the current I232 of the load 110 to be equal, and regulate the current I241 of the first regulating circuit and the current I242 of the load 110 to be equal, wherein the first regulating circuit 121 respectively regulates the current I2311 and the current I2312 of the two loads 110 to be equal, and regulates the current I2411 and the current I2412 of the two loads 110 to be equal. Since the third adjusting circuit 123 adjusts the currents I230 and I240 of the two second adjusting circuits 122 to be equal, the current sharing device 120 in this embodiment can control the currents I2311, I2312, I232, I2411, I2412, and I242 of the six loads to be equal.
Fig. 2c is a block diagram of a current share device in a fifth embodiment. As shown in fig. 2c, two first adjusting circuits 121 are connected to one of the second adjusting circuits 122 in the present embodiment, and adjust the current I251 and the current I252 of the two first adjusting circuits to be equal; a first regulating circuit 121 and a load 110 are connected to the further second regulating circuit 122, so that the current I261 of the first regulating circuit and the current I262 of the load 110 are regulated to be equal; the three first adjusting circuits 121 respectively adjust the current I2511 and the current I2512 of the two loads 110 to be equal, adjust the current I2521 and the current I2522 of the two loads 110 to be equal, and adjust the current I2611 and the current I2612 of the two loads 110 to be equal. Since the third adjusting circuit 123 adjusts the currents I250 and I260 of the two second adjusting circuits 122 to be equal, the current sharing device 120 in this embodiment can control the currents I2511, I2512, I2521, I2522, I2611, I2612 and I262 of the seven loads to be equal.
FIG. 3a is a block diagram of a current share device in a sixth embodiment. As shown in fig. 3a, the present embodiment includes two first adjusting circuits 121, one second adjusting circuit 122, and one third adjusting circuit 123. The two first adjusting circuits 121 are respectively connected with two loads, the current I3111 and the current I3112 of the two loads are adjusted to be equal, and the current I3121 and the current I3122 of the two loads are adjusted to be equal; the second regulating circuit 122 regulates the currents I311 and I312 of the two first regulating circuits to be equal; since the third adjusting circuit 123 adjusts the current I310 of the second adjusting circuit 122 to be equal to the current I320 of one load 110; therefore, the current sharing device 120 in this embodiment can adjust the currents I3111, I3112, I3121, I3122, and I320 of the five loads to be equal.
FIG. 3b is a block diagram of a current share device in a seventh embodiment. As shown in fig. 3b, the present embodiment includes a first adjusting circuit 121, a second adjusting circuit 122 and a third adjusting circuit 123. The first adjusting circuit 121 is connected to two loads 110, and adjusts the current I3311 and the current I3312 of the two loads 110 to be equal; the second regulating circuit 122 regulates the current I331 of the first regulating circuit and the current I332 of the load 110 to be equal; since the third regulating circuit 123 regulates the current I330 of the second regulating circuit 122 to be equal to the current I340 of one load 110; therefore, the current sharing device 120 in this embodiment can adjust the currents I3111, I3112, I3121, I3122, and I320 of the four loads to be equal.
The embodiments described above are merely exemplary embodiments of the current share 120 of the present application. In other embodiments, the number of the first adjusting circuit 121, the second adjusting circuit 122, and the third adjusting circuit 123 in the current sharing device 120 may be increased or decreased as needed, so that the current sharing device 120 can control the currents of at least three loads 110 to be equal.
In a specific embodiment, the first adjusting circuit 121, the second adjusting circuit 122, and the third adjusting circuit 123 each include a current collecting unit, a current monitoring unit, and a current adjusting unit, which are connected in sequence.
The current collecting unit in the first adjusting circuit 121 is configured to collect current signals of two loads and convert the current signals into a first voltage signal and a second voltage signal respectively; the current monitoring unit in the first adjusting circuit 121 controls the current adjusting unit to adjust the first voltage signal and the second voltage signal to be the same in magnitude when the first voltage signal and the second voltage signal are different.
The current collecting unit in the second adjusting circuit 122 is configured to collect current signals of the two first adjusting circuits, or collect current signals of the first adjusting circuits and current signals of the load, and respectively convert the current signals into a third voltage signal and a fourth voltage signal; the current monitoring unit in the second adjusting circuit 122 is used for controlling the current adjusting unit to adjust the third voltage signal and the fourth voltage signal to be the same in magnitude when the third voltage signal and the fourth voltage signal are different.
The current collecting unit in the third adjusting circuit 123 is configured to collect current signals of the two second adjusting circuits, or collect current signals of the second adjusting circuits and current signals of the load, and convert the current signals into a fifth voltage signal and a sixth voltage signal; the current monitoring unit in the third adjusting circuit 123 is configured to control the current adjusting unit to adjust the magnitude of the fifth voltage signal and the magnitude of the sixth voltage signal to be the same when the fifth voltage signal and the sixth voltage signal are different.
In this embodiment, the current adjusting unit includes a first switch tube and a second switch tube; the current monitoring unit comprises a first operational amplifier and a second operational amplifier; the current acquisition unit comprises a first acquisition unit and a second acquisition unit.
The first end of the first switch tube is connected with the output end of the first operational amplifier, the second end of the first switch tube is connected with one of the load, the first adjusting circuit, the second adjusting circuit and the third adjusting circuit, the third end of the first switch tube is connected with the first acquisition unit and is connected with the reverse input end of the first operational amplifier, and the third end of the first switch tube is further connected with the same-direction input end of the second operational amplifier.
The first end of the second switch tube is connected with the output end of the second operational amplifier, the second end of the second switch tube is connected with one of the load, the first regulating circuit, the second regulating circuit and the third regulating circuit, the third end of the second switch tube is connected with the second acquisition unit and is connected with the reverse input end of the second operational amplifier, and the third end of the second switch tube is further connected with the same-direction input end of the first operational amplifier.
The first ends of the first switch tube and the second switch tube are grids, the second ends of the first switch tube and the second switch tube are drains, and the third ends of the first switch tube and the second switch tube are source electrodes.
Specifically, taking the first embodiment as an example, referring to fig. 1a to 1b, the current equalizing device 120 is used for adjusting the currents of the LED1, the LED2, the LED3, and the LED4 to be the same, so as to meet the functional requirement of the high-profile automobile lamp. To distinguish the first adjusting circuits connected to the LED1, the LED2, and the LED3, the LED4 in the present embodiment, they are respectively denoted as a first adjusting circuit 121A and a first adjusting circuit 121B.
In the first adjustment circuit 121A, the first current collecting unit is a resistor R11, the second current collecting unit is a resistor R12, and the resistance values of the resistor R11 and the resistor R12 are equal. The first switch tube is a field effect tube U11, and the second switch tube is a field effect tube U12. The first operational amplifier is operational amplifier U13A and the second operational amplifier is operational amplifier U13B. The resistor R13, the resistor R14, the resistor R15, the resistor R16, the resistor R17, the resistor R18, the resistor R19, the resistor R110, the resistor R111 and the resistor R112 are all current-limiting resistors.
The grid of the field-effect tube U11 is connected with the output end of the operational amplifier U13A, the drain of the field-effect tube U11 is connected with the LED1, and the source of the field-effect tube U11 is connected with the resistor R11, the reverse input end of the operational amplifier U13A and the same-direction input end of the operational amplifier U13B.
The gate of the field-effect tube U12 is connected with the output end of the operational amplifier U13B, the drain of the field-effect tube U12 is connected with the LED2, and the source of the field-effect tube U12 is connected with the resistor R12, the inverting input end of the operational amplifier U13B and the inverting input end of the operational amplifier U13A.
When the first regulating circuit 121A is normally operated, the source and the drain of the fet U11 are normally connected, and the source and the drain of the fet U12 are also normally connected. The resistor R11 converts the output current signal I111 of the LED1 into a first voltage signal V1, and outputs the first voltage signal to the inverting input terminal of the operational amplifier U13A. The resistor R12 converts the output current signal I112 of the LED2 into a voltage signal V2, and outputs the voltage signal to the inverting input terminal of the operational amplifier U13B.
Since the inverting input terminal of the operational amplifier U13A is connected to the source of the fet U12, i.e., to the resistor R12, the second voltage signal V2 collected by the resistor R12 is also output to the inverting input terminal of the operational amplifier U13A, and similarly, the first voltage signal V1 is also output to the inverting input terminal of the operational amplifier U13B.
When the first voltage signal V1 is greater than the second voltage signal V2, that is, the source voltage of the fet U11 is greater than the source voltage of the fet U12, and neither of the branches where the LED1 and the LED2 are open, the output voltage of the operational amplifier U13A is reduced because the voltage of the inverting input terminal is greater than the voltage of the non-inverting input terminal, the gate voltage of the fet U11 is reduced, the voltage drop of the fet U11 is increased, and the first voltage signal V1 output by the resistor R11 is reduced until the first voltage signal V1 is equal to the second voltage signal V2. That is, the operational amplifier U23A and the operational amplifier U23B control the fet U11 and/or the fet U12 to adjust so that the first voltage signal V1 is the same as the second voltage signal V2 when the first voltage signal V1 is different from the second voltage signal V2. Since the resistance values of the resistor R11 and the resistor R12 are equal, the current flowing through the branch where the resistor R11 is located is equal to the current flowing through the branch where the resistor R12 is located, that is, the current of the LED1 is equal to the current of the LED2, so that the first adjusting circuit 121A achieves the purpose of adjusting the two load currents to be equal.
When the second voltage signal V2 is 0, that is, the LED2 is open, the voltage at the input end of the operational amplifier U13A in the same direction is 0, so that the voltage at the output end of the operational amplifier U13A is 0, the voltage at the gate of the fet U11 is 0, and the fet U11 is turned off, so that the LED1 is open, that is, the LED2 is open, so that the LED1 is also open.
Similar to the above case, when the first voltage signal V1 is smaller than the second voltage signal V2, that is, the source voltage of the fet U11 is smaller than the source voltage of the fet U12, and neither the branch where the LEDs 1 and 2 are located is open, and the first voltage signal V1 is 0, that is, the LED1 is open, the description is omitted here.
The first adjustment circuit 121B has the same circuit configuration as the first adjustment circuit 121A. The resistor R21 is a first acquisition unit, the resistor R22 is a second acquisition unit, and the resistance values of the resistor R22 and the resistor R21 are equal; the resistor R23, the resistor R24, the resistor R25, the resistor R26, the resistor R27, the resistor R28, the resistor R29, the resistor R210, the resistor R211 and the resistor R212 are all current-limiting resistors; the operational amplifier U23A is a first operational amplifier, and the operational amplifier U23B is a second operational amplifier; the fet U21 is a first switch, and the fet U22 is a second switch. The control of LED3 and LED4 is similar to that of LED1 and LED 2.
Specifically, the resistor R21 collects the current of the LED3 and converts the current into a first voltage signal V3, and the resistor R22 collects the current of the LED4 and converts the current into a second voltage signal V4.
When the first voltage signal V3 is greater than the second voltage signal V4, and neither of the branches where the LED3 and the LED4 are located is open-circuited, the operational amplifier U23A decreases its output voltage due to the voltage of the inverting input terminal being greater than the voltage of the non-inverting input terminal, and the gate voltage of the fet U21 decreases, so that the voltage drop across the fet U21 increases, and the first voltage signal V3 output by the resistor R22 decreases until the first voltage signal V3 is equal to the second voltage signal V4. Since the resistors R21 and R22 have equal resistance values, the current flowing through the branch of the resistor R21 is equal to the current flowing through the branch of the resistor R22, i.e., the current of the LED3 is equal to the current of the LED 4.
When the second voltage signal V4 is 0, that is, the LED4 is open, the voltage at the input end of the operational amplifier U23A in the same direction is 0, so that the voltage at the output end of the operational amplifier U23A is 0, the voltage at the gate of the fet U21 is 0, and the fet U21 is turned off, so that the LED3 is open, that is, the LED4 is open, so that the LED3 is also open.
When the first voltage signal V3 is smaller than the second voltage signal V4, and neither of the branches where the LED3 and the LED4 are located is open, and the first voltage signal V3 is 0, i.e., the LED3 is open, the above situation is similar to the above situation, and details are not described here.
The second adjustment circuit 122 and the first adjustment circuit 121A have the same circuit configuration. The resistor R31 is a first collecting resistor, the resistor R32 is a second collecting resistor, and the resistance values of the resistor R31 and the resistor R32 are equal; the resistor R33, the resistor R34, the resistor R35, the resistor R36, the resistor R37, the resistor R38, the resistor R39, the resistor R310, the resistor R311 and the resistor R312 are all current-limiting resistors; operational amplifier U33A is a first operational amplifier and operational amplifier U33B is a second operational amplifier; the fet U31 is a first switch, and the fet U32 is a second switch. The second adjusting circuit 122 controls a process similar to that of the first adjusting circuit 121A described above.
Specifically, when the third voltage signal V5 is greater than the fourth voltage signal V6, and neither of the branches where the first regulating circuit 121A and the first regulating circuit 121B are located is open, the output voltage of the operational amplifier U33A decreases due to the fact that the voltage of the inverting input terminal is greater than the voltage of the non-inverting input terminal, the gate voltage of the fet U31 decreases, the voltage drop of the fet U31 increases, the third voltage signal V5 output by the resistor R31 decreases, and the third voltage signal V5 is equal to the fourth voltage signal V6. Since the resistances of the resistor R31 and the resistor R32 are equal, the current I110 flowing through the branch where the first adjusting circuit 121A is located is equal to the current I120 flowing through the branch where the second adjusting circuit 121B is located, so that the current I111 of the LED1, the current I112 of the LED2, the current I121 of the LED3, and the current I122 of the LED4 are equal.
When the fourth voltage signal V6 is 0, that is, the first regulating circuit 121B is open, the voltage at the input end in the same direction of the operational amplifier U33A is 0, so that the voltage at the output end of the operational amplifier U33A is 0, the voltage at the gate of the fet U31 is 0, and the fet U31 is closed, so that the first regulating circuit 121A is open, that is, the first regulating circuit 121B is open, and the first regulating circuit 121A is also open.
Similar to the above case, when the third voltage signal V5 is smaller than the fourth voltage signal V6, the branches where the first regulating circuit 121A and the first regulating circuit 121B are located are not open, and the third voltage signal V5 is 0, i.e., the first regulating circuit 121A is open, the description is omitted here.
It is understood that the second adjusting circuit 122 controls the first adjusting circuit 121A and the first adjusting circuit 121B to have the same current and open one of them, the first adjusting circuit 121A controls the LED1 and the LED2 to have the same current and open one of the LED1 and the LED2 to have the open other, the first adjusting circuit 121B controls the LED3 and the LED4 to have the same current and open one of the LED1 and the LED2 to have the open other, so that the currents of the LED1, the LED2, the LED3 and the LED4 are the same, and three of the LED1, the LED2, the LED3 and the LED4 are open.
In an embodiment, the current sharing device 120 may further include a plurality of voltage stabilizing units 129, and each voltage stabilizing unit 129 is connected to one of the first adjusting circuit 121, the second adjusting circuit 122, and the third adjusting circuit 123. The voltage stabilizing unit 129 can ensure to prevent the operational amplifier from being damaged by too high voltage.
Fig. 5 is a simulation diagram of controlling 4 load currents by a current sharing device in an embodiment. As shown in fig. 3 a-3 b, 4 paths of LED current are all 200mA within 0-1 s, and four paths of current sharing function are verified; at time 1s, optionally one LED is turned off, e.g. LED4 is turned off, so that I4After 1s, the current of the rest three paths of LEDs becomes very small and is close to 0 along with the disconnection of the field effect tube in the feedback loop, and the function of all-off is verified.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A current share device, wherein the current share device is used for controlling the current of multiple loads to be equal, the current share device comprises:
the first regulating circuit is respectively used for connecting two loads to regulate the currents of the two loads to be the same; and
and the at least one second regulating circuit is respectively connected with the two first regulating circuits to regulate the currents of the two first regulating circuits to be the same, or is respectively connected with one first regulating circuit and one load to regulate the currents of the first regulating circuit and the load to be the same.
2. The current share of claim 1, further comprising:
and the third regulating circuit is connected with the two second regulating circuits to regulate the currents of the two second regulating circuits to be the same, or is connected with one second regulating circuit and one load to regulate the currents of the second regulating circuit and the load to be the same.
3. The current sharing device according to claim 2, wherein the first adjusting circuit, the second adjusting circuit and the third adjusting circuit each comprise a current collecting unit, a current monitoring unit and a current adjusting unit, which are connected in sequence;
the current collecting unit in the first regulating circuit is used for collecting current signals of two loads and respectively converting the current signals into a first voltage signal and a second voltage signal, and the current monitoring unit in the first regulating circuit is used for controlling the current regulating unit to regulate the first voltage signal and the second voltage signal to be the same in size when the first voltage signal and the second voltage signal are different;
the current collecting unit in the second regulating circuit is used for collecting current signals of the two first regulating circuits, or collecting the current signals of the first regulating circuits and the current signals of the load, and respectively converting the current signals into a third voltage signal and a fourth voltage signal;
the current acquisition unit is used for gathering two among the third regulating circuit the current signal of second regulating circuit, perhaps gathers the current signal of second regulating circuit with the current signal of load to convert fifth voltage signal and sixth voltage signal, current monitoring unit is used for in the third regulating circuit fifth voltage signal with sixth voltage signal is not simultaneously control the current adjustment unit adjusts fifth voltage signal with sixth voltage signal size is the same.
4. The current sharing device according to claim 3, wherein the current adjusting unit comprises a first switch tube and a second switch tube, the current monitoring unit comprises a first operational amplifier and a second operational amplifier, and the current collecting unit comprises a first collecting unit and a second collecting unit;
the first end of the first switch tube is connected with the output end of the first operational amplifier, the second end of the first switch tube is connected with one of the load, the first regulating circuit, the second regulating circuit and the third regulating circuit, the third end of the first switch tube is connected with the first acquisition unit and is connected with the reverse input end of the first operational amplifier, and the third end of the first switch tube is also connected with the same-direction input end of the second operational amplifier;
a first end of the second switching tube is connected with an output end of the second operational amplifier, a second end of the second switching tube is connected with one of the load, the first regulating circuit, the second regulating circuit and the third regulating circuit, a third end of the second switching tube is connected with the second acquisition unit and is connected with a reverse input end of the second operational amplifier, and a third end of the second switching tube is also connected with a same-direction input end of the first operational amplifier;
the first ends of the first switch tube and the second switch tube are grids, the second ends of the first switch tube and the second switch tube are drains, and the third ends of the first switch tube and the second switch tube are source electrodes.
5. The current share of claim 4, wherein the first switch transistor and the second switch transistor are field effect transistors.
6. The current share device of claim 4, wherein the first, second, and third adjusting circuits each further comprise a current limiting resistor disposed at the inverting input, and the output of the first and second operational amplifiers, and at the first end of the first and second switching tubes.
7. The current share of claim 3, wherein the current collection unit is a resistor.
8. The current share device of claim 2, further comprising a plurality of voltage regulation units, each voltage regulation unit being connected to one of the first, second, and third regulation circuits.
9. The current share of claim 1, wherein the load is an LED light.
10. An automobile lamp, characterized by comprising a lamp body and the current sharing device as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922010151.6U CN210899747U (en) | 2019-11-19 | 2019-11-19 | Flow equalizing device and automobile lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922010151.6U CN210899747U (en) | 2019-11-19 | 2019-11-19 | Flow equalizing device and automobile lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210899747U true CN210899747U (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922010151.6U Active CN210899747U (en) | 2019-11-19 | 2019-11-19 | Flow equalizing device and automobile lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210899747U (en) |
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2019
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