CN110182151B - Potentiometer circuit with low quiescent current - Google Patents
Potentiometer circuit with low quiescent current Download PDFInfo
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- CN110182151B CN110182151B CN201910397701.6A CN201910397701A CN110182151B CN 110182151 B CN110182151 B CN 110182151B CN 201910397701 A CN201910397701 A CN 201910397701A CN 110182151 B CN110182151 B CN 110182151B
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- circuit
- potentiometer
- resistor
- power supply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
Abstract
The application relates to a potentiometer circuit with low quiescent current, wherein a switch circuit is arranged in the potentiometer circuit, and the on-off of the switch circuit is controlled by an ignition power supply. Thereby control the potentiometre to output control signal to the control unit, its intentional effect lies in: the static circuit of the potentiometer is zero under the flameout standby condition, so that the low static current of the automobile electronic product is effectively reduced, and meanwhile, the risk of silver migration of the silver potentiometer caused by the potentiometer is reduced; after the ignition of the vehicle is started, the potentiometer is conducted through the switch circuit, and a control signal is output to the control unit, so that the functions of the electronic product of the vehicle are awakened again, low quiescent current is realized at low cost, and the competitiveness of the product is improved.
Description
Technical Field
The application relates to the technical field of automotive electronics, in particular to a potentiometer circuit with low quiescent current.
Background
With the rise of electric automobiles, the requirements of automobile electronics on quiescent current are stricter at present, and for each automobile part, a lot of automobile factories require very low quiescent current. In an actual automobile electronic product, chips of part of components need to work under a standby condition, but standby quiescent current is required to be very low, such as 0.125 mA; in this case, if the product has a potentiometer, the potentiometer adopts a resistance voltage division structure, and the quiescent current consumed by the potentiometer is high, for example, in the case of 13.5V, the potentiometer divides the resistance 10K, and the quiescent current has 1.35mA, which cannot meet the product requirement of low quiescent current of the product.
Disclosure of Invention
In order to solve the above technical problem, the present application provides a low quiescent current potentiometer circuit, which at least includes:
a potentiometer circuit for outputting a control signal to the control unit;
the control unit comprises a control chip and is used for receiving and responding to a control signal from the potentiometer circuit;
the first power supply circuit comprises a power supply conversion chip; one end of the power conversion chip is connected with a battery power supply, and the other end of the power conversion chip is connected with the potentiometer circuit and the control unit and used for supplying power to the potentiometer circuit and the control unit;
one end of the second power supply circuit is connected with the ignition power supply, and the other end of the second power supply circuit is connected with the potentiometer circuit and used for controlling the on-off of the potentiometer circuit;
wherein the potentiometer circuit outputs a control signal to the control unit by receiving a potential signal from the second power supply circuit.
Optionally, the potentiometer circuit comprises at least:
the switch circuit is controlled by the second power supply circuit and is used for controlling the on-off of the potentiometer circuit;
the output circuit is used for receiving the potential signal from the switch circuit and outputting a control signal to the control unit;
and the voltage stabilizing circuit is connected between the power output end of the second power supply circuit and the switch circuit and is used for reducing voltage and stabilizing the circuit.
Optionally, the switching circuit includes a first triode and a second triode, a base of the first triode is connected with an output end of the voltage stabilizing circuit, a collector is connected with a base of the second triode, and an emitter is grounded; and the emitter of the second triode is connected with the first power output end of the first power circuit, and the collector of the second triode is connected with the output circuit.
Optionally, a first resistor is further connected between the collector of the first triode and the base of the second triode.
Optionally, a second resistor is further connected in parallel between the first resistor and the second triode, and the other end of the second resistor is connected with an emitter of the second triode.
Optionally, the output circuit comprises a potentiometer; and a first terminal of the potentiometer is connected with the second triode, a second terminal of the potentiometer is connected with a control signal input end of the control unit and outputs a control signal to the control unit, and a third terminal of the potentiometer is grounded.
Optionally, a third resistor and a first capacitor are further connected between the second terminal of the potentiometer and the control unit.
Optionally, the voltage stabilizing circuit includes a fourth resistor, a clamping diode, and a second capacitor connected in parallel.
Optionally, a first diode and a fifth resistor are sequentially connected between the second power supply circuit and the voltage stabilizing circuit.
Optionally, a sixth resistor and a seventh resistor are further connected between the voltage stabilizing circuit and the switch circuit.
According to the potentiometer circuit with low quiescent current, the switch circuit is arranged in the potentiometer circuit, and the on-off of the switch circuit is controlled by the ignition power supply. Thereby control the potentiometre to output control signal to the control unit, its intentional effect lies in: the static circuit of the potentiometer is zero under the flameout standby condition, so that the low static current of an automobile electronic product is effectively reduced, and meanwhile, the risk of silver migration of the silver potentiometer caused by the potentiometer is reduced; after the ignition of the vehicle is started, the potentiometer is conducted through the switch circuit, and a control signal is output to the control unit, so that the functions of the electronic product of the vehicle are awakened again, low quiescent current is realized at low cost, and the competitiveness of the product is improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present application;
FIG. 2 is a circuit diagram of an embodiment of the present application;
wherein, 1-control unit, 2-potentiometer circuit, 3-first power supply circuit, 4-second power supply circuit, 21-switch circuit, 22-output circuit, 23-voltage stabilizing circuit, VCC 1-first power supply input terminal, VCC 2-power supply output terminal of second power supply circuit, SW _ MCU-control signal input terminal, Q1-first triode, Q2-second triode, SW-potentiometer, SW 1-first terminal, SW 2-second terminal, SW 3-third terminal, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, R5-fifth resistor, R6-sixth resistor, R7-seventh resistor, C1-first capacitor, C2-second capacitor, D1-first diode, d2-clamp diode.
Detailed Description
The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will make the advantages and features of the present application more readily appreciated by those skilled in the art, and thus will more clearly define the scope of the invention.
In the embodiment shown in fig. 1, the present application provides a low quiescent current potentiometer circuit, which is intended to output no control signal to the control unit 1 when the vehicle is not sparking, and at least comprises:
a potentiometer circuit 2 for outputting a control signal to the control unit 1;
a control unit 1 including a control chip MCU for receiving and responding to a control signal from the capacitor circuit 2;
a first power supply circuit 3 including a power conversion chip; one end of the power conversion chip is connected with a battery power supply, and the other end of the power conversion chip is connected with the potentiometer circuit and the control unit 1 and used for supplying power to the potentiometer circuit and the control unit 1;
one end of the second power supply circuit 4 is connected with the ignition power supply, and the other end of the second power supply circuit is connected with the potentiometer circuit and used for controlling the on-off of the potentiometer circuit;
the potential device circuit outputs a control signal to the control unit 1 by receiving a potential signal from the second power supply circuit 4.
In the present embodiment, a switch circuit 21 is provided in the potentiometer circuit, and the switch circuit 21 is controlled to be turned on and off by the second power supply circuit 4, i.e., the ignition power supply. Therefore, the potentiometer is controlled to output a control signal to the control unit 1, a static circuit of the potentiometer is zero under the flameout standby condition, the low static current of an automobile electronic product is effectively reduced, and meanwhile, the risk of silver migration of the silver potentiometer caused by the potentiometer is reduced; after the vehicle is ignited and started, the potentiometer is conducted through the switch circuit 21, and a control signal is output to the control unit 1, so that the functions of the electronic product of the vehicle are awakened again, low static current is achieved at low cost, and the competitiveness of the product is improved.
In one embodiment, the potentiometer circuit comprises at least:
the switch circuit 21 is controlled by the second power supply circuit 4 and is used for controlling the on-off of the potentiometer circuit;
an output circuit 22 for receiving the potential signal from the switch circuit 21 and outputting a control signal to the control unit 1;
the voltage stabilizing circuit 23 is connected between the power output terminal VCC2 of the second power supply circuit 4 and the switch circuit 21, and is used for reducing the voltage and stabilizing the circuit.
In this embodiment, the potentiometer circuit at least comprises a switch circuit 21, an output circuit 22 and a voltage stabilizing circuit 23, the switch circuit 21 receives a potential signal from the second power circuit 4, and controls the first power circuit 3 to supply power to the output circuit 22, so as to control the output circuit 22 to output a control signal to the control unit 1, so as to enable a static circuit of the potentiometer to be zero under the condition of vehicle flameout and standby, effectively reduce the low static current of the automotive electronic product, and reduce the risk of silver migration of the silver potentiometer brought by the potentiometer; after the vehicle is ignited and started, the potentiometer is conducted through the switch circuit 21, and a control signal is output to the control unit 1, so that the functions of the automotive electronic product are awakened again, low static current is achieved at low cost, and the competitiveness of the product is improved.
In one embodiment, the switching circuit 21 includes a first transistor Q1 and a second transistor Q2, wherein a base of the first transistor Q1 is connected to the output terminal of the regulator circuit 23, a collector is connected to a base of the second transistor Q2, and an emitter is grounded; the emitter of the second transistor Q2 is connected to the first power output VCC1 of the first power circuit 3, and the collector is connected to the output circuit 22. A first resistor R1 is also connected between the collector of the first transistor Q1 and the base of the second transistor Q2. A second resistor R2 is also connected in parallel between the first resistor R1 and the second triode Q2, and the other end of the second resistor R2 is connected with an emitter of the second triode Q2.
In the present embodiment, the switch circuit 21 controls the on/off of the potentiometer circuit through the first transistor Q1 and the second transistor Q2, so that the first power circuit 3 is not conducted with the output circuit 22 under the vehicle flameout standby condition, and thus the output circuit does not output the control signal to the control unit 1; after the vehicle is ignited and started, the first power circuit 3 is conducted with the output circuit 22 through the switch circuit 21, so that the output circuit 22 outputs a control signal to the control unit 1, and the functions of the automotive electronic product are awakened again, so that low static current is realized at low cost, and the competitiveness of the product is improved.
In one embodiment, the output circuit 22 includes a potentiometer SW; the first terminal SW1 of the potentiometer SW is connected to the second transistor Q2, the second terminal SW2 is connected to the control signal input terminal SW _ MCU of the control unit 1 and outputs a control signal to the control unit 1, and the third terminal SW3 is grounded. A third resistor R3 and a first capacitor C1 are also connected between the second terminal SW2 of the potentiometer SW and the control unit 1.
In the present embodiment, the output circuit 22 outputs a control signal to the control unit 1 by receiving a potential signal from the first power supply circuit 3. The potentiometer is a resistance element with three leading-out ends and the resistance value can be adjusted according to a certain change rule. Potentiometers are generally composed of a resistive body and a movable brush. When the brush moves along the resistor, a resistance value or a voltage having a certain relation with the displacement is obtained at the output end. In this embodiment, the first terminal SW1 and the third terminal SW3 of the potentiometer SW are stator pins, and the second terminal SW2 is a rotor pin, when a voltage difference exists between two ends of the stator pin and the rotor pin of the potentiometer SW, silver migration often occurs to cause a use failure problem, and when the automobile is not started, that is, when the second power circuit 4 does not have an ignition power input, there is no voltage difference between two ends of the stator pin and the rotor pin of the potentiometer SW, that is, there is no risk of silver migration. A third resistor R3 and a first capacitor C1 are connected between the second terminal SW2 of the potentiometer SW and the control unit 1; the third resistor R3 functions as a voltage divider, and the first capacitor C1 functions as a filter, so as to ensure that the output circuit 22 outputs a stable signal to the control circuit.
In one embodiment, the voltage regulation circuit 23 includes a fourth resistor R4, a clamping diode D2, and a second capacitor C2 connected in parallel. In the present embodiment, the voltage regulator 23 divides the voltage through the fourth resistor R4, clamps the potential signal from the second power circuit 4 at a reduced fixed value through the clamping diode D2, and filters the voltage through the second capacitor C2; to reduce the voltage and stabilize the circuit.
In one embodiment, a first diode D1 and a fifth resistor R5 are connected between the second power circuit 4 and the regulator 23. In the present embodiment, the first diode D1 is connected between the second power circuit 4 and the regulator 23 so that the current direction can only flow from the second power circuit 4 to the regulator 23, thereby avoiding the voltage backflow from damaging the circuit. The fifth resistor R5 functions as a voltage divider. To protect the circuit.
In one embodiment, a sixth resistor R6 and a seventh resistor R7 are connected between the voltage regulator circuit 23 and the switch circuit 21. In the present embodiment, the regulator 23 and the switch circuit 21 are provided with a sixth resistor R6 and a seventh resistor R7, which further divide the voltage transmitted from the regulator 23 to protect the circuit, wherein the sixth resistor R6 is connected in series in the loop between the regulator 23 and the switch circuit 21, one end of the seventh resistor R7 is connected in parallel with the sixth resistor R6, and the other end of the seventh resistor is grounded.
In the present embodiment, a switch circuit 21 is provided in the potentiometer circuit, and the on/off of the switch circuit 21 is controlled by the ignition power supply. Thereby controlling the potentiometer to output a control signal to the control unit 1, enabling a static circuit of the potentiometer to be zero under the flameout standby condition, effectively reducing the low static current of the automobile electronic product, and simultaneously reducing the risk of silver migration of the silver potentiometer brought by the potentiometer; after the vehicle is ignited and started, the potentiometer is conducted through the switch circuit 21, and a control signal is output to the control unit 1, so that the functions of the automotive electronic product are awakened again, low static current is achieved at low cost, and the competitiveness of the product is improved.
In one embodiment, a low quiescent current potentiometer circuit is composed of a potentiometer circuit 2, a control unit 1, a first power circuit 3, and a second power circuit 4, wherein the first power circuit 3 is connected to a battery power source, and the second power circuit 4 is connected to an ignition power source. The battery power supply is a power supply which is common in automobile batteries, and the voltage range is 9-16V; the ignition power supply is the power supply which is available after the automobile is plugged with a key to ignite and start, and the voltage range is 9-16V; the battery power supplies power to the power supply conversion chip of the first power supply circuit 3, the first power supply output end VCC1 of the power supply conversion chip outputs power to supply power to the control unit 1 and the potentiometer circuit, the potentiometer circuit is in a working state after receiving a potential signal transmitted from the power supply output end VCC2 of the second power supply circuit 4, and the potentiometer circuit feeds back a SW signal to the control unit 1 when operating the potentiometer.
At the moment of automobile ignition, the voltage transmitted by the second power circuit 4 is input and transmitted out through a power output end VCC2, and is conducted through a first diode D1, the current is limited by a fifth resistor R5, the voltage is pulled down by a fourth resistor R4, a diode D2 is clamped and is clamped to 5V, and a filter capacitor C1 carries out filtering; current limiting resistor: the resistances of the sixth resistor R6, the seventh resistor R7 and the first resistor R1 are all 2.2K, the on-state voltage of the first triode Q1 is 0.7V, the power output terminal VCC2 of the second power circuit 4 is controlled to be 5V by the clamping diode D2 after passing through the first diode D1, the first triode Q1 is turned on through the current-limiting resistor R6, the base of the second triode Q2 is pulled to GND to be turned on, the first power output terminal VCC1 of the first power circuit 3 is turned on to be connected with the potentiometer SW, and the working state is achieved.
When the automobile is not started and in the ignition state, the second power circuit 4 is not input, the power output end VCC2 cannot output, the first triode Q1 is in the cut-off state, no signal is input to the base electrode of the second triode Q2, the second triode Q2 is also in the cut-off state, the potentiometer SW is disconnected from the first power output end VCC1 of the first power circuit 3, and the potentiometer SW does not work. The static current can be effectively reduced by controlling the power supply input of the potentiometer SW through the power supply control circuit. The potentiometer circuit is provided with a switch circuit 21, and the on/off of the switch circuit 21 is controlled by the ignition power supply. Thereby controlling the potentiometer to output a control signal to the control unit 1, enabling a static circuit of the potentiometer to be zero under the flameout standby condition, effectively reducing the low static current of the automobile electronic product, and simultaneously reducing the risk of silver migration of the silver potentiometer brought by the potentiometer; after the vehicle is ignited and started, the potentiometer is conducted through the switch circuit 21, and a control signal is output to the control unit 1, so that the functions of the automotive electronic product are awakened again, low static current is achieved at low cost, and the competitiveness of the product is improved.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.
Claims (8)
1. A low quiescent current potentiometer circuit, comprising at least:
a potentiometer circuit for outputting a control signal to the control unit;
the control unit comprises a control chip and is used for receiving and responding to a control signal from the potentiometer circuit;
the first power supply circuit comprises a power supply conversion chip; one end of the power conversion chip is connected with a battery power supply, and the other end of the power conversion chip is connected with the potentiometer circuit and the control unit and used for supplying power to the potentiometer circuit and the control unit;
one end of the second power supply circuit is connected with an ignition power supply, and the other end of the second power supply circuit is connected with the potentiometer circuit and used for controlling the on-off of the potentiometer circuit;
the potentiometer circuit comprises at least:
the switch circuit is controlled by the second power supply circuit and is used for controlling the potentiometer circuit to be switched on and off;
the output circuit is used for receiving the potential signal from the switch circuit and outputting a control signal to the control unit;
the voltage stabilizing circuit is connected between the power output end of the second power supply circuit and the switch circuit and is used for reducing voltage and stabilizing the circuit;
the switching circuit comprises a first triode and a second triode, wherein the base electrode of the first triode is connected with the output end of the voltage stabilizing circuit, the collector electrode of the first triode is connected with the base electrode of the second triode, and the emitter electrode of the first triode is grounded; and the emitter of the second triode is connected with the first power output end connected with the first power circuit, and the collector of the second triode is connected with the output circuit.
2. A low quiescent current potentiometer circuit according to claim 1, further comprising a first resistor coupled between the collector of said first transistor and the base of said second transistor.
3. A low quiescent current potentiometer circuit according to claim 2, characterized in that a second resistor is connected in parallel between said first resistor and said second transistor, and the other end of said second resistor is connected to the emitter of said second transistor.
4. A low quiescent current potentiometer circuit according to claim 2, characterized in that said output circuit comprises a potentiometer; and a first terminal of the potentiometer is connected with the second triode, a second terminal of the potentiometer is connected with a control signal input end of the control unit and outputs a control signal to the control unit, and a third terminal of the potentiometer is grounded.
5. A low quiescent current potentiometer circuit according to claim 4, further comprising a third resistor and a first capacitor connected between said second terminal of said potentiometer and said control unit.
6. The low quiescent current potentiometer circuit according to claim 1, wherein said regulation circuit comprises a fourth resistor, a clamping diode, and a second capacitor connected in parallel.
7. The low quiescent current potentiometer circuit according to claim 6, wherein a first diode and a fifth resistor are connected in sequence between said second power supply circuit and said voltage regulator circuit.
8. The low quiescent current potentiometer circuit according to claim 6, further comprising a sixth resistor and a seventh resistor connected between said voltage regulator circuit and said switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910397701.6A CN110182151B (en) | 2019-05-14 | 2019-05-14 | Potentiometer circuit with low quiescent current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910397701.6A CN110182151B (en) | 2019-05-14 | 2019-05-14 | Potentiometer circuit with low quiescent current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110182151A CN110182151A (en) | 2019-08-30 |
| CN110182151B true CN110182151B (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910397701.6A Active CN110182151B (en) | 2019-05-14 | 2019-05-14 | Potentiometer circuit with low quiescent current |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005941B (en) * | 2010-10-28 | 2012-12-12 | 广西大学 | Piezoelectric ceramics driving power supply for adjusting numerical control potentiometer |
| CN103738268B (en) * | 2013-11-29 | 2016-03-09 | 天津博信汽车零部件有限公司 | A kind of automobile static current control device |
| CN103770735B (en) * | 2014-01-26 | 2016-03-30 | 浙江吉利控股集团有限公司 | A kind of vehicular meter quiescent current control system |
| CN204249957U (en) * | 2014-11-05 | 2015-04-08 | 中国第一汽车股份有限公司 | The body control system of low speed paper tape reader static power disspation |
| CN204870835U (en) * | 2015-07-07 | 2015-12-16 | 惠州市华阳多媒体电子有限公司 | HUD standby quiescent current control circuit |
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