CN210027203U - Vehicle-mounted equipment key lamp control circuit - Google Patents
Vehicle-mounted equipment key lamp control circuit Download PDFInfo
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- CN210027203U CN210027203U CN201920446808.0U CN201920446808U CN210027203U CN 210027203 U CN210027203 U CN 210027203U CN 201920446808 U CN201920446808 U CN 201920446808U CN 210027203 U CN210027203 U CN 210027203U
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Abstract
The utility model provides a key lamp control circuit of mobile unit, the mobile unit mainly includes switch circuit, reverse conduction circuit, key lamp module, constant voltage power supply, receive the voltage signal of on-vehicle battery through reverse conduction circuit, if received voltage signal is the high level and is greater than reverse conduction circuit's conduction voltage, reverse conduction circuit switches on, thereby control switch circuit switches on, switch circuit can put through constant voltage power supply to key lamp module under the on-state, thereby control key lamp module is luminous. Therefore, the embodiment of the utility model provides a under the normal condition of working of on-vehicle battery, can control reverse conduction circuit and switch on to make switch circuit switch on, realize being switched to the power supply of mobile unit to the power supply of key lamp module by the battery to the inside constant voltage power supply of key lamp module, even battery voltage exists undulantly, also can continue to keep the luminance stability of key lamp.
Description
Technical Field
The utility model relates to the field of automotive technology, especially, relate to an on-vehicle equipment presses key lamp control circuit.
Background
At present, the brightness of a key lamp of vehicle-mounted equipment can change along with the voltage change of an automobile battery, so that the brightness of the key lamp during working is not stable. Moreover, under the condition that a user forgets to turn off the key lamp of the vehicle-mounted device during parking, the key lamp cannot be turned off automatically, so that the electric quantity of the automobile battery is wasted, and inconvenience is brought to subsequent trips of the user if the electric quantity of the battery is consumed.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention has been made to provide an in-vehicle device key lamp control circuit that overcomes or at least partially solves the above problems.
According to one aspect of the utility model, a key lamp control circuit of vehicle-mounted equipment is provided, which comprises a reverse conduction circuit, a switch circuit, a key lamp module and a stabilized voltage power supply, wherein,
the reverse conducting circuit is provided with an input end and an output end, the input end of the reverse conducting circuit is used for receiving a voltage signal of the vehicle-mounted battery, the output end of the reverse conducting circuit is connected with the switching circuit, and if the voltage signal received by the input end is greater than the conducting voltage of the reverse conducting circuit, the reverse conducting circuit is conducted to control the switching circuit to be conducted;
the switch circuit is provided with a first end, a second end and a third end, the first end of the switch circuit is connected with the stabilized voltage power supply, the second end of the switch circuit is connected with the output end of the reverse conduction circuit, the third end of the switch circuit is connected with the key lamp module, the stabilized voltage power supply is connected to the key lamp module by the switch circuit in a conduction state, and the key lamp module emits light;
the voltage-stabilizing power supply provides stable voltage for the key lamp module.
Optionally, a voltage signal received by an input terminal of the reverse conducting circuit is reduced to be lower than a conducting voltage of the reverse conducting circuit, the reverse conducting circuit is turned off, and the switch circuit is controlled to be turned off;
the switch circuit disconnects the voltage-stabilized power supply from the key lamp module in a turn-off state, and the key lamp module is turned off.
Optionally, the reverse conducting circuit comprises a resistor R4, a voltage regulator tube Z1, a capacitor C1,
one end of the resistor R4 is connected with the vehicle-mounted battery, and the other end of the resistor R4 is connected with the anode of the voltage regulator tube Z1; the negative electrode of the voltage regulator tube Z1 is connected with one end of the capacitor C1 and the second end of the switch circuit; the other end of the capacitor C1 is grounded;
if the voltage signal received by the resistor R4 is greater than the reverse conducting voltage of the voltage regulator tube Z1, the voltage regulator tube Z1 is conducted in the reverse direction to control the conduction of the switch circuit.
Optionally, the switching circuit comprises: a triode Q2, a resistor R5, a MOS transistor Q1 and a capacitor C3, wherein,
the base electrode of the triode Q2 is connected with the negative electrode of the voltage regulator tube Z1 and one end of the capacitor C1, the emitter electrode of the triode Q2 is grounded, and the collector electrode of the triode Q2 is connected with the grid electrode of the MOS tube Q1;
the source of the MOS tube Q1 is connected with the regulated power supply, and the drain is connected with one end of the capacitor C3 and the key lamp module; the other end of the capacitor C3 is grounded;
the resistor R5 is connected in parallel with the gate and the source of the MOS transistor Q1;
the voltage regulator tube Z1 is conducted reversely, the base voltage of the triode Q2 is pulled high, the triode Q2 is conducted, the MOS tube Q1 is conducted, and the voltage regulator is conducted to the key lamp module.
Optionally, the key lamp module includes:
the key lamp unit comprises a light emitting diode and an attenuation resistor connected in series with the light emitting diode, the anode of the light emitting diode is connected with one end of the capacitor C3, and the other end of the attenuation resistor, which is not connected with the cathode of the light emitting diode, is grounded;
if the key lamp units comprise at least two key lamp units, the at least two key lamp units are connected in parallel.
Optionally, the control circuit further comprises:
and one end of the capacitor C2 is connected with the regulated power supply, and the other end of the capacitor C2 is grounded and is used for filtering the regulated power supply.
The embodiment of the utility model provides an in, mobile unit presses key lamp control circuit mainly includes switch circuit, reverse conduction circuit, presses key lamp module, constant voltage power supply, through reverse conduction circuit receiving vehicle-mounted battery's voltage signal, if received voltage signal is the high level and when being greater than reverse conduction circuit's conduction voltage, reverse conduction circuit switches on to control switch circuit switches on, switch circuit can put through constant voltage power supply to pressing key lamp module under the on-state, thereby control presses the key lamp module to give out light. Therefore, the embodiment of the utility model provides a under the normal condition of working of on-vehicle battery, can control reverse conduction circuit and switch on to make switch circuit switch on, realize being switched to the power supply of mobile unit to the power supply of key lamp module by the battery to the inside constant voltage power supply of key lamp module, even battery voltage exists undulantly, also can continue to keep the luminance stability of key lamp. Further, if the car owner forgets to turn off the key lamp module after parking, along with the reduction of the battery voltage, the battery voltage cannot reach the turn-on voltage of the reverse turn-on circuit, so that the key lamp module of the vehicle-mounted equipment can be automatically turned off, and the key lamp module is prevented from continuing to consume power.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic structural diagram of an on-board device key lamp control circuit according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure 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 disclosure to those skilled in the art.
In order to solve the technical problem, an embodiment of the present invention provides a key lamp control circuit for a vehicle-mounted device, where the circuit includes a reverse conduction circuit 11, a switch circuit 12, a key lamp module 13, and a voltage-stabilized power supply (not shown in fig. 1).
The reverse conducting circuit 11 has an input end and an output end, the input end is used for receiving a voltage signal of a vehicle-mounted battery (not shown in fig. 1), the output end is connected with the switch circuit 12, and if the voltage signal received by the input end is at a high level and is greater than a conducting voltage of the reverse conducting circuit 11, the reverse conducting circuit 11 is conducted, and the switch circuit 12 is controlled to be conducted. Switch circuit 12 has first end, second end and third end, and constant voltage power supply is connected to its first end, and reverse conduction circuit 11's output is connected to the second end, and key lamp module group 13 is connected to the third end, and switch circuit 12 switches on constant voltage power supply to key lamp module group 13 under the on-state, and key lamp module group 13 is luminous. The voltage-stabilized power supply is used for providing stable voltage for the key lamp module 13.
The embodiment of the utility model provides a under the condition of on-vehicle battery normal work, can control reverse conduction circuit 11 and switch on to make switching circuit 12 switch on, realize being switched to the power supply of mobile unit to key lamp module 13 to the inside constant voltage power supply of mobile unit by the battery, even battery voltage exists undulantly, also can continue to keep the luminance stability according to the key lamp.
In an embodiment of the present invention, the voltage signal received by the input terminal of the reverse conducting circuit 11 is reduced to a value below the conducting voltage of the reverse conducting circuit 11, and the reverse conducting circuit 11 is turned off, and the control switch circuit 12 is turned off. The switching circuit 12 disconnects the voltage-stabilized power supply from the key lamp module 13 in the off state, and the key lamp module 13 is turned off.
With reference to fig. 1, in an embodiment of the present invention, the reverse conducting circuit 11 includes a resistor R4, a voltage regulator tube Z1 and a capacitor C1, wherein the resistor R4 is used for receiving a voltage signal of the vehicle-mounted battery, one end of the resistor R4 is connected to the vehicle-mounted battery, the other end of the resistor R is connected to the anode of the voltage regulator tube Z1, the cathode of the voltage regulator tube Z1 is connected to one end of the capacitor C1 and the second end of the switch circuit 12, and the other end of the capacitor C1 is grounded. If the voltage signal received by the resistor R4 is greater than the reverse conduction voltage of the voltage regulator tube Z1, the voltage regulator tube Z1 is conducted in the reverse direction, and the switch circuit 12 is controlled to be conducted.
In this embodiment, a voltage regulator tube Z1 with a conduction voltage drop of 9V is selected, a received voltage signal of the vehicle-mounted battery is an ILL _ PWM signal, a resistor R4 is pulled up to the positive electrode of the vehicle-mounted battery, and the battery provides a voltage of 12V when working normally, when the ILL _ PWM signal is at a high level (such as 12V), the voltage regulator tube Z1 is conducted in a reverse direction, that is, the reverse conduction circuit 11 is conducted, so that the switching circuit 12 can be controlled to be conducted, at this time, a voltage regulator (such as a voltage regulator of 5V) inside the vehicle-mounted equipment can be conducted to the key lamp module 13, and the key lamp module 13 emits light. Even if the voltage of the vehicle-mounted battery fluctuates, the brightness of the key lamp module 13 can be ensured to be stable. The voltage fluctuation referred to herein means a fluctuation in the battery voltage of not less than 9V.
When the ILL _ PWM is low (lower than 9V), the zener diode Z1 is turned off, that is, the reverse conducting circuit 11 is turned off, so that the switching circuit 12 can be controlled to be turned off. Although after the car owner stops and forgets to turn off the key lamp module 13, the key lamp module 13 continues to emit light for a period of time, along with the reduction of the voltage of the storage battery, when the voltage of the storage battery is lower than 9V, the voltage stabilizing tube Z1 cannot be conducted reversely, the voltage stabilizing power supply (such as a 5V voltage stabilizing power supply) and the storage battery cannot provide power for the key lamp module 13, and at the moment, the car-mounted key lamp module 13 can be automatically turned off, so that the electric quantity of the battery is saved.
In an embodiment of the present invention, the switch circuit 12 may include a triode Q2, a resistor R5, a MOS transistor Q1, and a capacitor C3. The base electrode of the triode Q2 is connected with the negative electrode of the voltage regulator tube Z1 and one end of the capacitor C1, the emitting electrode is grounded, and the collector electrode is connected with the grid electrode of the MOS tube Q1. The source of MOS pipe Q1 is connected with regulated power supply, the drain is connected with one end of capacitor C3 and key lamp module 13, the other end of capacitor C3 is earthed. The resistor R5 is connected in parallel with the gate and the source of the MOS transistor Q1.
When the voltage regulator tube Z1 is conducted reversely, the base voltage of the triode Q2 is pulled high, the triode Q2 is conducted, the MOS tube Q1 is conducted, the voltage regulator is conducted to the key lamp module 13, and the key lamp module 13 emits light. After the voltage regulator tube Z1 is cut off, the base voltage of the triode Q2 becomes 0V, the triode Q2 is cut off, the MOS tube Q1 is switched on and off, the voltage regulator tube is disconnected from the key lamp module 13, and the key lamp module 13 is turned off.
In an embodiment of the present invention, the key lamp module 13 includes at least one key lamp unit. The key lamp unit comprises a light emitting diode and an attenuation resistor connected in series with the light emitting diode, the anode of the light emitting diode is connected with one end of a capacitor C3, and the other end of the attenuation resistor, which is not connected with the cathode of the light emitting diode, is grounded.
In this embodiment, if the key lamp units include at least two key lamp units, at least two key lamp units are connected in parallel. In the embodiment shown in fig. 1, 3 parallel key light units are shown, wherein one key light unit includes a light emitting diode D1 and an attenuation resistor R3 connected in series, one key light unit includes a light emitting diode D2 and an attenuation resistor R1 connected in series, and one key light unit includes a light emitting diode D3 and an attenuation resistor R2 connected in series.
The embodiment of the utility model provides a control circuit still includes electric capacity C2, and constant voltage power supply is connected to its one end, other end ground connection, electric capacity C2 are used for the filtering to constant voltage power supply.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be equivalently replaced within the spirit and principles of the present invention; such modifications and substitutions do not depart from the scope of the present invention.
Claims (6)
1. A key lamp control circuit of vehicle-mounted equipment is characterized by comprising a reverse conduction circuit, a switch circuit, a key lamp module and a stabilized voltage power supply, wherein,
the reverse conducting circuit is provided with an input end and an output end, the input end of the reverse conducting circuit is used for receiving a voltage signal of the vehicle-mounted battery, the output end of the reverse conducting circuit is connected with the switching circuit, and if the voltage signal received by the input end is greater than the conducting voltage of the reverse conducting circuit, the reverse conducting circuit is conducted to control the switching circuit to be conducted;
the switch circuit is provided with a first end, a second end and a third end, the first end of the switch circuit is connected with the stabilized voltage power supply, the second end of the switch circuit is connected with the output end of the reverse conduction circuit, the third end of the switch circuit is connected with the key lamp module, the stabilized voltage power supply is connected to the key lamp module by the switch circuit in a conduction state, and the key lamp module emits light;
the voltage-stabilizing power supply provides stable voltage for the key lamp module.
2. The in-vehicle device key lamp control circuit according to claim 1,
the voltage signal received by the input end of the reverse conducting circuit is reduced to be lower than the conducting voltage of the reverse conducting circuit, the reverse conducting circuit is cut off, and the switch circuit is controlled to be switched off;
the switch circuit disconnects the voltage-stabilized power supply from the key lamp module in a turn-off state, and the key lamp module is turned off.
3. The key lamp control circuit of claim 1 or 2, wherein the reverse conducting circuit comprises a resistor R4, a voltage regulator tube Z1, and a capacitor C1,
one end of the resistor R4 is connected with the vehicle-mounted battery, and the other end of the resistor R4 is connected with the anode of the voltage regulator tube Z1; the negative electrode of the voltage regulator tube Z1 is connected with one end of the capacitor C1 and the second end of the switch circuit; the other end of the capacitor C1 is grounded;
if the voltage signal received by the resistor R4 is greater than the reverse conducting voltage of the voltage regulator tube Z1, the voltage regulator tube Z1 is conducted in the reverse direction to control the conduction of the switch circuit.
4. The key lamp control circuit of claim 3, wherein the switch circuit comprises: a triode Q2, a resistor R5, a MOS transistor Q1 and a capacitor C3, wherein,
the base electrode of the triode Q2 is connected with the negative electrode of the voltage regulator tube Z1 and one end of the capacitor C1, the emitter electrode of the triode Q2 is grounded, and the collector electrode of the triode Q2 is connected with the grid electrode of the MOS tube Q1;
the source of the MOS tube Q1 is connected with the regulated power supply, and the drain is connected with one end of the capacitor C3 and the key lamp module; the other end of the capacitor C3 is grounded;
the resistor R5 is connected in parallel with the gate and the source of the MOS transistor Q1;
the voltage regulator tube Z1 is conducted reversely, the base voltage of the triode Q2 is pulled high, the triode Q2 is conducted, the MOS tube Q1 is conducted, and the voltage regulator is conducted to the key lamp module.
5. The key lamp control circuit of claim 3, wherein the key lamp module comprises:
the key lamp unit comprises a light emitting diode and an attenuation resistor connected in series with the light emitting diode, the anode of the light emitting diode is connected with one end of the capacitor C3, and the other end of the attenuation resistor, which is not connected with the cathode of the light emitting diode, is grounded;
if the key lamp units comprise at least two key lamp units, the at least two key lamp units are connected in parallel.
6. The key lamp control circuit of claim 3, wherein the control circuit further comprises:
and one end of the capacitor C2 is connected with the regulated power supply, and the other end of the capacitor C2 is grounded and is used for filtering the regulated power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920446808.0U CN210027203U (en) | 2019-04-03 | 2019-04-03 | Vehicle-mounted equipment key lamp control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920446808.0U CN210027203U (en) | 2019-04-03 | 2019-04-03 | Vehicle-mounted equipment key lamp control circuit |
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| Publication Number | Publication Date |
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| CN210027203U true CN210027203U (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920446808.0U Active CN210027203U (en) | 2019-04-03 | 2019-04-03 | Vehicle-mounted equipment key lamp control circuit |
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| CN (1) | CN210027203U (en) |
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Effective date of registration: 20220323 Address after: 430051 No. b1336, chuanggu startup area, taizihu cultural Digital Creative Industry Park, No. 18, Shenlong Avenue, Wuhan Economic and Technological Development Zone, Wuhan, Hubei Province Patentee after: Yikatong (Hubei) Technology Co.,Ltd. Address before: No.c101, chuanggu start up area, taizihu cultural Digital Industrial Park, No.18 Shenlong Avenue, Wuhan Economic Development Zone, Hubei Province Patentee before: HUBEI ECARX TECHNOLOGY Co.,Ltd. |