CN209748864U - Dimmable vehicle-mounted charger control circuit - Google Patents
Dimmable vehicle-mounted charger control circuit Download PDFInfo
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- CN209748864U CN209748864U CN201920120422.0U CN201920120422U CN209748864U CN 209748864 U CN209748864 U CN 209748864U CN 201920120422 U CN201920120422 U CN 201920120422U CN 209748864 U CN209748864 U CN 209748864U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
the utility model discloses a vehicle-mounted charger control circuit can adjust luminance, its input interface, surge protection circuit, prevent reverse circuit, DC-DC converting circuit and USB output interface including connecting gradually, the PWM end of this input interface is connected with LED drive circuit, this LED drive circuit still connects DC-DC converting circuit, this LED drive circuit is connected with the same and parallel connection's of two models LED lamp, this LED drive circuit is including the first switch diode that connects gradually, resistance R22 and triode Q21, this first switch diode is connected with the PWM end of input interface, DC-DC converting circuit is all connected to the positive pole of two parallel connection's LED lamp, triode Q21's C utmost point is connected to the negative pole of two parallel connection's LED lamp, this triode Q21's E utmost point ground connection, this triode Q21's B utmost point connecting resistance R22. The utility model discloses a model of two LED lamps be the same, connect two LED lamps in parallel each other simultaneously, so the electric current and the voltage through the LED lamp are the same thereby it is the same to reach output luminance.
Description
The technical field is as follows:
the utility model relates to the field of electronic technology, refer in particular to a vehicle-mounted charger control circuit can adjust luminance.
Background art:
The vehicle-mounted charger is a vehicle-mounted charger which is powered by a conventional automobile battery (12V for cars and 24V for trucks), and is widely used in the field of lithium battery charging of various portable and handheld devices. Meanwhile, the vehicle-mounted charger is an accessory for facilitating the vehicle-mounted charging power supply of the vehicle owner to charge the digital product at any time and any place. Some high-end vehicle chargers generally include 2 USB interfaces, and can charge two digital products at the same time. The product generally has four safety protection functions of overload protection, short circuit protection, high-voltage input protection and high-temperature protection, and can be safely used.
On the market on-vehicle charger for the cool nature of dazzling of reinforcing, also for better finding the USB interface simultaneously, generally set up the LED lamp in on-vehicle charger to cause this on-vehicle charger's surface can give out light, but the LED light on-vehicle charger's surface is inhomogeneous, and perhaps the part needs 4 LED lamps just can guarantee that the light intensity is even, and the cost is great, if use 2 LED lamps then the light intensity is inhomogeneous, and LED lamp luminance invariant.
In view of the above, the present inventors propose the following.
The utility model has the following contents:
an object of the utility model is to overcome prior art not enough, provide a vehicle-mounted charger control circuit can adjust luminance.
In order to solve the technical problem, the utility model discloses a following technical scheme: the dimmable vehicle-mounted charger control circuit comprises an input interface, a surge protection circuit, a reverse prevention circuit, a DC-DC conversion circuit and a USB output interface which are sequentially connected, wherein the PWM end of the input interface is connected with an LED driving circuit, the LED driving circuit is also connected with the DC-DC conversion circuit, the LED driving circuit is connected with two LED lamps which are the same in model and are connected in parallel, the LED driving circuit comprises a first switch diode, a resistor R22 and a triode Q21 which are sequentially connected, the first switch diode is connected with the PWM end of the input interface, the anodes of the two LED lamps which are connected in parallel are connected with the DC-DC conversion circuit, the cathodes of the two LED lamps which are connected in parallel are connected with the C pole of a triode Q21, the E pole of the triode Q21 is grounded, and the B pole of the triode Q21 is connected with a resistor R22.
Further, in the above technical solution, a third switching diode and a fourth switching diode connected in series are further connected between the C pole and the E pole of the triode Q21, and both the third switching diode and the fourth switching diode are BAV99 in type.
Further, in the foregoing technical solution, the USB output interface is a Type a interface, a transient suppression diode D24 is connected in parallel to a D + end and a D-end of the Type a interface, and a model of the transient suppression diode D24 is MMBZ9V1 AL.
Further, in the above technical solution, the cathode of the LED lamp is further connected to a second switching diode, the second switching diode is further grounded, and the second switching diode is further connected to a resistor R20 and then connected to the first switching diode.
Further, in the above technical solution, the type of the first switching diode is BAV 99; the model of the second switch diode is MMBZ33 VAL.
Furthermore, in the above technical solution, the surge protection circuit includes a transient suppression diode D1, a capacitor C23 connected in parallel to two ends of the transient suppression diode D1, and a capacitor C2 and a capacitor C4 connected in parallel to two ends of the transient suppression diode D1, two ends of the transient suppression diode D1 are further connected to a VI + end and a VI-end of the input interface, respectively, and the model of the transient suppression diode D1 is SMCJ24 CA.
Further, in the above technical solution, the reverse-direction prevention circuit includes a field effect transistor Q1, a transient suppression diode D2, and an inductor L2 connected to each other, and the capacitor 12, the capacitor 13, the capacitor 14, the capacitor 28, and the resistor R2 are connected to the inductor L2.
Further, in the above technical solution, the model of the transient suppression diode D2 is MMBZ9V1 AL; the model of the field effect transistor Q1 is BUK9Y29-40E, 115.
Further, IN the foregoing technical solution, the DC-DC conversion circuit includes a DC-DC conversion chip, an IN pin of the DC-DC conversion chip is connected to the reverse-prevention circuit, an OUT pin of the DC-DC conversion chip is connected to an anode of the LED lamp, a DP pin and a DM pin of the DC-DC conversion chip are respectively connected to a D + terminal and a D-terminal of the Type a interface, a USB pin of the DC-DC conversion chip is connected to a VBUS terminal of the Type a interface, and the model of the DC-DC conversion chip is MPQ4491MGRE-AEC 1.
After the technical scheme is adopted, compared with the prior art, the utility model has following beneficial effect: the utility model discloses a two LED lamp models are the same, connect two LED lamps in parallel each other simultaneously, so the electric current and the voltage through the LED lamp are the same thereby reach output luminance the same, in addition, LED drive circuit controls the break-make through triode Q21 and controls PWM duty cycle thereby adjust the luminance of LED lamp; the C electrode current of the triode Q21 is controlled by the base current, and the C electrode current can be greatly changed due to small change of the B electrode current, and the change meets a certain proportional relation: the change amount of the C electrode current is beta times of the change amount of the B electrode current, namely the current change is amplified by beta, Ic is Ib beta, so that the triode B electrode current controls the C electrode current to control the LED lamp current, the brightness of the LED lamp is controlled, and the brightness of the LED lamp can be changed only by changing the duty ratio of pulses in the PWM end of the input interface. In addition, the LED driving circuit also adopts a first switch diode to protect the circuit; furthermore, the utility model discloses still adopt surge protection circuit, prevent that the reverse circuit from protecting whole circuit, making the utility model discloses whole circuit is more stable, and operating mass is better.
Description of the drawings:
FIG. 1 is a block diagram of the present invention;
Fig. 2 is a circuit diagram of the present invention.
The specific implementation mode is as follows:
The present invention will be further described with reference to the following specific embodiments and accompanying drawings.
Referring to fig. 1 and 2, a dimmable vehicle charger control circuit is provided, which comprises an input interface 1, a surge protection circuit 2, an anti-reverse circuit 3, a DC-DC conversion circuit 4 and a USB output interface 5 connected in sequence, the PWM end of the input interface 1 is connected with an LED drive circuit 6, the LED drive circuit 6 is also connected with the DC-DC conversion circuit 4, the LED driving circuit 6 is connected with two LED lamps 7 which have the same type and are connected in parallel, the LED driving circuit 6 comprises a first switch diode 61, a resistor R22 and a triode Q21 which are connected in sequence, the first switch diode 61 is connected with the PWM end of the input interface 1, the anodes of the two parallel LED lamps 7 are connected with the DC-DC conversion circuit 4, the cathodes of the two parallel LED lamps 7 are connected with the C pole of the triode Q21, the E pole of the transistor Q21 is grounded, and the B pole of the transistor Q21 is connected to the resistor R22. The utility model discloses a two LED lamp models are the same, connect two LED lamps in parallel each other simultaneously, so the electric current and the voltage through the LED lamp are the same thereby reach output luminance the same, in addition, LED drive circuit controls the break-make through triode Q21 and controls PWM duty cycle thereby adjust the luminance of LED lamp; the C electrode current of the triode Q21 is controlled by the base current, and the C electrode current can be greatly changed due to small change of the B electrode current, and the change meets a certain proportional relation: the change amount of the C electrode current is beta times of the change amount of the B electrode current, namely the current change is amplified by beta, Ic is Ib beta, so that the triode B electrode current controls the C electrode current to control the LED lamp current, the brightness of the LED lamp is controlled, and the brightness of the LED lamp can be changed only by changing the duty ratio of pulses in the PWM end of the input interface. In addition, the LED driving circuit also adopts a first switching diode 61 to protect the circuit; furthermore, the utility model discloses still adopt surge protection circuit 2, prevent that reverse circuit 3 from protecting whole circuit, making the utility model discloses whole circuit is more stable, and operating mass is better.
The USB output interface 5 is a Type A interface, a transient suppression diode D24 is connected in parallel with a D + end and a D-end of the Type A interface, the Type of the transient suppression diode D24 is MMBZ9V1AL, and the transient suppression diode D24 of the Type is characterized by high surge resistance and is most suitable for interface protection of electronic components.
The cathode of the LED lamp 7 is further connected to a second switching diode 71, the second switching diode 71 is further grounded, and the second switching diode 71 is further connected to a resistor R20 and then connected to the first switching diode 61, so that the LED lamp 7 can emit light more stably and more uniformly.
A third switching diode 63 and a fourth switching diode 64 which are connected in series are further connected between the C pole and the E pole of the triode Q21, and the types of the third switching diode 63 and the fourth switching diode 64 are both BAV 99. The first switching diode 61 is of the BAV99 type; the model of the second switching diode 71 is MMBZ33 VAL.
the surge protection circuit 2 comprises a transient suppression diode D1, a capacitor C23 connected in parallel with two ends of the transient suppression diode D1, a capacitor C2 connected in parallel with two ends of the transient suppression diode D1, and a capacitor C4, wherein two ends of the transient suppression diode D1 are also respectively connected with a VI + end and a VI-end of the input interface 1, and the model of the transient suppression diode D1 is SMCJ24 CA.
The reverse-direction prevention circuit 3 comprises a field effect transistor Q1, a transient suppression diode D2 and an inductor L2 which are connected with each other, wherein the inductor L2 is connected with a capacitor 12, a capacitor 13, a capacitor 14, a capacitor 28 and a resistor R2.
The model of the transient suppression diode D2 is MMBZ9V1 AL; the model of the field effect transistor Q1 is BUK9Y29-40E, 115.
The DC-DC conversion circuit 4 includes a DC-DC conversion chip 41, an IN pin of the DC-DC conversion chip 41 is connected to the reverse-preventing circuit 3, an OUT pin of the DC-DC conversion chip 41 is connected to the anode of the LED lamp 7, a DP pin and a DM pin of the DC-DC conversion chip 41 are respectively connected to the D + and D-terminals of the Type a interface, a USB pin of the DC-DC conversion chip 41 is connected to the VBUS terminal of the Type a interface, and the DC-DC conversion chip 41 has a model of MPQ4491MGRE-AEC 1.
The utility model can be additionally provided with a photoresistor or other light sensing devices for detecting the light intensity of the external environment, and the technology is a conventional technology and is not repeated; this photo resistance or other photo-sensing device connect DC-DC conversion chip 41, so that the utility model discloses can carry out automatically regulated according to external environment light intensity, luminance is bright daytime, and luminance is darker evening to adapt to the needs of different environment, accord with human engineering, again can the energy saving, reduce the carbon and discharge.
To sum up, the utility model discloses a two LED lamp's model is the same, connects two LED lamps in parallel each other simultaneously, so current and voltage through the LED lamp are the same thereby reach output luminance the same, in addition, LED drive circuit controls the break-make through triode Q21 and controls PWM duty cycle thereby adjust the luminance of LED lamp; the C electrode current of the triode Q21 is controlled by the base current, and the C electrode current can be greatly changed due to small change of the B electrode current, and the change meets a certain proportional relation: the change amount of the C electrode current is beta times of the change amount of the B electrode current, namely the current change is amplified by beta, Ic is Ib beta, so that the triode B electrode current controls the C electrode current to control the LED lamp current, the brightness of the LED lamp is controlled, and the brightness of the LED lamp can be changed only by changing the duty ratio of pulses in the PWM end of the input interface. In addition, the LED driving circuit also adopts a first switching diode 61 to protect the circuit; furthermore, the utility model discloses still adopt surge protection circuit 2, prevent that reverse circuit 3 from protecting whole circuit, making the utility model discloses whole circuit is more stable, and operating mass is better.
Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. on-vehicle charger control circuit of can adjusting luminance, its characterized in that: the LED driving circuit comprises an input interface (1), a surge protection circuit (2), a reverse-direction prevention circuit (3), a DC-DC conversion circuit (4) and a USB output interface (5) which are sequentially connected, wherein the PWM end of the input interface (1) is connected with an LED driving circuit (6), the LED driving circuit (6) is also connected with the DC-DC conversion circuit (4), the LED driving circuit (6) is connected with two LED lamps (7) which are same in type and are connected in parallel, the LED driving circuit (6) comprises a first switching diode (61), a resistor R22 and a triode Q21 which are sequentially connected, the first switching diode (61) is connected with the PWM end of the input interface (1), the anodes of the two LED lamps (7) which are connected in parallel are connected with the DC-DC conversion circuit (4), the cathodes of the two LED lamps (7) which are connected in parallel are connected with each other are connected with the C pole of the triode Q21, the E pole of the transistor Q21 is grounded, and the B pole of the transistor Q21 is connected to the resistor R22.
2. The dimmable vehicle charger control circuit of claim 1, wherein: and a third switching diode (63) and a fourth switching diode (64) which are connected in series are further connected between the C pole and the E pole of the triode Q21, and the types of the third switching diode (63) and the fourth switching diode (64) are both BAV 99.
3. The dimmable vehicle charger control circuit of claim 1, wherein: the USB output interface (5) is a Type A interface, a transient suppression diode D24 is connected in parallel with a D + end and a D-end of the Type A interface, and the Type of the transient suppression diode D24 is MMBZ9V1 AL.
4. The dimmable vehicle charger control circuit of claim 1, wherein: the cathode of the LED lamp (7) is also connected with a second switch diode (71), the second switch diode (71) is also grounded, and the second switch diode (71) is also connected with a resistor R20 and then connected with the first switch diode (61).
5. The dimmable vehicle charger control circuit of claim 4, wherein: the first switching diode (61) is of the BAV99 type; the model of the second switch diode (71) is MMBZ33 VAL.
6. The dimmable vehicle charger control circuit of any of claims 1 to 5, wherein: the surge protection circuit (2) comprises a transient suppression diode D1, a capacitor C23 connected in parallel to two ends of the transient suppression diode D1, a capacitor C2 and a capacitor C4 connected in parallel to two ends of the transient suppression diode D1, two ends of the transient suppression diode D1 are also respectively connected with a VI + end and a VI-end of the input interface (1), and the model of the transient suppression diode D1 is SMCJ24 CA.
7. The dimmable vehicle charger control circuit of claim 6, wherein: the reverse-direction prevention circuit (3) comprises a field effect transistor Q1, a transient suppression diode D2 and an inductor L2 which are connected with each other, wherein the inductor L2 is connected with a capacitor 12, a capacitor 13, a capacitor 14, a capacitor 28 and a resistor R2.
8. The dimmable vehicle charger control circuit of claim 7, wherein: the model of the transient suppression diode D2 is MMBZ9V1 AL; the model of the field effect transistor Q1 is BUK9Y29-40E, 115.
9. The dimmable vehicle charger control circuit of claim 3, wherein: the DC-DC conversion circuit (4) comprises a DC-DC conversion chip (41), wherein an IN pin of the DC-DC conversion chip (41) is connected with the reverse prevention circuit (3), an OUT pin of the DC-DC conversion chip (41) is connected with the anode of the LED lamp (7), a DP pin and a DM pin of the DC-DC conversion chip (41) are respectively connected with the D + end and the D-end of the Type A interface, a USB pin of the DC-DC conversion chip (41) is connected with the VBUS end of the Type A interface, and the Type of the DC-DC conversion chip (41) is MPQ4491MGRE-AEC 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920120422.0U CN209748864U (en) | 2019-01-23 | 2019-01-23 | Dimmable vehicle-mounted charger control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920120422.0U CN209748864U (en) | 2019-01-23 | 2019-01-23 | Dimmable vehicle-mounted charger control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209748864U true CN209748864U (en) | 2019-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920120422.0U Active CN209748864U (en) | 2019-01-23 | 2019-01-23 | Dimmable vehicle-mounted charger control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN209748864U (en) |
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- 2019-01-23 CN CN201920120422.0U patent/CN209748864U/en active Active
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