CN210518942U - USB charger changes lamp circuit - Google Patents
USB charger changes lamp circuit Download PDFInfo
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- CN210518942U CN210518942U CN201921636180.7U CN201921636180U CN210518942U CN 210518942 U CN210518942 U CN 210518942U CN 201921636180 U CN201921636180 U CN 201921636180U CN 210518942 U CN210518942 U CN 210518942U
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model relates to a USB charger changes lamp circuit, including rectification filtering voltage stabilizing circuit, switching power supply circuit, USB interface, LED control circuit, outside interchange is connected to rectification filtering voltage stabilizing circuit's input, and rectification filtering voltage stabilizing circuit's output connects switching power supply circuit's input, and USB interface and LED control circuit are connected respectively to switching power supply's output. The utility model discloses USB charger changes lamp circuit adopts PWM pulse width control mode to trigger MOS pipe Q1, realizes that emitting diode LED1 shines and changes the lamp effect not bright, and rectifier diode D3, D4 adopt just excited connection, should change lamp circuit and only relevant with the size of load, and are irrelevant with input voltage, so standby and during operation low power dissipation, efficient, and the components and parts that should constitute are few, low in production cost.
Description
Technical Field
The utility model relates to a charger circuit especially relates to a USB charger changes lamp circuit.
Background
The lamp rotating circuit on the USB charger is used for prompting the current charging state of a charging device, namely the feedback of the charging state is realized through the on and off of the rotating lamp, and the human-computer interaction experience of the USB charger is improved.
Most chargers in the existing market do not have a lamp rotating circuit, only an indicator light circuit is arranged, and a light emitting diode of the indicator light circuit is always lighted when the indicator light circuit is in standby and load charging.
Disclosure of Invention
In view of this, the utility model aims at providing a circuit connection is simple, the standby is low with during operation consumption, efficient USB charger changes lamp circuit.
In order to achieve the above object, the utility model adopts such a USB charger light-turning circuit, which comprises a rectifying and filtering voltage-stabilizing circuit, a switching power supply circuit, a USB interface, and an LED control circuit, wherein the input end of the rectifying and filtering voltage-stabilizing circuit is connected with the external alternating current, the output end of the rectifying and filtering voltage-stabilizing circuit is connected with the input end of the switching power supply circuit, the output end of the switching power supply circuit is respectively connected with the USB interface and the LED control circuit, the LED control circuit comprises a diode D3, a diode D4, a resistor R13, a resistor R16, a resistor R17, a capacitor C8, a capacitor C9, a light emitting diode LED1, and a MOS transistor Q1, the diode D3, the resistor R13, and the resistor R16 are sequentially connected in series, the diode D8, the light emitting diode LED1, and the resistor R17 are sequentially connected in series, the anode of the diode D3 is connected with the anode of the diode D4, one end of the resistor R17 is connected with the source, the capacitor C9 is connected in parallel at two ends of the resistor R16, the gate of the MOS transistor Q1 is connected with the other end of the resistor R16, one end of the capacitor C8 is connected with the cathode of the diode D4, the other end of the capacitor C8 is connected with the drain of the MOS transistor Q1, and the anode of the diode D4 and the drain of the MOS transistor Q1 are respectively connected with the output end of the switching power supply circuit.
Above-mentioned USB charger changes lamp circuit is through setting up LED control circuit, and its theory of operation is: one path of the voltage is rectified by a diode D4 and filtered by a capacitor C8, then a stable pulsating direct current voltage is provided for the LED1, the other path of the voltage is rectified by a diode D3, filtered by a capacitor C9, and divided by a resistor R13 and a resistor R16, and then a voltage is provided for the grid electrode of the MOS tube Q1 to control the on and off of the MOS tube Q1, so that the on and off of the LED1 are controlled, because the divided voltage values of the resistor R13 and the resistor R16 are only related to PWM pulses, the PWM pulse width is related to the change of a load, namely the LED1 is not lighted when no load is charged, and the LED1 is lighted when a load is charged, thereby achieving the effect of turning the lamp. The utility model discloses USB charger changes lamp circuit adopts PWM pulse width control mode to trigger MOS pipe Q1, realizes that emitting diode LED1 shines and the commentaries on classics lamp effect that does not shine, and rectifier diode D3, D4 adopt just excited connection, should change lamp circuit and only relevant with the size of load, and are irrelevant with input voltage, so standby and during operation low power dissipation, efficient, and the components and parts that should constitute are few, low in production cost.
The utility model is further arranged in that the switching power supply circuit comprises a transformer T1A, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R11, a resistor R12, a resistor R14, a resistor R15, a capacitor C3, a capacitor C4, a capacitor C6, a capacitor C10, a diode D1, a diode D2, a switching power supply chip U1 with the model OB2571TCP, and a synchronous rectifier chip U2 with the model OB2005WKCP, wherein the transformer T1A comprises a primary winding Np, a secondary winding Ns and an auxiliary winding Naux, the capacitor C4, the resistor R5 and the diode D1 are sequentially connected in series, a resistor R2, a resistor R3 and a capacitor C3 are sequentially connected in series, one end of the primary winding Np is respectively connected with one end of a resistor R4, one end of the capacitor C4, one end of the R72, one end of the R4, the other end of the R4 is connected with a negative pole of the switch power supply chip of the diode D4, and the negative pole of the diode, A sixth pin, a seventh pin and an eighth pin are all connected with the anode of a diode D1, the resistor R6, the diode D2, the resistor R7 and the resistor R8 are sequentially connected in series, a first pin of a switching power supply chip U1 is respectively connected with one end of a resistor R6 and one end of a resistor R3, a second pin of the switching power supply chip U1 is respectively connected with one end of a resistor R9 and one end of a resistor R8, a fourth pin of the switching power supply chip U1 is respectively connected with one end of the resistor R12 and one end of a resistor R15, one end of an auxiliary winding Naux is connected with the anode of the diode D2, the other end of the auxiliary winding Naux, the other end of the resistor R8, the other end of the resistor R9, one end of a capacitor C3, a third pin of the switching power supply chip U1, the other end of the resistor R12 and the other end of the resistor R15 are all grounded, one end of the primary side of the Np and the other end of the auxiliary winding na, one end of the secondary winding Ns is connected with the anode of the diode D4, one end of the resistor R14 and one end of the resistor R11 respectively, the other end of the resistor R14 is grounded, the capacitor C6 is connected in parallel with two ends of the resistor R14, the other end of the resistor R11 is connected with the fourth pin of the synchronous rectification chip U2, the third pin of the synchronous rectification chip U2 is connected with one end of the capacitor C10, the other end of the capacitor C10, the second pin of the synchronous rectification chip U2 and the first pin of the synchronous rectification chip U2 are grounded, the fifth pin, the sixth pin, the seventh pin and the eighth pin of the synchronous rectification chip U2 are connected with the other end of the secondary winding Ns, and the other end of the secondary winding Ns is connected with the other end of the capacitor C8.
The utility model discloses the one end that further sets up to resistance R11 exports 5V's direct current voltage for the USB interface.
The primary side of the transformer T1A on the switching power supply circuit is controlled by the primary side of a switching power supply chip with the model OB2571TCP, and the secondary side of the transformer T1A is provided with a synchronous rectification chip U2 with the model OB2005 WKCP.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Detailed Description
As shown in figure 1, the utility model relates to a USB charger lamp-rotating circuit, which comprises a rectifying and filtering voltage-stabilizing circuit 1, a switching power supply circuit 2, a USB interface 3 and an LED control circuit 4, wherein the input end of the rectifying and filtering voltage-stabilizing circuit 1 is connected with external alternating current, the output end of the rectifying and filtering voltage-stabilizing circuit 1 is connected with the input end of the switching power supply circuit 2, the output end of the switching power supply circuit 2 is respectively connected with the USB interface 3 and the LED control circuit 4,
the switching power supply circuit comprises a transformer T1A, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R11, a resistor R12, a resistor R14, a resistor R15, a capacitor C3, a capacitor C4, a capacitor C6, a capacitor C10, a diode D1, a diode D2, a switching power supply chip U1 with the model of OB2571TCP, and a synchronous rectification chip U2 with the model of OB2005WKCP, wherein the transformer T1A comprises a primary winding Np, a secondary winding and an auxiliary winding NauNs, the capacitor C4, the resistor R5 and the diode D1 are sequentially connected in series, the resistor R2, the resistor R3 and the capacitor C3 are sequentially connected in series, one end of the primary winding Np is respectively connected with one end of a resistor R4, one end of a capacitor C4, one end of the resistor R4, one end of the other end of the R4 is connected with a negative pole of a power supply chip of a switch 4, and a negative pole of a diode of a, A sixth pin, a seventh pin and an eighth pin are all connected with the anode of a diode D1, the resistor R6, the diode D2, the resistor R7 and the resistor R8 are sequentially connected in series, a first pin of a switching power supply chip U1 is respectively connected with one end of a resistor R6 and one end of a resistor R3, a second pin of the switching power supply chip U1 is respectively connected with one end of a resistor R9 and one end of a resistor R8, a fourth pin of the switching power supply chip U1 is respectively connected with one end of the resistor R12 and one end of a resistor R15, one end of an auxiliary winding Naux is connected with the anode of the diode D2, the other end of the auxiliary winding Naux, the other end of the resistor R8, the other end of the resistor R9, one end of a capacitor C3, a third pin of the switching power supply chip U1, the other end of the resistor R12 and the other end of the resistor R15 are all grounded, one end of the primary side of the Np and the other end of the auxiliary winding na, one end of the secondary winding Ns is connected with the anode of the diode D4, one end of the resistor R14 and one end of the resistor R11 respectively, the other end of the resistor R14 is grounded, the capacitor C6 is connected in parallel with two ends of the resistor R14, the other end of the resistor R11 is connected with the fourth pin of the synchronous rectification chip U2, the third pin of the synchronous rectification chip U2 is connected with one end of the capacitor C10, the other end of the capacitor C10, the second pin of the synchronous rectification chip U2 and the first pin of the synchronous rectification chip U2 are grounded, the fifth pin, the sixth pin, the seventh pin and the eighth pin of the synchronous rectification chip U2 are connected with the other end of the secondary winding Ns, the other end of the secondary winding Ns is connected with the other end of the capacitor C8, one end of the resistor R11 outputs 5V dc voltage to the USB interface,
the LED control circuit comprises a diode D3, a diode D4, a resistor R13, a resistor R16, a resistor R17, a capacitor C8, a capacitor C9, a light emitting diode LED 9 and a MOS tube Q9, wherein the diode D9, the resistor R9 and the resistor R9 are sequentially connected in series, the diode D9, the light emitting diode LED 9 and the resistor R9 are sequentially connected in series, the anode of the diode D9 is connected with the anode of the diode D9, one end of the resistor R9 is connected with the source of the MOS tube Q9, one end of the resistor R9 is connected with the drain of the MOS tube Q9, the capacitor C9 is connected with two ends of the resistor R9 in parallel, the gate of the MOS tube Q9 is connected with the other end of the resistor R9, one end of the capacitor C9 is connected with the cathode of the diode D9, the other end of the capacitor C9 is connected with the drain of the MOS tube Q9, and the drain of the anode of the diode D9 and the drain of the.
Claims (3)
1. The utility model provides a USB charger changes lamp circuit which characterized in that: the LED constant-current power supply comprises a rectifying and filtering voltage stabilizing circuit, a switching power supply circuit, a USB interface and an LED control circuit, wherein the input end of the rectifying and filtering voltage stabilizing circuit is connected with external alternating current, the output end of the rectifying and filtering voltage stabilizing circuit is connected with the input end of the switching power supply circuit, the output end of the switching power supply circuit is respectively connected with the USB interface and the LED control circuit, the LED control circuit comprises a diode D3, a diode D4, a resistor R13, a resistor R16, a resistor R17, a capacitor C8, a capacitor C9, a light-emitting diode LED1 and an MOS tube Q1, the diode D3, a resistor R13 and a resistor R16 are sequentially connected in series, a diode D4, a light-emitting diode LED1 and a resistor R17 are sequentially connected in series, the anode of the diode D3 is connected with the anode of the diode D4, one end of the resistor R17 is connected with the source of an MOS tube Q1, one end of the resistor R16 is connected with the drain of the MOS tube Q1, the drain of, one end of the capacitor C8 is connected with the cathode of the diode D4, the other end of the capacitor C8 is connected with the drain of the MOS tube Q1, and the anode of the diode D4 and the drain of the MOS tube Q1 are respectively connected with the output end of the switching power supply circuit.
2. The USB charger relay circuit of claim 1, wherein: the switching power supply circuit comprises a transformer T1, a resistor R, a capacitor C, a diode D, a switching power supply chip U and a synchronous rectification chip U, wherein the transformer T1 comprises a primary winding Np, a secondary winding Ns and an auxiliary winding Naux, the capacitor C, the resistor R and the diode D are sequentially connected in series, the resistor R and the capacitor C are sequentially connected in series, one end of the primary winding Np is respectively connected with one end of the resistor R, one end of the capacitor C and one end of the resistor R, the other end of the resistor R is connected with the cathode of the diode D, the other end of the primary winding Np is connected with the anode of the diode D, and a fifth pin, a sixth pin, a seventh pin and a seventh pin of the switching power supply chip, The eighth pin is connected with the anode of a diode D1, the resistor R6, the diode D2, the resistor R7 and the resistor R8 are sequentially connected in series, the first pin of the switching power supply chip U1 is connected with one end of the resistor R6 and one end of the resistor R3 respectively, the second pin of the switching power supply chip U1 is connected with one end of the resistor R9 and one end of the resistor R8 respectively, the fourth pin of the switching power supply chip U1 is connected with one end of the resistor R12 and one end of the resistor R15 respectively, one end of the auxiliary winding Naux is connected with the anode of the diode D2, the other end of the auxiliary winding Naux, the other end of the resistor R8, the other end of the resistor R9, one end of the capacitor C3, the third pin of the switching power supply chip U1, the other end of the resistor R12 and the other end of the resistor R15 are all grounded, one end of the primary winding Np and the other end of the auxiliary winding Naux are connected with the output end of the rectifying winding filter voltage regulator circuit, one end of the, One end of a resistor R14, one end of a resistor R11, the other end of a resistor R14 is grounded, a capacitor C6 is connected in parallel with two ends of the resistor R14, the other end of the resistor R11 is connected with a fourth pin of a synchronous rectification chip U2, a third pin of the synchronous rectification chip U2 is connected with one end of the capacitor C10, the other end of a capacitor C10, a second pin of the synchronous rectification chip U2 and a first pin of the synchronous rectification chip U2 are grounded, a fifth pin, a sixth pin, a seventh pin and an eighth pin of the synchronous rectification chip U2 are connected with the other end of the secondary winding Ns, and the other end of the secondary winding Ns is connected with the other end of the capacitor C8.
3. The USB charger relay circuit of claim 2, wherein: one end of the resistor R11 outputs 5V DC voltage to the USB interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921636180.7U CN210518942U (en) | 2019-09-28 | 2019-09-28 | USB charger changes lamp circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921636180.7U CN210518942U (en) | 2019-09-28 | 2019-09-28 | USB charger changes lamp circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210518942U true CN210518942U (en) | 2020-05-12 |
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ID=70572153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921636180.7U Active CN210518942U (en) | 2019-09-28 | 2019-09-28 | USB charger changes lamp circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210518942U (en) |
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2019
- 2019-09-28 CN CN201921636180.7U patent/CN210518942U/en active Active
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