CN214045467U - PD power supply chip VCC wide voltage power supply circuit - Google Patents
PD power supply chip VCC wide voltage power supply circuit Download PDFInfo
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- CN214045467U CN214045467U CN202120119028.2U CN202120119028U CN214045467U CN 214045467 U CN214045467 U CN 214045467U CN 202120119028 U CN202120119028 U CN 202120119028U CN 214045467 U CN214045467 U CN 214045467U
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Abstract
The utility model discloses a wide voltage supply circuit of PD power supply chip VCC, including transformer T1, triode Q1, triode Q2, operational amplifier U1A, resistance R1, diode D1, resistance R2, resistance R3, resistance R4, zener diode ZD1, diode D2, resistance R5, resistance R8, resistance R7, resistance R6 to and polarity electric capacity CE2 constitutes. The utility model provides a wide voltage supply circuit of PD power supply chip VCC, the wide VCC voltage transformation scope of the elementary PWM chip of adaptation PD power that can be fine can provide reliable and stable voltage for the elementary PWM chip VCC pin of PD power, makes it can be fine supporting elementary PWM chip accomplish the voltage transformation of PD power.
Description
Technical Field
The utility model belongs to the electron field specifically indicates a wide voltage supply circuit of PD power chip VCC.
Background
With the rise of consumer electronic products, the number of matched flyback scheme PD fast-charging adapters is increasing, and due to the characteristic that PD power outputs 3.3-21V and has a wide output range, the VCC voltage range of a primary PWM chip matched with the PD power is about 8 times of the ratio, and as the withstand voltage of many old PWM chips is about 30V, the PD power cannot adapt to the current PD power scheme.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned problem, provide a wide voltage supply circuit of PD power supply chip VCC, the wide VCC voltage transform scope of the elementary PWM chip of adaptation PD power that can be fine can provide reliable and stable voltage for the elementary PWM chip VCC pin of PD power, makes it can be fine supporting elementary PWM chip accomplish the voltage transformation of PD power.
The purpose of the utility model is realized through the following technical scheme:
a wide voltage power supply circuit of PD power supply chip VCC comprises a transformer T1, a triode Q1, a triode Q2, an operational amplifier U1A, a diode D1 of which the A pole is connected with the 5 pin of a transformer T1 and the K pin is connected with the E pole of the triode Q1 after passing through a resistor R1, a resistor R2 connected between the E pole and the B pole of the triode Q1 in series, a resistor R3 of which one end is connected with the K pole of the diode D1 and the other end is connected with the B pole of the triode Q2, a zener diode ZD1 of which the A pole is connected with the E pole of the triode Q2 and the K pole is connected with the E pole of the triode Q1 after passing through the resistor R4, a diode D2 of which the A pole is connected with the K pole and the 1 pin of the operational amplifier U1A, a resistor R5 connected between the 1 pin and the 2 pin of the operational amplifier U1A in series, and a resistor R8653 of which one end is connected with 2.5V and the other end is connected with the reference voltage of the operational amplifier U863, a resistor R7 connected in series with the 2 pin and the 4 pin of the operational amplifier U1A, a resistor R6 connected in series between the 2 pin and the 8 pin of the operational amplifier U1A, and a polarity capacitor CE2 with the anode connected with the 8 pin of the operational amplifier U1A and the cathode connected with the 4 pin of the operational amplifier U1A.
Further, the C pole of the transistor Q1 is connected to the 8 pin of the operational amplifier U1A, and the a pole of the zener diode ZD1 is connected to the 4 pin of the operational amplifier U1A.
Preferably, the a pole of the zener diode ZD1 is grounded, and the negative pole of the polar capacitor CE2 is grounded.
Preferably, the transformer T1 is of model PQ2620, and the operational amplifier U1A is of model LM 358.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model discloses the wide VCC voltage transformation scope of adaptation PD power primary PWM chip that can be fine can provide reliable and stable voltage for PD power primary PWM chip VCC pin, makes it can be fine supporting primary PWM chip accomplish the voltage transformation of PD power.
Drawings
Fig. 1 is a circuit structure diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.
Example 1
As shown in fig. 1, a VCC wide voltage supply circuit of a PD power supply chip includes a transformer T1, a transistor Q1, a transistor Q2, an operational amplifier U1A, a diode D1 whose a pole is connected to a 5 pin of a transformer T1 and whose K pole is connected to the E pole of the transistor Q1 via a resistor R1, a resistor R2 connected in series between the E pole and the B pole of the transistor Q1, a resistor R3 whose one end is connected to the K pole of the diode D1 and whose other end is connected to the B pole of the transistor Q2, a diode D2 whose a pole is connected to a 4 pin of the transformer T1 and whose K pole is connected to the E pole of the transistor Q2 via a resistor R4, a diode D1 whose a pole is connected to the B pole of the transistor Q2 and whose K pole is connected to a 1 pin of the operational amplifier U1A, a resistor ZD R56 connected in series between the 1 pin and the 2 pin of the operational amplifier U1, a resistor ZD 828653 and a resistor V863 connected to the reference voltage of the operational amplifier U1 pin A, a resistor R7 connected in series with the 2 pin and the 4 pin of the operational amplifier U1A, a resistor R6 connected in series between the 2 pin and the 8 pin of the operational amplifier U1A, and a polarity capacitor CE2 with the anode connected with the 8 pin of the operational amplifier U1A and the cathode connected with the 4 pin of the operational amplifier U1A.
The C pole of the triode Q1 is connected with the 8 pin of the operational amplifier U1A, and the a pole of the zener diode ZD1 is connected with the 4 pin of the operational amplifier U1A. The pole a of the zener diode ZD1 is grounded, and the cathode of the polar capacitor CE2 is grounded. The transformer T1 is of model PQ2620, and the operational amplifier U1A is of model LM 358.
Because the turns ratio of the transformer of the VCC winding 4 pin and 5 pin of the transformer T1 and the secondary PD power output 1 pin and 2 pin is fixed, when the PD power output is 3.3V, VCC power supply is rectified by a diode D1 and then supplies power to VCC, the voltage is set to be 12V, at the moment, an operational amplifier U1A does not work, and the voltage is directly filtered by a polar capacitor CE2 through a resistor R1 and an EC electrode of a triode Q1 and then supplies power to VCC; when the PD outputs 21V, the ratio between the output voltage and the VCC voltage is not changed because the 21V voltage is about 6.36 times of the 3.3V voltage, the voltage rectified by the VCC winding through the diode D1 is 12 × 6.36 and is about equal to 76V, one path of the voltage supplies voltage to the C pole of the triode Q2 through the resistor R1 and the resistor R2, the other path supplies voltage to the B pole of the triode Q2 through the resistor R3, and because the positive phase of the operational amplifier U1A is 2.5V reference, the VCC supply voltage supplies voltage to the 2 pins of the operational amplifier U1A after being divided by the resistor R6 and the resistor R7, and the voltage is greater than the 3-pin voltage, the 1-pin of the operational amplifier U1A outputs low level, the B-pole voltage of the diode D2 conducting the triode Q2 is reduced, the triode Q2 is cut off, and the triode Q1 is cut off, so that the VCC power supply voltage is always stabilized at about 15V, and vice versa, the whole voltage stabilizing circuit is always in a switch state to supply power to the VCC, and the loss of the whole VCC voltage stabilizing circuit is reduced.
As described above, the utility model discloses alright fine realization.
Claims (4)
1. A wide voltage supply circuit of PD power supply chip VCC which characterized in that: includes transformer T1, triode Q1, triode Q2, operational amplifier U1A, diode D1 whose A pole is connected with 5 pin of transformer T1 and K pin is connected with E pole of triode Q1 after passing through resistor R1, resistor R2 connected in series between E pole and B pole of triode Q1, resistor R3 whose one end is connected with K pole of diode D1 and the other end is connected with B pole of triode Q2, diode D2 whose A pole is connected with 4 pin of transformer T9 and K pole is connected with E pole of triode Q2 after passing through resistor R4, resistor R5 whose A pole is connected with B pole of triode Q2 and K pole is connected with 1 pin of operational amplifier U1A, resistor R5 connected in series between 1 pin and 2 pin of operational amplifier U1A, resistor ZD 5 whose one end is connected with 2.5V voltage and the other end is connected with ZD 3R pin of operational amplifier U1 5, resistor ZD 5 and operational amplifier U5 connected with ZD 5 and resistor 5 and operational amplifier U5, a resistor R6 connected in series between the 2 pin and the 8 pin of the operational amplifier U1A, and a polarity capacitor CE2 with the anode connected with the 8 pin of the operational amplifier U1A and the cathode connected with the 4 pin of the operational amplifier U1A.
2. The PD power supply chip VCC wide voltage supply circuit of claim 1, characterized in that: the C pole of the triode Q1 is connected with the 8 pin of the operational amplifier U1A, and the a pole of the zener diode ZD1 is connected with the 4 pin of the operational amplifier U1A.
3. The PD power supply chip VCC wide voltage supply circuit of claim 2, characterized in that: the pole a of the zener diode ZD1 is grounded, and the cathode of the polar capacitor CE2 is grounded.
4. The PD power supply chip VCC wide voltage supply circuit of claim 3, characterized in that: the transformer T1 is of model PQ2620, and the operational amplifier U1A is of model LM 358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120119028.2U CN214045467U (en) | 2021-01-15 | 2021-01-15 | PD power supply chip VCC wide voltage power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120119028.2U CN214045467U (en) | 2021-01-15 | 2021-01-15 | PD power supply chip VCC wide voltage power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214045467U true CN214045467U (en) | 2021-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120119028.2U Active CN214045467U (en) | 2021-01-15 | 2021-01-15 | PD power supply chip VCC wide voltage power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214045467U (en) |
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2021
- 2021-01-15 CN CN202120119028.2U patent/CN214045467U/en active Active
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| GR01 | Patent grant | ||
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Address after: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Patentee after: Dongke semiconductor (Anhui) Co.,Ltd. Address before: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Patentee before: ANHUI DONGKE SEMICONDUCTOR Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |