CN220190682U - DC/DC chip working state conversion circuit - Google Patents
DC/DC chip working state conversion circuit Download PDFInfo
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- CN220190682U CN220190682U CN202320639800.2U CN202320639800U CN220190682U CN 220190682 U CN220190682 U CN 220190682U CN 202320639800 U CN202320639800 U CN 202320639800U CN 220190682 U CN220190682 U CN 220190682U
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- chip
- conversion circuit
- state conversion
- triode
- operating state
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 22
- 230000003111 delayed effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model relates to a DC/DC chip working state conversion circuit, which is matched with a DC/DC chip and comprises a bias voltage generating circuit matched with the DC/DC chip, wherein the bias voltage generating circuit is connected to a controller unit. The utility model adopts a single external bias circuit to control the FB pin voltage commonly existing in the DC/DC chip, so as to realize the state control of the common DC/DC power supply conversion chip in the market and complete the control of the delay start or working state conversion of the DC/DC circuit; the circuit has simple structure and low cost, and is convenient to maintain and adjust.
Description
Technical Field
The utility model relates to the technical field of electricity, in particular to a DC/DC chip working state conversion circuit.
Background
When the switching power supply is powered on, the capacitor can be regarded as a short circuit in transient state, so that a very large impact current is generated, and the amplitude of the impact current is generally much larger than that of steady-state working current, if the impact current is not limited, the impact current can burn out fuses and connectors, and the impact current is also very likely to interfere with nearby electrical equipment due to common input impedance.
The magnitude of the surge current is determined by many factors, including but not limited to, the magnitude of the input voltage, the impedance of the input wire, the input inductance and equivalent impedance of the power supply, the equivalent series impedance of the input capacitance, etc., and in the electric and electronic equipment, in order to avoid the surge effect on the load side caused by the power supply, a circuit structure for delayed power supply needs to be provided.
In the prior art, the relay is used for delayed conduction or a DC/DC chip with an enabling function is used for performing delayed power supply in an enabling control mode; however, the former has high cost and limited service life of the relay contacts, and the impact current easily causes equipment faults caused by contact burning, while the latter has the problems of few chip types, early power chips and limited performance.
Disclosure of Invention
The utility model solves the problems existing in the prior art and provides a DC/DC chip working state conversion circuit.
The technical scheme adopted by the utility model is that the DC/DC chip working state conversion circuit is matched with the DC/DC chip, the circuit comprises a bias voltage generating circuit matched with the DC/DC chip, and the bias voltage generating circuit is connected to the controller unit.
Preferably, the bias voltage generating circuit is matched with the FB pin of the DC/DC chip.
Preferably, the bias voltage generating circuit includes a triode, a base electrode of the triode is connected to an output control end of the controller unit through a resistor R4, an emitter electrode of the triode is grounded, and a collector electrode of the triode is connected to an FB pin of the DC/DC chip through a diode.
Preferably, the triode is an NPN triode.
Preferably, the diode is conducted from the collector of the triode to the ground terminal.
Preferably, a voltage dividing resistor R2 is arranged between the collector of the triode and the input voltage.
Preferably, the resistance of R2 is 5100Ω.
Preferably, a current limiting resistor R3 is arranged between the output end of the diode and the ground terminal.
Preferably, the resistance of R3 is 1000Ω.
Preferably, a load is matched between the SW pin of the DC/DC chip and the grounding terminal.
The utility model provides a DC/DC chip working state conversion circuit, which is matched with a DC/DC chip and comprises a bias voltage generating circuit matched with the DC/DC chip, wherein the bias voltage generating circuit is connected to a controller unit.
The utility model has the beneficial effects that:
(1) The independent external bias circuit is adopted to control the FB pin voltage commonly existing in the DC/DC chip, so that the state control of the common DC/DC power supply conversion chip in the market is realized, and the control of the delay starting or working state conversion of the DC/DC circuit is completed;
(2) The circuit has simple structure and low cost, and is convenient to maintain and adjust.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
fig. 2 is a circuit schematic of an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to examples, but the scope of the present utility model is not limited thereto.
As shown in fig. 1, the present utility model relates to a DC/DC chip operating state conversion circuit provided in cooperation with a DC/DC chip, the circuit including a bias voltage generating circuit provided in cooperation with a DC/DC chip, the bias voltage generating circuit being connected to a controller unit.
In the utility model, the controller unit changes the output signal through the bias voltage generating circuit, so as to control the feedback signal of the FB pin commonly existing in the DC/DC chip, realize the state control of the common DC/DC chip, and complete the control of the delay start or working state conversion of the DC/DC circuit.
In the utility model, the controller unit is connected to the controller power supply loop, and the DC/DC circuit is also connected to the power supply end.
An embodiment is provided below in connection with fig. 2.
The resistor R2, the triode Q1, the diode D2, the resistor R4 and the resistor R3 in fig. 2 integrally form a bias voltage generating circuit, the bias voltage generating circuit and the DC/DC chip are cooperatively arranged by adopting the FB pin of the XL4015 chip, the FB pin is used as a feedback pin, and the output voltage is sensed and regulated at the FB pin through an external resistor divider network, so that the feedback threshold voltage is generally 1.25V.
In the embodiment, the triode Q1 is a 9013 triode, the base is connected to the output control end of the controller unit through the resistor R4, the controller unit outputs a control signal through the output control end, the emitter is grounded, and the collector is connected to the FB pin of the DC/DC chip through the diode D2.
In the embodiment, the diode D2 is conducted from the collector of the transistor Q1 to the ground, specifically, the diode D2 is conducted from the collector of the transistor Q1 to the ground through the resistor R3.
In the embodiment, a voltage dividing resistor R2 is arranged between the collector electrode of the triode and the input voltage, and the resistor is 5100Ω; further, a current limiting resistor R3 is arranged between the output end of the diode and the grounding end, and the resistor is 1000 omega.
In an embodiment, a load is cooperatively arranged between the SW pin of the DC/DC chip and the ground terminal.
In this embodiment, when the control signal output by the controller unit is at a high level, the bias voltage generating circuit outputs a 0V bias voltage, and the DC/DC chip operates normally to output a voltage; when the control signal output by the controller unit is at a low level, the output voltage of the bias voltage generating circuit is as follows:
Vout=VCC*R2/((R1//R3)+R2)+0.7
accordingly, R1, R2 and R3 are adjusted until 7> Vout >1.3 is met, the DC/DC chip stops working, and the power supply output is closed.
In this embodiment, the controller unit is configured by the power supply of the controller unit and the controller unit in cooperation, as will be readily understood by those skilled in the art.
In this embodiment, for the application of the XL4015 chip and other electric devices of the load component, including but not limited to C1, L1, R1, C2, etc. in fig. 2, which are easily understood by those skilled in the art, those skilled in the art can set the device on their own based on the requirements.
Claims (9)
1. The utility model provides a DC/DC chip operating condition conversion circuit, cooperation DC/DC chip sets up, its characterized in that: the circuit includes a bias voltage generating circuit disposed in cooperation with the DC/DC chip, the bias voltage generating circuit disposed in cooperation with the FB pin of the DC/DC chip, the bias voltage generating circuit being connected to the controller unit.
2. The DC/DC chip operating state conversion circuit according to claim 1, wherein: the bias voltage generating circuit comprises a triode, wherein the base electrode of the triode is connected to the output control end of the controller unit through a resistor R4, the emitting electrode of the triode is grounded, and the collecting electrode of the triode is connected to the FB pin of the DC/DC chip through a diode.
3. The DC/DC chip operating state conversion circuit according to claim 2, wherein: the triode is an NPN triode.
4. The DC/DC chip operating state conversion circuit according to claim 2, wherein: the diode is conducted from the collector electrode of the triode to the grounding end.
5. The DC/DC chip operating state conversion circuit according to claim 2, wherein: a divider resistor R2 is arranged between the collector of the triode and the input voltage.
6. The DC/DC chip operating state conversion circuit according to claim 5, wherein: the resistance of R2 is 5100Ω.
7. The DC/DC chip operating state conversion circuit according to claim 2, wherein: and a current limiting resistor R3 is arranged between the output end of the diode and the grounding end.
8. The DC/DC chip operating state conversion circuit according to claim 7, wherein: the resistance of R3 is 1000Ω.
9. The DC/DC chip operating state conversion circuit according to claim 1, wherein: and a load is matched between the SW pin of the DC/DC chip and the grounding end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320639800.2U CN220190682U (en) | 2023-03-28 | 2023-03-28 | DC/DC chip working state conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320639800.2U CN220190682U (en) | 2023-03-28 | 2023-03-28 | DC/DC chip working state conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220190682U true CN220190682U (en) | 2023-12-15 |
Family
ID=89115315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320639800.2U Active CN220190682U (en) | 2023-03-28 | 2023-03-28 | DC/DC chip working state conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220190682U (en) |
-
2023
- 2023-03-28 CN CN202320639800.2U patent/CN220190682U/en active Active
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