Fixed voltage output circuit

Abstract

The utility model provides a fixed voltage output circuit, which belongs to the technical field of fixed voltage output and comprises a control unit, a power supply unit, an output unit and a detection unit, the output end of the control unit is connected with the input end of the output unit, and the output end of the power supply unit is connected with the input end of the output unit. The output end of the output unit is connected with the input end of the detection unit, and the output end of the detection unit is connected with the input end of the control unit. The control unit outputs a control signal to the output unit, the power supply unit outputs power to the output unit, and the output unit outputs fixed voltage information to the control unit through the detection unit. The utility model provides a fixed voltage circuit, which ensures the stability of voltage output and meets the requirement of automobile devices on stable voltage.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the fixed voltage output technical field, specifically, the utility model relates to a fixed voltage output circuit. BACKGROUND

[0002] With the market demand of the intelligentization of the automobile, the automobile is loaded with more electronic devices, part electronic device does not have power supply itself, but its normal work needs a stable voltage, and the stability of the voltage of the whole vehicle power supply cannot be guaranteed.

[0003] Chinese patent 212499999U discloses a vehicle power management system and an automatic driving vehicle. The vehicle power management system is provided with a main control module for monitoring the sensor power supply voltage of each sensor power supply, an Ethernet circuit and a sensor power supply button circuit electrically connected with the main control module respectively, the sensor power supply voltage monitored is fed back to a remote server through the Ethernet circuit and a corresponding sensor power supply control signal sent by the remote server is received, and finally the sensor power supply button circuit is controlled according to the corresponding sensor power supply control signal to control the on-off between the corresponding sensor power supply and the vehicle storage battery.

[0004] The prior art does not consider the stability of the working voltage, which will affect the stability of the working of the automobile device. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a fixed voltage output circuit to solve the problem of providing stable voltage and improving the working stability of the automobile device.

[0006] In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is:

[0007] The utility model provides a fixed voltage output circuit, which comprises a control unit, a power supply unit, an output unit and a detection unit, the output end of the control unit is connected with the input end of the output unit, the output end of the power supply unit is connected with the input end of the output unit, the output end of the output unit is connected with the input end of the detection unit, and the output end of the detection unit is connected with the input end of the control unit.

[0008] The control unit outputs a control signal to the output unit, the power supply unit outputs a power supply to the output unit, and the output unit outputs fixed voltage information to the control unit through the detection unit.

[0009] The control unit adopts a microcontroller.

[0010] The output unit comprises a first resistor, a second resistor, a third resistor, a sixth resistor, a seventh resistor, a first triode, a second triode, a third triode, a voltage stabilizing tube and a first capacitor.

[0011] The control unit connects the base of the third triode through the sixth resistance, the base of the third triode connects the emitter of the third triode through the seventh resistance, the emitter of the third triode is grounded, the collector of the third triode connects the base of the first triode through the second resistance, the base of the first triode connects the emitter of the first triode through the first resistance, the emitter of the first triode is connected to the power supply unit, the collector of the first triode is connected to the collector of the second triode, the collector of the second triode connects the base of the second triode through the third resistance, the base of the second triode is connected to the cathode of the voltage stabilizing tube, the anode of the voltage stabilizing tube is grounded, and the emitter of the second triode is the output end of the output unit, and the output end of the output unit is grounded through the first capacitor.

[0012] The detection unit comprises a fourth resistance, a fifth resistance and a second capacitor.

[0013] The output end of the output unit is connected to the fifth resistance through the fourth resistance, the other end of the fifth resistance is grounded, the middle node of the fourth resistance and the fifth resistance is connected to the input end of the control unit, and the input end of the control unit is grounded through the second capacitor.

[0014] The technical effects of the utility model are as follows:

[0015] (1) The utility model provides a fixed voltage circuit, guarantees the stability of voltage output, and meets the demand of automobile device to stable voltage.

[0016] (2) The utility model detects the fixed voltage output, and shuts off the circuit when the fixed voltage is abnormal, thereby improving the safety of the circuit.

[0017] (3) The utility model has simple and effective circuit structure and low cost. DRAWINGS

[0018] The present specification comprises the following drawings, and the shown contents are as follows:

[0019] Figure 1 It is a logic structure block diagram of the utility model fixed voltage output circuit;

[0020] Figure 2 It is a circuit diagram of the utility model fixed voltage output circuit;

[0021] Figure 3 It is an effect diagram of the utility model fixed voltage output circuit;

[0022] Figure 1 The middle mark is: 1, control unit; 2, power supply unit; 3, output unit; 4, detection unit. DETAILED DESCRIPTION

[0023] The specific embodiments of the utility model are further explained in detail below with reference to the drawings and the description of the embodiments, which aims to help the skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical scheme of the utility model, and to help its implementation.

[0024] The utility model provides a kind of fixed voltage output circuit, including control unit 1, power supply unit 2, output unit 3 and detection unit 4, the output end of control unit 1 is connected the input end of output unit 3, the output end of power supply unit 2 is connected the input end of output unit 3, the output end of output unit 3 is connected the input end of detection unit 4, the output end of detection unit 4 is connected the input end of control unit 1.

[0025] Control unit 1 exports control signal to output unit 3, power supply unit 2 exports power supply to output unit 3, and output unit 3 exports fixed voltage information to control unit 1 by detection unit 4.

[0026] Control unit 1 uses microcontroller.

[0027] Output unit 3 includes first resistance (R1), second resistance (R2), third resistance (R3), sixth resistance (R6), seventh resistance (R7), first triode (Q1), second triode (Q2), third triode (Q3), stabilivolt (Z1) and first capacitor (C1).

[0028] Control unit 1 is connected the base of third triode (Q3) by sixth resistance (R6), and the base of third triode (Q3) is connected the emitter of third triode (Q3) by seventh resistance (R7), and the emitter of third triode (Q3) is grounded, and the collector of third triode (Q3) is connected the base of first triode (Q1) by second resistance (R2), and the base of first triode (Q1) is connected the emitter of first triode (Q1) by first resistance (R1), and the emitter of first triode (Q1) is connected power supply unit 2, and the collector of first triode (Q1) is connected the collector of second triode (Q2), and the collector of second triode (Q2) is connected the base of second triode (Q2) by third resistance (R3), and the base of second triode (Q2) is connected the cathode of stabilivolt (Z1), and the anode of stabilivolt (Z1) is grounded, and the emitter of second triode (Q2) is the output end of output unit 3, and the output end of output unit 3 is grounded by first capacitor (C1).

[0029] Detection unit 4 includes fourth resistance (R4), fifth resistance (R5) and second capacitor (C2).

[0030] The output end of the output unit 3 is connected with the fifth resistor (R5) through the fourth resistor (R4), the other end of the fifth resistor (R5) is grounded, the middle node of the fourth resistor (R4) and the fifth resistor (R5) is connected with the input end of the control unit 1, and the input end of the control unit 1 is connected with the ground through the second capacitor (C2).

[0031] The utility model discloses a kind of fixed voltage output circuits.

[0032] The utility model discloses a kind of fixed voltage output circuits including control unit 1, power supply unit 2, output unit 3 and detection unit 4, wherein control unit 1 uses microcontroller (MCU), for the start work of control circuit, simultaneously detect the fixed voltage of the utility model circuit output, when fixed voltage is abnormal, control unit 1 controls circuit to stop output to protect the safety of circuit.The utility model detects the fixed voltage of output, when fixed voltage is abnormal, circuit is turned off, improve the safety of circuit.The specific model of microcontroller in the utility model is Texas Instruments MSP430.

[0033] Power supply unit 2 is the power supply of car, the power supply of car can change in driving process, influence the normal work of car device, the purpose of the utility model is to add a circuit that can stabilize voltage output between the power supply of car and the car device of power consumption, to ensure the normal work of car device, the power supply unit 2 of the utility model outputs 16V power when starting work.

[0034] The output unit 3 is used for outputting a fixed voltage, and the output unit 3 comprises a first resistor (R1), a second resistor (R2), a third resistor (R3), a sixth resistor (R6), a seventh resistor (R7), a first transistor (Q1), a second transistor (Q2), a third transistor (Q3), a voltage stabilizing tube (Z1) and a first capacitor (C1), the control unit 1 controls the third transistor (Q3) to be turned on, due to the voltage division of the first resistor (R1) and the second resistor (R2), and then the first transistor (Q1) is turned on; the third resistor (R3) makes the base and the emitter of the second transistor (Q2) have a voltage difference, and then the second transistor (Q2) is turned on. The voltage stabilizing tube (Z1) makes the voltage stable at a stable voltage, and the fixed voltage output in the utility model is the stable voltage minus 0.7V. The first transistor (Q1) is a PNP type transistor, the second transistor (Q2) is an NPN type transistor, and the third transistor (Q3) is an NPN type transistor. The packaging size of the first resistor (R1) is 0603, the resistance value of the second resistor (R2) is 10kΩ, the packaging size of the third resistor (R3) is 0805, the resistance value of the sixth resistor (R6) is 10kΩ, the resistance value of the seventh resistor (R7) is 47kΩ, the packaging size of the first capacitor (C1) is 0603, and the model of the voltage stabilizing tube (Z1) is 1N5925B. The first capacitor (C1) plays a filtering role.

[0035] The detection unit 4 is used for transmitting voltage information of the fixed voltage to the control unit 1, and the detection unit 4 comprises a fourth resistor (R4), a fifth resistor (R5) and a second capacitor (C2). The control module determines the voltage value of the fixed voltage by inputting the voltage and the resistance values of the fourth resistor (R4) and the fifth resistor (R5). In the embodiment of the utility model, the fourth resistor (R4) and the fifth resistor (R5) are both resistors with a resistance value of 10kΩ, so that the control module can obtain the voltage value of the fixed voltage as twice the detected voltage value. The second capacitor (C2) plays a filtering role.

[0036] The circuit connection relationship of the utility model is described in detail below.

[0037] The control unit 1 connects the base of the third triode (Q3) through the sixth resistor (R6), the base of the third triode (Q3) connects the emitter of the third triode (Q3) through the seventh resistor (R7), the emitter of the third triode (Q3) is grounded, the collector of the third triode (Q3) connects the base of the first triode (Q1) through the second resistor (R2), the base of the first triode (Q1) connects the emitter of the first triode (Q1) through the first resistor (R1), the emitter of the first triode (Q1) connects the power supply unit 2, the collector of the first triode (Q1) connects the collector of the second triode (Q2), the collector of the second triode (Q2) connects the base of the second triode (Q2) through the third resistor (R3), the base of the second triode (Q2) connects the cathode of the voltage stabilizing tube (Z1), the anode of the voltage stabilizing tube (Z1) is grounded, the emitter of the second triode (Q2) is the output end of the output unit 3, and the output end of the output unit 3 is grounded through the first capacitor (C1). The output end of the output unit 3 connects the fifth resistor (R5) through the fourth resistor (R4), the other end of the fifth resistor (R5) is grounded, the middle node of the fourth resistor (R4) and the fifth resistor (R5) connects the input end of the control unit 1, and the input end of the control unit 1 is grounded through the second capacitor (C2).

[0038] The working principle of the utility model is described as follows: after the circuit starts working, the control unit 1 outputs a high level, controls the third triode (Q3) to be turned on, the first triode (Q1) is turned on subsequently due to the voltage division of the first resistor (R1) and the second resistor (R2), the third resistor (R3) makes the base and the emitter of the second triode (Q2) have a voltage difference, and the second triode (Q2) is turned on. The utility model utilizes the voltage stabilizing tube (Z1) to stabilize the voltage at a stable voltage, and the output fixed voltage is the stable voltage minus 0.7V. The control unit 1 can determine the fixed voltage output by the output unit 3 by detecting the voltage between the fourth resistor (R4) and the fifth resistor (R5) and combining the resistance values of the fourth resistor (R4) and the fifth resistor (R5). When the control unit 1 detects that the fixed voltage exceeds the expected range, the control unit 1 controls the circuit to stop working. The expected range of the fixed voltage in the utility model embodiment is 9.6V±5%. As shown in the figure, when the voltage (yellow) of the power supply unit 2 fluctuates and gradually decreases from 16V to 11V, the fixed voltage (green) output by the output unit 3 is always stabilized at 9.6V. Figure 3

[0039] The utility model provides a kind of fixed voltage circuit, which guarantees the stability of voltage output, meets the demand of stable voltage for automobile device.

[0040] ​The utility model has been described exemplarily above in combination with the drawings. Apparently, the utility model is not limited by the above-mentioned mode in the specific implementation. As long as various non-essential improvements are made by adopting the concept and technical scheme of the utility model; or the above-mentioned concept and technical scheme of the utility model are directly applied to other occasions without improvement, all are within the protection scope of the utility model.

Claims

1. A fixed voltage output circuit, characterized by: The application relates to a power supply device, which comprises a control unit, a power supply unit, an output unit and a detection unit, wherein the output end of the control unit is connected with the input end of the output unit, the output end of the power supply unit is connected with the input end of the output unit, the output end of the output unit is connected with the input end of the detection unit, and the output end of the detection unit is connected with the input end of the control unit.

2. A fixed voltage output circuit as claimed in claim 1, characterized in that: The control unit outputs a control signal to the output unit, the power supply unit outputs power to the output unit, and the output unit outputs fixed voltage information to the control unit through the detection unit.

3. A regulated voltage output circuit as claimed in claim 1, characterized in that: The control unit is a microcontroller.

4. A regulated voltage output circuit as claimed in claim 1, characterized in that: The output unit comprises a first resistor, a second resistor, a third resistor, a sixth resistor, a seventh resistor, a first triode, a second triode, a third triode, a voltage stabilizing tube and a first capacitor.

5. A regulated voltage output circuit as claimed in claim 1 or 4, characterized in that: The base of the third triode is connected with the sixth resistor, the emitter of the third triode is grounded, the collector of the third triode is connected with the base of the first triode through the second resistor, the base of the first triode is connected with the emitter of the first triode through the first resistor, the emitter of the first triode is connected with the power supply unit, the collector of the first triode is connected with the collector of the second triode, the collector of the second triode is connected with the base of the second triode through the third resistor, the base of the second triode is connected with the cathode of the voltage stabilizing tube, the anode of the voltage stabilizing tube is grounded, the emitter of the second triode is the output end of the output unit, and the output end of the output unit is grounded through the first capacitor.

6. A regulated voltage output circuit as claimed in claim 1, characterized in that: The detection unit comprises a fourth resistor, a fifth resistor and a second capacitor.

7. A regulated voltage output circuit as claimed in claim 1 or 6, characterized in that: The output end of the output unit is connected with the fifth resistor through the fourth resistor, the other end of the fifth resistor is grounded, the middle node of the fourth resistor and the fifth resistor is connected with the input end of the control unit, and the input end of the control unit is grounded through the second capacitor.

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