CN219938184U - Automatic switching circuit for output voltage - Google Patents
Automatic switching circuit for output voltage Download PDFInfo
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- CN219938184U CN219938184U CN202320875666.6U CN202320875666U CN219938184U CN 219938184 U CN219938184 U CN 219938184U CN 202320875666 U CN202320875666 U CN 202320875666U CN 219938184 U CN219938184 U CN 219938184U
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- 238000012544 monitoring process Methods 0.000 claims abstract description 7
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- 239000003990 capacitor Substances 0.000 claims description 38
- 101001074602 Homo sapiens Protein PIMREG Proteins 0.000 claims description 11
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- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
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Abstract
The utility model discloses an automatic switching circuit of output voltage, which comprises a power input unit for inputting power supply filtering, a step-down control unit for converting an input high-voltage power supply into a required low-voltage power supply, a feedback control unit for monitoring and outputting constant voltage and current and automatically switching the magnitude of the output voltage, and an output voltage stabilizing unit for outputting stable working voltage, wherein a signal output end of the power input unit is electrically connected with a signal input end of the step-down control unit, a signal output end of the step-down control unit is electrically connected with a signal input end of the feedback control unit, and a signal output end of the feedback control unit is electrically connected with a signal input end of the output voltage stabilizing unit. The utility model has the characteristics of low standby power consumption, high efficiency, low ripple, excellent bus voltage regulation rate, load regulation rate and the like, and when the voltage input by the switching regulated power supply is changed within the range of 8-120V, the output voltage is adjustable from 5V to 30V.
Description
Technical Field
The utility model relates to the technical field of voltage conversion, in particular to an automatic switching circuit for output voltage.
Background
The forklift is an indispensable part of an enterprise logistics system as an important tool for mechanical transportation, has very wide application in places such as warehouses, distribution centers, ports, stations, airports and the like, and is an indispensable device in the enterprise logistics system. Along with popularization of forklift application, the types of forklifts are more and more diversified, the power supply system of the forklifts is generally between 12V and 80V, and if a control terminal with larger power consumption is required to be suitable for various vehicle types, the control terminal is required to be matched with the requirement of wide-voltage power supply input, and the requirements of energy consumption reduction and cost saving can be met only by high power supply conversion efficiency. In a general wide-voltage DC-DC conversion circuit, if the output power consumption is large, the power conversion efficiency is lowered if the power supply voltage is converted from 80V to low voltage 10V.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present utility model is to provide an automatic switching circuit for output voltage, which controls and outputs corresponding voltage when detecting that the input voltage is different through a single chip microcomputer, so as to improve the power supply use conversion rate, further reduce the energy consumption and save the cost.
The utility model provides an automatic switching circuit of output voltage, which comprises a power input unit for inputting power supply filtering, a step-down control unit for converting an input high-voltage power supply into a required low-voltage power supply, a feedback control unit for monitoring and outputting constant voltage and current and automatically switching the magnitude of the output voltage, and an output voltage stabilizing unit for outputting stable working voltage, wherein a signal output end of the power input unit is electrically connected with a signal input end of the step-down control unit, a signal output end of the step-down control unit is electrically connected with a signal input end of the feedback control unit, and a signal output end of the feedback control unit is electrically connected with a signal input end of the output voltage stabilizing unit.
Preferably, the power input unit includes a capacitor CE1 and a capacitor C1, where the capacitor CE1 and the capacitor C1 are connected in parallel to form the power input unit, one side of the power input unit is connected to a positive power supply electrode, and the other side of the power input unit is grounded.
Preferably, the step-down control unit includes an OC5806L chip, a resistor RCS1, a resistor R1, a capacitor C2, a capacitor C3 and a voltage regulator ZD1, one end of the resistor R1 is connected with the positive electrode of the filtered power supply, the other end of the resistor R1 is connected with the VDD pin of the OC5806L chip, the capacitor C2 and the voltage regulator ZD1 are connected in parallel to form a first circuit, one end of the first circuit, which is close to the negative electrode of the voltage regulator ZD1, is connected with the VDD pin of the OC5806L chip, the other end of the first circuit is connected with the GND pin of the OC5806L chip, one end of the capacitor C3 is connected with the VCC pin of the OC5806L chip, the other end of the capacitor C3 is connected with the GND pin of the OC5806L chip, one end of the resistor RCS1 is respectively connected with the end VSEN pin and the VSEN pin of the OC5806L chip, and the other end of the resistor RCS1 is connected with the GND pin of the OC5806L chip.
Preferably, the feedback control unit includes a diode D1, a voltage stabilizing tube ZD1, 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 dual-channel optocoupler U2 and a singlechip gpio_05, wherein the anode of the diode D1 is connected with the power output end, the cathode of the diode D1 is connected with the cathode of the voltage stabilizing tube ZD1, the diode D1 is connected with an inductance L1 through the voltage stabilizing tube ZD1, one end of the resistor R2 is connected with an FB1 pin of an OC5806L chip, the other end of the resistor R2 is connected with a GND pin of the OC5806L chip, the other end of the resistor R3 is connected with a power output end, one end of the resistor R4 is connected with an FB2 pin of the OC5806L chip, the other end of the resistor R4 is connected with a GND pin of the OC5806L chip, the diode D1 is connected with a first pin of the OC5806L chip, the other end of the resistor R2 is connected with a first pin of the OC5806L chip, the resistor R2 is connected with a fifth pin of the resistor R3, and the other end of the resistor R2 is connected with the other end of the resistor R5806L chip, and the resistor R3 is connected with the other end of the resistor R3.
Preferably, the output voltage stabilizing unit comprises a diode D2, an inductor L1, a capacitor CE2, a capacitor C4 and a resistor R10, wherein the positive electrode of the diode D2 is grounded, the negative electrode of the diode D2 is respectively connected with a VSEND pin and a VSEN pin of the OC5806L chip, one end of the inductor L1 is respectively connected with the VSEND pin and the VSEN pin of the OC5806L chip through a resistor RCS1, the other end of the inductor L1 is connected to a power output end, the capacitor CE2, the capacitor C4 and the resistor R10 are connected in parallel to form a second circuit, one end of the second circuit is connected to the power output end, and the other end of the second circuit is grounded.
The beneficial effects of the utility model are as follows: the high-voltage-stabilizing power supply has the characteristics of low standby power consumption, high efficiency, low ripple, excellent bus voltage regulation rate, load regulation rate and the like, when the voltage input by the switching stabilized power supply is changed within the range of 8-120V, the output voltage is adjustable from 5V to 30V, good output voltage stabilizing effect can be achieved, high-current output is supported, the output current can be up to more than 1.8A, and the corresponding voltage can be controlled to be output when the input voltage is detected to be different through the singlechip, so that the power supply use conversion rate is improved, the energy consumption is further reduced, and the cost is saved.
Drawings
In the drawings:
FIG. 1 is a system block diagram of an automatic switching circuit for output voltage according to the present utility model;
fig. 2 is a schematic diagram of an automatic switching circuit for output voltage according to the present utility model.
Detailed Description
Referring to fig. 1-2, an output voltage automatic switching circuit includes a power input unit for inputting power filtering, a step-down control unit for converting an input high voltage power into a required low voltage power, a feedback control unit for monitoring output constant voltage and current and automatically switching the magnitude of the output voltage, and an output voltage stabilizing unit for outputting stable operating voltage, wherein a signal output end of the power input unit is electrically connected with a signal input end of the step-down control unit, a signal output end of the step-down control unit is electrically connected with a signal input end of the feedback control unit, and a signal output end of the feedback control unit is electrically connected with a signal input end of the output voltage stabilizing unit.
The power input unit comprises a capacitor CE1 and a capacitor C1, the capacitor CE1 and the capacitor C1 are connected in parallel to form the power input unit, one side of the power input unit is connected with the positive electrode of the power supply, and the other side of the power input unit is grounded.
The voltage reduction control unit comprises an OC5806L chip, a resistor RCS1, a resistor R1, a capacitor C2, a capacitor C3 and a voltage stabilizing tube ZD1, wherein one end of the resistor R1 is connected with the positive electrode of a filtered power supply, the other end of the resistor R1 is connected with the VDD pin of the OC5806L chip, the capacitor C2 and the voltage stabilizing tube ZD1 are connected in parallel to form a first circuit, one end of the first circuit, which is close to the negative electrode of the voltage stabilizing tube ZD1, is connected with the VDD pin of the OC5806L chip, the other end of the first circuit is connected with the GND pin of the OC5806L chip, one end of the capacitor C3 is connected with the VCC pin of the OC5806L chip, the other end of the capacitor C3 is connected with the GND pin and the VSEN pin of the OC5806L chip, and the other end of the resistor RCS1 is connected with the GND pin of the OC5806L chip.
The feedback control unit comprises a diode D1, a voltage stabilizing tube ZD1, 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 dual-channel optocoupler U2 and a singlechip GPIO_05, wherein the anode of the diode D1 is connected with the output end of a power supply, the cathode of the diode D1 is connected with the cathode of the voltage stabilizing tube ZD1, the diode D1 is connected with an inductor L1 through the voltage stabilizing tube ZD1, one end of the resistor R2 is connected with the FB1 pin of an OC5806L chip, the other end of the resistor R2 is connected with the GND pin of the OC5806L chip, one end of the resistor R3 is connected with the FB1 pin of the OC5806L chip, the other end of the resistor R3 is connected with the output end of the power supply, one end of the resistor R4 is connected with the FB2 pin of the OC5806L chip, the other end of the resistor R4 is connected with the GND pin of the OC5806L chip, one end of the resistor R5 is connected with the FB2 pin of the OC5806L chip, the other end of the resistor R5 is grounded, the first pin and the fourth pin of the optocoupler U2 are respectively connected with the GPIO_05 pin of the singlechip, the first pin of the optocoupler U2 is connected to the power supply VCC_3V3 through the resistor R7, the third pin of the optocoupler U2 is connected to the power supply VCC_3V3 through the resistor R9, the fifth pin of the optocoupler U2 is connected with the GND pin of the OC5806L chip, the sixth pin of the optocoupler U2 is connected to the FB2 pin of the OC5806L chip through the resistor R8, the seventh pin of the optocoupler U2 is connected to the GND pin of the OC5806L chip, and the eighth pin of the optocoupler U2 is connected to the FB1 pin of the OC5806L chip through the resistor R6.
The output voltage stabilizing unit comprises a diode D2, an inductor L1, a capacitor CE2, a capacitor C4 and a resistor R10, wherein the positive electrode of the diode D2 is grounded, the negative electrode of the diode D2 is respectively connected with a VSEND pin and a VSEN pin of an OC5806L chip, one end of the inductor L1 is respectively connected with the VSEND pin and the VSEN pin of the OC5806L chip through a resistor RCS1, the other end of the inductor L1 is connected to a power output end, the capacitor CE2, the capacitor C4 and the resistor R10 are connected in parallel to form a second circuit, one end of the second circuit is connected to the power output end, and the other end of the second circuit is grounded.
Working principle: taking a visual monitoring terminal for use on a forklift as an example:
the voltage application range is between 9 and 36V due to the power consumption of the visual monitoring terminal being about 15 watts, and the application voltage is required to be constant. If the power input voltage is detected to be smaller than 36V, the output voltage is controlled to be 10V to supply power to the terminal; if the power input voltage is detected to be larger than 36V, the output voltage is controlled to be 30V to supply power to the terminal. This will increase the overall power conversion efficiency. The specific automatic switching working principle is as follows: the method comprises the steps that a singlechip MCU in a visual monitoring terminal detects the input voltage of a power supply by using one AD channel, if the input voltage of the power supply is detected to be smaller than 36V, an embedded program controls an input/output pin GPIO_05 of the singlechip MCU to be high level, an optocoupler U2 works in a cut-off state, the influence on an FB1 pin and an FB2 pin of an OC5806L chip is avoided, and the output voltage is controlled to be 10V to supply power to the terminal; if the power input voltage is detected to be greater than 36V, the input/output pin GPIO_05 of the MCU is controlled to be in a low level by the embedded program, the optical coupler U2 works in a conducting state, which is equivalent to connecting a resistor R6 in parallel with a resistor R2 on the FB1 pin of the OC5806L chip and connecting a resistor R8 in parallel with a resistor R4 on the FB2 pin, and the control output voltage is controlled to be 30V to supply power to the terminal.
Claims (5)
1. An automatic switching circuit of output voltage, characterized by: the power supply comprises a power supply input unit for inputting power supply filtering, a voltage reduction control unit for converting an input high-voltage power supply into a required low-voltage power supply, a feedback control unit for monitoring and outputting constant voltage and current and automatically switching the magnitude of the output voltage, and an output voltage stabilizing unit for outputting stable working voltage, wherein a signal output end of the power supply input unit is electrically connected with a signal input end of the voltage reduction control unit, a signal output end of the voltage reduction control unit is electrically connected with a signal input end of the feedback control unit, and a signal output end of the feedback control unit is electrically connected with a signal input end of the output voltage stabilizing unit.
2. An output voltage automatic switching circuit according to claim 1, wherein: the power input unit comprises a capacitor CE1 and a capacitor C1, wherein the capacitor CE1 and the capacitor C1 are connected in parallel to form the power input unit, one side of the power input unit is connected with a positive electrode of a power supply, and the other side of the power input unit is grounded.
3. An output voltage automatic switching circuit according to claim 1, wherein: the voltage reduction control unit comprises an OC5806L chip, a resistor RCS1, a resistor R1, a capacitor C2, a capacitor C3 and a voltage stabilizing tube ZD1, wherein one end of the resistor R1 is connected with the positive electrode of a filtered power supply, the other end of the resistor R1 is connected with the VDD pin of the OC5806L chip, the capacitor C2 and the voltage stabilizing tube ZD1 are connected in parallel to form a first circuit, one end of the first circuit, which is close to the negative electrode of the voltage stabilizing tube ZD1, is connected with the VDD pin of the OC5806L chip, the other end of the first circuit is connected with the GND pin of the OC5806L chip, one end of the capacitor C3 is connected with the GND pin of the OC5806L chip, one end of the resistor RCS1 is connected with the VSEND pin and the EN pin of the OC5806L chip, and the other end of the resistor RCS1 is connected with the GND pin of the OC5806L chip.
4. An output voltage automatic switching circuit according to claim 3, wherein: the feedback control unit comprises a diode D1, a voltage stabilizing tube ZD1, 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 dual-channel optocoupler U2 and a singlechip GPIO_05, wherein the positive electrode of the diode D1 is connected with the power output end, the negative electrode of the diode D1 is connected with the negative electrode of the voltage stabilizing tube ZD1, the diode D1 is connected with an inductor L1 through the voltage stabilizing tube ZD1, one end of the resistor R2 is connected with the FB1 pin of the OC5806L chip, the other end of the resistor R2 is connected with the GND pin of the OC5806L chip, one end of the resistor R3 is connected with the FB1 pin of the OC5806L chip, the other end of the resistor R3 is connected with the power output end, one end of the resistor R4 is connected with the 2 FB pin of the OC5806L chip, the other end of the resistor R4 is connected with the GND pin of the OC5806L chip, one end of the resistor R5 is connected with the FB2 pin of the OC5806L chip, the other end of the resistor R5 is grounded, the first pin and the fourth pin of the optocoupler U2 are respectively connected with the GPIO_05pin of the singlechip, the first pin of the optocoupler U2 is connected to the power VCC_3V3 through the resistor R7, the third pin of the optocoupler U2 is connected to the power VCC_3V3 through the resistor R9, the fifth pin of the optocoupler U2 is connected with the GND pin of the OC5806L chip, the sixth pin of the optocoupler U2 is connected to the FB2 pin of the OC5806L chip through the resistor R8, the seventh pin of the optocoupler U2 is connected to the GND pin of the OC5806L chip, and the eighth pin of the optocoupler U2 is connected to the FB1 pin of the OC5806L chip through the resistor R6.
5. An output voltage automatic switching circuit according to claim 3, wherein: the output voltage stabilizing unit comprises a diode D2, an inductor L1, a capacitor CE2, a capacitor C4 and a resistor R10, wherein the positive electrode of the diode D2 is grounded, the negative electrode of the diode D2 is respectively connected with a VSEND pin and a VSEN pin of the OC5806L chip, one end of the inductor L1 is respectively connected with the VSEND pin and the VSEN pin of the OC5806L chip through a resistor RCS1, the other end of the inductor L1 is connected to a power output end, the capacitor CE2, the capacitor C4 and the resistor R10 are connected in parallel to form a second circuit, one end of the second circuit is connected to the power output end, and the other end of the second circuit is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320875666.6U CN219938184U (en) | 2023-04-13 | 2023-04-13 | Automatic switching circuit for output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320875666.6U CN219938184U (en) | 2023-04-13 | 2023-04-13 | Automatic switching circuit for output voltage |
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| Publication Number | Publication Date |
|---|---|
| CN219938184U true CN219938184U (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320875666.6U Active CN219938184U (en) | 2023-04-13 | 2023-04-13 | Automatic switching circuit for output voltage |
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| CN (1) | CN219938184U (en) |
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- 2023-04-13 CN CN202320875666.6U patent/CN219938184U/en active Active
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