Wide-range voltage input and low-sleep current power supply circuit, device and control method

Abstract

The invention discloses a wide-range voltage input and low-sleep-current power supply circuit and device and a control method, and the circuit comprises a power supply input end, a power supply output end, a first voltage output adjustment unit, and a second voltage output adjustment unit. The power supply input end is electrically connected with the input end of the first voltage output adjusting unit and the input end of the second voltage output adjusting unit, the output end of the first voltage output adjusting unit and the output end of the second voltage output adjusting unit are electrically connected with the power supply output end, and the power supply input end provides power supply voltage. The first voltage output adjusting unit is configured to convert a power supply voltage into a first voltage and transmit the first voltage to the power supply output end when the power supply circuit is in a wide-range voltage input state. The second voltage output adjusting unit is configured to convert the power supply voltage into a second voltage and transmit the second voltage to the power supply output end when the power supply circuit is in a low dormant state; the circuit designed by the scheme can simultaneously meet the requirements of wide-range voltage input and low sleep current power supply output.

Description

Technical Field

[0001] The present application relates to the technical field of power supply circuits, and in particular to a wide-range voltage input, low sleep current power supply circuit, device and control method. Background Art

[0002] At present, the power supply circuits of many products cannot simultaneously achieve a wide range of voltage input and maintain a low sleep current power supply output. For example, for the 5V power supply of some products, if you want to achieve compatibility with 12V and 24V power supply systems and meet the low sleep current, you need to add a dedicated power chip or use optional components to perform compatible switching, which will greatly increase the product cost. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of this application is to provide a wide range voltage input, low sleep current power supply circuit, device and control method, so as to solve the above technical problems.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] In a first aspect, the present application provides a wide-range voltage input and low sleep current power supply circuit, the power supply circuit comprising a power supply input terminal, a power supply output terminal, a first voltage output adjustment unit and a second voltage output adjustment unit, wherein:

[0006] The first voltage output regulating unit and the second voltage output regulating unit are connected in parallel, the power supply input terminal is electrically connected to the input terminal of the first voltage output regulating unit and the input terminal of the second voltage output regulating unit, and the output terminal of the first voltage output regulating unit and the output terminal of the second voltage output regulating unit are electrically connected to the power supply output terminal,

[0007] The power supply input terminal provides a power supply voltage, and the first voltage output adjustment unit is configured to convert the power supply voltage into a first voltage and transmit it to the power supply output terminal when the power supply circuit is in a wide range voltage input state;

[0008] The second voltage output regulating unit is configured to convert the supply voltage into a second voltage and transmit the second voltage to the supply output terminal when the power supply circuit is in a low sleep state.

[0009] Furthermore, the first voltage output regulating unit includes a first output voltage adjustable chip, the first output voltage adjustable chip includes an enable pin, the enable pin is electrically connected to a signal source input, and the signal source input is sent to the enable pin to control the start and stop of the first output voltage adjustable chip.

[0010] Furthermore, the first output voltage adjustable chip includes a first input pin and a first output pin, the first input pin is electrically connected to the power supply input end, and the first output pin is electrically connected to the power supply output end.

[0011] Furthermore, a first output voltage regulating module is provided on the circuit connecting the first output pin of the first output voltage adjustable chip and the power supply output end, and the first output voltage regulating module includes a first resistor and a second resistor, wherein the first end of the first resistor is electrically connected to the power supply output end, the second end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the second resistor is electrically connected to the first ground end.

[0012] Furthermore, a first transistor is provided on a circuit connecting the first output pin of the first output voltage adjustable chip and the power supply output end, and the first transistor is used to block voltage backflow from the power supply output end.

[0013] Furthermore, the second voltage output regulating unit includes a second output voltage adjustable chip, the second output voltage adjustable chip includes a second input pin and a second output pin, the second input pin is electrically connected to the power supply input end, and the second output pin is electrically connected to the power supply output end.

[0014] Furthermore, a second output voltage regulating module is provided on the circuit connecting the second output pin of the second output voltage adjustable chip to the power supply output terminal, and the second output voltage regulating module includes a third resistor and a fourth resistor, wherein the first end of the third resistor is electrically connected to the power supply output terminal, the second end of the third resistor is electrically connected to the first end of the fourth resistor, and the second end of the fourth resistor is electrically connected to the second ground terminal.

[0015] Furthermore, a second transistor is provided on the circuit connecting the second output pin of the second output voltage adjustable chip and the power supply output end, and the second transistor is used to block the voltage backflow of the power supply output end.

[0016] In a second aspect, the present application provides a power supply device, comprising a wide-range voltage input and low sleep current power supply circuit as described in any one of claims 1-8.

[0017] In a third aspect, the present application provides a wide range voltage input, low sleep current power supply circuit control method, the control method includes a wide range voltage input stage and a low sleep stage, wherein:

[0018] The wide range voltage input stage comprises the following steps:

[0019] Sending a high level signal to the first voltage output regulating unit based on the signal source input terminal to turn on the first voltage output regulating unit,

[0020] Based on the power supply input terminal inputting voltages to the first voltage output regulating unit and the second voltage output regulating unit at the same time, the first voltage outputted by the first voltage output regulating unit is higher than the second voltage outputted by the second voltage output regulating unit, and the power supply output terminal outputs the first voltage for power supply;

[0021] The low sleep stage includes the following steps:

[0022] Sending a low level signal to the first voltage output regulating unit based on the signal source input terminal to turn off the first voltage output regulating unit,

[0023] Based on the power supply input terminal inputting a voltage to the second voltage output regulating unit, the second voltage output regulating unit outputs a second voltage to the power supply output terminal to meet the low sleep current requirement.

[0024] Beneficial Effects

[0025] The scheme designs a wide-range voltage input, low sleep current power supply circuit, device and control method, which realizes the requirements of wide-range voltage input and low sleep current voltage output by using a DCDC switching power supply and a low voltage dropout linear regulator LDO in parallel. Since both DCDC and LDO have a wide range of voltage input, the power supply circuit designed in this scheme can be compatible with systems with different voltages at the same time to complete the power supply output. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure. The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions and are only intended to illustrate the content of the present application.

[0027] Figure 1 This is the schematic diagram of the wide-range voltage input and low sleep current power supply circuit for this application.

[0028] Figure 2 This is a structural diagram of a wide-range voltage input and low sleep current power supply circuit in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted as the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in conventional experiments.

[0030] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. In this article, "electrical connection" includes the situation where the constituent elements are connected together through an element with some electrical function. "Elements with some electrical function" are not particularly limited as long as they can transfer electrical signals between the connected constituent elements. "Elements with some electrical function" can be, for example, electrodes or wiring, or switching elements such as transistors, or other functional elements such as resistors, inductors or capacitors. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0031] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0032] As described in the background technology, the power supply circuits of many products currently cannot simultaneously achieve a wide range of voltage input and maintain a low sleep current power supply output. To address the above problems, the inventor provides a wide range of voltage input, low sleep current power supply circuit, such as Figure 1 As shown, the power supply circuit includes a power supply input terminal, a power supply output terminal, a first voltage output regulating unit and a second voltage output regulating unit. The first voltage output regulating unit and the second voltage output regulating unit are connected in parallel. The power supply input terminal is electrically connected to the input terminal of the first voltage output regulating unit and the input terminal of the second voltage output regulating unit. The output terminal of the first voltage output regulating unit and the output terminal of the second voltage output regulating unit are electrically connected to the power supply output terminal. The power supply input terminal provides a power supply voltage. The first voltage output regulating unit is configured to convert the power supply voltage into a first voltage and transmit it to the power supply output terminal when the power supply circuit is in a wide range voltage input state. The second voltage output regulating unit is configured to convert the power supply voltage into a second voltage and transmit it to the power supply output terminal when the power supply circuit is in a low sleep state.

[0033] The inventors also provide a wide range voltage input, low sleep current power supply circuit control method, the control method includes a wide range voltage input stage and a low sleep stage, wherein:

[0034] The wide range voltage input stage includes the following steps:

[0035] Sending a high level signal to the first voltage output regulating unit based on the signal source input terminal to turn on the first voltage output regulating unit,

[0036] Based on the power supply input terminal inputting voltages to the first voltage output regulating unit and the second voltage output regulating unit at the same time, the first voltage outputted by the first voltage output regulating unit is higher than the second voltage outputted by the second voltage output regulating unit, and the power supply output terminal outputs the first voltage for power supply;

[0037] The low sleep phase includes the following steps:

[0038] Sending a low level signal to the first voltage output regulating unit based on the signal source input terminal to turn off the first voltage output regulating unit,

[0039] Based on the power supply input terminal inputting a voltage to the second voltage output regulating unit, the second voltage output regulating unit outputs a second voltage to the power supply output terminal to meet the low sleep current requirement.

[0040] Next, combine the attached Figure 2 The present application is described exemplarily.

[0041] An embodiment of the present application provides a wide-range voltage input and low sleep current power supply circuit, the circuit comprising:

[0042] Power supply input terminal (KL30), used for power supply input voltage,

[0043] The signal source input terminal (GPIO) is the output signal of the microcontroller IO port. It can output high or low level signals to control the start and stop of DCDC.

[0044] The first output voltage adjustable chip U1 is a voltage adjustable DCDC switching power supply.

[0045] The second output voltage adjustable chip U2 is a voltage adjustable LDO low voltage drop linear regulator.

[0046] Power supply output terminal (VBAT-5V), output 5V voltage for power supply,

[0047] The first output voltage adjustable chip U1 includes an enable pin EN1, EN1 is electrically connected to GPIO, when GPIO sends a high level signal, U1 is turned on, when GPIO sends a low level signal, U1 is turned off; U1 also includes a first input pin VI N, VI N is electrically connected to KL30, and is used for voltage input;

[0048] U1 further includes a first output pin SW, SW is electrically connected to VBAT-5V, and a voltage-dividing resistor is provided on the circuit connecting SW and VBAT-5V: a first resistor R1 and a second resistor R2, wherein a first end of R1 is electrically connected to VBAT-5V, a second end of R1 is electrically connected to a first end of R2, and a second end of R2 is electrically connected to a first ground terminal GND1, R1 and R2 are adjusting resistors for the output voltage of U1, in some embodiments, R1 is a 0402 package 420K resistor (a conventional resistance of 200K+220K can be used in series), and R2 is a 0402 package 100K resistor, which is adjusted to make the DCDC output a 5V voltage;

[0049] A Schottky diode D1 is also provided in the circuit connecting SW and VBAT-5V to prevent voltage backflow when U1 and U2 are connected in parallel. At the same time, due to the existence of the D1 diode, there is a certain voltage drop in the output voltage, so it can be adjusted according to the back-end working voltage range.

[0050] The second output voltage adjustable chip U2 includes an enable pin EN2, a second input pin IN and a second output pin OUT. EN2 and IN are electrically connected to KL30 for voltage input and controlling the start and stop of U2. Pin OUT is electrically connected to VBAT-5V. A voltage divider resistor is provided on the circuit connecting OUT and VBAT-5V: a third resistor R3 and a fourth resistor R4, wherein a first end of R3 is electrically connected to VBAT-5V, a second end of R3 is electrically connected to a first end of R4, and a second end of R4 is electrically connected to a second ground terminal GND2. R3 and R4 are regulating resistors for the output voltage of U2. In some embodiments, R3 and R4 are regulating resistors for the output voltage of LDO. Currently, R3 is a 0402 package 327K (can be connected in series with a conventional resistance value of 300K+27K), and R4 is a 0402 package 100K resistor, which is adjusted to make the LDO output 5V voltage.

[0051] A Schottky diode D2 is also provided in the circuit connecting OUT and VBAT-5V to prevent voltage backflow when U1 and U2 are connected in parallel. At the same time, due to the existence of the D2 diode, there is a certain voltage drop in the output voltage, so it can be adjusted according to the back-end operating voltage range.

[0052] When U1 and U2 are connected in parallel, because both U1 and U2 are adjustable power supplies, the output voltage can be adjusted through their voltage output adjustment resistors R1, R2, R3, and R4 respectively. Since in circuit science, the power supplies connected in parallel share the same voltage node when using high and low voltages in parallel, the output voltage is equal to the higher voltage. When power supplies of different voltages are connected in parallel, the output voltage will be equal to the highest voltage in the parallel power supplies, so the output voltage of U1 needs to be adjusted to be greater than the output voltage of U2. At this time, because U1 is a DCDC switching power supply, it is in a constant power state when working. Compared with U2 low voltage difference linear regulator, there will be no serious heating when high voltage input and high power output, so a wide range of voltage input and 5V high power output can be achieved.

[0053] When the product is going to sleep and needs to meet the low sleep current requirement, since DCDC still has a considerable static current even in the no-load state, it is necessary to use the IO port of the back-end microcontroller to control the enable pin of U1 and adjust U1-DCDC to the sleep state synchronously. Since there is no voltage output after DCDC enters the sleep state, U2-LDO will continue to supply power to the back-end system in the sleep state to ensure that some functions such as system wake-up can operate normally. Since the LDO low-voltage difference linear regulator itself has almost no static current, it can achieve the low sleep current requirement.

[0054] An embodiment of the present application provides a power supply device, which includes the power supply circuit structure in the above embodiment.

[0055] An embodiment of the present application further provides a wide-range voltage input, low sleep current power supply circuit control method, the control method includes a wide-range voltage input stage and a low sleep stage, wherein:

[0056] The wide range voltage input stage includes the following steps:

[0057] Based on GPIO, a high level signal is sent to EN1 of U1 to turn on U1.

[0058] Because KL30 simultaneously inputs voltages to VIN of U1, IN and EN2 of U2, a first voltage outputted by U1 is higher than a second voltage outputted by U2, and the output voltage of U1 is transmitted to VBAT-5V.

[0059] The low sleep phase includes the following steps:

[0060] Based on GPIO, send a low level signal to EN1 of U1 to turn U1 off.

[0061] Based on the EN2 and IN input voltages from KL30 to U2, U2 is turned on and the U2 output voltage is transmitted to the power supply output to meet the low sleep current requirement.

[0062] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A wide range voltage input, low sleep current power supply circuit, characterized in that: It includes a power supply input terminal, a power supply output terminal, a first voltage output adjustment unit and a second voltage output adjustment unit, wherein: The first voltage output regulating unit and the second voltage output regulating unit are connected in parallel, the power supply input terminal is electrically connected to the input terminal of the first voltage output regulating unit and the input terminal of the second voltage output regulating unit, and the output terminal of the first voltage output regulating unit and the output terminal of the second voltage output regulating unit are electrically connected to the power supply output terminal, The power supply input terminal provides a power supply voltage, and the first voltage output adjustment unit is configured to convert the power supply voltage into a first voltage and transmit it to the power supply output terminal when the power supply circuit is in a wide range voltage input state; The second voltage output regulating unit is configured to convert the supply voltage into a second voltage and transmit the second voltage to the supply output terminal when the power supply circuit is in a low sleep state.

2. The wide-range voltage input and low sleep current power supply circuit according to claim 1, characterized in that: The first voltage output regulating unit includes a first output voltage adjustable chip, the first output voltage adjustable chip includes an enable pin, the enable pin is electrically connected to a signal source input end, and the signal source input end is sent to the enable pin to control the start and stop of the first output voltage adjustable chip.

3. The wide-range voltage input and low sleep current power supply circuit as claimed in claim 2, characterized in that: The first output voltage adjustable chip includes a first input pin and a first output pin, the first input pin is electrically connected to the power supply input end, and the first output pin is electrically connected to the power supply output end.

4. The wide-range voltage input and low sleep current power supply circuit as claimed in claim 3, characterized in that: A first output voltage regulating module is provided on the circuit connecting the first output pin of the first output voltage adjustable chip and the power supply output end, and the first output voltage regulating module includes a first resistor and a second resistor, wherein the first end of the first resistor is electrically connected to the power supply output end, the second end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the second resistor is electrically connected to the first ground end.

5. The wide-range voltage input and low sleep current power supply circuit as claimed in claim 4, characterized in that: A first transistor is provided on the circuit connecting the first output pin of the first output voltage adjustable chip and the power supply output end, and the first transistor is used to block the voltage backflow of the power supply output end.

6. The wide-range voltage input and low sleep current power supply circuit according to claim 1, characterized in that: The second voltage output regulating unit includes a second output voltage adjustable chip, the second output voltage adjustable chip includes a second input pin and a second output pin, the second input pin is electrically connected to the power supply input end, and the second output pin is electrically connected to the power supply output end.

7. The wide-range voltage input and low sleep current power supply circuit according to claim 6, characterized in that: A second output voltage regulating module is provided on the circuit connecting the second output pin of the second output voltage adjustable chip and the power supply output end, and the second output voltage regulating module includes a third resistor and a fourth resistor, wherein the first end of the third resistor is electrically connected to the power supply output end, the second end of the third resistor is electrically connected to the first end of the fourth resistor, and the second end of the fourth resistor is electrically connected to the second ground end.

8. The wide-range voltage input and low sleep current power supply circuit as claimed in claim 7, characterized in that: A second transistor is provided on the circuit connecting the second output pin of the second output voltage adjustable chip and the power supply output end, and the second transistor is used to block the voltage backflow of the power supply output end.

9. A power supply device, characterized in that: The power supply device comprises a wide-range voltage input and low sleep current power supply circuit according to any one of claims 1 to 8.

10. A method for controlling a power supply circuit with a wide voltage input range and a low sleep current, characterized in that: The control method includes a wide range voltage input stage and a low sleep stage, wherein: The wide range voltage input stage comprises the following steps: Sending a high level signal to the first voltage output regulating unit based on the signal source input terminal to turn on the first voltage output regulating unit, Based on the power supply input terminal inputting voltages to the first voltage output regulating unit and the second voltage output regulating unit at the same time, the first voltage outputted by the first voltage output regulating unit is higher than the second voltage outputted by the second voltage output regulating unit, and the power supply output terminal outputs the first voltage for power supply; The low sleep stage includes the following steps: Sending a low level signal to the first voltage output regulating unit based on the signal source input terminal to turn off the first voltage output regulating unit, Based on the power supply input terminal inputting a voltage to the second voltage output regulating unit, the second voltage output regulating unit outputs a second voltage to the power supply output terminal to meet the low sleep current requirement.

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