Power input compatible circuit and device
By designing a power input compatible circuit and using voltage stabilization filtering, voltage identification and conversion modules, the compatibility problem of computer/cloud terminal equipment for different power input voltages is solved, the power signal voltage value is unified, and the equipment reliability and user experience are improved.
Patent Information
- Application Number
- CN202411576811.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-03-18
AI Technical Summary
The prior art is difficult to achieve compatibility between computer/cloud terminal devices for different power input voltages, resulting in user error using power adapters that may cause damage to the device or fail to start normally.
A power input compatible circuit is designed, including a voltage stabilization filter module, a voltage identification module, a first voltage switching module, a second voltage switching module and a voltage conversion module. Through these modules, the input power signal is regulated, identified and converted to ensure that the voltage value of the power signal is unified.
Effectively avoid equipment damage and startup problems caused by wrong use of power adapters, and improve user experience and device availability.
Smart Images
Figure CN119652068A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of power compatibility, and in particular to a power input compatible circuit and device. Background Art
[0002] With the development of the digital information age, more and more types of computers / cloud terminals are appearing on the market. The input power solutions of computers / cloud terminals produced by different manufacturers are also different. For example, the input power solutions include but are not limited to 12V input and 19V input. For computers / cloud terminals with 12V input, if the user mistakenly uses a 19V power adapter, it is likely to cause the motherboard of the computer / cloud terminal to burn out. Conversely, the computer / cloud terminal may not be started normally.
[0003] The above problems not only easily cause equipment damage, but may also affect the user experience. Based on this, how to achieve compatible use of power adapters input to computers / cloud terminals to improve user experience and equipment reliability is one of the inevitable and important directions for the future development of computer design. Summary of the invention
[0004] In order to overcome the shortcomings of the prior art, the present application provides a power input compatible circuit and device to ensure that the voltage value of the power signal finally input to the load circuit is uniform, thereby avoiding adverse consequences caused by incorrect use of the power adapter, thereby improving user experience and device usability.
[0005] The technical solution adopted by this application to solve its technical problem is: In a first aspect, the present application provides a power input compatible circuit, including a voltage stabilizing filter module, a voltage identification module, a first voltage switch module, a second voltage switch module and a voltage conversion module; The input end of the voltage stabilization and filtering module receives an external power input signal, and the output end is connected to the input end of the voltage identification module, for performing voltage stabilization and filtering processing on the power input signal, and inputting the power signal after voltage stabilization and filtering processing into the voltage identification module; One output end of the voltage identification module is connected to the input end of the first voltage switch module, and the other output end is connected to the input end of the second voltage switch module, and is used to output the power signal to the corresponding voltage switch module according to the voltage value of the power signal; The output end of the first voltage switch module is connected to a load circuit, and is used to transmit the power signal to the load circuit if the voltage value is a first voltage; The output end of the second voltage switch module is connected to the input end of the voltage conversion module, and is used to transmit the power signal to the voltage conversion module if the voltage value is the second voltage; The voltage conversion module is connected to the load circuit, and is used for converting the voltage value of the power signal from the second voltage to the first voltage, and outputting the converted power signal to the load circuit.
[0006] Optionally, the voltage stabilization and filtering module includes a power adapter, a voltage stabilization unit, a first filtering unit, a second filtering unit, a slow start unit and a third filtering unit; The input end of the voltage stabilizing unit is connected to the output end of the power adapter, and the output end of the voltage stabilizing unit is connected to the input end of the first filtering unit, so as to perform voltage stabilization processing on the power input signal and then output it to the first filtering unit; The output end of the first filtering unit is connected to the input end of the second filtering unit, and is used to filter out high-frequency interference signals and low-frequency interference signals in the power input signal, and output the first signal obtained after filtering to the second filtering unit; The output end of the second filtering unit is connected to the input end of the slow start unit, and is used to filter out the AC interference signal in the first signal, and output the second signal obtained after filtering to the slow start unit; The output end of the slow start unit is connected to the third filter unit, and is used for slow starting the path of the second signal output to the third filter unit when the second signal changes; The output end of the third filtering unit is connected to the input end of the voltage identification module, and is used to filter out high-frequency interference signals and low-frequency interference signals in the second signal, and output the power supply signal obtained after filtering to the voltage identification module.
[0007] Optionally, the slow start unit includes an RC slow start unit, a first resistor, a second resistor, a first MOS tube and a second MOS tube; The input end of the RC slow start unit is connected to the output end of the second filter unit, the first output end of the RC slow start unit is connected to the gate of the first MOS tube, and the source of the first MOS tube is grounded; The drain of the first MOS tube is connected to one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected to the drain of the second MOS tube, the other end of the second resistor is connected to the gate of the second MOS tube, and the source of the second MOS tube is connected to the input end of the third filtering unit.
[0008] Optionally, the voltage stabilizing and filtering module further includes an isolation unit; The isolation unit includes at least one isolation device, one end of each isolation device is connected to the ground terminal of the power adapter, and the other end is connected to the ground terminal of the first filter unit.
[0009] Optionally, the voltage identification module includes an ADC chip; The input end of the ADC chip is connected to the third filtering unit, which is used to receive the power signal and place the power signal into an internal register of the ADC chip, and the internal register is used to determine the voltage value of the power signal; The first output terminal of the ADC chip is connected to the input terminal of the first voltage switch module, and is used to trigger the first voltage switch module if the voltage value is the first voltage; The second output end of the ADC chip is connected to the input end of the second voltage switch module, and is used to trigger the second voltage switch module if the voltage value is the second voltage.
[0010] Optionally, the first voltage switch module includes a third resistor, a third MOS transistor, and a fourth MOS transistor; One end of the third resistor is connected to the first output end of the ADC chip, and the other end is connected to the gate of the third MOS tube. The source of the third MOS tube is grounded, and the drain of the third MOS tube is connected to the gate of the fourth MOS tube. The source of the fourth MOS tube is connected to the output end of the third filtering unit, and the drain of the fourth MOS tube is connected to the load circuit.
[0011] Optionally, the second voltage switch module includes a fourth resistor, a fifth MOS transistor, and a sixth MOS transistor; One end of the fourth resistor is connected to the second output end of the ADC chip, and the other end is connected to the gate of the fifth MOS tube, the source of the fifth MOS tube is grounded, and the drain of the fifth MOS tube is connected to the gate of the sixth MOS tube; The source of the sixth MOS tube is connected to the output end of the third filtering unit, and the drain of the sixth MOS tube is connected to the input end of the voltage conversion module.
[0012] Optionally, the voltage conversion module includes a voltage conversion chip, a fifth resistor, a sixth resistor, and a seventh resistor; The input pin of the voltage conversion chip is connected to the drain of the sixth MOS tube, the enable pin of the voltage conversion chip is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the drain of the sixth MOS tube; The feedback pin of the voltage conversion chip is connected to one end of the sixth resistor and one end of the seventh resistor, the other end of the sixth resistor is connected to the load circuit, and the other end of the seventh resistor is grounded.
[0013] Optionally, the voltage conversion chip matches the output voltage value based on a preset feedback coefficient, the sixth resistor and the seventh resistor, and the formula used is: ; in, is the output voltage value, is the feedback coefficient, is the resistance value of the sixth resistor, is the resistance value of the seventh resistor.
[0014] In a second aspect, the present application provides a power input compatible device equipped with the above-mentioned power input compatible circuit.
[0015] The beneficial effects of the present application are as follows: for a power input signal of unknown voltage input to a device such as a computer / cloud terminal (hereinafter referred to as the target device), the power input signal is first preprocessed by a voltage stabilization filter module, and a stable power signal is obtained and then input to a voltage identification module, and the voltage identification module judges the voltage value of the power signal, and if it is determined that the voltage value of the power signal is the first voltage, the first voltage switch module is triggered, otherwise, the voltage value of the power signal is determined to be the second voltage and the second voltage switch module is triggered; when the first voltage switch module is triggered, the power signal is transmitted to the load circuit of the next level; when the second voltage switch module is triggered, the power signal is transmitted to the voltage conversion module, so that the voltage value of the power signal is adjusted to the first voltage through the voltage conversion module, and the power signal adjusted to the first voltage is transmitted to the load circuit of the next level. Based on this, it can be ensured that the voltage value of the power signal finally input to the load circuit is unified, thereby avoiding adverse consequences caused by incorrect use of the power adapter, thereby improving user experience and device availability. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a module schematic diagram of a power input compatible circuit provided in an embodiment of the present application; Figure 2 is a circuit schematic diagram of a voltage stabilizing and filtering module provided in an embodiment of the present application; Figure 3 It is a circuit schematic diagram of a slow start unit in a voltage stabilizing and filtering module provided in an embodiment of the present application; Figure 4 is a circuit schematic diagram of a voltage identification module provided in an embodiment of the present application; Figure 5 is a circuit schematic diagram of a first voltage switch module provided in an embodiment of the present application; Figure 6 It is a circuit schematic diagram of the voltage conversion module provided in an embodiment of the present application. DETAILED DESCRIPTION
[0017] The present application is further described below in conjunction with the accompanying drawings and embodiments.
[0018] The following will clearly and completely describe the concept, specific structure and technical effects of the present application in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments of the present application, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present application. In addition, all the connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features created in this application can be combined interactively without conflicting with each other.
[0019] Reference Figure 1 , Figure 1 It is a module schematic diagram of the power input compatible circuit provided in an embodiment of the present application, including a voltage stabilizing and filtering module, a voltage identification module, a first voltage switch module, a second voltage switch module and a voltage conversion module.
[0020] Regarding the voltage stabilizing and filtering module: the input end of the voltage stabilizing and filtering module receives an external power input signal, and the output end is connected to the input end of the voltage identification module, which is used to perform voltage stabilizing and filtering on the power input signal, and input the power signal after voltage stabilizing and filtering into the voltage identification module.
[0021] Specifically, the external power input signal is input by a power adapter, and its voltage value is unknown. There may be interference signals that affect subsequent judgments, and the interference signals include high-frequency interference signals, low-frequency interference signals, and AC interference signals. In order to ensure the accuracy of the subsequent voltage identification module in judging the voltage value of the power input signal, the present application proposes to first perform voltage stabilization and filtering on the power input signal before voltage identification. Specifically, refer to Figure 2 , Figure 2 : is a circuit schematic diagram of a voltage stabilizing and filtering module provided in an embodiment of the present application, including a power adapter, a voltage stabilizing unit, a first filtering unit, a second filtering unit, a slow start unit and a third filtering unit, which are specifically described below: The power adapter is used as the input of the power supply, that is, used to receive the power input signal, such as Figure 2 The device J21 shown sends a power input signal to a subsequent circuit, namely, a voltage stabilizing unit, through a VCC3 pin of J21.
[0022] Furthermore, the input end of the voltage stabilizing unit is connected to the output end of the power adapter, and the output end of the voltage stabilizing unit is connected to the input end of the first filtering unit, so as to perform voltage stabilization processing on the power input signal and then output it to the first filtering unit.
[0023] Specifically, the voltage stabilizing unit includes a voltage stabilizing tube PD1, and the device model used may be CSMBJ13A, such as Figure 2 As shown, the negative pole of the voltage regulator is connected to the VCC3 pin of the power adapter, and the positive pole is grounded, namely DC_GND. The power input signal is stabilized by utilizing the characteristics of the voltage regulator and then input to the first filtering unit of the subsequent stage.
[0024] More specifically, after the power input signal is stabilized and before it is input to the first filtering unit, a fuse F1 may be used to connect the voltage stabilizing unit and the first filtering unit in series, so as to achieve overload protection when the signal changes rapidly.
[0025] More specifically, to isolate the power adapter GND (such as Figure 2 The DC_GND shown in the figure is connected to the mainboard GND. The present application uses an isolation device for isolation. Specifically, the isolation unit includes at least one isolation device. One end of each isolation device is connected to the ground terminal of the power adapter, and the other end is connected to the ground terminal of the first filter unit. Among them, four isolation devices connected in series are used in the embodiment of the present application, such as Figure 2 The FB73 / FB55 / FB57 / FB54 shown in the figure. The above isolation process can prevent the noise introduced by the power adapter from interfering with the mainboard and protect the mainboard from voltage fluctuations.
[0026] Furthermore, the output end of the first filtering unit is connected to the input end of the second filtering unit, for filtering out high-frequency interference signals and low-frequency interference signals in the power input signal, and outputting the first signal obtained after filtering to the second filtering unit.
[0027] Specifically, the first filtering unit includes at least two groups of capacitors, such as Figure 2 As described above, a group of capacitors are high frequency filter capacitors, namely Figure 2 C403 / C404 in the system uses a 0.1uF capacitor to filter out the high-frequency part of the interference signal. Figure 2 C393 / C394 in the circuit uses 10uF to filter out the low-frequency part of the interference signal.
[0028] Furthermore, the output end of the second filtering unit is connected to the input end of the slow start unit, and is used to filter out the AC interference signal in the first signal, and output the second signal obtained after filtering to the slow start unit.
[0029] Specifically, the second filtering unit includes an inductor and a capacitor, such as Figure 2 The inductor L9 and capacitor C341 are shown. The inductor is connected in series between the first filter unit and the slow start unit. Based on the characteristics of the inductor passing DC and blocking AC, one end of the capacitor is connected to the connection between the first filter unit and the inductor, and the other end is grounded. Based on its characteristics of passing AC and blocking DC, the AC part of the first signal obtained after filtering by the first filter unit is output to the ground through the capacitor, thereby ensuring that the signal input to the slow start unit is a DC signal, and adjusting the first signal to a second signal containing only the DC part.
[0030] Furthermore, an output end of the slow-start unit is connected to the third filtering unit, and is used to slowly start a path for outputting the second signal to the third filtering unit when the second signal changes.
[0031] Specifically, the slow start unit is used to slow down the impact on components and loads caused by the sharp changes in current and voltage caused by plugging and unplugging the power adapter, thereby protecting various components of the motherboard's back-end circuit. The slow start unit uses an RC slow start unit to slowly charge the capacitor to gradually open or close the corresponding switch tube, thereby avoiding drastic changes in the signal.
[0032] More specifically, the slow start unit includes an RC slow start unit, a first resistor, a second resistor, a first MOS transistor and a second MOS transistor.
[0033] The input end of the RC slow start unit is connected to the output end of the second filter unit, the first output end of the RC slow start unit is connected to the gate of the first MOS tube, and the source of the first MOS tube is grounded.
[0034] Specifically, refer to Figure 3 , Figure 3 : is a circuit schematic diagram of a slow start unit in a voltage stabilizing filter module provided in an embodiment of the present application, wherein the RC slow start unit includes a capacitor C400 / C323 / C331 and a resistor R401 / R407. Through the combination of RC, when the second signal is transmitted to the potential point of P19V&P12V_IN, the capacitor is gradually charged, thereby gradually increasing the gate potential of the first MOS tube (i.e. Figure 3 The gate potential of Q21 in the figure is the gate potential of Q21 in the figure). Since the first MOS tube adopts NMOS, it will be turned on when the gate is pulled high; conversely, the potential of the potential point of P19V&P12V_IN decreases, and the first MOS tube is slowly turned off due to the gradual discharge of the RC slow start unit.
[0035] Further, the drain of the first MOS tube is connected to one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected to the drain of the second MOS tube, the other end of the second resistor is connected to the gate of the second MOS tube, and the source of the second MOS tube is connected to the input end of the third filtering unit.
[0036] Specifically, Figure 3 As shown, the first resistor is R404, the second resistor is R405, and the second MOS tube is a PMOS tube of Q23. When the first MOS tube Q21 is gradually turned on due to the increase of the gate potential, a potential difference is formed between the two ends of the first resistor R404 and the second resistor R405, resulting in a high-low potential difference between the pins 1 / 2 / 3 (drain) and the pin 4 (gate) of the second MOS tube Q23 and turning on. During the conduction of the second MOS tube Q23, the second signal is slowly output to the third filtering unit.
[0037] Furthermore, the output end of the third filtering unit is connected to the input end of the voltage identification module, for filtering out high-frequency interference signals and low-frequency interference signals in the second signal, and outputting the power supply signal obtained after filtering to the voltage identification module.
[0038] Specifically, the third filtering unit is similar to the first filtering unit described above, and is used to filter out high-frequency interference signals and low-frequency interference signals that may exist in the second signal after passing through the slow start unit, such as Figure 2 As shown, the capacitor C399 in the embodiment of the present application is 0.1uF, which is used to filter out low-frequency interference signals, and C405 / C409 / C316 is 10uF, which is used to filter out high-frequency interference signals.
[0039] Regarding the voltage identification module: one output end of the voltage identification module is connected to the input end of the first voltage switch module, and the other output end is connected to the input end of the second voltage switch module, and is used to output the power signal to the corresponding voltage switch module according to the voltage value of the power signal.
[0040] Specifically, refer to Figure 4 , Figure 4 The circuit schematic diagram of the voltage identification module provided by the embodiment of the present application includes an ADC detection circuit and an ADC module connection circuit, wherein the ADC detection circuit collects the voltage of the ADC3 potential, and the voltage of the ADC3 potential is determined by the power supply signal processed by the third filter module in the voltage stabilization filter module. The voltage collected by AD3 is input to the N51 pin in the ADC module connection circuit.
[0041] Furthermore, voltage identification is performed based on the collected signal, and an ADC chip can be used for calculation. Specifically, the input end of the ADC chip is connected to the third filtering unit, which is used to receive the power signal and place the power signal into an internal register of the ADC chip. The internal register is used to determine the voltage value of the power signal.
[0042] Specifically, after the signal collected by the ADC detection circuit is input into the ADC chip, the detected voltage is placed in the internal register of the chip, and the actual voltage value of the power signal is calculated internally, and the switch module corresponding to the voltage is triggered. Among them, the ADC chip models used in this application include but are not limited to E2000S, AST2500 and AST2600.
[0043] The first output end of the ADC chip is connected to the input end of the first voltage switch module, and is used to trigger the first voltage switch module if the voltage value is a first voltage.
[0044] Specifically, the first output terminal of the ADC chip is as follows: Figure 4 The J43 pin shown provides an enable signal for the first voltage switch module, which is used to trigger the first voltage switch module. In the embodiment of the present application, the first voltage is 12V and the second voltage is 19V. When the power signal is identified as 12V, the enable signal P12V_EN is sent to the first switch module.
[0045] The second output end of the ADC chip is connected to the input end of the second voltage switch module, and is used to trigger the second voltage switch module if the voltage value is the second voltage.
[0046] Specifically, the second output terminal of the ADC chip is as follows Figure 4 The G43 pin shown provides an enable signal for the second voltage switch module, and when it is recognized that the power signal is 19V, an enable signal P19V_EN is sent to the first switch module.
[0047] Regarding the first voltage switch module: the output end of the first voltage switch module is connected to the load circuit, and is used to transmit the power signal to the load circuit if the voltage value is the first voltage.
[0048] Specifically, refer to Figure 5 , Figure 5 : is a circuit schematic diagram of the first voltage switch module provided in an embodiment of the present application, which is used to open a path for transmitting the power signal to the load circuit when determining that the power signal can be directly transmitted to the load circuit of the next level, and includes a third resistor, a third MOS tube, and a fourth MOS tube, which are specifically described below: The gate of the third MOS tube is connected to the first output terminal of the ADC chip, the source of the third MOS tube is grounded, and the drain of the third MOS tube is connected to an external DC signal source and the gate of the fourth MOS tube.
[0049] Specifically, the gate of the third MOS tube is controlled by the first input terminal (P12V_EN) of the ADC chip, which is an NMOS tube. Figure 5 When the gate voltage of the third MOS tube is pulled high, Q66 is turned on so that the fourth MOS tube ( Figure 5 The gate of Q68 in is pulled low to ground.
[0050] The source of the fourth MOS tube is connected to the output end of the third filtering unit and one end of the third resistor, the other end of the third resistor is connected to the connection between the third MOS tube and the fourth MOS tube, and the drain of the fourth MOS tube is connected to the load circuit.
[0051] Specifically, since the drain of the third MOS tube and the gate of the fourth MOS tube are connected together, when the third MOS tube is turned on, the gate of the fourth MOS tube is also pulled down to 0V, thereby turning on the fourth MOS tube based on the characteristics of PMOS, so that the power supply signal is output to the load circuit of the next stage, that is, from P19V&P12V to P12V via Q68.
[0052] Regarding the second voltage switch module: the output end of the second voltage switch module is connected to the input end of the voltage conversion module, and is used to transmit the power signal to the voltage conversion module if the voltage value is the second voltage.
[0053] Specifically, the control principle of the second voltage switch module is similar to that of the first voltage switch module, which is triggered by the second voltage enable signal sent by the ADC chip, and then transmits the power signal to the voltage conversion module described below. Specifically, the second voltage switch module includes a fourth resistor, a fifth MOS tube, and a sixth MOS tube, wherein: The gate of the fifth MOS tube is connected to the second output terminal of the ADC chip, the source of the fifth MOS tube is grounded, and the drain of the fifth MOS tube is connected to an external DC signal source and the gate of the sixth MOS tube.
[0054] Specifically, after receiving P19V_EN output by the ADC chip, the fifth MOS tube Q71 pulls up the gate potential of the fifth MOS tube, thereby turning on the fifth MOS tube, and after turning on, the gate of the sixth MOS tube Q70 is grounded and pulled down.
[0055] The source of the sixth MOS tube is connected to the output end of the third filtering unit and one end of the fourth resistor, the other end of the fourth resistor is connected to the connection between the fifth MOS tube and the sixth MOS tube, and the drain of the sixth MOS tube is connected to the input end of the voltage conversion module.
[0056] Specifically, since the drain of the fifth MOS tube and the gate of the sixth MOS tube are connected together, when the fifth MOS tube is turned on, the gate of the sixth MOS tube is also pulled down to 0V, thereby turning on the sixth MOS tube based on the characteristics of PMOS, so that the power signal is output to the input end of the voltage conversion module, that is, from P19V&P12V to P19V via Q68.
[0057] Regarding the voltage conversion module: the voltage conversion module is connected to the load circuit, and is used to convert the voltage value of the power supply signal from the second voltage to the first voltage, and output the converted power supply signal to the load circuit.
[0058] Specifically, the voltage conversion module is used to convert the second voltage that does not meet the voltage requirement of the input load circuit into a suitable first voltage, referring to Figure 6 , Figure 6 It is a circuit schematic diagram of the voltage conversion module provided in an embodiment of the present application, which includes a voltage conversion chip, a fifth resistor, a sixth resistor, and a seventh resistor.
[0059] Among them, Figure 6 As shown, the voltage conversion chip U23 can use SCT2360. When the second voltage 19V is input to the VIN pin of the voltage conversion chip U23, the EN pin is also synchronously pulled high to trigger the working condition of the voltage conversion chip U23. After U23 works, the sixth resistor R1 and the seventh resistor R2 are combined to adjust the voltage value output by the VOUT pin of U23.
[0060] Specifically, the input pin of the voltage conversion chip is connected to the drain of the sixth MOS tube, the enable pin of the voltage conversion chip is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the drain of the sixth MOS tube.
[0061] When the sixth MOS tube is turned on, it indicates that the power signal is the second voltage. In this case, the power signal is output to the input pin VIN of the voltage conversion chip through the sixth MOS tube, and is output to the EN pin through the fifth resistor R406 to trigger the voltage conversion chip U23 to work.
[0062] The feedback pin of the voltage conversion chip is connected to one end of the sixth resistor and one end of the seventh resistor, the other end of the sixth resistor is connected to the load circuit, and the other end of the seventh resistor is grounded.
[0063] Specifically, the feedback pin FB of the voltage conversion chip is connected to the sixth resistor R1 and the seventh resistor R2, wherein the other end of the seventh resistor R2 is grounded, and the other end of the sixth resistor R1 is connected to the above-mentioned load circuit (output to Figure 6 P12V in the figure), based on the sixth resistor R1 and the seventh resistor R2, the voltage value of the signal output by the VOUT pin of U23 can be adjusted to the first voltage using the following formula: ; in, is the output voltage value, is the feedback coefficient, is the resistance value of the sixth resistor, is the resistance value of the seventh resistor.
[0064] In the embodiments of the present application, The voltage value is 12V, the feedback coefficient Set to 0.6, the sixth resistor The resistance value is 20K, the seventh resistor The resistance value is 1.05K, substituting it into the above formula yields: ; More specifically, the FSEL pin of the voltage conversion chip U23 receives the SCT4_FSEL signal. If the signal is connected to GND, it is 400Khz, and if it is connected to VCC, it is 1.2Mhz. In the embodiment of the present application, it is suspended and 800Khz; the MODE pin of the voltage conversion chip U23 receives the SCT4_MODE signal, which selects the working mode of U23 through different pull-up and pull-down configurations. The signal is connected to GND for pulse frequency modulation mode, connected to VCC for forced continuous current modulation mode, and suspended for PFM WITH USM (pulse frequency modulation with ultrasonic) mode. In the embodiment of the present application, the pulse frequency modulation mode is adopted; the PG pin of the voltage conversion chip U23 receives the P12V_PG signal, and the P12V_PG signal is the Power good (power supply is normal) signal, when the output voltage VOUT is higher than 95% of the rated voltage and lower than 105% of the rated voltage, the signal is high level; SCT4_EN is the enable signal of U23, which is used for the switching state of U23. When EN is high level, U23 is turned on; when EN is low level, U23 is turned off.
[0065] In a second aspect, the present application provides a power input compatible device equipped with the above-mentioned power input compatible circuit.
[0066] The above is a specific description of the preferred implementation of the present application, but the invention of the present application is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.
Claims
1. A power input compatible circuit, characterized in that: It includes a voltage stabilizing and filtering module, a voltage identifying module, a first voltage switching module, a second voltage switching module and a voltage conversion module; The input end of the voltage stabilization and filtering module receives an external power input signal, and the output end is connected to the input end of the voltage identification module, for performing voltage stabilization and filtering processing on the power input signal, and inputting the power signal after voltage stabilization and filtering processing into the voltage identification module; One output end of the voltage identification module is connected to the input end of the first voltage switch module, and the other output end is connected to the input end of the second voltage switch module, and is used to output the power signal to the corresponding voltage switch module according to the voltage value of the power signal; The output end of the first voltage switch module is connected to a load circuit, and is used to transmit the power signal to the load circuit if the voltage value is a first voltage; The output end of the second voltage switch module is connected to the input end of the voltage conversion module, and is used to transmit the power signal to the voltage conversion module if the voltage value is the second voltage; The voltage conversion module is connected to the load circuit, and is used for converting the voltage value of the power signal from the second voltage to the first voltage, and outputting the converted power signal to the load circuit.
2. The power input compatible circuit according to claim 1, characterized in that: The voltage stabilization and filtering module includes a power adapter, a voltage stabilization unit, a first filtering unit, a second filtering unit, a slow start unit and a third filtering unit; The input end of the voltage stabilizing unit is connected to the output end of the power adapter, and the output end of the voltage stabilizing unit is connected to the input end of the first filtering unit, so as to perform voltage stabilization processing on the power input signal and then output it to the first filtering unit; The output end of the first filtering unit is connected to the input end of the second filtering unit, and is used to filter out high-frequency interference signals and low-frequency interference signals in the power input signal, and output the first signal obtained after filtering to the second filtering unit; The output end of the second filtering unit is connected to the input end of the slow start unit, and is used to filter out the AC interference signal in the first signal, and output the second signal obtained after filtering to the slow start unit; The output end of the slow start unit is connected to the third filter unit, and is used for slow starting the path of the second signal output to the third filter unit when the second signal changes; The output end of the third filtering unit is connected to the input end of the voltage identification module, and is used to filter out high-frequency interference signals and low-frequency interference signals in the second signal, and output the power supply signal obtained after filtering to the voltage identification module.
3. The power input compatible circuit according to claim 2, characterized in that: The slow start unit comprises an RC slow start unit, a first resistor, a second resistor, a first MOS tube and a second MOS tube; The input end of the RC slow start unit is connected to the output end of the second filter unit, the first output end of the RC slow start unit is connected to the gate of the first MOS tube, and the source of the first MOS tube is grounded; The drain of the first MOS tube is connected to one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected to the drain of the second MOS tube, the other end of the second resistor is connected to the gate of the second MOS tube, and the source of the second MOS tube is connected to the input end of the third filtering unit.
4. The power input compatible circuit according to claim 2, characterized in that: The voltage stabilizing and filtering module also includes an isolation unit; The isolation unit includes at least one isolation device, one end of each isolation device is connected to the ground terminal of the power adapter, and the other end is connected to the ground terminal of the first filter unit.
5. The power input compatible circuit according to claim 2, characterized in that: The voltage identification module includes an ADC chip; The input end of the ADC chip is connected to the third filtering unit, which is used to receive the power signal and place the power signal into an internal register of the ADC chip, and the internal register is used to determine the voltage value of the power signal; The first output terminal of the ADC chip is connected to the input terminal of the first voltage switch module, and is used to trigger the first voltage switch module if the voltage value is the first voltage; The second output end of the ADC chip is connected to the input end of the second voltage switch module, and is used to trigger the second voltage switch module if the voltage value is the second voltage.
6. The power input compatible circuit according to claim 5, characterized in that: The first voltage switch module includes a third resistor, a third MOS tube and a fourth MOS tube; The gate of the third MOS tube is connected to the first output terminal of the ADC chip, the source of the third MOS tube is grounded, and the drain of the third MOS tube is connected to an external DC signal source and the gate of the fourth MOS tube; The source of the fourth MOS tube is connected to the output end of the third filtering unit and one end of the third resistor, the other end of the third resistor is connected to the connection between the third MOS tube and the fourth MOS tube, and the drain of the fourth MOS tube is connected to the load circuit.
7. The power input compatible circuit according to claim 5, characterized in that: The second voltage switch module includes a fourth resistor, a fifth MOS tube, and a sixth MOS tube; The gate of the fifth MOS tube is connected to the second output terminal of the ADC chip, the source of the fifth MOS tube is grounded, and the drain of the fifth MOS tube is connected to an external DC signal source and the gate of the sixth MOS tube; The source of the sixth MOS tube is connected to the output end of the third filtering unit and one end of the fourth resistor, the other end of the fourth resistor is connected to the connection between the fifth MOS tube and the sixth MOS tube, and the drain of the sixth MOS tube is connected to the input end of the voltage conversion module.
8. The power input compatible circuit according to claim 7, characterized in that: The voltage conversion module includes a voltage conversion chip, a fifth resistor, a sixth resistor, and a seventh resistor; The input pin of the voltage conversion chip is connected to the drain of the sixth MOS tube, the enable pin of the voltage conversion chip is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the drain of the sixth MOS tube; The feedback pin of the voltage conversion chip is connected to one end of the sixth resistor and one end of the seventh resistor, the other end of the sixth resistor is connected to the load circuit, and the other end of the seventh resistor is grounded.
9. The power input compatible circuit according to claim 8, characterized in that: The voltage conversion chip matches the output voltage value based on the preset feedback coefficient, the sixth resistor and the seventh resistor, and the formula used is: ； in, is the output voltage value, is the feedback coefficient, is the resistance value of the sixth resistor, is the resistance value of the seventh resistor.
10. A power input compatible device, characterized in that: The device is equipped with a power input compatible circuit as described in any one of claims 1-9.