High-voltage power conversion circuit, linear voltage regulator and electronic product

Abstract

The invention provides a high-voltage power conversion circuit, a linear voltage regulator and an electronic product, and the circuit comprises a high-voltage input level conversion unit which receives a high-voltage input power supply, generates a low-voltage output power supply when the high-voltage input power supply is larger than a set voltage, and is turned off when the high-voltage input power supply is smaller than or equal to the set voltage; the high-voltage dividing unit is used for dividing the voltage of the high-voltage input power supply; the voltage comparison unit is used for generating a comparison result of the output signal of the high-voltage dividing unit and a reference voltage; and the level conversion unit takes the high-voltage input power supply as the low-voltage output power supply when the high-voltage input power supply is smaller than or equal to the set voltage, and is switched off when the high-voltage input power supply is larger than the set voltage. The high-voltage power conversion circuit, the linear voltage regulator and the electronic product are simple in structure, the output power supply is adjusted according to the voltage value of the high-voltage input power supply, stable power supply is achieved, and the customer experience degree is improved.

Description

Technical Field

[0001] The present invention relates to the field of power supply, and in particular to a high-voltage power supply conversion circuit, a linear voltage regulator and an electronic product. Background Art

[0002] With the continuous development of integrated circuits and semiconductor industries, the functions realized by circuits are increasing, the structures are becoming more and more complex, and the requirements for power supply are becoming higher and higher. The existing power supply module is connected to an external power supply, and performs DC-to-DC conversion based on the external power supply to obtain the working voltage required by each module in the circuit. Once the external power supply suddenly drops, it will cause power shortage, and the related modules will not work normally, which seriously affects the working performance of the circuit.

[0003] Therefore, how to broaden the range of input power and avoid the problem of low input power supply affecting the power supply of internal devices has become one of the problems that technical personnel in this field need to solve urgently.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a high-voltage power conversion circuit, a linear voltage regulator and an electronic product, which are used to solve the internal power supply problem caused by the narrow input power range in the prior art.

[0006] To achieve the above-mentioned object and other related objects, the present invention provides a high-voltage power conversion circuit, which at least includes:

[0007] High voltage input level conversion unit, high voltage voltage dividing unit, voltage comparison unit and level conversion unit;

[0008] The high-voltage input level conversion unit receives a high-voltage input power supply, generates a low-voltage output power supply when the high-voltage input power supply is greater than a set voltage, and is turned off when the high-voltage input power supply is less than or equal to the set voltage;

[0009] The high-voltage voltage dividing unit receives the high-voltage input power supply and divides the high-voltage input power supply;

[0010] The voltage comparison unit is connected to the output end of the high voltage divider unit and receives a reference voltage to generate a comparison result between the output signal of the high voltage divider unit and the reference voltage;

[0011] The level conversion unit is connected to the output end of the voltage comparison unit. When the high-voltage input power supply is less than or equal to the set voltage, the high-voltage input power supply is used as the low-voltage output power supply. When the high-voltage input power supply is greater than the set voltage, the level conversion unit is turned off.

[0012] Optionally, the high-voltage input level conversion unit includes a current limiting module, a clamping module, a first power tube and a capacitor;

[0013] One end of the current limiting module is connected to the high voltage input power supply, and the other end is grounded via the clamping module;

[0014] One end of the first power tube is connected to the high voltage input power supply, the other end serves as the output end of the high voltage input level conversion unit and is grounded via the capacitor, and the control end is connected to the connection node between the current limiting module and the clamping module.

[0015] Optionally, the current limiting module includes a first resistor, and the clamping module includes a first diode; one end of the first resistor is connected to the high-voltage input power supply, and the other end serves as the output end of the current limiting module and is connected to the cathode of the first diode; the anode of the first diode is grounded.

[0016] More optionally, the first power tube is an NMOS tube.

[0017] Optionally, the high-voltage voltage divider unit includes a second resistor and a third resistor; one end of the second resistor is connected to the high-voltage input power supply, and the other end serves as the output end of the high-voltage voltage divider unit and is connected to one end of the third resistor; the other end of the third resistor is grounded.

[0018] Optionally, the non-phase input terminal of the voltage comparison unit is connected to the output terminal of the high-voltage voltage divider unit, and the inverting input terminal receives the reference voltage to output the comparison result.

[0019] Optionally, the level conversion unit includes a level conversion module, a second power tube and a second diode;

[0020] The input end of the level conversion module is connected to the output end of the voltage comparison unit to convert the comparison result from the low level voltage domain to the high level voltage domain;

[0021] One end of the second power tube is connected to the high voltage input power supply, the other end serves as the output end of the level conversion unit and is connected to the cathode of the second diode, and the control end is connected to the output end of the level conversion module; the anode of the second diode is grounded.

[0022] More optionally, the second power tube is a PMOS tube.

[0023] More optionally, the high-voltage power conversion circuit is prepared using a BCD process.

[0024] To achieve the above-mentioned object and other related objects, the present invention further provides a linear voltage stabilizer, which at least comprises: a voltage stabilizing circuit and the above-mentioned high-voltage power conversion circuit;

[0025] The high-voltage power supply conversion circuit is connected to the voltage stabilizing circuit to provide an operating voltage for the voltage stabilizing circuit.

[0026] In order to achieve the above-mentioned object and other related objects, the present invention also provides an electronic product, which at least includes: the above-mentioned high-voltage power conversion circuit.

[0027] As described above, the high-voltage power conversion circuit, linear voltage regulator and electronic product of the present invention have the following beneficial effects:

[0028] The high-voltage power conversion circuit, linear voltage regulator and electronic product circuit of the present invention have simple structures and are provided with two power outputs. When the high-voltage input power is greater than a preset voltage, the first power tube is used to reduce the voltage to obtain a low-voltage output power. When the high-voltage input power is less than or equal to the preset voltage, the first power tube is switched to the second power tube to output the high-voltage input power, thereby raising the low-voltage output power. This solves the problem of power supply to internal devices when the input power is low, thereby improving customer experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shown is a principle block diagram of the high voltage power conversion circuit of the present invention.

[0030] Figure 2 Shown is a structural schematic diagram of the high voltage power conversion circuit of the present invention.

[0031] Figure 3 Shown is a schematic diagram of waveforms of key nodes of the high-voltage power conversion circuit of the present invention.

[0032] Figure 4 It is a schematic structural diagram of the linear regulator of the present invention.

[0033] Component number description

[0034] 1 High voltage power conversion circuit

[0035] 11 High voltage input level conversion unit

[0036] 111 Current Limiting Module

[0037] 112 Clamp Module

[0038] 12 High voltage divider unit

[0039] 13 Voltage comparison unit

[0040] 131 Comparator

[0041] 14 Level conversion unit

[0042] 141 Level conversion module

[0043] 2 Voltage stabilization circuit DETAILED DESCRIPTION

[0044] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0045] See also Figure 1 to Figure 4 It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0046] like Figure 1 As shown, the present invention provides a high-voltage power conversion circuit 1, and the high-voltage power conversion circuit 1 includes:

[0047] The high voltage input level conversion unit 11 , the high voltage voltage dividing unit 12 , the voltage comparison unit 13 and the level conversion unit 14 .

[0048] like Figure 1 As shown, the high-voltage input level conversion unit 11 receives a high-voltage input power supply VDDH, generates a low-voltage output power supply VDDL when the high-voltage input power supply VDDH is greater than a set voltage, and is turned off when the high-voltage input power supply VDDH is less than or equal to the set voltage.

[0049] Specifically, the set voltage can be set according to actual needs. In the present embodiment, the set voltage is set to 5V, that is, when the high-voltage input power supply VDDH is greater than 5V, the low-voltage output power supply VDDL is obtained by voltage reduction (the voltage value of VDDL is less than the voltage value of the high-voltage input power supply VDDH); when the high-voltage input power supply VDDH drops to less than or equal to 5V, the high-voltage input level conversion unit 11 is turned off and no output power is provided.

[0050] Specifically, in this embodiment, the high-voltage input level conversion unit 11 includes a current limiting module 111, a clamping module 112, a first power tube M1 and a capacitor C1. One end of the current limiting module 111 is connected to the high-voltage input power supply VDDH, and the other end is grounded GND via the clamping module 112 to obtain an output voltage VDDH_L; as an example, the current limiting module 111 includes a first resistor R1, and the clamping module 112 includes a first diode D1, one end of the first resistor R1 is connected to the high-voltage input power supply VDDH, the other end of the first resistor R1 is connected to the cathode of the first diode D1, and the anode of the first diode D1 is grounded GND; further, as an example, the output voltage VDDH_L of the connection node between the current limiting module 111 and the clamping module 112 is set to VDDH-5V. One end of the first power tube M1 is connected to the high-voltage input power supply VDDH, the other end serves as the output end of the high-voltage input level conversion unit 11 and is grounded GND via the capacitor C1, and the control end is connected to the connection node between the current limiting module 111 and the clamping module 112; as an example, the first power tube M1 is an NMOS tube, the drain is connected to the high-voltage input power supply VDDH, the gate is connected to the sampling voltage VDDH_L, and the source is connected to the upper plate of the capacitor C1. When the high-voltage input power supply VDDH is greater than the set voltage, the output voltage VDDH_L drives the first power tube M1 to turn on and generate a corresponding current I1 to charge the capacitor C1, thereby obtaining a low-voltage output power supply VDDL; when the high-voltage input power supply VDDH is less than or equal to the set voltage, the output voltage VDDH_L turns off the first power tube M1 and does not provide the charging current I1.

[0051] It should be noted that in actual use, the specific circuit structure of the high voltage input level conversion unit 11 and the switching relationship between the output voltage VDDH_L and the first power tube M1 can be set as needed, as long as the logical relationship of the present invention can be realized.

[0052] like Figure 1 As shown, the high voltage dividing unit 12 receives the high voltage input power source VDDH and divides the high voltage input power source VDDH.

[0053] Specifically, in this embodiment, the high-voltage voltage divider unit 12 includes a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected to the high-voltage input power supply VDDH, and the other end is used as the output end of the high-voltage voltage divider unit 12 and connected to one end of the third resistor R3; the other end of the third resistor R3 is grounded GND. The resistance values ​​(ratios) of the second resistor R2 and the third resistor R3 can be configured as needed, so that the divided voltage V1 of the high-voltage input power supply VDDH is within the recognizable range of the voltage comparison unit 13, and will not be described in detail here.

[0054] It should be noted that any circuit structure that can realize voltage division of the high-voltage input power supply is applicable to the high-voltage voltage division unit of the present invention, and is not limited to this embodiment.

[0055] like Figure 1 As shown, the voltage comparison unit 13 is connected to the output end of the high voltage divider unit 12 and receives a reference voltage VREF to generate a comparison result V2 between the output signal V1 of the high voltage divider unit 12 and the reference voltage VREF.

[0056] Specifically, the specific relationship between the reference voltage VREF and the preset voltage can be configured according to device parameters, so that when VDDH is less than or equal to the preset voltage, V1≤VREF; when VDDH is greater than the preset voltage, V1>VREF. The relationship between the high-voltage input power supply VDDH and the preset voltage can be determined by comparing the output signal V1 of the high-voltage divider unit 12 with the reference voltage VREF. Details will not be elaborated here.

[0057] Specifically, in this embodiment, the voltage comparison unit 13 is implemented by a comparator 131. The non-phase input terminal of the voltage comparison unit 13 is connected to the output terminal of the high-voltage voltage divider unit 12, and the inverting input terminal receives the reference voltage VREF, and outputs the comparison result V1. That is, when the output signal V1 of the high-voltage voltage divider unit 12 is greater than the reference voltage VREF, a high level is output, and when the output signal V1 of the high-voltage voltage divider unit 12 is less than or equal to the reference voltage VREF, a low level is output. In actual use, the level corresponding to the size relationship can be set as needed, and is not limited to this embodiment.

[0058] like Figure 1 As shown, the level conversion unit 14 is connected to the output end of the voltage comparison unit 13. When the high-voltage input power supply VDDH is less than or equal to the set voltage, the high-voltage input power supply VDDH is output as the output power supply VDDL; when the high-voltage input power supply VDDH is greater than the set voltage, the level conversion unit 14 is turned off.

[0059] Specifically, in this embodiment, the level conversion unit 14 includes a level conversion module 141, a second power tube M2 and a second diode D2. The input end of the level conversion module 141 is connected to the output end of the voltage comparison unit 13 to convert the comparison result V2 from the low level voltage domain to the high level voltage domain. One end of the second power tube M2 is connected to the high-voltage input power supply VDDH, the other end is used as the output end of the level conversion unit 14 and connected to the cathode of the second diode D2, the control end is connected to the output end of the level conversion module 141, and the anode of the second diode D2 is grounded GND; as an example, the second power tube M2 is a PMOS tube, the source is connected to the high-voltage input power supply VDDH, the gate is connected to the output end of the level conversion module 141 (receiving the comparison result V2), and the drain is connected to the cathode of the second diode D2. When the high-voltage input power supply VDDH is less than or equal to the set voltage, the low level output by the level conversion module 141 turns on the second power tube M2 and drives the second power tube M2 to generate a corresponding current I2, thereby obtaining a low-voltage output power supply VDDL (at this time, VDDL≈VDDH, and the difference between the two is the voltage drop across the source and drain of the second power tube M2); when the high-voltage input power supply VDDH is greater than the set voltage, the high level output by the level conversion module 141 turns off the second power tube M2 and does not provide the current I2.

[0060] It should be noted that any circuit structure that can raise the output power voltage based on the high voltage input power when the high voltage input power is less than or equal to the preset voltage is applicable to the level conversion unit of the present invention, and is not limited to this embodiment.

[0061] As an implementation method of the present invention, the high-voltage power conversion circuit 1 is prepared using a BCD (Bipolar-CMOS-DMOS) process; the BCD process refers to a manufacturing process that integrates analog, digital and power functions on the same chip, which can achieve highly integrated, small size, low power consumption and high performance circuit design.

[0062] like Figure 3As shown, when the high-voltage input power supply VDDH is less than or equal to the set voltage (at this time, V1 is less than or equal to VREF), the level conversion unit 14 raises the low-voltage output power supply VDDL to VDDH. At this time, the first power tube M1 is turned off, and the low-voltage output power supply VDDL is provided by the level conversion unit 14; when the high-voltage input power supply VDDH is greater than the set voltage, a low-voltage output power supply VDDL is generated after conversion by the high-voltage input level conversion unit 11 to power subsequent low-voltage devices (as an example, the typical operating voltage of the internal low-voltage devices is set to 5V). At this time, V1 is greater than VREF, the second power tube M2 is turned off, and the low-voltage output power supply VDDL is provided by the high-voltage input level conversion unit 11; thereby ensuring that the low-voltage output power supply VDDL is always sufficient to power subsequent circuits, avoiding the problem of low power supply affecting the power supply of subsequent circuits.

[0063] like Figure 4 As shown, the present invention also provides a linear voltage stabilizer, which includes: a voltage stabilizing circuit 2 and a high-voltage power conversion circuit 1 of the present invention, wherein the high-voltage power conversion circuit 1 is connected to the voltage stabilizing circuit 2 to provide a working voltage for the voltage stabilizing circuit 2.

[0064] Specifically, in the prior art, the working voltage of the voltage stabilizing circuit 2 is provided by an external power supply. Once the external power supply is low, the voltage stabilizing circuit 2 will not be able to provide sufficient voltage, thereby causing the subsequent circuit to be powered off. The voltage stabilizing circuit 2 of the present invention obtains power from the high-voltage power conversion circuit 1. When the high-voltage input power supply VDDH is greater than the set voltage, the low-voltage output power supply VDDL is obtained from the high-voltage input level conversion unit 11; when the high-voltage input power supply VDDH is less than or equal to the set voltage, the low-voltage output power supply VDDL is obtained from the level conversion unit 14; to avoid the problem of too low power supply voltage, a stable power supply voltage V_LDO is generated.

[0065] The present invention also provides an electronic product, which at least includes: the high-voltage power conversion circuit 1 of the present invention. The electronic product includes but is not limited to personal consumer electronic products (watches, mobile phones, computers, etc.) and medical monitoring electronic products, which are not described in detail here.

[0066] In summary, the present invention provides a high-voltage power conversion circuit, a linear voltage regulator and an electronic product, including: a high-voltage input level conversion unit, a high-voltage voltage dividing unit, a voltage comparison unit and a level conversion unit; the high-voltage input level conversion unit receives a high-voltage input power supply, generates a low-voltage output power supply when the high-voltage input power supply is greater than a set voltage, and the high-voltage input level conversion unit is turned off when the high-voltage input power supply is less than or equal to the set voltage; the high-voltage voltage dividing unit receives the high-voltage input power supply and divides the high-voltage input power supply; the voltage comparison unit is connected to the output end of the high-voltage voltage dividing unit, receives a reference voltage, and generates a comparison result between the output signal of the high-voltage voltage dividing unit and the reference voltage; the level conversion unit is connected to the output end of the voltage comparison unit, and uses the high-voltage input power supply as the low-voltage output power supply when the high-voltage input power supply is less than or equal to the set voltage, and the level conversion unit is turned off when the high-voltage input power supply is greater than the set voltage. The high-voltage power conversion circuit, linear voltage regulator and electronic product of the present invention have simple structures, and adjust the output power supply according to the voltage value of the high-voltage input power supply to achieve stable power supply and improve customer experience. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A high voltage power conversion circuit, characterized in that: The high voltage power conversion circuit at least comprises: High voltage input level conversion unit, high voltage voltage dividing unit, voltage comparison unit and level conversion unit; The high-voltage input level conversion unit receives a high-voltage input power supply, generates a low-voltage output power supply when the high-voltage input power supply is greater than a set voltage, and is turned off when the high-voltage input power supply is less than or equal to the set voltage; The high-voltage voltage dividing unit receives the high-voltage input power supply and divides the high-voltage input power supply; The voltage comparison unit is connected to the output end of the high voltage divider unit and receives a reference voltage to generate a comparison result between the output signal of the high voltage divider unit and the reference voltage; The level conversion unit is connected to the output end of the voltage comparison unit. When the high-voltage input power supply is less than or equal to the set voltage, the high-voltage input power supply is used as the low-voltage output power supply. When the high-voltage input power supply is greater than the set voltage, the level conversion unit is turned off.

2. The high voltage power conversion circuit according to claim 1, characterized in that: The high-voltage input level conversion unit includes a current limiting module, a clamping module, a first power tube and a capacitor; One end of the current limiting module is connected to the high voltage input power supply, and the other end is grounded via the clamping module; One end of the first power tube is connected to the high voltage input power supply, the other end serves as the output end of the high voltage input level conversion unit and is grounded via the capacitor, and the control end is connected to the connection node between the current limiting module and the clamping module.

3. The high voltage power conversion circuit according to claim 2, characterized in that: The current limiting module includes a first resistor, and the clamping module includes a first diode; one end of the first resistor is connected to the high-voltage input power supply, and the other end serves as the output end of the current limiting module and is connected to the cathode of the first diode; the anode of the first diode is grounded.

4. The high voltage power conversion circuit according to claim 2, characterized in that: The first power tube is an NMOS tube.

5. The high voltage power conversion circuit according to claim 1, characterized in that: The high-voltage voltage divider unit includes a second resistor and a third resistor; one end of the second resistor is connected to the high-voltage input power supply, and the other end serves as the output end of the high-voltage voltage divider unit and is connected to one end of the third resistor; the other end of the third resistor is grounded.

6. The high voltage power conversion circuit according to claim 1, characterized in that: The non-phase input terminal of the voltage comparison unit is connected to the output terminal of the high-voltage voltage divider unit, and the inverting input terminal receives the reference voltage and outputs the comparison result.

7. The high voltage power conversion circuit according to claim 1, characterized in that: The level conversion unit includes a level conversion module, a second power tube and a second diode; The input end of the level conversion module is connected to the output end of the voltage comparison unit to convert the comparison result from the low level voltage domain to the high level voltage domain; One end of the second power tube is connected to the high voltage input power supply, the other end serves as the output end of the level conversion unit and is connected to the cathode of the second diode, and the control end is connected to the output end of the level conversion module; the anode of the second diode is grounded.

8. The high voltage power conversion circuit according to claim 7, characterized in that: The second power tube is a PMOS tube.

9. The high voltage power conversion circuit according to any one of claims 1 to 8, characterized in that: The high-voltage power conversion circuit is prepared by using the BCD process.

10. A linear regulator, characterized in that: The linear voltage regulator at least comprises: a voltage stabilizing circuit and a high-voltage power conversion circuit as claimed in any one of claims 1 to 9; The high-voltage power supply conversion circuit is connected to the voltage stabilizing circuit to provide an operating voltage for the voltage stabilizing circuit.

11. An electronic product, characterized in that: The electronic product at least comprises: a high-voltage power conversion circuit as described in any one of claims 1-9.

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