High-temperature programmed switching power supply circuit based on TPS40200

Abstract

The utility model discloses a high-temperature programmed switching power supply circuit based on TPS40200, comprising a switching power supply circuit which comprises a TPS40200SHKJ chip, a resistor R, a capacitor C, an inductor L, a diode D and a triode Q; the program control circuit comprises a 422H-5 chip, a resistor R, an IO connection port and a triode Q; wherein a VSEL port in the program control circuit is connected with a base pin of the TPS40200SHKJ chip. According to the utility model, the circuit structure design is optimized, the switching power supply circuit and the program control circuit are arranged, and the TPS40200SHKJ chip and the 422H-5 chip are adopted, so that the requirement of stable work in a 200 DEG C high-temperature environment can be completely met, and the requirement of outputting various different voltages can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature switching power supplies, in particular to a high-temperature programmable switching power supply circuit based on TPS40200. Background Art

[0002] Circuits that implement programmable switching power supply functions are now available. Switching power supplies are a mature technology with widespread applications in many fields. They primarily fall into two categories: AC-DC (alternating current to direct current) and DC-DC (direct current to direct current). The core component is a switching power supply chip, with common models including the UC384X series, LM257X series, and TPS series. By using a microcontroller to control the programmable switch and adjusting the circuit parameters, the output can be controlled.

[0003] Existing circuits that implement programmable switching power supply functions have many disadvantages when used in high-temperature environments. For example, output voltage instability may occur in high-temperature environments, excessive output noise may affect the signal quality in the circuit, energy conversion efficiency may be low, and there may even be no output or damage. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a high-temperature programmable switching power supply circuit based on TPS40200, optimize the circuit structure design, and through the setting of the switching power supply circuit and the programmable circuit, use the TPS40200SHKJ chip and the 422H-5 chip, which can fully meet the needs of stable operation in a high temperature environment of 200°C and meet the output of a variety of different voltage requirements.

[0005] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: a high-temperature programmable switching power supply circuit based on TPS40200, comprising:

[0006] A switching power supply circuit, comprising a TPS40200SHKJ chip, a resistor R, a capacitor C, an inductor L, a diode D, and a transistor Q;

[0007] Programmable control circuit, the programmable control circuit includes a 422H-5 chip, a resistor R, an IO connection port, and a transistor Q;

[0008] The V_SEL port in the program-controlled circuit is connected to the pin of the TPS40200SHKJ chip.

[0009] As a preferred solution of the high-temperature programmable switching power supply circuit based on TPS40200 described in the utility model, the TPS40200SHKJ chip includes 8 pins, specifically: pin 1 (RC), pin 2 (SS), pin 3 (COMP), pin 4 (FB), pin (5) GND, pin (6) GDRV, pin 7 (ISNS), and pin 8 (VDD).

[0010] As a preferred solution of the high-temperature programmable switching power supply circuit based on TPS40200 described in the utility model, the operating temperature of the TPS40200SHKJ chip is -55°C-210°C, the switching frequency is 35KHz-500KHz; the input voltage is 4.5V-52V, and the output voltage is 0.7V-46V.

[0011] As a preferred solution of the high-temperature programmable switching power supply circuit based on TPS40200 described in the utility model, the operating temperature of the 422H-5 chip is -65°C-200°C, the coil voltage is 5V, and the maximum withstand voltage is 5.8V.

[0012] As a preferred solution of the high-temperature programmable switching power supply circuit based on TPS40200 described in the utility model, the programmable circuit is provided with 8 voltages, specifically: 3.3V, 4.2V, 5V, 7.8V, 10V, 12V, 15.8V and 18.3V.

[0013] As a preferred solution of the high-temperature programmable switching power supply circuit based on TPS40200 described in the present invention, the V_SEL port in the programmable circuit is specifically connected to pin 4 (FB) and determines the output voltage together with the resistor R16 in the switching power supply circuit.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] The circuit structure design is optimized. By setting up the switching power supply circuit and programmable circuit, and using the TPS40200SHKJ chip and 422H-5 chip, it can fully meet the needs of stable operation in a high temperature environment of 200°C and meet the needs of outputting a variety of different voltages.

[0016] In the switching power supply circuit, VIN is the input voltage, which is first filtered by C1 and then input to pin 8 (VDD) of the TPS40200SHKJ as the supply voltage. The RC oscillator network composed of R1 and C3 provides the switching signal for the TPS40200SHKJ. Its switching frequency can be adjusted by adjusting the values ​​of R1 and C3, calculated as Fc = 1 / (R1*C3*0.105). The excitation pulse is output through pin 6 (GDRV) of the TPS40200SHKJ to control the switching of the external power MOSFET (SI9407). A stable voltage is output through the filtering circuit composed of D1 (1N4148), C7 (capacitor), R15 (resistor), and L1 (inductor). The output voltage is set by resistor R16 connected to pin 4 (FB) of the TPS40200SHKJ and the resistor selected by the programmable circuit, calculated as Vout = 0.708*(1+R16 / R19).

[0017] In the programmable circuit, V_SEL is connected to pin 4 (FB) of the TPS40200SHKJ switching circuit chip. Together with resistor R16 in the switching circuit, it determines the output voltage. The microcontroller's IO port controls the switching of transistor N8050 to select the corresponding voltage. The programmable circuit offers eight different voltage options: 3.3V, 4.2V, 5V, 7.8V, 10V, 12V, 15.8V, and 18.3V. When the transistor is turned on, the coil formed by pins 4 and 5 of the 422H-5 is energized, connecting pins 1 and 3. By controlling different IO ports, a programmable switching power supply can be implemented. If more voltage options are required, the desired output voltage can be obtained by increasing the number of programmable circuits comprised of 422H-5 chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive labor. Among them:

[0019] Figure 1 This is a circuit diagram of the switching power supply circuit of the utility model;

[0020] Figure 2 This is a circuit diagram of the program-controlled circuit of the utility model;

[0021] Figure 3 This is the structural diagram of the TPS40200SHKJ chip of the utility model;

[0022] Figure 4This is a structural diagram of the 422H-5 chip of the utility model. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. People skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0025] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] The utility model provides a high-temperature programmable switching power supply circuit based on TPS40200, optimizes the circuit structure design, and through the setting of the switching power supply circuit and the programmable circuit, adopts the TPS40200SHKJ chip and the 422H-5 chip, which can fully meet the requirements of stable operation in a high temperature environment of 200°C and meet the requirements of outputting a variety of different voltages.

[0028] Figures 1-4 The figure shows the overall structure of an embodiment of a high temperature program-controlled switching power supply circuit based on TPS40200 of the present invention. Figure 1-4 , the main structure of this embodiment includes:

[0029] Switching power supply circuit, the switching power supply circuit includes TPS40200SHKJ chip, resistor R, capacitor C, inductor L, diode D, and transistor Q;

[0030] The TPS40200SHKJ chip includes 8 pins, specifically: pin 1 (RC), pin 2 (SS), pin 3 (COMP), pin 4 (FB), pin (5) GND, pin (6) GDRV, pin 7 (ISNS), pin 8 (VDD);

[0031] The TPS40200SHKJ chip has an operating temperature range of -55°C to 210°C, a switching frequency of 35kHz to 500kHz, an input voltage range of 4.5V to 52V, and an output voltage range of 0.7V to 46V.

[0032] In actual use, VIN is the input voltage in the switching power supply circuit. It is first filtered by C1 and then input to pin 8 (VDD) of the TPS40200SHKJ as the supply voltage. The RC oscillation network composed of R1 and C3 provides the switching signal for the TPS40200SHKJ. Its switching frequency can be adjusted by adjusting the values ​​of R1 and C3, and the calculation formula is Fc = 1 / (R1*C3*0.105). The excitation pulse is output through pin 6 (GDRV) of the TPS40200SHKJ to control the switching of the external power MOSFET (SI9407). A stable voltage is output through the filtering circuit composed of D1 (1N4148), C7 (capacitor), R15 (resistor), and L1 (inductor). The output voltage is set by resistor R16 connected to pin 4 (FB) of the TPS40200SHKJ and the resistor selected by the programmable circuit, and the calculation formula is Vout = 0.708*(1+R16 / R19).

[0033] Programmable control circuit, the programmable control circuit includes 422H-5 chip, resistor R, IO connection port, and transistor Q;

[0034] Among them, the V_SEL port in the programmable circuit is connected to the pin of the TPS40200SHKJ chip;

[0035] The 422H-5 chip has an operating temperature range of -65°C to 200°C, a coil voltage of 5V, and a maximum withstand voltage of 5.8V. The programmable circuit has eight voltage settings: 3.3V, 4.2V, 5V, 7.8V, 10V, 12V, 15.8V, and 18.3V. The V_SEL port in the programmable circuit is specifically connected to pin 4 (FB) and, together with resistor R16 in the switching power supply circuit, determines the output voltage.

[0036] In actual use, V_SEL in the programmable circuit is connected to pin 4 (FB) of the TPS40200SHKJ switching circuit chip, and together with resistor R16 in the switching circuit, determines the output voltage. The microcontroller's IO port controls the switching of transistor N8050 to select the corresponding voltage. The programmable circuit offers eight different voltage options: 3.3V, 4.2V, 5V, 7.8V, 10V, 12V, 15.8V, and 18.3V. When the transistor is turned on, the coil formed by pins 4 and 5 of the 422H-5 is energized, connecting pins 1 and 3. By controlling different IO ports, a programmable switching power supply is achieved. If more voltage options are required, the desired output voltage can be obtained by increasing the number of programmable circuits composed of 422H-5 chips.

[0037] While the present invention has been described above with reference to specific embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as no structural conflicts exist, the various features of the embodiments disclosed herein may be combined with one another in any manner, and the omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. The high temperature program-controlled switching power supply circuit based on TPS40200 is characterized by: include: A switching power supply circuit, comprising a TPS40200SHKJ chip, a resistor R, a capacitor C, an inductor L, a diode D, and a transistor Q; Programmable control circuit, the programmable control circuit includes a 422H-5 chip, a resistor R, an IO connection port, and a transistor Q; The V_SEL port in the program-controlled circuit is connected to the pin of the TPS40200SHKJ chip.

2. The high-temperature programmable switching power supply circuit based on TPS40200 according to claim 1 is characterized in that: The TPS40200SHKJ chip includes 8 pins, specifically: pin 1 (RC), pin 2 (SS), pin 3 (COMP), pin 4 (FB), pin (5) GND, pin (6) GDRV, pin 7 (ISNS), and pin 8 (VDD).

3. The high-temperature programmable switching power supply circuit based on TPS40200 according to claim 2 is characterized in that: The TPS40200SHKJ chip has an operating temperature range of -55°C to 210°C, a switching frequency range of 35KHz to 500KHz, an input voltage range of 4.5V to 52V, and an output voltage range of 0.7V to 46V.

4. The high-temperature programmable switching power supply circuit based on TPS40200 according to claim 3 is characterized in that: The operating temperature of the 422H-5 chip is -65°C-200°C, the coil voltage is 5V, and the maximum withstand voltage is 5.8V.

5. The high-temperature programmable switching power supply circuit based on TPS40200 according to claim 4 is characterized in that: The programmable circuit is provided with 8 voltages, specifically: 3.3V, 4.2V, 5V, 7.8V, 10V, 12V, 15.8V and 18.3V.

6. The high-temperature programmable switching power supply circuit based on TPS40200 according to claim 5, characterized in that: The V_SEL port in the program-controlled circuit is specifically connected to pin 4 (FB), and determines the output voltage together with the resistor R16 in the switching power supply circuit.

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