Progressive switchable alternative power supply circuit board

Abstract

The utility model discloses a progressive switchable alternative power supply circuit board, which is connected with a 12V direct current power supply and comprises a first power supply module, a second power supply module and a circuit board body, the first power supply module is arranged on the front panel of the circuit board body; the second power supply module is arranged on a back panel of the circuit board body; the input end of the first power supply module and the input end of the second power supply module are both connected with a 12V direct-current power supply, the output end of the first power supply module and the output end of the second power supply module are both connected with a voltage output end CVDD, and the first power supply module and the second power supply module alternately and independently supply power; according to the utility model, the design of the dual-power control chip is adopted, the power supply modules are respectively designed on the front and back surfaces of the circuit board, the circuit board for non-pin-to-pin localization substitution under the condition of mass production of a stable model frame can be realized, the power supply circuit is stable and reliable under the principle of non-inductive substitution, and the cost of the power supply control module is reduced.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit board technology, and more specifically to a progressively switchable alternative power supply circuit board. Background Technology

[0002] With the rapid development of domestic electronic products and the fast pace of product updates, and due to the volatile international situation, there is a need for domestically produced components to replace electrical components on existing mature circuit boards as soon as possible. However, the cost of manufacturing existing circuit boards is relatively high, especially for multi-layer circuit boards with many layers, which have long manufacturing cycles and correspondingly high verification costs after modification.

[0003] Meanwhile, with the increasing demand for products, new requirements have been put forward for the design and verification of power supply circuit boards. They must not only avoid affecting the production of existing products, but also achieve domestic substitution without interference. In particular, for electrical components that cannot be replaced by pin-to-pin, circuit boards need to be redesigned, and it is also necessary to ensure that production is not affected even if the replacement design fails.

[0004] Therefore, how to achieve domestic substitution of non-pin-to-pin power supply circuit boards within the framework of mass-produced stable models is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a progressively switchable alternative power supply circuit board to solve some of the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A progressive switchable alternative power supply circuit board, connected to a 12V DC power supply, includes: a first power module, a second power module, and a circuit board body;

[0008] The first power module is located on the front panel of the circuit board body;

[0009] The second power module is located on the back panel of the circuit board body;

[0010] The input terminals of both the first power module and the second power module are connected to a 12V DC power supply. The output terminals of both the first power module and the second power module are connected to a voltage output terminal CVDD. The first power module and the second power module alternately provide independent power.

[0011] Preferably, the vias of the first power module on the front panel and the second power module on the back panel of the circuit board are through-hole type.

[0012] Preferably, the first power module includes an MPS54625 chip U16;

[0013] The power input pins VIN1 and VIN2 of U16 are connected to a 12V DC power supply, and the enable signal pin EN of U16 is connected to a 12V DC power supply through an external voltage control unit.

[0014] The SW terminal switching nodes SW1 and SW2 of U16 are the connection points of the internal power MOSFET. The VBST pin of U16 is connected to one end of the series capacitor C375. The other end of the capacitor C375 is connected to SW1, SW2 and resistor R191 respectively. Resistor R191 is grounded through the series capacitor C376.

[0015] After SW2 is connected to SW1, it is connected to the VO pin, VFB pin and voltage output terminal CVDD respectively through the series power inductor L1.

[0016] Preferably, the VREG pin of U16 is connected to one end of capacitor C370 and resistor R189 respectively, the other end of capacitor C370 is grounded, and the other end of resistor R189 is connected to the power good pin PG of U16 and resistor R190 respectively, with resistor R190 grounded.

[0017] Preferably, the power inductor L1 is connected to one end of the resistor R193, the other end of the resistor R193 is connected to the VFB pin of U16 and the resistor R194 respectively, and the other end of the resistor R194 is grounded.

[0018] Preferably, the first power module further includes an input conditioning circuit and an output conditioning circuit;

[0019] The input conditioning circuit is as follows: a 12V DC power supply is connected to one end of capacitors C371, C374 and C372 respectively, and then connected to the power input pins VIN1 and VIN2 of U16. The other ends of capacitors C371, C374 and C372 are connected to ground and connected to one end of resistor R192. The other end of resistor R192 is connected to the enable signal pin CVDD_EN of U16.

[0020] The output conditioning circuit is as follows: after the power inductor L1 is connected to one end of the resistor R193, it is connected in sequence to one end of the capacitors C377, C378, C379 and C380, as well as the voltage output terminal CVDD of U16. The other ends of the capacitors C377, C378, C379 and C380 are grounded.

[0021] Preferably, the SS pin of the MPS54625 chip U16 is grounded after being connected in series with a capacitor, and the PGMD1 pin, PGND2 pin, GND pin and PAD pin are grounded.

[0022] Preferably, the second power supply module includes an MP8756 chip U70;

[0023] The power input pin VIN of U70 is connected to a 12V DC power supply, and the enable signal pin EN of U70 is connected to ground in series with the R563 pull-down resistor, together forming an enable module.

[0024] The SW terminal of U70 is the connection point of the internal power MOSFET. The BST pin of U70 is connected in series with resistor R567 and then connected to one end of capacitor C993. The other end of capacitor C993 is connected to SW, one end of inductor L7, and one end of resistor R568. The other end of resistor R568 is connected in series with capacitor C994 and then connected to the other end of inductor L7. The other end of resistor R568 is also connected to one end of resistor R569.

[0025] After inductor L7 and capacitor C994 are connected, they are connected to one end of resistor R570, the VOUT pin of U70 and the voltage output terminal CVDD respectively. The other end of resistor R570 is connected to one end of resistor R571, the other end of resistor R569 and the FB pin of U70 respectively. The other end of resistor R571 is grounded.

[0026] Preferably, the power good pin PG of U70 is connected to one end of resistor R562, the other end of resistor R562 is connected to the VCC pin of U70, one end of capacitor C1018 and one end of resistor R565, the other end of resistor R565 is connected to the MODE pin of U70 and one end of resistor R566, and the other ends of capacitor C1018 and resistor R566 are grounded.

[0027] The VOUT pin of U70 is connected to the voltage output terminal CVDD and one end of capacitor C992, respectively, and the other end of capacitor C992 is grounded.

[0028] Both the AGND and PGND pins of U70 are grounded.

[0029] Preferably, the second power module further includes an input conditioning circuit and an output conditioning circuit;

[0030] The input conditioning circuit is as follows: a 12V DC power supply is connected to one end of capacitors C1020, C1021 and C1017 respectively, and then connected to the power input pin VIN of U70. The other end of capacitors C1020, C1021 and C1017 is grounded.

[0031] The output conditioning circuit is as follows: After the power inductor L7 is connected to the VOUT pin of U70, it is connected in sequence to one end of capacitors C1019, 997, C998, C1022, C1024, and then connected to the voltage output terminal CVDD. The other ends of capacitors C1019, 997, C998, C1022, C1024, and C1024 are grounded.

[0032] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a progressive switchable replacement power supply circuit board, which adopts a dual power control chip design and designs power supply modules on both the front and back sides of the circuit board. It can realize the non-pin-to-pin domestic replacement of the circuit board under the framework of mass production stable models. Under the principle of seamless replacement, the power supply circuit is stable and reliable, and the cost of power control module is reduced. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0034] Figure 1 The attached figure is a schematic diagram of a progressive switchable alternative power supply circuit board provided by this utility model;

[0035] Figure 2 The attached figure is a schematic diagram of the first power module circuit of the front panel provided by this utility model;

[0036] Figure 3 The attached figure is a schematic diagram of the second power module circuit of the back panel provided by this utility model. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] This utility model embodiment discloses a progressively switchable alternative power supply circuit board, which is connected to a 12V DC power supply, such as... Figure 1 It includes: a first power module, a second power module, and a circuit board body;

[0039] The first power module is located on the front panel of the circuit board body;

[0040] The second power module is located on the back panel of the circuit board body;

[0041] The input terminals of both the first power module and the second power module are connected to a 12V DC power supply. The output terminals of both the first power module and the second power module are connected to a voltage output terminal CVDD. The first power module and the second power module alternately provide independent power.

[0042] In this embodiment, the 12V DC power supply is rectified by inductor FB13 and then connected to the input terminals of the first power module and the second power module respectively. The rectifier inductor FB13 is 100MΩ and 4A.

[0043] To further implement the above technical solution, the vias of the first power module on the front panel and the second power module on the back panel of the circuit board are made using through-hole technology.

[0044] In practical applications, when designing board layouts for different schemes of front and rear power modules, considering heat dissipation, interference, and the rationality of board manufacturing and soldering processes, a double-sided symmetrical layout is adopted for the ground plane section of the board to prevent board warping. Through holes are used instead of blind holes or buried holes.

[0045] To further implement the above technical solutions, such as Figure 2 The first power module includes the MPS54625 chip U16;

[0046] The power input pins VIN1 and VIN2 of U16 are connected to a 12V DC power supply, and the enable signal pin EN of U16 is connected to a 12V DC power supply through an external voltage control unit.

[0047] Pin EN is enabled by an external voltage control signal CVDD_EN (the enable signal from the previous stage). After the enable signal is set to 3.3V, U16 starts working.

[0048] The SW terminal switching nodes SW1 and SW2 of U16 are the connection points of the internal power MOSFET. The VBST pin of U16 is connected to one end of the series capacitor C375. The other end of the capacitor C375 is connected to SW1, SW2 and resistor R191 respectively. Resistor R191 is grounded through the series capacitor C376.

[0049] After SW2 is connected to SW1, it is connected to the VO pin, VFB pin and voltage output terminal CVDD respectively through the series power inductor L1.

[0050] In this embodiment, during the operation of the switching converter, the level of the SW terminal changes with the duty cycle of the PWM signal; the VFB feedback terminal of pin 2 of U16 samples and feeds back to the output module of U16 based on the change of the output voltage of pin 1 VO of U16, and the output voltage is controlled in a stable state by the automatic adjustment circuit. The output voltage is DC0.95~1.05V, and the voltage output terminal CVDD is the power supply voltage supplied to the core computing module of the algorithm processing chip.

[0051] To further implement the above technical solution, the VREG pin of U16 is connected to one end of capacitor C370 and resistor R189 respectively. The other end of capacitor C370 is grounded, and the other end of resistor R189 is connected to the power good pin PG of U16 and resistor R190 respectively. Resistor R190 is grounded.

[0052] In this embodiment, the PG pin of U16 is a power good pin, used to indicate whether the chip's output voltage has stabilized within the normal operating range. When the output voltage reaches the set value DC1V and is in a stable state, the PG pin outputs a high-level signal DC3.3V, used to provide power status feedback to the system or other circuits as an input enable signal for the next stage. Finally, the first power module realizes the function of stably outputting the predetermined output DC1V after being powered by DC12V and turned on by the external enable signal control circuit, and provides the corresponding enable signal to the next stage.

[0053] To further implement the above technical solution, the power inductor L1 is connected to one end of the resistor R193, the other end of the resistor R193 is connected to the VFB pin of U16 and the resistor R194 respectively, and the other end of the resistor R194 is grounded.

[0054] To further implement the above technical solution, the first power module also includes an input conditioning circuit and an output conditioning circuit;

[0055] The input conditioning circuit is as follows: a 12V DC power supply is connected to one end of capacitors C371, C374 and C372 respectively, and then connected to the power input pins VIN1 and VIN2 of U16. The other ends of capacitors C371, C374 and C372 are connected to ground and connected to one end of resistor R192. The other end of resistor R192 is connected to the enable signal pin CVDD_EN of U16.

[0056] The output conditioning circuit is as follows: after the power inductor L1 is connected to one end of the resistor R193, it is connected in sequence to one end of the capacitors C377, C378, C379 and C380, as well as the voltage output terminal CVDD of U16. The other ends of the capacitors C377, C378, C379 and C380 are grounded.

[0057] To further implement the above technical solution, the SS pin of the MPS54625 chip U16 is grounded through a series capacitor, and the PGMD1 pin, PGND2 pin, GND pin and PAD pin are grounded.

[0058] To further implement the above technical solutions, such as Figure 3 The second power module includes the MP8756 chip U70;

[0059] The power input pin VIN of U70 is connected to a 12V DC power supply. The enable signal pin EN of U70 is connected to ground after being connected in series with the pull-down resistor R563. The enable signal CVDD_EN (the enable signal of the previous stage input) is provided by external voltage control. Together with the pull-down resistor R563, they form an enable module. After being set to a high level of 3.3V, U70 starts to work.

[0060] The SW terminal of U70 is the connection point of the internal power MOSFET. The BST pin of U70 is connected in series with resistor R567 and then connected to one end of capacitor C993. The other end of capacitor C993 is connected to SW, one end of inductor L7, and one end of resistor R568. The other end of resistor R568 is connected in series with capacitor C994 and then connected to the other end of inductor L7. The other end of resistor R568 is also connected to one end of resistor R569.

[0061] After inductor L7 and capacitor C994 are connected, they are connected to one end of resistor R570, the VOUT pin of U70 and the voltage output terminal CVDD respectively. The other end of resistor R570 is connected to one end of resistor R571, the other end of resistor R569 and the FB pin of U70 respectively. The other end of resistor R571 is grounded.

[0062] In this embodiment, during the operation of the switching converter, the level of the SW terminal changes with the duty cycle of the PWM signal. The FB feedback terminal of pin 11 of U70 detects the change in the output voltage of pin 5 of U70, and uses the voltage divider circuit of R570 and R571 to sample and feed back the voltage to the output module of U70. The automatic adjustment circuit ensures that the output voltage is controlled in a stable state, and the output voltage is DC 0.95~1.05V. CVDD is the power supply voltage supplied to the core computing module of the algorithm processing chip.

[0063] To further implement the above technical solution, the power good pin PG of U70 is connected to one end of resistor R562. The other end of resistor R562 is connected to the VCC pin of U70, one end of capacitor C1018, and one end of resistor R565. The other end of resistor R565 is connected to the MODE pin of U70 and one end of resistor R566. The other ends of capacitor C1018 and resistor R566 are both grounded.

[0064] The VOUT pin of U70 is connected to the voltage output terminal CVDD and one end of capacitor C992, respectively, and the other end of capacitor C992 is grounded.

[0065] Both the AGND and PGND pins of U70 are grounded.

[0066] In this embodiment, the PG pin of U70 is the Power Good pin, used to indicate whether the chip's output voltage has stabilized within the normal operating range. When the output voltage reaches the set value DC1V and is stable, the PG pin outputs a high-level signal DC3.3V, providing power status feedback to the system or other circuits as an input enable signal for the next stage. Ultimately, this circuit achieves the function of stably outputting a predetermined DC1V after being powered by a DC12V supply and controlled by an external enable signal, and provides the corresponding enable signal to the next stage.

[0067] To further implement the above technical solution, the second power module also includes an input conditioning circuit and an output conditioning circuit;

[0068] The input conditioning circuit is as follows: a 12V DC power supply is connected to one end of capacitors C1020, C1021 and C1017 respectively, and then connected to the power input pin VIN of U70. The other end of capacitors C1020, C1021 and C1017 is grounded.

[0069] The output conditioning circuit is as follows: After the power inductor L7 is connected to the VOUT pin of U70, it is connected in sequence to one end of capacitors C1019, 997, C998, C1022, C1024, and then connected to the voltage output terminal CVDD. The other ends of capacitors C1019, 997, C998, C1022, C1024, and C1024 are grounded.

[0070] In practical applications, two verification operations were performed during the prototype testing phase:

[0071] First, ensuring that all other board components are identical, only the components of the first power module on the front are installed. After power-on testing, the voltage ripple and ground signal fluctuation rate are consistent with the actual batch version. It is determined that the test board using the MPS54625 power chip module solution meets the requirements for subsequent mass production.

[0072] Secondly, ensuring that all other board components are identical, only the components of the back-side test power module are installed. After power-on testing, the voltage ripple and ground signal fluctuation are consistent with the MPS54625 power chip module. Furthermore, the temperature of the test board after long-term power-on is monitored using a thermometer, and the results are in compliance with requirements. The aging test and full-load operation test are both in line with expectations.

[0073] Therefore, the progressive switchable alternative power supply circuit board disclosed in this utility model has carried out a domestic substitution design for the power module part while ensuring continuous mass production activities, which meets the design requirements and expectations.

[0074] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0075] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A progressively switchable alternative power supply circuit board, connected to a 12V DC power supply, characterized in that, include: First power module, second power module and circuit board body; The first power module is located on the front panel of the circuit board body; The second power module is located on the back panel of the circuit board body; The input terminals of both the first power module and the second power module are connected to a 12V DC power supply. The output terminals of both the first power module and the second power module are connected to a voltage output terminal CVDD. The first power module and the second power module alternately provide independent power.

2. The progressive switchable replacement power supply circuit board according to claim 1, characterized in that, The vias of the first power module on the front panel and the second power module on the back panel of the circuit board are through-hole type.

3. The progressive switchable replacement power supply circuit board according to claim 1, characterized in that, The first power module includes the MPS54625 chip U16; The power input pins VIN1 and VIN2 of U16 are connected to a 12V DC power supply, and the enable signal pin EN of U16 is connected to a 12V DC power supply through an external voltage control unit. The SW terminal switching nodes SW1 and SW2 of U16 are the connection points of the internal power MOSFET. The VBST pin of U16 is connected to one end of the series capacitor C375. The other end of the capacitor C375 is connected to SW1, SW2 and resistor R191 respectively. Resistor R191 is grounded through the series capacitor C376. After SW2 is connected to SW1, it is connected to the VO pin, VFB pin and voltage output terminal CVDD respectively through the series power inductor L1.

4. The progressive switchable replacement power supply circuit board according to claim 3, characterized in that, The VREG pin of U16 is connected to one end of capacitor C370 and resistor R189 respectively. The other end of capacitor C370 is grounded. The other end of resistor R189 is connected to pin PG of U16 and resistor R190 respectively. Resistor R190 is grounded.

5. A progressive switchable alternative power supply circuit board according to claim 3, characterized in that, The power inductor L1 is connected to one end of the resistor R193. The other end of the resistor R193 is connected to the VFB pin of U16 and the resistor R194. The other end of the resistor R194 is grounded.

6. A progressively switchable alternative power supply circuit board according to claim 5, characterized in that, The first power module also includes an input conditioning circuit and an output conditioning circuit; The input conditioning circuit is as follows: a 12V DC power supply is connected to one end of capacitors C371, C374 and C372 respectively, and then connected to the power input pins VIN1 and VIN2 of U16. The other ends of capacitors C371, C374 and C372 are connected to ground and connected to one end of resistor R192. The other end of resistor R192 is connected to the enable signal pin CVDD_EN of U16. The output conditioning circuit is as follows: after the power inductor L1 is connected to one end of the resistor R193, it is connected in sequence to one end of the capacitors C377, C378, C379 and C380, as well as the voltage output terminal CVDD of U16. The other ends of the capacitors C377, C378, C379 and C380 are grounded.

7. A progressive switchable alternative power supply circuit board according to claim 3, characterized in that, The SS pin of the MPS54625 chip U16 is grounded through a series capacitor, while the PGMD1, PGND2, GND, and PAD pins are grounded.

8. A progressive switchable alternative power supply circuit board according to claim 1, characterized in that, The second power module includes the MP8756 chip U70; The power input pin VIN of U70 is connected to a 12V DC power supply, and the enable signal pin EN of U70 is connected to ground in series with the R563 pull-down resistor, together forming an enable module. The SW terminal of U70 is the connection point of the internal power MOSFET. The BST pin of U70 is connected in series with resistor R567 and then connected to one end of capacitor C993. The other end of capacitor C993 is connected to SW, one end of inductor L7, and one end of resistor R568. The other end of resistor R568 is connected in series with capacitor C994 and then connected to the other end of inductor L7. The other end of resistor R568 is also connected to one end of resistor R569. After inductor L7 and capacitor C994 are connected, they are connected to one end of resistor R570, the VOUT pin of U70 and the voltage output terminal CVDD respectively. The other end of resistor R570 is connected to one end of resistor R571, the other end of resistor R569 and the FB pin of U70 respectively. The other end of resistor R571 is grounded.

9. A progressive switchable alternative power supply circuit board according to claim 8, characterized in that, The PG pin of U70 is connected to one end of resistor R562. The other end of resistor R562 is connected to the VCC pin of U70, one end of capacitor C1018, and one end of resistor R565. The other end of resistor R565 is connected to the MODE pin of U70 and one end of resistor R566. The other ends of capacitor C1018 and resistor R566 are both grounded. The VOUT pin of U70 is connected to the voltage output terminal CVDD and one end of capacitor C992, respectively, and the other end of capacitor C992 is grounded. Both the AGND and PGND pins of U70 are grounded.

10. A progressive switchable alternative power supply circuit board according to claim 8, characterized in that, The second power module also includes an input conditioning circuit and an output conditioning circuit; The input conditioning circuit is as follows: a 12V DC power supply is connected to one end of capacitors C1020, C1021 and C1017 respectively, and then connected to the power input pin VIN of U70. The other end of capacitors C1020, C1021 and C1017 is grounded. The output conditioning circuit is as follows: After the power inductor L7 is connected to the VOUT pin of U70, it is connected in sequence to one end of capacitors C1019, 997, C998, C1022, C1024, and then connected to the voltage output terminal CVDD. The other ends of capacitors C1019, 997, C998, C1022, C1024, and C1024 are grounded.

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