Small-size low-voltage burst type load power supply module

Abstract

The utility model belongs to the technical field of electronic circuits, and particularly relates to a small-size low-voltage burst type load power supply module, which comprises a power supply module, an inductor, a buck-boost DC-DC circuit, a current sampling resistor and a capacitor, the cathode of the power supply module is grounded, and the anode of the power supply module is connected to the buck-boost DC-DC circuit; the two ends of the inductor are connected to the buck-boost DC-DC circuit, the output end of the buck-boost DC-DC circuit is connected with one end of the current sampling resistor, and the other end of the current sampling resistor is connected with the positive electrode of the capacitor. The cathode of the capacitor is grounded; according to the utility model, the purpose of multiplying the instantaneous load capacity of the low and wide power supply voltage power supply is realized by adopting the combination of the small-size and low-power buck-boost DC-DC and the super capacitor.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic circuits, and in particular relates to a small-volume, low-voltage burst-type load power supply module. Background Art

[0002] A power module is a power supply that can be mounted directly on a printed circuit board. Its unique feature is its ability to power application-specific integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memory, field-programmable gate arrays (FPGAs), and other digital or analog loads. Generally speaking, these power modules are called point-of-load (POL) power supplies or point-of-use power supplies (PUPS). Due to their complex structure, this type of power supply has seen significant growth in recent years. With the government's strong support for the power industry and the increasing maturity of power-related components, modular power supplies have seen further development in the industry. They are primarily used in devices such as electricity meters and concentrators. Modular power supplies used in power equipment are called power module power supplies.

[0003] Existing power modules are small in size, have low battery capacity, and have weak instantaneous high-power load capability. Furthermore, they have a wide and low supply voltage range and need to instantaneously carry high-power loads, which makes implementation very difficult. Common solutions use high-power DC-DC power conversion to achieve high load capacity, but this approach is costly and bulky, making it difficult to cover certain areas with high cost and volume requirements. Summary of the Invention

[0004] To solve the problems existing in the above-mentioned prior art, the present invention designs a small-volume, low-voltage burst load power supply module, which includes: a power module, an inductor, a buck-boost DC-DC circuit, a current sampling resistor and a capacitor; the negative pole of the power module is grounded, and the positive pole of the power module is connected to the buck-boost DC-DC circuit; the two ends of the inductor are connected to the buck-boost DC-DC circuit, the output end of the buck-boost DC-DC circuit is connected to one end of the current sampling resistor, and the other end of the current sampling resistor is connected to the positive pole of the capacitor; the negative pole of the capacitor is grounded.

[0005] Preferably, the buck-boost DC-DC circuit is composed of four enhancement mode MOS transistors.

[0006] Furthermore, the enhanced MOS transistor adopts an N-channel NMOS transistor.

[0007] Furthermore, the connection relationship of the four enhancement-mode MOS transistors is as follows: the drain of the first enhancement-mode MOS transistor is connected to an external power supply, and the source is respectively connected to the drain of the second enhancement-mode MOS transistor and one end of the inductor; the source of the second enhancement-mode MOS transistor is grounded; the drain of the third enhancement-mode MOS transistor is connected to the sampling resistor, and the source is respectively connected to the other end of the inductor and the drain of the fourth enhancement-mode MOS transistor; the source of the fourth enhancement-mode MOS transistor is grounded; and the gates of the first enhancement-mode MOS transistor, the second enhancement-mode MOS transistor, the third enhancement-mode MOS transistor, and the fourth enhancement-mode MOS transistor are connected to the input signal.

[0008] Furthermore, the maximum input power of the buck-boost DC-DC circuit is 7.2W.

[0009] Preferably, the burst load power supply module is externally connected to a load.

[0010] Preferably, the capacitance of the capacitor is 2F.

[0011] Beneficial effects of the utility model:

[0012] This utility model adopts a combination of a small volume, low power buck-boost DC-DC plus a supercapacitor to achieve the purpose of doubling the instantaneous load capacity of a low and wide supply voltage power supply. At the same time, the solution is simple, practical, low cost, and high efficiency, and ultra-low power consumption is achieved through enabling control. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of the sudden high-power power supply module of the utility model;

[0014] Figure 2 This is a structural diagram of the external active antenna based on the sudden high-power power supply module of the present utility model. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] A small-volume, low-voltage burst load power supply module, such as Figure 1 The module includes: a power module, an inductor, a buck-boost DC-DC circuit, a current sampling resistor, and a capacitor; the negative pole of the power module is grounded, and the positive pole of the power module is connected to the buck-boost DC-DC circuit; both ends of the inductor are connected to the buck-boost DC-DC circuit, the output end of the buck-boost DC-DC circuit is connected to one end of the current sampling resistor, and the other end of the current sampling resistor is connected to the positive pole of the capacitor; the negative pole of the capacitor is grounded.

[0017] Preferably, the buck-boost DC-DC circuit is composed of four enhancement-mode MOS transistors, wherein the enhancement-mode MOS transistors are N-channel NMOS transistors.

[0018] In this embodiment, the connection relationship of the four enhancement-mode MOS transistors is as follows: the drain of the first enhancement-mode MOS transistor is connected to an external power supply, and the source is respectively connected to the drain of the second enhancement-mode MOS transistor and one end of the inductor; the source of the second enhancement-mode MOS transistor is grounded; the drain of the third enhancement-mode MOS transistor is connected to a sampling resistor, and the source is respectively connected to the other end of the inductor and the drain of the fourth enhancement-mode MOS transistor; the source of the fourth enhancement-mode MOS transistor is grounded; and the gates of the first enhancement-mode MOS transistor, the second enhancement-mode MOS transistor, the third enhancement-mode MOS transistor, and the fourth enhancement-mode MOS transistor are connected to an input signal.

[0019] A buck-boost DC-DC is used to manage the charging of a supercapacitor. The charging management circuit limits the charging current and voltage, and adjusts the current limit to adjust the load size of the power supply, so that the power supply can easily carry the load and the supercapacitor voltage will not be over-voltage.

[0020] Optionally, a supercapacitor can be used as the capacitor. The supercapacitor is used to carry high-power sudden loads. When the load suddenly increases, the supercapacitor and DC-DC discharge at the same time, thereby doubling the instantaneous load capacity of the main power supply. By increasing the DC-DC charge and discharge current and the size of the supercapacitor, the instantaneous load capacity can be increased by several times or even dozens of times.

[0021] In this embodiment, an external active antenna based on a small-volume, low-voltage burst load power supply module is provided, such as Figure 2 As shown, the active antenna consists of a resistor, a burst load power supply module, multiple low-noise amplifiers (LNAs), and multiple filters; the external active antenna is externally connected to a Beidou dual-mode handheld terminal.

[0022] The plurality of low noise amplifiers (LNAs) include six low noise amplifiers (LNAs), namely a first low noise amplifier, a second low noise amplifier, a third low noise amplifier, a fourth low noise amplifier, a fifth low noise amplifier, and a sixth low noise amplifier.

[0023] The plurality of filters include six filters, namely a first filter, a second filter, a third filter, a fourth filter, a fifth filter and a sixth filter.

[0024] The specific connection relationship of the internal circuit of the external active antenna is as follows: one end of the resistor is connected to the input end of the burst load power supply module, and the other end of the resistor is respectively connected to the input end of the first filter, the output end of the third filter and the output end of the fifth filter; the output end of the burst load power supply module is respectively connected to the positive power supply end of the first low noise amplifier and the positive power supply end of the second low noise amplifier; the negative power supply end of the first low noise amplifier is connected to the positive power supply end of the third low noise amplifier, the output end of the first low noise amplifier is connected to the input end of the second filter; the output end of the second filter is connected to the input end of the second low noise amplifier; the negative power supply end of the second low noise amplifier is connected to the positive power supply end of the fourth low noise amplifier. The positive pole of the power source is connected to the antenna, and the output end of the second low noise amplifier is connected to the antenna; the input end of the fourth low noise amplifier is connected to the antenna, the negative pole of the power supply of the fourth low noise amplifier is connected to the positive pole of the power supply of the sixth low noise amplifier, and the output end of the fourth low noise amplifier is connected to the input end of the fourth filter; the output end of the fourth filter is connected to the input end of the third low noise amplifier; the negative pole of the power supply of the third low noise amplifier is connected to the positive pole of the power supply of the fifth low noise amplifier, and the book end of the third low noise amplifier is connected to the input end of the third filter; the input end of the fifth filter is connected to the output end of the fifth low noise amplifier; the input end of the fifth low noise amplifier is connected to the output end of the sixth low noise amplifier, and the input end of the sixth low noise amplifier is connected to the antenna.

[0025] Optionally, the external active antenna is connected to the Beidou dual-mode handheld terminal through an external cable.

[0026] Optionally, the length of the external cable is 2 m to 10 m.

[0027] Preferably, the length of the external cable is 8m.

[0028] The battery power port output voltage of the Beidou dual-mode handheld terminal is 5±0.2V@2A, the external antenna is in a static state of 5V@200mA, and the power amplifier transmits 5V@4A. The power amplifier transmits once per minute, and each transmission lasts for up to 200mS. Considering the maximum cable length of 10m, the cable voltage drop is about 70mV when the external antenna is in a static state. During the power amplifier transmission, the voltage drop is about 1.4V at 4A. At this time, the voltage reaching the external antenna through the cable is about 3.6V. Under normal circumstances, the performance indicators are not met and communication is impossible, and the power supply is insufficient. Based on this application, a sudden high-power power supply module is added.

[0029] The design principle of the burst high-power power supply module is limited by the power supply limit of 10W (within 5V*2A) of the Beidou dual-mode handheld terminal. Therefore, the maximum buck-boost DC-DC input power of the burst high-power power supply module is 7.2W (3.6V*2A considering cable loss). Therefore, the buck-boost DC-DC conversion efficiency is 90%, and the current is no more than 1.3A when the output voltage is 5V. Therefore, the DC-DC output current is adjusted to 1.3A, the external antenna electrostatic current is 200mA, and the supercapacitor charging current is 1.1A. When the supercapacitor is 5V, the communication transmission is 4A200mS. It is assumed that the system can withstand ±150mV voltage fluctuations.

[0030] In the event of a sudden communication discharge, the DC-DC and capacitor together provide the load. The DC-DC provides 1.1A current, and the capacitor C is 2F.

[0031] The time required to charge a 2F capacitor is 0.546S; the time required to charge the capacitor is 0.546S, the discharge time is 0.2S, and the discharge duty cycle is 26.8%.

[0032] This burst high-power power supply module meets the requirements of applications with a burst load duty cycle of up to 26.8%. By using a similar design principle, the capacitor parameters and discharge current can be adjusted to meet specific application requirements.

[0033] The above embodiments further illustrate the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above embodiments are only preferred implementation plans of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A small-volume, low-voltage, burst-type load power supply module, characterized in that: The module includes: a power module, an inductor, a buck-boost DC-DC circuit, a current sampling resistor and a capacitor; the negative pole of the power module is grounded, and the positive pole of the power module is connected to the buck-boost DC-DC circuit; both ends of the inductor are connected to the buck-boost DC-DC circuit, the output end of the buck-boost DC-DC circuit is connected to one end of the current sampling resistor, and the other end of the current sampling resistor is connected to the positive pole of the capacitor; the negative pole of the capacitor is grounded.

2. The small-volume, low-voltage, burst-type load power supply module according to claim 1, characterized in that: The buck-boost DC-DC circuit consists of four enhancement mode MOS tubes.

3. The small-volume, low-voltage, burst-type load power supply module according to claim 2, characterized in that: The enhanced MOS tube uses an N-channel NMOS tube.

4. The small-volume, low-voltage, burst-type load power supply module according to claim 3, characterized in that: The connection relationship of the four enhancement MOS transistors is as follows: the drain of the first enhancement MOS transistor is connected to an external power supply, and the source is respectively connected to the drain of the second enhancement MOS transistor and one end of the inductor; the source of the second enhancement MOS transistor is grounded; the drain of the third enhancement MOS transistor is connected to the sampling resistor, and the source is respectively connected to the other end of the inductor and the drain of the fourth enhancement MOS transistor; the source of the fourth enhancement MOS transistor is grounded; and the gates of the first enhancement MOS transistor, the second enhancement MOS transistor, the third enhancement MOS transistor, and the fourth enhancement MOS transistor are connected to the input signal.

5. The small-volume, low-voltage, burst-type load power supply module according to claim 4, characterized in that: The maximum input power of the buck-boost DC-DC circuit is 7.2W.

6. The small-volume, low-voltage, burst-type load power supply module according to claim 1, characterized in that: The burst load power supply module is connected to an external load.

7. The small-volume, low-voltage, burst-type load power supply module according to claim 1, characterized in that: The capacitance of the capacitor is 2F.

Images