CN104201898A - An integrated DC/DC power supply front-end controller, control method and control system - Google Patents

Abstract

The invention discloses an integrated DC/DC power supply front-end control system, which at least comprises an integrated DC/DC power supply front-end controller, wherein one integrated DC/DC power supply front-end controller works in a main working mode, other integrated DC/DC power supply front-end controllers work in a slave working mode, and the integrated DC/DC power supply front-end controller working in the main working mode outputs a clock signal to the integrated DC/DC power supply front-end controller working in the slave working mode. The power consumption can be reduced, and particularly, when a plurality of groups of integrated DC/DC power controllers form an integrated power supply front-end control system, resources are saved. And the DC/DC conversion function of different voltage requirements is realized by connecting one or more transformers.

Description

An integrated DC/DC power supply front-end controller, control method and control system

technical field

The invention relates to the field of power supply of a power supply module, in particular to a front-end control system powered by a DC/DC power supply.

Background technique

The power supply is an essential part of all electronic equipment and is the "power source" of the equipment. The DC regulated power supply is the most basic part of the power supply, and its performance directly affects the reliability of electronic equipment. With the continuous development of semiconductor technology and the different needs of various electronic products, a wide variety of power modules have emerged.

There are many power module products on the market at present, among which the best ones and the most used ones belong to TI's products. TI's DCP10505 is a high-efficiency 5V input DC/DC conversion power chip with output short-circuit protection and overheating shutdown functions. Its circuit block diagram is shown in Figure 1, but the synchronization of its power supply must be connected to an external one, and the degree of integrated configuration is not high.

Contents of the invention

The technical problem to be solved by the present invention is to provide an integrated DC/DC power supply front-end control system with simple circuit, high control reliability, low power consumption and better and more accurate synchronization effect.

In order to solve the above technical problems, the present invention provides an integrated DC/DC power supply front-end controller, including an oscillator module, a division and reset module, a non-overlapping clock buffer module, an output power tube module and an over-temperature protection module, which is characterized in that : the integrated DC/DC power front-end controller also includes a synchronization and clock control module, the synchronization and clock control module determines the DC/DC power front-end controller according to the signal input from the external port of the DC/DC power front-end controller Operating mode.

Preferably, the external ports of the integrated DC/DC power front-end controller include an input power supply voltage port, an enable signal port, a synchronous digital signal port, a clock input port, a clock output port, and two voltage output ports.

Preferably, the oscillator module is connected to the division and reset module, the division and reset module is connected to the synchronization and clock control module, and the synchronization and clock control module is connected to the non-overlapping clock buffer modules, so The output power tube module has two output power tubes, the non-overlapping clock buffer module is connected to the two output power tubes, one end of the over-temperature protection module is connected to the oscillator module, and the other end of the over-temperature protection module is connected to the synchronization and Clock control module.

Preferably, the power supply voltage port is connected to each module of the integrated DC/DC power front-end controller and provides working power, the enable signal port is connected to the oscillator module and the synchronization and clock control module, and the The synchronous digital signal port is connected to the oscillator module and the synchronization and clock control module, the clock input port is connected to the synchronization and clock control module, and the clock output port is connected to the synchronization and clock control module and the division With the reset module, the two voltage output ports are connected to the output power tube module.

An integrated DC/DC power front-end controller control method, including the aforementioned integrated DC/DC power front-end controller, wherein the integrated DC/DC power front-end controller includes a master working mode and a slave working mode, the The synchronization and clock control module determines the working mode of the front-end controller of the integrated DC/DC power supply according to the valid state of the input synchronous digital signal.

Preferably, when the synchronous digital signal is in an invalid state, the front-end controller of the integrated DC/DC power supply is in the main working mode, the oscillator module generates a square wave clock signal, and the clock output signal terminal outputs the clock signal; when the synchronous digital signal When it is in an effective state, the front-end controller of the integrated DC/DC power supply is in slave mode, the oscillator module stops working, and the clock signal is input from the clock input port by an external clock signal.

Preferably, when it is detected from the working mode that the clock input signal of the clock input port fails, the oscillator module starts to generate an internal clock signal.

Preferably, the two voltage output ports of the output power tube module can be connected to at least one transformer.

An integrated DC/DC power front-end control system, wherein the integrated DC/DC power front-end control system includes at least one integrated DC/DC power front-end controller, wherein one integrated DC/DC power front-end control works in the main working mode, Other integrated DC/DC power front-end controllers work in the slave mode, and the integrated DC/DC power front-end controller working in the master mode outputs a clock signal to the integrated DC/DC power front-end controller working in the slave mode.

Preferably, each integrated DC/DC power supply front-end controller is connected to a transformer, and all transformers are connected in series and parallel to output voltage; or, each integrated DC/DC power supply front-end controller is connected to a transformer, and all transformers are connected in parallel after the output voltage.

The integrated DC/DC power supply front-end control system of the present invention is composed of an integrated DC/DC power supply front-end controller. The integrated DC/DC power front-end controller has a master working mode and a slave working mode. In the slave working mode, the oscillator module is turned off, which can reduce power consumption, especially when multiple groups of integrated DC/DC power supply controllers are integrated. When powering the front-end control system, resources are saved. And realize the DC/DC conversion function of different voltage requirements by connecting one or more transformers.

Using a simple digital synchronization signal, there is no need to connect an accurate analog signal source; the synchronization is very good; it is very easy to use and connect with external devices, especially when developing power chips independently, it is easy to do different integrated configurations; high reliability. And when there is a problem with the clock output in the main working mode, the front-end controller of the integrated DC/DC power supply in the slave working mode can cut off the failed main clock autonomously and use its own internal clock.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

Fig. 1 is a functional block diagram of a power conversion chip in the prior art;

Fig. 2 is the functional block diagram of the integrated DC/DC power front-end controller of the embodiment of the integrated DC/DC power front-end control system of the present invention;

3 is a schematic diagram of the single power supply connection of the integrated DC/DC power front-end controller of the embodiment of the integrated DC/DC power front-end control system of the present invention;

Fig. 4 is a schematic diagram of the parallel power supply of the integrated DC/DC power front-end controller of the embodiment of the integrated DC/DC power supply control system of the present invention;

5 is a schematic diagram of the integrated DC/DC power front-end controller series power supply of an embodiment of the integrated DC/DC power supply control system of the present invention;

Fig. 6 is a clock sequence diagram of an embodiment of the integrated DC/DC power supply control system of the present invention.

body implementation

Example:

The present invention is an integrated DC/DC power front-end controller, wherein the integrated DC/DC power front-end controller includes an oscillator module, a division and reset module, a synchronization and clock control module, a non-overlapping clock buffer module, and an output Power tube module and over-temperature protection module.

As shown in Figure 2, in this embodiment, the oscillator module is connected to the division and reset module, the division and reset module is connected to the synchronization and clock control module, and the synchronization and clock control module is connected to the Non-overlapping clock buffer modules, the output power transistor module has two output power transistors (LDMOS), the non-overlapping clock buffer modules are connected to the two output power transistors (LDMOS), and one end of the over-temperature protection module is connected to the oscillator The other end of the over-temperature protection module is connected to the synchronization and clock control module.

In this embodiment, the integrated DC/DC power supply front-end controller includes an input power supply voltage port, an enable signal port, a synchronous digital signal port, a clock input port, a clock output port and two voltage output ports output 1 and output 2. As shown in Figure 2, the power supply voltage port is connected to each module of the integrated DC/DC power supply front-end controller and provides working power, and the enable signal terminal is connected to the oscillator module and the synchronization and clock control module , the synchronous digital signal terminal is connected to the oscillator module and the synchronization and clock control module, the clock input port is connected to the synchronization and clock control module, and the clock output port is connected to the synchronization and clock control module, The two voltage output ports are connected to the output power tube module.

The integrated DC/DC power front-end controller in the present invention includes a master working mode and a slave working mode, and the synchronization and clock control module determines the integrated DC/DC power front-end controller according to the valid state of the input synchronous digital signal working mode. The working mode of the integrated DC/D power front-end controller of this embodiment is as follows:

The oscillator module and the synchronization and clock control module are controlled by enable signal, synchronization digital signal, and clock input signal. The function of the oscillator block is to generate a square wave clock signal. The synchronization and clock control module is the core control module of the present invention, and its function is to select the circuit master/slave mode of operation; under the slave mode of operation, it can cut off the input clock that has gone wrong and use its own internal clock; when the temperature is too high , Automatically cut off the output and turn off the circuit.

The specific implementation method is as follows: when the enable signal is in an invalid state, the power supply in the circuit will be turned off. When it is turned off, the gate voltages of the two power transistors LDMOS are both at 0V; when the enable signal is in a valid state, For the normal working state of the circuit.

At this time, when the synchronous digital signal is in an invalid state, the integrated DC/DC power front-end controller is in the main working mode, and the clock output signal can be output as a clock signal and supplied to other circuits.

When the synchronous digital signal is valid, the integrated DC/DC power supply front-end controller becomes a slave mode, the oscillator will be turned off (for power saving), and the clock signal is supplied by an external clock. Entered from the clock input port.

In order to improve the reliability, if the clock input signal is detected to fail (becomes to a normal invalid state or a normal active state) in the slave working mode, the internal clock module will automatically start working, so that the chip can return to normal working state.

The clocks driving the two power transistors LDMOS must be non-overlapping clocks (Non-OverlappingClock). Such a clock signal is generated by a non-overlapping clock buffer module, and its timing is shown in Figure 6. This module includes an output buffer to drive two output power transistors. The voltage output terminals of the two output power tubes output 1 and output 2 are connected to one or more transformers in a certain connection mode, so that DC/DC conversion circuits with different output voltages can be realized.

As shown in Figure 3 is the single power supply connection diagram of the integrated DC/DC power supply front-end control system in this embodiment, wherein the integrated DC/DC power supply front-end control system includes an integrated DC/DC power supply front-end controller and a transformer connected to its voltage output terminal to obtain The output voltage Vout desired by the user.

Because the integrated DC/DC power front-end controller has two working modes, master and slave, then in the integrated DC/DC power front-end control system, a group of integrated DC/DC power front-end controllers can be used to drive all other of the slave chip clock.

Therefore, as the integrated DC/DC power front-end control system of this embodiment, it can have multiple sets of integrated DC/DC power front-ends, of which only one needs to work in the master mode, and the others can work in the slave mode.

As shown in Figure 4, the integrated DC/DC power front-end control system includes two integrated DC/DC power front-end controllers, one of which works in the master mode and the other works in the slave mode, which are connected in parallel Two transformers get twice the Vout output power (Power).

As shown in Figure 5, the integrated DC/DC power front-end control system includes three integrated DC/DC power front-end controllers, one of which works in the master mode, and the other two work in the slave mode, which are connected in series Connect the three transformers to get the output voltage of the sum of the three outputs.

The integrated DC/DC power supply front-end control system of the present invention is composed of an integrated DC/DC power supply front-end controller. The integrated DC/DC power front-end controller has a master working mode and a slave working mode. In the slave working mode, the oscillator module is turned off, which can reduce power consumption, especially when multiple groups of integrated DC/DC power supply controllers are integrated. When powering the front-end control system, resources are saved. And realize the DC/DC conversion function of different voltage requirements by connecting one or more transformers.

Using a simple digital synchronization signal, there is no need to connect an accurate analog signal source; the synchronization is very good; it is very easy to use and connect with external devices, especially when developing power chips independently, it is easy to do different integrated configurations; high reliability. And when there is a problem with the clock output in the master working mode, the front-end controller of the integrated DC/DC power supply in the slave working mode can cut off the master clock with the problem autonomously and use its own internal clock.

It should be emphasized that the protection scope of the present invention includes but is not limited to the above-mentioned specific embodiments. It should be pointed out that for those skilled in the art, some modifications and improvements can be made without departing from the principles of the present invention, and these should also be regarded as belonging to the protection scope of the present invention.

Claims (10)

1. An integrated DC/DC power supply front-end controller, comprising an oscillator module, a division and a reset module, a non-overlapping clock buffer module, an output power tube module and an overtemperature protection module, characterized in that: the integrated DC/DC The DC power front-end controller also includes a synchronization and clock control module, the synchronization and clock control module determines the working mode of the DC/DC power front-end controller according to the signal input from the external port of the DC/DC power front-end controller. 2. The integrated DC/DC power front-end controller according to claim 1, characterized in that: the external port of the integrated DC/DC power front-end controller includes an input power supply voltage port, an enable signal port, a synchronous digital signal port, A clock input port, as well as a clock output port and two voltage output ports. 3. The integrated DC/DC power supply front-end controller according to claim 2, wherein the oscillator module is connected to the division and reset module, and the division and reset module is connected to the synchronization and clock control module, The synchronization and clock control module is connected to the non-overlapping clock buffer module, the output power tube module has two output power tubes, the non-overlapping clock buffer module is connected to two output power tubes, and the overlay One end of the temperature protection module is connected to the oscillator module, and the other end of the over-temperature protection module is connected to the synchronization and clock control module. 4. The integrated DC/DC power supply front-end controller according to claim 2, characterized in that: the power supply voltage port is connected to each module of the integrated DC/DC power supply front-end controller and provides working power, and the enabling The signal port is connected to the oscillator module and the synchronization and clock control module, the synchronization digital signal port is connected to the oscillator module and the synchronization and clock control module, and the clock input port is connected to the synchronization and clock control module. module, the clock output port is connected to the synchronization and clock control module and the division and reset module, and the two voltage output ports are connected to the output power tube module. 5. An integrated DC/DC power front-end controller control method, including the integrated DC/DC power front-end controller according to claims 1-4, characterized in that: the integrated DC/DC power front-end controller includes a A master working mode and a slave working mode, the synchronization and clock control module determines the working mode of the front-end controller of the integrated DC/DC power supply according to the valid state of the input synchronous digital signal. 6. The integrated DC/DC power front-end controller control method according to claim 5, characterized in that: when the synchronous digital signal is in an invalid state, the integrated DC/DC power front-end controller is in the main mode of operation, and the oscillation The oscillator module generates a square wave clock signal, and the clock output signal port outputs the clock signal; when the synchronous digital signal is in a valid state, the front-end controller of the integrated DC/DC power supply is in slave mode, the oscillator module stops working, and the clock signal An external clock signal is input from the clock input port. 7. The integrated DC/DC power supply front-end controller control method according to claim 6, characterized in that: when the clock input signal at the clock input port is detected to be invalid, the oscillator module starts to generate an internal clock signal. 8. The integrated DC/DC power supply front-end controller control method according to claim 5, wherein the two voltage output ports of the output power tube module can be connected to at least one transformer. 9. An integrated DC/DC power front-end control system, characterized in that: the integrated DC/DC power front-end control system includes at least one integrated DC/DC power front-end controller, wherein one integrated DC/DC power front-end control works in In the main working mode, other integrated DC/DC power supply front-end controllers work in the slave working mode, and the integrated DC/DC power supply front-end controller working in the main working mode outputs clock signals to the integrated DC/DC power supply working in the slave working mode front controller. 10. The integrated DC/DC power supply front-end control system according to claim 9, characterized in that: each integrated DC/DC power supply front-end controller is connected to a transformer, and all transformers are connected in series and parallel to output voltage; or, each Each integrated DC/DC power supply front-end controller is connected to a transformer, and all transformers are connected in parallel to output voltage.