Power continuation control circuit

Patent metadata

Field	Value
Publication number	US-10483794-B2
Application number	US-201715635209-A
Country	US
Kind code	B2
Filing date	Jun 28, 2017
Priority date	Jun 28, 2017
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A power continuation control circuit includes a power supply circuit, a detection circuit, an energy storage circuit, a switch module, and a control circuit. The detection circuit is coupled to the power supply circuit. The switch module is coupled to the energy storage circuit. The control circuit is coupled to the switch module and the detection circuit. The power supply output terminal is coupled to the control circuit and the power supply circuit.

First claim

What is claimed is:

1. A power continuation control circuit comprising:
a power supply circuit configured to output a preset voltage;
a detection circuit coupled to the power supply circuit, and configured to obtain the voltage outputted by the power supply circuit to determine whether the power supply circuit is powered normally;
an energy storage circuit configured to store energy;
a switch module coupled to the energy storage circuit, wherein the switch module comprises a first electronic switch and a second electronic switch;
a control circuit coupled to the switch module and the detection circuit, and configured to output a first square wave signal with a first preset duty ratio according to a first signal outputted by the detection circuit, to control the first electronic switch and the second electronic switch to turn on or off resulting in that the energy storage circuit stores energy, and further configured to output a second square wave signal with a second preset duty ratio according to a second signal outputted by the detection circuit, to control the first electronic switch and the second electronic switch to turn on or off resulting in that the energy storage circuit supplies energy, wherein the control circuit comprises:
a DC voltage output unit coupled to the detection circuit, and configured to output a first voltage signal when the first signal is outputted by the detection circuit, and further configured to output a second voltage signal when the second signal is outputted by the detection circuit;
a triangle wave generator configured to produce a triangular wave with preset amplitude and frequency; and
a voltage comparison unit coupled to the triangle wave generator and the DC voltage output unit, and configured to compare one of the first voltage signal and the second voltage signal outputted by the DC voltage output unit with the triangular wave, and further configured to output the square wave signal of the first preset duty ratio according the first voltage signal or the square wave signal of the second preset duty ratio according to the second voltage signal; and

a power supply output terminal coupled to the control circuit and the power supply circuit, and configured to supply power to an external device.

2. The power continuation control circuit of claim 1 , wherein the voltage comparison unit comprises a first voltage comparator, and the DC voltage output unit comprises:
a first resistor with a first resistor first terminal and a first resistor second terminal, wherein the first resistor first terminal is coupled to the detection circuit;
a first DC voltage source; and
a second resistor with a second resistor first terminal and a second resistor second terminal, wherein the second resistor first terminal is coupled to the first resistor second terminal, and the second resistor second terminal is coupled to a positive electrode of the first DC voltage source.

3. The power continuation control circuit of claim 2 , wherein the control circuit further comprises:
a first detection circuit coupled to the first voltage comparator positive input terminal, and configured to detect a voltage value of the power supply output terminal and to adjust the voltage value of the first voltage comparator positive input terminal according to a change of the voltage value of the power supply output terminal.

4. The power continuation control circuit of claim 3 , wherein the first detection circuit comprises:
a third resistor with a third resistor first terminal and a third resistor second terminal, wherein the third resistor first terminal is coupled to the power supply output terminal;
a fourth resistor with a fourth resistor first terminal and a fourth resistor second terminal, wherein the fourth resistor first terminal is coupled to the third resistor second terminal, and the fourth resistor second terminal is coupled to the ground;
a second DC voltage source;
a second voltage comparator with a second voltage comparator positive input terminal, a second voltage comparator reverse input terminal and a second voltage comparator output terminal, the second voltage comparator positive input terminal coupled to the fourth resistor first terminal, the second voltage comparator reverse input terminal coupled to a positive electrode of the second DC voltage source; and
a fifth resistor with a fifth resistor first terminal and a fifth resistor second terminal, the fifth resistor first terminal coupled to the second voltage comparator output terminal, the fifth resistor second terminal coupled to the first voltage comparator positive input terminal.

5. The power continuation control circuit of claim 4 , wherein the resistance value of the second resistor is smaller than the resistance value of the fifth resistor.

6. The power continuation control circuit of claim 1 , wherein the energy storage circuit comprises:
an inductor with an inductor first terminal and an inductor second terminal coupled to the switch module; and
a capacitor with a capacitor first terminal coupled to the inductor first terminal, and a capacitor second terminal coupled to the ground.

7. A power continuation control circuit comprising:
a power supply circuit configured to output a preset voltage;
a detection circuit coupled to the power supply circuit, and configured to obtain the preset voltage outputted by the power supply circuit to determine whether the power supply circuit is powered normally;
an energy storage circuit configured to store energy;
a switch module coupled to the energy storage circuit, wherein the switch module comprises a first electronic switch and a second electronic switch;
a control circuit coupled to the switch module and the detection circuit, and configured to output a first square wave signal with a first preset duty ratio according to a first signal outputted by the detection circuit, to control the first electronic switch and the second electronic switch to turn on or off resulting in that the energy storage circuit stores energy, and further configured to output a second square wave signal with a second preset duty ratio according to a second signal outputted by the detection circuit, to control the first electronic switch and the second electronic switch to turn on or off resulting in that the energy storage circuit supplies energy; and
a power supply output terminal coupled to the control circuit and the power supply circuit, and configured to supply power to an external device, wherein the detection circuit comprises:
a diode;
a third voltage comparator with a third voltage comparator positive input terminal, a third voltage comparator reverse input terminal and a third voltage comparator output terminal, configured to judge whether the power supply circuit is powered normally according to a voltage difference between a voltage value of an anode of the diode and a voltage value of a cathode of the diode
a second detection circuit comprises a second detection circuit first terminal and a second detection circuit second terminal, the second detection circuit first terminal coupled to the anode of the diode, the second detection circuit second terminal coupled to the third voltage comparator reverse input terminal, and configured to detect the voltage value of the anode of the diode; and
a third detection circuit comprises a third detection circuit first terminal and a third detection circuit second terminal the third detection circuit first terminal coupled to the cathode of the diode, the third detection circuit second terminal coupled to the third voltage comparator positive input terminal, and configured to detect the voltage value of the cathode of the diode.

8. The power continuation control circuit of claim 7 , whe

Assignees

• Nanning Fugui Prec Ind Co Ltd

Inventors

• Wang Yi-Feng

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• H02J9/061 Primary

  for DC powered loads · CPC title

• H03K4/06

  having triangular shape · CPC title

• H02J9/06 Primary

  with automatic change-over {, e.g. UPS systems} · CPC title