Electromagnetic induction type wireless power supply system and load sudden-change protection circuit thereof

Patent metadata

Field	Value
Publication number	US-11101645-B2
Application number	US-202016855943-A
Country	US
Kind code	B2
Filing date	Apr 22, 2020
Priority date	Oct 24, 2017
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A power supply system includes a wireless power supply end and a wireless receiving end. The wireless receiving end includes a resonant receiving component and a rectifying and voltage-stabilizing component that is connected to the resonant receiving component to output a voltage-stabilized power supply (VCC). A load sudden-change protection circuit includes an overvoltage protection component and an under-voltage protection component that are each respectively connected to the voltage-stabilized power supply and a load. The overvoltage protection component turns on the load when the voltage of the voltage-stabilized power supply is higher than a first preset voltage due to sudden turn-off of the load. The under-voltage protection component turns off the load when the voltage of the voltage-stabilized power supply is lower than a second preset voltage due to sudden turn-on of the load.

First claim

What is claimed is:

1. A load sudden-change protection circuit, comprising:
an overvoltage protection component; and
an under-voltage protection component, wherein the load sudden-change protection circuit is configured to be connected between an electromagnetic induction type wireless power supply system and a load,
wherein the electromagnetic induction type wireless power supply system includes a wireless power supply end and a wireless receiving end, the wireless receiving end includes a resonant receiving component and a rectifying and voltage-stabilizing component connected to the resonant receiving component, the rectifying and voltage-stabilizing component processes electric energy received by the resonant receiving component to output a voltage-stabilized power supply Voltage Common Collector (VCC),
wherein the overvoltage protection component is connected to the voltage-stabilized power supply VCC and the load, and the overvoltage protection component is configured to turn on the load when a voltage of the voltage-stabilized power supply VCC is higher than a first preset voltage due to sudden turn-off of the load; and
wherein the under-voltage protection component is connected to the voltage-stabilized power supply VCC and the load, and the under-voltage protection component is configured to turn off the load when the voltage of the voltage-stabilized power supply VCC is lower than a second preset voltage due to sudden turn-on of the load.

2. The load sudden-change protection circuit of claim 1 , wherein the overvoltage protection component includes:
a first voltage-stabilizing zener diode, a cathode of the first voltage-stabilizing zener diode being connected to positive electrode ends of the voltage-stabilized power supply VCC and the load;
a first resistor, a first end of the first resistor being connected to an anode of the first voltage-stabilizing zener diode; and
a first BJT, a base electrode of the first BJT being connected to a second end of the first resistor, an emitter electrode of the first BJT being grounded, and a collector electrode of the first triode BJT being connected to a negative electrode end of the load.

3. The load sudden-change protection circuit of claim 2 , wherein the under-voltage protection component includes:
a second voltage-stabilizing zener diode, a cathode of the second voltage-stabilizing zener diode being connected to positive electrode ends of the voltage-stabilized power supply VCC and the load;
a second resistor, a first end of the second resistor being connected to an anode of the second voltage-stabilizing zener diode;
a second BJT, a base electrode of the second BJT being connected to a second end of the second resistor, and an emitter electrode of the second BJT being grounded; and
a third BJT, an emitter electrode of the third BJT being connected to a collector electrode of the second BJT, a collector electrode of the third BJT being connected to a negative electrode end of the load, and a base electrode B of the third BJT being connected to a main control chip of the wireless receiving end through a third resistor, wherein the third BJT is turned on or off under the control of the main control chip of the wireless receiving end.

4. The load sudden-change protection circuit of claim 1 , wherein the resonant receiving component includes:
a wireless receiving coil, the wireless receiving coil being matched with a wireless transmitting coil of the wireless power supply end, and the wireless receiving coil being electromagnetically coupled with the wireless transmitting coil so as to ensure that electric energy is transmitted between the wireless power supply end and the wireless receiving end; and
a first resonant capacitor and a second resonant capacitor, a first end of the first resonant capacitor being connected to a first end of the wireless receiving coil, a second end of the first resonant capacitor being connected to a first end of the second resonant capacitor and being provided with a first node, and a second end of the second resonant capacitor being connected to a second end of the wireless receiving coil and being provided with a second node.

5. The load sudden-change protection circuit of claim 4 , wherein the rectifying and voltage-stabilizing component includes a rectifier bridge and a voltage-stabilizing circuit, a first input end of the rectifier bridge is connected to the first node, a second input end of the rectifier bridge is connected to the second node, a first output end of the rectifier bridge is connected to the voltage-stabilizing circuit, and a second output end of the rectifier bridge is grounded.

6. The load sudden-change protection circuit of claim 5 , wherein the voltage-stabilizing circuit includes:
a first electrolytic capacitor, a positive electrode end of the first electrolytic capacitor being connected to the first output end of the rectifier bridge, and a negative electrode end of the first electrolytic capacitor being grounded;
a fourth resistor, one end of the fourth resistor being connected to a positive electrode end of the first electrolytic capacitor and being provided with a third node, wherein the voltage-stabilizing circuit outputs the voltage-stabilized power supply VCC through the third node;
a fifth resistor, a first end of the fifth resistor being connected to a second end of the fourth resistor, and a second end of the fifth resistor being grounded; and
a first capacitor, the first capacitor being connected in parallel to the fifth resistor.

7. The load sudden-change protection circuit of claim 4 , wherein the wireless receiving end includes a communication demodulation circuit and a communication modulation circuit, the communication demodulation circuit is connected between the main control chip and a second end of the wireless receiving coil, the communication modulation circuit is connected between the main control chip and a first end of the wireless receiving coil, the main control chip receives communication information transmitted by the wireless power supply end through the wireless receiving coil and the communication demodulation circuit and transmits the communication information to the wireless power supply end through the communication modulation circuit and the wireless receiving coil.

8. An electromagnetic induction type wireless power supply system, comprising:
a wireless power supply end;
a wireless receiving end; and
a load sudden-change protection circuit, including an overvoltage protection component and an under-voltage protection component, wherein:
the wireless receiving end includes a resonant receiving component and a rectifying and voltage-stabilizing component connected to the resonant receiving component, the rectifying and voltage-stabilizing component processes electric energy received by the resonant receiving component to output a voltage-stabilized power supply Voltage Common Collector (VCC),
the overvoltage protection component is connected to the voltage-stabilized power supply VCC and a load, and the overvoltage protection component is configured to turn on the load when a voltage of the voltage-stabilized power supply VCC is higher than a first preset voltage due to sudden turn-off of the load, and
the under-voltage protection component is connected to the voltage-stabilized power supply VCC and the load, and the under-voltage protection component is configured to turn off the load when the voltage of the voltage-stabilized power supply VCC is lower than a second preset voltage due to sudden turn-on of the load.

9. The electromagnetic induction type wireless power supply system of claim 8 , wherein the overvoltage protection component includes:
a first voltage-stabilizing zene

Assignees

• Foshan Shunde Midea Electrical Heating Appliances Mfg Co Ltd

Inventors

• Zhang Fan
• Wang Yunfeng
• Zeng Lutian
• Liu Wenhua
• Huang Shufeng
• Lei Jun
• Jiang Deyong

Classifications

• H02H9/04 Primary

  responsive to excess voltage (lightning arrestors H01C7/12, H01C8/04, H01G9/18, H01T) · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H05B6/06

  Control, e.g. of temperature, of power · CPC title

• H02J50/80

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H02H7/1227

  responsive to abnormalities in the output circuit, e.g. short circuit · CPC title