Inrush current test device

Patent metadata

Field	Value
Publication number	US-10983149-B2
Application number	US-201916690463-A
Country	US
Kind code	B2
Filing date	Nov 21, 2019
Priority date	Sep 6, 2019
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

An inrush current test device is adapted to receive an alternating current. The inrush current test device includes: a first isolation coupling component, a positive crossing point pulse generation circuit, an output circuit, and a control circuit. The first isolation coupling component includes a primary side and a secondary side, and is responsive to the alternating current on the primary side and conducts the secondary side. When the secondary side transits from an off state to an on state, the positive crossing point pulse generation circuit generates a positive crossing point pulse. When the control circuit is actuated and the positive crossing point pulse is detected, after delaying for a delay time, the control circuit outputs a control pulse for actuating the output circuit for a first operating time. The output circuit is configured to receive the alternating current and output the alternating current when the output circuit is actuated.

First claim

What is claimed is:

1. An inrush current test device, adapted to receive an alternating current, comprising:
a first isolation coupling component, comprising a primary side and a secondary side, wherein the first isolation coupling component is responsive to a positive half-cycle potential of the alternating current on the primary side and conducts the secondary side;
a positive crossing point pulse generation circuit, coupled to the first isolation coupling component and configured to generate a positive crossing point pulse when the secondary side transits from an off state to an on state;
an output circuit, configured to receive the alternating current and output the alternating current when the output circuit is actuated; and
a control circuit, coupled to the positive crossing point pulse generation circuit and the output circuit, wherein when the control circuit is actuated and the positive crossing point pulse is detected, after delaying for a delay time, the control circuit outputs a control pulse for actuating the output circuit for a first operating time.

2. The inrush current test device according to claim 1 , further comprising: a wire detection circuit, configured to output an auxiliary signal, the alternating current comprising a live wire end, a zero line end, and a ground wire end, wherein one end of the wire detection circuit is coupled to the ground wire end, the auxiliary signal is a first indication signal when the other end of the wire detection circuit is coupled to the live wire end, and the auxiliary signal is a second indication signal when the other end of the wire detection circuit is coupled to the zero line end.

3. The inrush current test device according to claim 1 , wherein the positive crossing point pulse generation circuit comprises:
a level generation circuit, coupled to the secondary side and configured to generate a low level when the secondary side is conducted and provide a high level when the secondary side is disconnected, the low level and the high level constituting a level signal;
an inverter circuit, coupled to the control circuit and comprising a first inverter and a resistor, wherein the first inverter outputs a low potential signal when a potential of the resistor is higher than a first threshold, and outputs a high potential signal when the potential of the resistor is not higher than the first threshold, the low potential signal and the high potential signal constituting the positive crossing point pulse;
a charge and discharge circuit, coupled to the level generation circuit and configured to charge the resistor when the level generation circuit generates the high level and discharge to the resistor when the level generation circuit generates the low level, so as to generate the potential of the resistor; and
a switch circuit, coupled to the level generation circuit, the charge and discharge circuit, and the inverter circuit, and configured to cut off the coupling between the charge and discharge circuit and the resistor when the level generation circuit generates the high level.

4. The inrush current test device according to claim 3 , further comprising: a wire detection circuit, configured to output an auxiliary signal, the alternating current comprising a live wire end, a zero line end, and a ground wire end, wherein one end of the wire detection circuit is coupled to the ground wire end, the auxiliary signal is a first indication signal when the other end of the wire detection circuit is coupled to the live wire end, and the auxiliary signal is a second indication signal when the other end of the wire detection circuit is coupled to the zero line end.

5. The inrush current test device according to claim 3 , wherein the switch circuit comprises:
a first switch, coupled between the charge and discharge circuit and the inverter circuit and comprising a first control end, wherein the first switch is configured to cut off the coupling between the charge and discharge circuit and the resistor when the level signal is at the high level and switch on the coupling between the charge and discharge circuit and the resistor when the level signal is at the low level; and
a delay circuit, coupled between the level generation circuit and the first control end, wherein the delay circuit is configured to delay a first response time, the first response time being a time which the level signal controls the first switch.

6. The inrush current test device according to claim 5 , further comprising: a wire detection circuit, configured to output an auxiliary signal, the alternating current comprising a live wire end, a zero line end, and a ground wire end, wherein one end of the wire detection circuit is coupled to the ground wire end, the auxiliary signal is a first indication signal when the other end of the wire detection circuit is coupled to the live wire end, and the auxiliary signal is a second indication signal when the other end of the wire detection circuit is coupled to the zero line end.

7. The inrush current test device according to claim 5 , wherein the delay circuit is a second inverter.

8. The inrush current test device according to claim 7 , further comprising: a wire detection circuit, configured to output an auxiliary signal, the alternating current comprising a live wire end, a zero line end, and a ground wire end, wherein one end of the wire detection circuit is coupled to the ground wire end, the auxiliary signal is a first indication signal when the other end of the wire detection circuit is coupled to the live wire end, and the auxiliary signal is a second indication signal when the other end of the wire detection circuit is coupled to the zero line end.

9. The inrush current test device according to claim 3 , wherein the charge and discharge circuit comprises:
another resistor, coupled to a direct-current power supply;
a capacitor, adapted to operate in a charge state and a discharge state; and
a second switch, coupled between the another resistor and the capacitor and comprising a second control end, wherein the second control end is coupled to the level generation circuit, and the second switch is configured to switch on the coupling between the capacitor and the another resistor when the level signal is at the high level to cause the capacitor to operate in the charge state, and cut off the coupling between the capacitor and the another resistor when the level signal is at the low level to cause the capacitor to operate in the discharge state.

10. The inrush current test device according to claim 9 , further comprising: a wire detection circuit, configured to output an auxiliary signal, the alternating current comprising a live wire end, a zero line end, and a ground wire end, wherein one end of the wire detection circuit is coupled to the ground wire end, the auxiliary signal is a first indication signal when the other end of the wire detection circuit is coupled to the live wire end, and the auxiliary signal is a second indication signal when the other end of the wire detection circuit is coupled to the zero line end.

11. The inrush current test device according to claim 1 , wherein the control circuit comprises: a phase determining circuit, configured to provide a reference phase to the control circuit, the control circuit adjusts the delay time according to the reference phase, the phase determining circuit comprises a fourth switch, and the reference phase is a first phase when the fourth switch is on and the reference phase is a second phase when the fourth switch is off.

12. The inrush current test device according to claim 11 , further comprising: a wire detection circuit, configured to output an auxiliary signal

Assignees

• Chicony Power Tech Co Ltd

Inventors

• Hsiao Jen-Hao

Classifications

• H02H3/093

  with timing means {(in general H02H3/027; thermal delay H02H3/085; timing means for undervoltage protection H02H3/247)} · CPC title

• G01R19/0092 Primary

  Measuring current only · CPC title

• G01R19/16547 Primary

  voltage or current in AC supplies (switching for protection H02H; circuits for emergency power supply H02J9/00) · CPC title

• G01R1/28

  Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform · CPC title

• G01R1/36

  Overload-protection arrangements or circuits for electric measuring instruments · CPC title