US 2014/0176114 A1Published application

Time sequence circuit for power supply unit

AssigneesHon Hai Precision Industry Co., Ltd., HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD.

InventorHAI-QING ZHOU

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Abstract

A time sequence circuit for a power supply unit includes first through tenth resistors, first and second electronic switches, first through fourth diodes, and a capacitor. Each of the first and second electronic switches includes first through third terminals. When the power supply unit outputs all voltages, the power supply unit outputs a high-voltage level power good signal. If one of the voltages is not outputted, the power supply unit outputs a low-voltage level power good signal.

Claims3

Dependent claims

A time sequence circuit, comprising:

a first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth resistor;
a first and a second electronic switch each comprising a first, second, and third terminal;
a first, second, third, and fourth diode;
and
a capacitor;
wherein a cathode of the first diode is coupled to a first power terminal through the first resistor, and is connected to ground through the second resistor;
an anode of the first diode is coupled to a second power terminal through the third resistor, the anode of the first diode is coupled to the first terminal of the first electronic switch;
a cathode of the second diode is coupled to a third power terminal through the fourth resistor, and is connected to ground through the fifth resistor;
an anode of the second diode is coupled to the first terminal of the first electronic switch;
a cathode of the third diode is coupled to a fourth power terminal through the sixth resistor, and is connected to ground through the seventh resistor;
an anode of the third diode is coupled to the first terminal of the first electronic switch;
the second terminal of the first electronic switch is connected to ground, the third terminal of the first electronic switch is coupled to the second power terminal through the eighth resistor, and is connected to the first terminal of the second electronic switch through the ninth resistor;
the first terminal of the second electronic switch is coupled to a cathode of the fourth diode, an anode of the fourth diode receives a power on signal;
the second terminal of the second electronic switch is connected to ground, the third terminal of the second electronic switch is coupled to the third power terminal through the tenth resistor, the third terminal of the second electronic switch is connected to ground through the capacitor, the third terminal of the second electronic switch is used to output a power good signal;
when the first terminals of the first and second electronic switches are at low-voltage level, the first and second terminals of each electronic switch are disconnected from each other;
when the first terminals of the first and second electronic switches are at high-voltage level, the first and second terminals of each electronic switch are connected to each other.

13 more elements

Dependencies are inferred from the claim text.

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Abstract

A time sequence circuit, comprising:

a first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth resistor;
a first and a second electronic switch each comprising a first, second, and third terminal;
a first, second, third, and fourth diode;
and
a capacitor;
wherein a cathode of the first diode is coupled to a first power terminal through the first resistor, and is connected to ground through the second resistor;
an anode of the first diode is coupled to a second power terminal through the third resistor, the anode of the first diode is coupled to the first terminal of the first electronic switch;
a cathode of the second diode is coupled to a third power terminal through the fourth resistor, and is connected to ground through the fifth resistor;
an anode of the second diode is coupled to the first terminal of the first electronic switch;
a cathode of the third diode is coupled to a fourth power terminal through the sixth resistor, and is connected to ground through the seventh resistor;
an anode of the third diode is coupled to the first terminal of the first electronic switch;
the second terminal of the first electronic switch is connected to ground, the third terminal of the first electronic switch is coupled to the second power terminal through the eighth resistor, and is connected to the first terminal of the second electronic switch through the ninth resistor;
the first terminal of the second electronic switch is coupled to a cathode of the fourth diode, an anode of the fourth diode receives a power on signal;
the second terminal of the second electronic switch is connected to ground, the third terminal of the second electronic switch is coupled to the third power terminal through the tenth resistor, the third terminal of the second electronic switch is connected to ground through the capacitor, the third terminal of the second electronic switch is used to output a power good signal;
when the first terminals of the first and second electronic switches are at low-voltage level, the first and second terminals of each electronic switch are disconnected from each other;
when the first terminals of the first and second electronic switches are at high-voltage level, the first and second terminals of each electronic switch are connected to each other.

13 more elements