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公开(公告)号：US20240353880A1
公开(公告)日：2024-10-24
申请号：US18305960
申请日：2023-04-24
发明人： Bradford Hunter
摘要： An example cascode voltage regulator circuit includes a first transistor coupled to an input voltage terminal and configured as a source follower to provide an output voltage at a source terminal, a second transistor coupled in series between the source terminal of the first transistor and an output terminal, the second transistor configured as a current limiter, and a current mirror coupled between respective first and second control terminals of the first and second transistors, the current mirror configured to receive a first current indicative of a source follower current flowing through the first transistor and to turn off the second transistor by coupling the first and second control terminals together responsive to the source follower current exceeding a threshold. In an example, the first transistor is a drain-extended NMOS device and the second transistor is a drain-extended PMOS device.
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公开(公告)号：US20240231401A1
公开(公告)日：2024-07-11
申请号：US17596242
申请日：2021-05-24
发明人： Kenji MII , Kohji YOSHII
CPC分类号： G05F1/5735 , G05F1/575
摘要： A constant voltage generator circuit includes a first amplifier circuit that drives a transistor controlling an output current based on a reference voltage; a second amplifier circuit that drives the transistor based on the reference voltage from the power source; a protection circuit that limit an output current flowing through the load from the transistor; and a control circuit that controls operation of the second amplifier circuit. The control circuit controls the second amplifier circuit to operate or not to operate based on a relationship between the output current and predetermined first or second threshold. The second amplifier circuit further includes a first operation voltage potential fixing circuit that fixes an operation voltage potential of an internal node of the second amplifier circuit during non-operation thereof.
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公开(公告)号：US20240012437A1
公开(公告)日：2024-01-11
申请号：US18028935
申请日：2020-09-29
IPC分类号： G05F1/573 , H03K17/081 , G05F1/571
CPC分类号： G05F1/5735 , H03K17/08104 , G05F1/571 , H03K2217/0081 , G06F1/30
摘要： The present disclosure presents a current limiter, a method of operating the same, and a hotswap module comprising the same. The current limiter comprises: a current limiting module having an input terminal, an output terminal, and a control terminal, and configured to limit a current, which is input via its input terminal, within a current limiting range; and a range controlling module having a control terminal coupled top the control terminal of the current limiting module and a sensing terminal coupled to the output terminal of the current limiting module, and configured to generate a control signal at least based on the current which is output via the output terminal of the current limiting module and which is sensed at the sensing terminal, and output the control signal via its control terminal, such that the current limiting range is dynamically adjustable based on the control signal.
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公开(公告)号：US11768510B2
公开(公告)日：2023-09-26
申请号：US17458048
申请日：2021-08-26
申请人： Kohei Sakurai , Shinichiro Maki
发明人： Kohei Sakurai , Shinichiro Maki
摘要： A power supply semiconductor IC includes: an output transistor connected between a voltage-input terminal and a voltage-output terminal; a control circuit that controls the output transistor based on a feedback voltage of an output voltage; a current-limit circuit that limits an output current of the output transistor such that the output current is not equal to or greater than a current limit; a first transistor constituting a current-mirror circuit with the output transistor; a short-circuit-fault detection circuit that detects a short circuit of the voltage-output terminal based on a voltage across a resistor connected in series to the first transistor; and a first output terminal that outputs a detection result of the short-circuit-fault detection circuit. The current limit is within a detection range of the short-circuit-fault detection circuit. The short-circuit-fault detection circuit detects a short circuit of the voltage-output terminal even while the current limit circuit limits the output current.
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公开(公告)号：US11695406B2
公开(公告)日：2023-07-04
申请号：US17453903
申请日：2021-11-08
申请人： ABLIC Inc.
发明人： Kaoru Sakaguchi
IPC分类号： G05F1/573 , H03K17/082 , H02H3/08
CPC分类号： H03K17/0822 , G05F1/573 , H02H3/08 , H03K17/082
摘要： An overcurrent protection circuit configured to limit an output current flowing through an output transistor includes a sense transistor that provides a sense current proportional to the output current, a sense resistor through which the sense current flows, a current limiting circuit that detects a sense voltage generated by the sense resistor and controls a gate voltage of the output transistor, and a current correction circuit that provides the sense resistor with a corrected sense current added to the sense current based on a difference of voltage between a drain voltage of the output transistor and a drain voltage of the sense transistor.
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公开(公告)号：US11602022B2
公开(公告)日：2023-03-07
申请号：US17132961
申请日：2020-12-23
发明人： Dennis Mulders
IPC分类号： H05B45/12 , H05B45/14 , H05B45/345 , H05B47/25 , G05F1/573 , G05F1/565 , G05F1/569 , H05B6/12 , H05B41/285
摘要： A circuit comprises an optical coupling including an illuminator optically coupled to an optical sensor to output a voltage from the optical sensor based on intensity of illumination from the illuminator. The circuit includes a voltage input node with a resistance connected in series between the voltage input and a Zener diode. A method includes powering an illuminator with current from a first voltage input node. The method includes sensing illumination level in illumination from the illuminator with a sensor and outputting output proportionate to illumination sensed by the sensor indicative of voltage detected at the voltage input node. The method can include limiting current between the voltage input node and the illuminator.
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公开(公告)号：US11599133B2
公开(公告)日：2023-03-07
申请号：US17374228
申请日：2021-07-13
发明人： Shatabda Saha
摘要： Disclosed is a power supply that automatically switches between a voltage regulation mode and an over current protection mode, as needed. The power supply includes a voltage regulator that generates a first control voltage for applying to the control terminal of a pass transistor during a voltage regulation mode to maintain an output voltage at a desired voltage level. The power supply includes a current limiter that generates a second control voltage for applying to the control terminal of the pass transistor during an over current protection mode to prevent an output current from rising above a maximum output current limit. The power supply includes additional circuitry that detects when over current protection is required and automatically switches the control voltage applied to the control terminal from the first control voltage to the second control voltage or vice versa, as necessary. Also disclosed is an associated power supply method.
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公开(公告)号：US20230020570A1
公开(公告)日：2023-01-19
申请号：US17865552
申请日：2022-07-15
发明人： Takayoshi FUJINO
摘要： An operational amplifier operates upon receiving supply of a first voltage and outputs a control voltage on the basis of a reference voltage. A first output transistor has a first electrode connected to a first voltage line that is a supply line for the first voltage; the first output transistor transmits a first current on the basis of the control voltage. An overcurrent protection circuit is connected to the operational amplifier, and includes a resistance unit for adjustment of a temperature coefficient.
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公开(公告)号：US20220158436A1
公开(公告)日：2022-05-19
申请号：US17592807
申请日：2022-02-04
申请人： Rohm Co., Ltd.
发明人： Toru Takuma , Shuntaro Takahashi , Naoki Takahashi
摘要： An overcurrent protection circuit includes a current control part configured to control conductance of a transistor so as to limit an output current flowing when the transistor is turned on to a predetermined upper limit or less, and a duty control part configured to forcibly turning on/off the transistor at a predetermined duty ratio when a temperature protection circuit detects a temperature abnormality in a state where the current control part limits the output current.
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公开(公告)号：US11323067B2
公开(公告)日：2022-05-03
申请号：US17235270
申请日：2021-04-20
发明人： Masafumi Nakatani , Hiroki Murakami
IPC分类号： H03B5/04 , G05F3/26 , H03K3/0232 , H03K3/011 , H03K3/0231 , G05F1/573 , H03K5/135 , G05F1/56
摘要： The present invention provides an oscillator circuit and a semiconductor integrated circuit, which can suppress the upper limit of the frequency of a clock signal due to an error of the constant current circuit. The oscillator circuit of the present invention includes a constant current circuit, an oscillator, and a current limiting circuit. The constant current circuit generates a first output current according to a supply voltage. The current limiting circuit receives the first output current and generates a second output current, and establishes an upper limit for the second output current when the supply voltage drops below a lower limit of a guaranteed operational range of the constant current circuit. The oscillator generates a clock signal according to the second output current. By establishing the upper limit for the second output current, the upper limit of the frequency of the clock signal can be suppressed.
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