Dual mode power supply controller with current regulation
First Claim
Patent Images
1. A power conversion circuit, comprising:
- a voltage boost circuit including a boost inductor and being configured to generate an output voltage in response to an input voltage;
a boost controller configured to control operation of the voltage boost circuit;
wherein the boost controller is configured to control operation of the voltage boost circuit in response to a level of current in the boost inductor;
wherein the boost controller is configured to control a pulse width modulation signal that is supplied to the voltage boost circuit in response to a level of a load current by generating an error signal in response to the load current, wherein the error signal is a function of a difference between an actual load current and a target load current;
wherein the boost controller is further configured to generate a first, current (ICS) that is representative of the current in the boost inductor, to generate a current sense signal (VICS) in response to the first current, to compare the current sense signal to a threshold voltage, and to change a state of the pulse width modulation signal in response to the current sense signal reaching the threshold voltage; and
wherein the boost controller is further configured to generate a comparison signal in response to the load current, to generate a feedforward voltage signal in response to a feedforward signal (IFF) that is representative of a level of a rectified input voltage signal, to multiply the comparison signal by the feedforward signal to obtain an error signal, and to compare the current sense signal to the error signal.
3 Assignments
0 Petitions
Accused Products
Abstract
A power conversion circuit includes a voltage boost circuit including a boost inductor configured to generate an output voltage in response to an input voltage, and a boost controller configured to control operation of the voltage boost circuit. The boost controller is configured to control operation of the voltage boost circuit in response to a level of current in the boost inductor.
27 Citations
28 Claims
-
1. A power conversion circuit, comprising:
-
a voltage boost circuit including a boost inductor and being configured to generate an output voltage in response to an input voltage; a boost controller configured to control operation of the voltage boost circuit; wherein the boost controller is configured to control operation of the voltage boost circuit in response to a level of current in the boost inductor; wherein the boost controller is configured to control a pulse width modulation signal that is supplied to the voltage boost circuit in response to a level of a load current by generating an error signal in response to the load current, wherein the error signal is a function of a difference between an actual load current and a target load current; wherein the boost controller is further configured to generate a first, current (ICS) that is representative of the current in the boost inductor, to generate a current sense signal (VICS) in response to the first current, to compare the current sense signal to a threshold voltage, and to change a state of the pulse width modulation signal in response to the current sense signal reaching the threshold voltage; and wherein the boost controller is further configured to generate a comparison signal in response to the load current, to generate a feedforward voltage signal in response to a feedforward signal (IFF) that is representative of a level of a rectified input voltage signal, to multiply the comparison signal by the feedforward signal to obtain an error signal, and to compare the current sense signal to the error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A power conversion circuit, comprising:
-
a voltage boost circuit including a boost inductor and being configured to generate an output voltage in response to an input voltage; and a boost controller configured to control operation of the voltage boost circuit; wherein the boost controller is configured to control operation of the voltage boost circuit in response to a level of current in the boost inductor, and wherein the boost controller is configured to control a pulse width modulation signal that is supplied to the voltage boost circuit in response to a level of a load current by generating an error signal in response to the load current, wherein the error signal is a function of a difference between an actual load current and a target load current; wherein the boost controller is further configured to generate a first current (ICS) that is representative of the current in the boost inductor, to generate a current sense signal (VICS) in response to the first current, to compare the current sense signal to a threshold voltage, and to change a state of the pulse width modulation signal in response to the current sense signal reaching the threshold voltage; wherein the boost controller is further configured to generate a second current (IHYS), to add the first current (ICS) to the second current to generate a combined current (IHYS+ICS), to generate a combined voltage signal in response to the combined current, to compare the combined voltage signal to the threshold voltage; and wherein the boost controller is configured to change a state of the pulse width modulation signal to a first state in response to the current sense signal exceeding the threshold voltage and to change the state of the pulse width modulation signal to a second state in response to the combined voltage signal falling below the threshold voltage.
-
-
10. A power conversion circuit, comprising:
-
a voltage boost circuit including a boost inductor and being configured to generate an output voltage in response to an input voltage; and a boost controller configured to control operation of the voltage boost circuit; wherein the boost controller is configured to control operation of the voltage boost circuit in response to a level of current in the boost inductor, wherein the boost controller is further configured to generate a first current (ICS) that is representative of the current in the boost inductor, to generate a current sense signal (VICS) in response to the first current, to compare the current sense signal to a threshold voltage, and to change a state of the pulse width modulation signal in response to the current sense signal reaching the threshold voltage; wherein the boost controller is further configured to generate a second current (IHYS), to add the first current (ICS) to the second current to generate a combined current (IHYS+ICS), to generate a combined voltage signal in response to the combined current, and to compare the combined voltage signal to the threshold voltage; and wherein the boost controller is configured to set the pulse width modulation signal to a first voltage level in response to the combined voltage signal falling below the threshold voltage and to reset the pulse width modulation signal to a second voltage level in response to the current sense signal rising above the threshold voltage. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method of operating a power conversion circuit including a voltage boost circuit having a boost inductor, the method comprising:
-
receiving an input voltage; and controlling operation of the voltage boost circuit in response to a level of current in the boost inductor and in response to a level of a load current by comparing the level of current in the boost inductor to a threshold level, and changing a state of a pulse width modulation signal that is supplied to the voltage boost circuit in response to the level of current in the boost inductor reaching the threshold level; wherein controlling operation of the voltage boost circuit comprises; generating a first current (ICS) that is representative of the current in the boost inductor, generating a current sense signal (VICS) in response to the first current, comparing the current sense signal to a threshold voltage, and changing a state of the pulse width modulation signal in response to the comparison; and generating a second current (IHYS), wherein the second current (IHYS) comprises a hysteretic signal that corresponds to a hysteresis window within which the current in the boost inductor can fluctuate, adding the first current (ICS) to the second current to generate a combined current (IHYS+ICS), generating a combined voltage signal in response to the combined current, and comparing the combined voltage signal to the threshold voltage. - View Dependent Claims (21, 22)
-
-
23. A method of operating a power conversion circuit including a voltage boost circuit having a boost inductor, the method comprising:
-
receiving an input voltage; controlling operation of the voltage boost circuit in response to a level of current in the boost inductor, generating a first current (ICS) that is representative of the current in the boost inductor, generating a current sense signal (VICS) in response to the first current, comparing the current sense signal to a threshold voltage, and changing a state of the pulse width modulation signal in response to the comparison; generating a second current (IHYS), adding the first current (ICS) to the second current to generate a combined current (IHYS+ICS), generating a combined voltage signal in response to the combined current, and comparing the combined voltage signal to the threshold voltage; and setting the pulse width modulation signal to a first voltage level in response to the combined voltage signal falling below the threshold voltage and resetting the pulse width modulation signal to a second voltage level in response to the current sense signal rising above the threshold voltage. - View Dependent Claims (24, 25, 26, 27, 28)
-
Specification