32 results about "Right half-plane" patented technology

A method to generate a substantially DC output having a voltage level different than a DC input, constituted of receiving a feedback signal representing at least one of the voltage level and the current level of the generated substantially DC output; relatively emphasizing the high frequency portion of the feedback signal; controlling the buck function of a cascaded buck-boost converter with a first switching signal having a first duty cycle, the first duty cycle being a first function of the received feedback signal responsive to said relatively emphasized high frequency portion; and controlling the boost function with a second switching signal having a second duty cycle, the second duty cycle being a second function of the received feedback signal, wherein the first switching signal and the second switching signal are continuously enabled to facilitate a continuous conduction mode.

In the vehicle surrounding viewing system 1A, the light shielding member 27, that is coated on the areas other than the effective area of the surface of the prism 4 provided in the case 3, can transmit only the ray of light 18L, that enters into the transmit window 2L of the case 3, then passes through the prism side surface 8L, and then internally reflects at the prism side surface 8R, and subsequently is focused by the focusing lens 9 to be guided to the left half plane 10L of the image pick-up plane of the image pick-up element 10, and also the ray of light 18R, that enters into the transmit window 2R of the case 3, then passes through the prism side surface 8R, and then internally reflects at the prism side surface 8L, and subsequently is focused by the focusing lens 9 to be guided to the right half plane 10R of the image pick-up plane of the image pick-up element 10.

A right-half plane (RHP) zero (RHZ) compensation scheme to improve the stability of the operational amplifier. A resistance RZ is implemented by a transistor. This transistor tracks process variations of the transistor drive by the op-amp to achieve better stability without requiring a bandwidth reduction. As a current source is not available to bias this transistor, a local bias circuit is used to provide this.

The invention provides a two-phase staggered magnetic integration boost converter. Inductances La and Lb, and inductances Lc and Ld form two phase respectively; the drive signals of switch tubes S1 and S2 mutually stagger with each other by 180 DEG; the inductances La, Lb, Lc and Ld share the same magnetic core; and La is coupled with Lb and Lc in the opposite direction, and is coupled with Ld in the forward direction. The invention also provides a condition for removing a right half plane zero point through a converter. When the parameter design is reasonable, the converter can satisfy the minimum phase system within the wide duty ratio working range, and can greatly improve the dynamic response speed of the converter. Except for the above advantages, the output filtering inductances are integrated in the same magnetic core and the power density of the converter can be greatly improved.

The invention discloses an adaptive hysteresis sliding-mode control method for a double-tube Buck-Boost converter. Aiming at the characteristic that the double-tube Buck-Boost converter has a right-half-plane zero point, a hysteresis current controller is adopted and the controlled quantity switching frequency is not over-high due to addition of hysteresis; aiming at the characteristic that the converter is relatively wide in input range, an adaptive feedforward is introduced, the hysteresis width is changed according to a change of input voltage and the switching frequency changes within a relatively small range when the input voltage changes; and aiming at the characteristic that the steady state switching frequency is affected by a load change, an adaptive feedback is introduced, a sliding coefficient is adjusted according to the load change and the switching frequency remains unchanged in the load change. Design and implementation of the controller are relatively simple; the response speed is relatively high; and the controller has relatively high stability and robustness, and can be applied to the occasions of a wide-range change of input voltage and a relatively large load change.

The present invention provides a transconductance amplifier comprising an input circuit, a gain circuit and an output circuit which are successively connected. The gain circuit comprises a MOS transistor array composed of a plurality of MOS transistors, grids of the corresponding MOS transistors between every two adjacent columns of the MOS transistor array are connected, the MOS transistors in each column of the MOS transistors are successively connected, and compensation capacitors are arranged between asymmetrical connection points of the MOS transistors in the output column of the MOS transistor array and an output terminal of the output circuit. According to the transconductance amplifier, compared with a traditional frequency compensation technology, dominant pole frequency of the transconductance amplifier can be reduced through increasing capacitance values of the compensation capacitors, right half plane zero frequency of the transconductance amplifier can also be prevented from being reduced, so that a distance between the dominant pole frequency and the right half plane zero frequency of the transconductance amplifier can be increased, the influence of frequency compensation on frequency characteristics of the transconductance amplifier can be reduced, unity-gain bandwidth of the transconductance amplifier can be improved, and the problem that the transconductance amplifier is possibly unstable can be solved.

The embodiment of the invention, which relates to the automatic control field of the process industry, provides a decoupling internal die controller, control system, and control method of a multivariable time-lag non-minimum-phase non-square system. The decoupling internal die controller comprises a dynamic decoupling compensation module, a generalized dynamic inversion module, a low-pass filter module, and an all-pass compensation module. To be specific, the dynamic decoupling compensation module is used for eliminating coupling based on the integrated design of an object model correlation matrix to realize dynamic decoupling; the generalized dynamic inversion module is used for calculating an input value according to a given value of a generalized controlled object, so that an output value of a controlled variable reaches the given value; the low-pass filter module is used for enhancing robustness of the system; and the all-pass compensation module is used for eliminating an adverse effect of a non-minimum phase part, being a zero pint of a right half plane (RHP) of the generalized controlled object, wherein the generalized dynamic inversion module can be realized based on the all-pass compensation design. According to the invention, the control equipment, system, and method are simple and feasible; the non-implemented factor of dynamic decoupling can be eliminated; the difficulty of inversion of the dynamic decoupling design controller process of the controlled object can be substantially reduced; the complete and dynamic decoupling can be realized; and the control precision and robustness of the system can be improved.

The invention discloses a main circuit structure eliminating right half plane zeros of a boost DC-DC (Direct Current - Direct Current) converter and a method for determining parameters thereof. The main circuit structure eliminating the right half plane zeros of the boost DC-DC converter comprises a main circuit structure of the boost DC-DC converter comprising a diode capacitor network; and two ends of a middle voltage stabilizing capacitor on the main circuit structure of the boost DC-DC converter are connected in parallel with an RC (Resistor Capacitor) damping circuit respectively. By the adoption of the main circuit structure eliminating the right half plane zeros of the boost DC-DC converter and the method for determining the parameters thereof, the zeros of a right half plane in a boost DC-DC converter system comprising the diode capacitor network are eliminated via a mode that the two ends of the middle voltage stabilizing capacitor are connected in parallel with the RC damping circuit respectively; therefore, a system controlled to the minimum phase of output voltage is obtained; the controller design of the boost DC-DC converter based on the diode capacitor network is effectively simplified; the steady and dynamic performances of the output voltage of the system are improved; and meanwhile, the dynamic response of the output voltage is sped up, and unstable potential hazards which may exist in the system are eliminated.