# US 2014/0153309 A1 · Frequency converter and switching method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153309 A1 - Document ID: US20140153309A1 - Status: Published application - Kind: A1 - Application number: 14/054,682 - Filed: 2013-10-15 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Industrial Technology Research Institute - Applicants: Industrial Technology Research Institute - Inventors: Keng-Yuan CHEN; Jwu-Sheng HU - Web page: https://patentgrep.com/patent/US20140153309A1 ## CPC - H02M 5/04: by static converters (controlling transformers, reactors or choke coils, e.g. by tap changing H02P13/00) - H03K 7/08: Duration or width modulation {; Duty cycle modulation} - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) ## Abstract A frequency converter includes a comparator, an error computation unit and a calibration unit. The comparator receives a reference voltage signal and a triangle wave signal, and outputs a switching signal. The switching signal is fed back to the error computation unit to calculate an error signal by computing the reference signal and the switching signal. The calibration unit calibrates the triangle wave signal or the reference voltage signal according to the error signal. ## Claims ### Claim 1 A switching method for a frequency converter, comprising: receiving a reference voltage signal by a comparator; receiving a triangle wave signal by the comparator; outputting a switching signal by the comparator; feeding back the switching signal to calculate an error signal by computing the reference voltage signal and the switching signal; and calibrating the triangle wave signal or the reference voltage signal according to the error signal. ### Claim 2 (depends on 1) The switching method according to claim 1, wherein the step of calculating the error signal is performed according to a computation frequency which is greater than a switching frequency of the triangle wave signal. ### Claim 3 (depends on 2) The switching method according to claim 2, wherein the computation frequency is an integral multiple of the switching frequency. ### Claim 4 (depends on 2) The switching method according to claim 2, wherein the switching frequency is a constant frequency. ### Claim 5 (depends on 2) The switching method according to claim 2, wherein the computation frequency is a constant frequency. ### Claim 6 (depends on 1) The switching method according to claim 1, wherein the step of outputting the switching signal, the step of feeding back the switching signal and calculating the error signal, and the step of calibrating the triangle wave signal or the reference voltage signal are repeated for a plurality number of times. ### Claim 7 (depends on 1) The switching method according to claim 1, wherein the calibrated triangle wave signal is a non-periodical changing form. ### Claim 8 (depends on 1) The switching method according to claim 1, wherein the switching signal is a non-symmetrical form. ### Claim 9 (depends on 1) The switching method according to claim 1, wherein the switching signal is a non-periodical changing form. ### Claim 10 A frequency converter, comprising: a comparator, for receiving a reference voltage signal and a triangle wave signal, and outputting a switching signal; an error computation unit, for calculating an error signal by computing the reference voltage signal and the switching signal after the switching signal is fed back to the error computation unit; and a calibration unit, for calibrating the triangle wave signal or the reference voltage signal according to the error signal. ### Claim 11 (depends on 10) The frequency converter according to claim 10, wherein the error computation unit computes according to a computation frequency greater than a switching frequency of the triangle wave. ### Claim 12 (depends on 11) The frequency converter according to claim 11, wherein the computation frequency is an integral multiple of the switching frequency. ### Claim 13 (depends on 11) The frequency converter according to claim 11, wherein the switching frequency is a constant frequency. ### Claim 14 (depends on 11) The frequency converter according to claim 11, wherein the computation frequency is a constant frequency. ### Claim 15 (depends on 10) The frequency converter according to claim 10, wherein the comparator, the error computation unit and the calibration unit repeat corresponding processes for a plurality number of times. ### Claim 16 (depends on 10) The frequency converter according to claim 10, wherein the calibrated triangle wave signal is a non-periodical changing form. ### Claim 17 (depends on 10) The frequency converter according to claim 10, wherein the switching signal is a non-symmetrical form. ### Claim 18 (depends on 10) The frequency converter according to claim 10, wherein the switching signal is a non-periodical changing form.