# US 2019/0173375 A1 · Electronic amplifier for amplifying an input signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173375 A1 - Document ID: US20190173375A1 - Status: Published application - Kind: A1 - Application number: 16/266,723 - Filed: 2019-02-04 - Published: 2019-06-06 - Earliest claimed: 2016-08-03 - Assignees: Technische Universitaet Muenchen - Applicants: Technische Universitaet Muenchen - Inventors: BERNHARD LEHMEYER; AMINE MEZGHANI; JOSEF NOSSEK - Web page: https://patentgrep.com/patent/US20190173375A1 ## CPC - H02M 1/34: Snubber circuits - H02M 1/088: for the simultaneous control of series or parallel connected semiconductor devices - H02M 7/537: using semiconductor devices only, e.g. single switched pulse inverters - H03F 3/2171: {with field-effect devices (H03F3/2173 - H03F3/2178 take precedence)} - H03F 3/2173: {of the bridge type} - 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) - H03F: AMPLIFIERS ## Abstract An electronic amplifier for amplifying an input signal has a branching node, a supply branch, a balance branch, an auxiliary branch and a load branch. All of the branches are connected in parallel to each other relative to the branching node and a reference potential. The supply branch supplies a DC voltage to the branching node. The balance branch absorbs and/or storing electric energy. A current supply device supplies a DC current. The control switch, the current valve and the current source are in different branches. The control switch, in a pass current state, establishes a current flow from the supply branch into either the auxiliary branch or the balance branch. In the block current state, current flows from the current supply device to the balancing device. The supply, balance and auxiliary branches provide an amplified signal to the load, controlled only by the input signal at the control switch. ## Claims ### Claim 1 An electronic amplifier for amplifying an input signal, the amplifier comprising: a branching node; a plurality of branches connected in parallel to one another relative to said branching node and a reference potential, said plurality of branches including a supply branch, a balance branch, an auxiliary branch and a load branch; said supply branch including at least one DC voltage supply configured to supply a DC voltage to said branching node; said balance branch including a balancing device configured to absorb and/or store electric energy; a current supply device configured to supply a DC current; a control switch to be switched between a pass current state and a block current state in dependence of the input signal; a voltage-dependent current valve configured to conduct a substantial DC current in one direction; each of said control switch, said current valve and said current source being disposed in a different one of said supply branch, said balance branch and said auxiliary branch; said control switch being configured, in the pass current state, to establish a current flow from said supply branch through said current supply device into either said auxiliary branch or said balance branch; and said control switch being configured, in the block current state, to establish a current flow from said current supply device to said balancing device by way of said current valve; and said supply branch, said balance branch and said auxiliary branch being configured to provide an amplified signal to said load branch, the amplified signal being controlled only by the input signal at said control switch. ### Claim 2 (depends on 1) The amplifier according to claim 1, wherein: said current supply device is disposed in said supply branch; said current valve is disposed in said balance branch; and said control switch is disposed in said auxiliary branch; said control switch in the pass current state is configured to establish a current flow from said supply branch through said current supply device into said auxiliary branch; and said control switch in the block current state is configured to establish a DC current flow from said current supply device through said current valve to said balancing device. ### Claim 3 (depends on 2) The amplifier according to claim 2, wherein: said current valve is connected in series between said branching node and said balancing device; and/or said control switch is connected in series between said branching node and the reference potential. ### Claim 4 (depends on 1) The amplifier according to claim 1, wherein: said current supply device is disposed in said balance branch; said current valve is disposed in said auxiliary branch; and said control switch is disposed in said supply branch; said control switch in the pass current state is configured to establish a current flow from said supply branch through said current supply device into said balance branch; and said control switch in the block current state is configured to establish a DC current flow from said current valve through said current supply device to said balancing device. ### Claim 5 (depends on 4) The amplifier according to claim 4, wherein: said current valve is connected in series between the reference potential and said branching node; and/or said control switch is connected in series between the DC voltage supply and said branching node. ### Claim 6 (depends on 1) The amplifier according to claim 1, wherein said load branch further comprises a band pass filter connected in series with a connection port, said band pass filter being configured to filter a filter frequency band at a center frequency matching a working frequency of a load. ### Claim 7 (depends on 6) The amplifier according to claim 6, further configured to amplify an input signal at a frequency corresponding to the center frequency of said band pass filter. ### Claim 8 (depends on 1) The amplifier according to claim 1, wherein said current supply device is at least one inductor. ### Claim 9 (depends on 1) The amplifier according to claim 1, wherein said balancing device comprises an energy recovery unit configured to store energy from a DC current led into said balance branch. ### Claim 10 (depends on 9) The amplifier according to claim 9, wherein said energy recovery unit comprises a rechargeable DC voltage supply or is connected with a rechargeable DC voltage supply. ### Claim 11 (depends on 10) The amplifier according to claim 10, wherein said rechargeable DC voltage supply is configured to supply a DC voltage to said branching node via said supply branch. ### Claim 12 (depends on 1) The amplifier according to claim 1, wherein said balancing device comprises an energy sink configured to absorb energy from a DC current conducted into said balance branch. ### Claim 13 (depends on 12) The amplifier according to claim 12, wherein said energy sink comprises at least one resistor and one capacitor in parallel connection. ### Claim 14 (depends on 1) The amplifier according to claim 1, wherein said current valve is one of a MOSFET and a Schottky diode, said Schottky diode being clamped in forward direction towards said balancing device. ### Claim 15 (depends on 1) The amplifier according to claim 1, configured to amplify a substantially square-shaped input signal. ### Claim 16 (depends on 1) The amplifier according to claim 1, wherein said control switch is a transistor having a base and a gate, and the input signal is provided to either said base or said gate of said transistor.