Patent Description:
In power electronics, including in welding-type power supplies, a switched mode power supply may be configured in various topologies based on the wiring of the switches. Some power electronics may also be configured to receive a range of input voltages, which can be divided up into multiple ranges. Disclosed example methods, systems, and apparatus verify that the configured switched mode power supply topology corresponds to the input voltage range, which may prevent operating inefficiency or damage to the power electronics.

Prior patent document <CIT> describes an example of a welding-type power supply comprising a controller, a pre-regulator, a pre-regulator bus and an output converter. The controller has a pre-regulator control output and an output converter control output. The pre-regulator is disposed to receive a range of inputs voltages and to receive the pre-regulator control output, and to provide a pre-regulator output signal. The pre-regulator includes a plurality of stacked boost circuits. The pre-regulator bus is disposed to receive the pre-regulator output signal. The output converter is disposed to receive the pre-regulator bus and to receive the output converter control output, and to provide a welding type power output. The output converter includes at least one stacked inverter circuit.

Methods, systems, and apparatus for determining and verifying a topology of a switched mode power supply are disclosed, substantially as illustrated by and described in connection with at least one of the figures.

Power electronics may include switched mode power supplies which convert input power to usable power for a high-power application. For example, in welding applications, a welding-type power supply may include a switched mode power supply which converts input power to welding-type power for a welding-type load. In some power electronic devices such as a welding-type power supply, the topology of the switched mode power supply may be configurable into two or more topologies. For a given power electronic device, certain switched mode power supply topologies are operable at certain input voltage ranges. For example, for the same power electronic device, a stacked full bridge may be operable at higher voltages as compared to a full H-bridge topology. If the topology of the switched mode power supply does not correspond to the input voltage, the power electronics may not operate efficiently or, in some examples, the power electronics may be damaged by excess voltage or current. Therefore, disclosed power electronic devices including configurable switched mode power supplies, include circuitry configured to determine the actual configured topology of the switched mode power supply, determine the input power voltage, and determine whether the switched mode power supply topology corresponds to the determined input power voltage. Disclosed power electronic devices may also indicate (e.g., to an operator) when the switched mode power supply topology does not correspond to the input voltage.

The invention is as defined in appended claim <NUM>.

In some embodiments, the input voltage corresponds to a stacked full bridge topology if the magnitude exceeds the threshold.

In some embodiments, the detection circuitry is configured to output an alert if the input voltage does not correspond to the configured switched mode power supply topology.

Some embodiments further include a user interface, and the user interface is configured to provide an indication that the input voltage does not correspond to the configured switched mode power supply topology.

In some embodiments, the detection circuitry includes a sensor configured to determine an installed position of at least one connector of the switched mode power supply.

Some embodiments further include a user operable switch configured to select the topology of the switched mode power supply based on the position of the switch, and the detection circuitry is configured to determine the configured topology based on a detection of the position of the switch.

Some embodiments further include a linking board, and an installed position of the linking board controls the topology of the switched mode power supply, and wherein the detection circuitry is configured to determine the configured topology based on a detection of the installed position of the linking board.

Some embodiments include: an input configured to receive input power; a sensor configured to measure a magnitude of the voltage of the input power; a switched mode power supply.

As used herein, the term "welding-type power" refers to power suitable for welding, plasma cutting, induction heating, CAC-A and/or hot wire welding/preheating (including laser welding and laser cladding). As used herein, the term "welding-type power supply" refers to any device capable of, when power is applied thereto, supplying welding, plasma cutting, induction heating, CAC-A and/or hot wire welding/preheating (including laser welding and laser cladding) power, including but not limited to inverters, converters, resonant power supplies, quasi-resonant power supplies, and the like, as well as control circuitry and other ancillary circuitry associated therewith.

As used herein, a welding-type power supply refers to any device capable of, when power is applied thereto, supplying welding, cladding, plasma cutting, induction heating, laser (including laser welding, laser hybrid, and laser cladding), carbon arc cutting or gouging and/or resistive preheating, including but not limited to transformer-rectifiers, inverters, converters, resonant power supplies, quasi-resonant power supplies, switch-mode power supplies, etc., as well as control circuitry and other ancillary circuitry associated therewith.

As used herein, the terms "circuit" and "circuitry" refer to physical electronic components (i.e. hardware) and any software and/or firmware ("code") which may configure the hardware, be executed by the hardware, and or otherwise be associated with the hardware.

The terms "control circuit" and "control circuitry," as used herein, may include digital and/or analog circuitry, discrete and/or integrated circuitry, microprocessors, digital signal processors (DSPs), and/or other logic circuitry, and/or associated software, hardware, and/or firmware. Control circuits may include memory and a processor to execute instructions stored in memory. Control circuits or control circuitry may be located on one or more circuit boards, that form part or all of a controller, and are used to control a welding process, a device such as a power source or wire feeder, motion, automation, monitoring, air filtration, displays, and/or any other type of welding-related system.

As used, herein, the term "memory" and/or "memory device" means computer hardware or circuitry to store information for use by a processor and/or other digital device. The memory and/or memory device can be any suitable type of computer memory or any other type of electronic storage medium, such as, for example, read-only memory (ROM), random access memory (RAM), cache memory, compact disc read-only memory (CDROM), electro-optical memory, magneto-optical memory, programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically-erasable programmable read-only memory (EEPROM), flash memory, solid state storage, a computer-readable medium, or the like.

As utilized herein, circuitry is "operable" to perform a function whenever the circuitry comprises the necessary hardware and code (if any is necessary) to perform the function, regardless of whether performance of the function is disabled or not enabled (e.g., by a userconfigurable setting, factory trim, etc.).

<FIG> illustrates an exemplary welding type system <NUM> including a welding-type power supply <NUM>. A source of power is provided to the welding-type power supply <NUM> via an AC power cord <NUM>. Typical ranges of AC power may be <NUM>/230VAC or <NUM>-<NUM> VAC, and may include single-phase or three-phase power. The example of <FIG> shows a 110VAC outlet, but the welding-type power supply <NUM> and/or the power cord <NUM> may be adapted or replaced to support one or more other sources of electrical power, such as other input voltages, hard wiring of the power supply <NUM> to the electrical source, engine-driven generator sources, and/or other sources of electrical power.

The example welding-type power supply <NUM> generally supplies power for the welding-type system <NUM>. Weld output <NUM> provides welding output power via one or more weld cables <NUM> coupled to a welding torch <NUM> and a workpiece <NUM> using a clamp <NUM>. Welding output power may be in the range of <NUM> Amps to <NUM> amps or more, and range from <NUM> volts at short circuit to <NUM> volts or more into an open welding arc. Modern welding power sources and systems can provide welding type power for various weld processes which may include advanced waveform generation and control that is responsive to dynamic or static conditions at the welding arc.

The illustrated welding type system includes a wire feeder <NUM> and a gas supply <NUM>. The welding-type power supply <NUM> may provide power and control to other equipment such as a wire feeder <NUM>. In the illustrated example, the welding torch <NUM> is coupled to the wire feeder <NUM> via coupler <NUM> in order to supply welding wire, shielding gas from the gas supply <NUM>, and/or welding-type power to the welding torch <NUM> during operation of the welding-type system <NUM>. In some examples, the welding-type power supply <NUM> may couple and/or directly supply welding-type power to the welding torch <NUM>. The wire feeder <NUM> may require a certain type of power, for example, 24V or 50V for proper operation of the wire feeder <NUM> control circuits. The power for the wire feeder <NUM> may be provided by the welding-type power supply <NUM> by a wire feeder <NUM> power supply circuit, or another type power circuit. In addition to power for the wire feeder <NUM>, one or more control signals may also be provided to allow proper operation of the wire feeder <NUM> and welding-type power supply <NUM>. These control signals may be analog or digital and may provide control and communication in a bi-directional manner. The power and control signals may be provided to the wire feeder <NUM> from the welding power source via cable(s) <NUM>.

The illustrated welding-type power supply <NUM> has a control panel <NUM> with various types of control features <NUM>, such as digital displays, control dials or potentiometers, control switches, LED indicators, etc. These control features <NUM> provide for normal operation and control of the welding system. In addition, these control features are used to signal or indicate an internal fault or abnormal condition that has been detected with the welding-type power supply <NUM>. For example, an LED indicator may be lit for a thermal overload condition, if the output capability or rating of the welding-type power supply <NUM> has been exceeded, or if the input power is unsupported.

<FIG> is a block diagram of a welding-type power supply that may implement the welding-type power supply <NUM> of <FIG>. The welding-type power supply <NUM> includes a switched mode power supply <NUM> which includes a plurality of controllable switches. The example welding-type power supply <NUM> receives AC input power <NUM>, which is rectified at the rectifier circuit <NUM>. A pre-regulator circuit <NUM> provides a regulated bus voltage (e.g., Vbus), which may be regulated to a voltage greater than the peak of the rectified line voltage <NUM>.

The switched mode power supply <NUM> receives the bus voltage Vbus and outputs welding-type power <NUM>. The switched mode power supply <NUM> includes a plurality of switches, capacitor(s), and a high-frequency transformer. The components of the switched mode power supply <NUM> (e.g., the plurality of switches, the capacitors, and a high-frequency transformer) are connectable such that the switched mode power supply <NUM> has various configurable topologies. The components of the switched mode power supply <NUM> may be connected such that the switched mode power supply <NUM> is configured in a Full H-bridge topology or is configured in a stacked full-bridge topology. Certain topologies may be desirable for certain power inputs (e.g., the magnitude of the voltage of the power supplied to the input <NUM>), certain welding type outputs, and/or certain welding-type applications.

The topology of the switched mode power supply <NUM> may be configured in various ways. In some examples, the switched mode power supply <NUM> may be manually configured via connecting jumper wires to nodes of the switched mode power supply <NUM>. In some examples, a switch may be toggled (e.g., a switch on the outside of the power supply <NUM>) which controls configuration circuitry <NUM> which automatically makes the connections to configure the switched mode power supply <NUM> into the selected configuration. In some examples, an operator may select a switched mode power supply <NUM> topology via the control panel <NUM>, and the configuration circuitry <NUM> automatically configures the switched mode power supply <NUM> based on the selection. In some examples, the power supply <NUM> may include a slot to receive a linking device having pins (e.g., a link board). Inserting the linking board completes connections of the switched mode power supply <NUM>, such that various linking boards may configure the switched mode power supply <NUM> in various topologies. In some examples, a linking board may have a header with shorted pins. The linking board may be moved from one location to another to configure the switched mode power supply <NUM> into various topologies.

<FIG> and <FIG> are schematic circuit diagrams of the power conversion circuitry (i.e., the input <NUM>, the rectifier circuit <NUM>, and the switched mode power supply <NUM>) of the welding-type power supply <NUM>. In <FIG>, the switched mode power supply <NUM> is configured in a stacked full bridge topology. In <FIG>, the switched mode power supply <NUM> is configured in a full H-bridge topology. As described with reference to <FIG>, the welding-type power supply receives input power <NUM> and rectifies the input power at the rectifier circuit <NUM>. The rectifier circuit <NUM> includes diodes <NUM> and an input inductor <NUM>. The switched mode power supply <NUM> converts the rectified power to welding-type power. A pre-regulator circuit <NUM> provides a regulated DC bus voltage to the switched mode power supply <NUM>.

The switched mode power supply <NUM> of <FIG> and <FIG> includes four switching elements, <NUM>, <NUM>, <NUM>, and <NUM>. The control terminals of the switching elements <NUM>, <NUM>, <NUM>, and <NUM> (e.g., the gates when using transistors for the switching elements) are controlled by control circuitry <NUM> of the welding-type power supply <NUM>. In some examples, the example switching elements <NUM>, <NUM>, <NUM>, and <NUM> may be insulated-gate bipolar transistors (IGBTs).

The control circuitry <NUM> controls the switching elements <NUM>, <NUM>, <NUM>, and <NUM> such that a controlled voltage is provided to a primary side of a high-frequency transformer <NUM>, and the secondary side of the transformer <NUM> correspondingly outputs welding-type power. The switched mode power supply <NUM> of <FIG> and <FIG> also include a capacitor <NUM> in series with the high-frequency transformer <NUM>. The capacitor <NUM> allows for bidirectional current flow in the transformer <NUM>. The switched mode power supply <NUM> also includes bus capacitors <NUM> and <NUM>, which provide the bus voltage.

As shown in <FIG> and <FIG>, the topology of the switched mode power supply <NUM> is based on the connections of the switched mode power supply <NUM> components (e.g. the switching elements <NUM>, <NUM>, <NUM>, and <NUM>, and the bus capacitors <NUM> and <NUM>). The connections between the switched mode power supply components may be configured in several ways. For example, the switched mode power supply <NUM> may be manually configured via jumper wires. In some examples, a switch may be toggled (e.g., a switch on the outside of the power supply <NUM>) which controls configuration circuitry <NUM> which automatically makes the connections to configure the switched mode power supply <NUM> into the selected configuration. In some examples, an operator may select a switched mode power supply <NUM> topology via the control panel <NUM>, and the configuration circuitry <NUM> automatically configures the switched mode power supply <NUM> based on the selection. In some examples, the power supply <NUM> may include a slot to receive a linking device having pins (e.g., a link board). Inserting the linking board completes connections of the switched mode power supply <NUM>, such that various linking boards may configure the switched mode power supply <NUM> in various topologies. In some examples, a linking board may have a header with shorted pins. The linking board may be moved from one location to another to configure the switched mode power supply <NUM> into various topologies.

Depending on the topology of the switched mode power supply <NUM>, various nodes of the switched mode power supply <NUM> will be directly connected (e.g., shorted). For example, as shown in <FIG>, in the stacked full bridge topology, node C <NUM> is shorted with node B <NUM>. And as shown in <FIG>, in the full H-bridge topology, node A <NUM> is shorted with node B <NUM>, and node C <NUM> is shorted with node D <NUM>. Therefore, voltage and/or resistance measurements between the nodes (node A <NUM>, node B <NUM>, node C <NUM>, and node D <NUM>) may be used to determine the actual topology of the switched mode power supply <NUM>.

Returning to <FIG>, the welding-type power supply <NUM> includes topology detection circuitry <NUM> configured to determine a topology of the switched mode power supply <NUM>. For example, the topology detection circuitry <NUM> may be a voltage sensor or a resistance sensor that determines the voltage and/or resistance between two or more nodes of the switched mode power supply <NUM>. In some examples the two possible topologies are a stacked full bridge topology (as shown in <FIG>) and a full H-bridge topology (as shown in <FIG>). The topology detection circuitry <NUM> may measure a voltage and/or resistance between at least two nodes (<NUM>, <NUM>, <NUM>, and/or <NUM>) of the switched mode power supply <NUM>.

Specifically, to determine where the switched mode power supply <NUM> is configured in a stacked full bridge topology or a full H-bridge topology, the topology detection circuitry <NUM> may measure the voltage or resistance between: <NUM>) node A <NUM> and node B <NUM>; <NUM>) node B <NUM> and node C <NUM>; or <NUM>) node C <NUM> and node D <NUM>. According to the invention, the detection circuitry <NUM> is configured to determine if a configured topology of the switched mode power supply <NUM> is the first topology or the second topology based on a voltage difference between at least two of the nodes measured by a voltage sensor.

If the topology detection circuitry <NUM> determines that node A <NUM> is shorted with node B <NUM>, then the detection circuitry <NUM> determines that the switched mode power supply <NUM> is configured in a full H-bridge topology. If the topology detection circuitry <NUM> determines that node A <NUM> is not shorted with node B <NUM>, then the topology detection circuitry <NUM> determines that the switched mode power supply <NUM> is configured in a stacked full bridge topology.

If the topology detection circuitry <NUM> determines that node B <NUM> is shorted with node C <NUM>, then the topology detection circuitry <NUM> determines that the switched mode power supply <NUM> is configured in a stacked full bridge topology. If the topology detection circuitry <NUM> determines that node B <NUM> is not shorted with node C <NUM>, then the topology detection circuitry <NUM> determines that the switched mode power supply <NUM> is configured in a full H-bridge topology.

If the topology detection circuitry <NUM> determines that node C <NUM> is shorted with node D <NUM>, then the topology detection circuitry <NUM> determines that the switched mode power supply <NUM> is configured in a full H-bridge topology. If the topology detection circuitry <NUM> determines that node C <NUM> is not shorted with node D <NUM>, then the topology detection circuitry <NUM> determines that the switched mode power supply <NUM> is configured in a stacked full bridge topology.

In some examples, rather than a voltage or resistance sensor, the topology detection circuitry <NUM> may be a sensor that determines an installed position of a linking device (e.g., a link board. ), such examples are outside the scope of the invention. The position of a linking device having pins that connects the components of the switched mode power supply <NUM> may determine the topology of the switched mode power supply <NUM>. A sensor may determine the position of the linking device, and correspondingly the topology of the switched mode power supply <NUM>. The sensor (the detection circuitry <NUM>) may be a opto interrupter, a proximity sensor, a hall device, a switch, or the like.

In some examples, an operator may toggle a physical switch on the power supply <NUM> to select a certain switched mode power supply <NUM> topology. The topology detection circuitry <NUM> may determine the physical position of the switch in order to determine the topology of the switched mode power supply <NUM>. In some examples, the operator may select a switched mode power supply <NUM> topology via the control panel <NUM>, and the power supply <NUM> may automatically configure the switched mode power supply <NUM> based on the selected topology. The control panel <NUM> may send a signal to the control circuitry <NUM> indicating the selected topology.

The welding-type power supply <NUM> also includes input power detection circuitry <NUM>. The input power detection circuitry <NUM> measures the voltage of the input power <NUM>.

The control circuitry <NUM> determines if the measured input voltage corresponds to the switched mode power supply <NUM> topology determined by the topology detection circuitry <NUM>. For example, a stacked full bridge topology may correspond to a high input voltage range, and a full H-bridge topology may correspond to a lower input voltage range. In some examples, a stacked full bridge topology may not operate efficiently at low input voltages. In some examples, operating a switched mode power supply having a full H-bridge topology may at high input voltages may result in damage to the power electronics of the power supply.

In other words, the switched mode power supply <NUM> is configurable in two topologies, a stacked full bridge topology and a full H-bridge topology, as shown in <FIG> and <FIG>. In such examples, there are four possible voltage input level and topology combinations. Two combinations are operable: <NUM>) high input voltage and stacked full bridge (where high input voltage refers to an input voltage above a predetermined threshold, e.g., <NUM> VAC); and <NUM>) low input voltage and full H-bridge (where low input voltage refers to a voltage at or below a threshold, e.g., <NUM> VAC). Two of the four possible combinations are not desirable and may result in a lack of efficiency or damage to the power electronics: <NUM>) high input voltage and full H-bridge; and <NUM>) low input voltage and stacked full bridge. Therefore, the power supply <NUM> includes circuitry (e.g., the control circuity <NUM>, topology detection circuitry <NUM>, and/or input detection) configured to verify that the switched mode power supply <NUM> topology corresponds to the input voltage range.

For example, the stacked full bridge topology may correspond to an input voltage of <NUM> VAC to <NUM> VAC, and a full H-bridge topology may correspond to an input voltage of less than <NUM> VAC. The control circuitry <NUM> may signal an alert if the switched mode power supply <NUM> topology determined by the topology detection circuitry <NUM> does not correspond to the input voltage determined by the input detection circuitry <NUM>. For example, the control circuitry <NUM> may indicate an error and the type of error to the control panel <NUM> of the welding-type power supply <NUM>. Accordingly, an operator can configure the switched mode power supply <NUM> such that the switched mode power supply <NUM> topology corresponds to the input voltage or adjust the input voltage to corresponds to the topology of the switched mode power supply <NUM>.

According to the invention, control circuitry <NUM> prevents the power conversion circuitry from outputting welding-type power or the welding-type power supply <NUM> from executing a start-up routine if the input voltage does not correspond to the configured switched mode power supply <NUM> topology. In some examples, the control circuitry <NUM> disables the switched mode power supply <NUM> (e.g., disable output from the switched mode power supply <NUM>) if the determined topology of the switched mode power supply <NUM> does not correspond to the determined input voltage. In some examples, the control circuitry <NUM> disables a start-up sequence of the welding-type power supply <NUM> if the determined topology of the switched mode power supply <NUM> does not correspond to the determined input voltage. In some examples, the control circuitry <NUM> may not allow an operator to select any weld parameters or weld processes (e.g., via the control panel <NUM>) until an operator reconfigures the switched mode power supply <NUM> topology or adjusts the input voltage (e.g., until the control circuitry <NUM> determines that the switched mode power supply <NUM> topology corresponds to the determined input voltage. ) In some examples, the control circuitry <NUM> continuously monitors the switched mode power supply <NUM> topology and the input voltage, and signals an error at any time when the switched mode power supply <NUM> topology does not correspond to the input voltage.

<FIG> is a flowchart illustrating example machine readable instructions <NUM> which may be executed by the example topology detection circuitry <NUM>, input detection circuitry <NUM>, the control circuitry <NUM> and/or, more generally, the welding-type power supply <NUM> of <FIG> to verify that the switched mode power supply topology <NUM> corresponds to the input voltage.

At block <NUM>, the topology detection circuitry <NUM> measures a voltage or a resistance between node A <NUM> and node B <NUM>. At block <NUM>, the input detection circuitry <NUM> measures the input voltage of the AC input power <NUM>. At block <NUM>, the control circuitry <NUM> determines whether the measured voltage or resistance between node A <NUM> and node B <NUM> indicates that node A <NUM> is shorted with node B <NUM>. According to the invention, the detection circuitry <NUM> is configured to determine if a configured topology of the switched mode power supply <NUM> is the first topology or the second topology based on a voltage difference between at least two of the nodes measured by a voltage sensor.

If node A <NUM> is shorted with node B <NUM> (block <NUM>), then at block <NUM> the control circuitry <NUM> determines that the switched mode power supply <NUM> is configured in a full H-bridge topology. At block <NUM>, the control circuitry <NUM> determines whether the input voltage measured at block <NUM> exceeds a threshold. The threshold may be, for example, <NUM> VAC. If the input voltage does not exceed the threshold (block <NUM>), then the control circuitry <NUM> proceeds to block <NUM>. If the input voltage exceeds the threshold (block <NUM>), then the control circuitry <NUM> proceeds to block <NUM>.

If node A <NUM> is not shorted with node B <NUM> (block <NUM>), then at block <NUM>, the control circuitry <NUM> determines that the switched mode power supply <NUM> is configured in a stacked full bridge topology. At block <NUM>, the control circuitry <NUM> determines whether the input voltage measured at block <NUM> exceeds the threshold (the same threshold as in block <NUM>). If the input voltage exceeds the threshold (block <NUM>), then the control circuitry <NUM> proceeds to block <NUM>. If the input voltage does not exceed the threshold (block <NUM>), then the control circuitry <NUM> proceeds to block <NUM>.

At block <NUM>, the control circuitry <NUM> determines that the topology of the switched mode power <NUM> supply corresponds to the input voltage. At block <NUM>, the control circuitry <NUM> may then allow a start-up routine of the welding-type power supply <NUM>, allow operation of the switched mode power supply <NUM>, allow an operator to input weld parameters into the control panel <NUM>, and/or otherwise allow normal operation of the power supply <NUM>. In some examples, the control circuitry <NUM> may then return to block <NUM> to continuously monitor that the switched mode power supply <NUM> topology corresponds to the input voltage.

At block <NUM>, the control circuitry <NUM> determines that the switched mode power supply <NUM> topology does not correspond to the input voltage and signals an error. At block <NUM>, the control circuitry <NUM> may then disable a start-up routine of the welding-type power supply, disable operation of the switched mode power supply <NUM>, prevent an operator from inputting weld parameters into the control panel <NUM>, indicate on the control panel <NUM> or via some visible or audible indicator that the switched mode power supply <NUM> topology does not correspond to the input voltage, or otherwise allow normal operation of the power supply <NUM>.

Although the instructions <NUM> include measuring the voltage or resistance between nodes A <NUM> and node B <NUM>, as explained above the control circuitry <NUM> and/or the topology detection circuitry <NUM> may measure the resistance and/or voltage between: node B <NUM> and node C <NUM>; or <NUM>) node C <NUM> and node D <NUM> in order to determine whether the switched mode power supply <NUM> is configured in a stacked full bridge topology or a full H-bridge topology. And as described above, in some examples outside the scope of the present invention, rather than measuring the resistance or voltage between nodes, the control circuitry <NUM> may receive an indication from another sensor (or the control panel <NUM> or a manipulable switch) which indicates the switched mode power supply <NUM> topology.

Claim 1:
A welding-type power supply (<NUM>) comprising:
power conversion circuitry configured to receive input power and convert the input power to welding-type power, the power conversion circuitry comprising:
a rectifier circuit (<NUM>) configured to rectify the input power;
a pre-regulator circuit (<NUM>) configured to receive the rectified input power and provide a regulated bus voltage; and
a switched mode power supply (<NUM>) configured to receive the regulated bus voltage and output welding-type power, wherein the switched mode power supply (<NUM>) comprises four controllable switches (<NUM>, <NUM>, <NUM>, <NUM>) configurable in a first topology and in a second topology, the first topology being a stacked full bridge topology and the second topology being a full H-bridge topology;
a voltage sensor configured to measure a voltage difference between at least two nodes of the switched mode power supply (<NUM>), wherein each of the nodes is adjacent to at least one of the plurality of controllable switches;
detection circuitry (<NUM>) configured to:
determine (<NUM>, <NUM>, <NUM>) if a configured topology of the switched mode power supply (<NUM>) is the first topology or the second topology based on the voltage difference measured by the voltage sensor, wherein the voltage difference indicates if the nodes are directly connected and shorted with each other; and
control circuitry configured to:
compare the magnitude of an input voltage to a threshold to determine whether the input voltage corresponds to the first topology or the second topology; and
prevent the power conversion circuitry from outputting welding-type power or the welding-type power supply (<NUM>) from executing a start-up routine if the input voltage does not correspond to the configured switched mode power supply (<NUM>) topology.