CN220798082U - Double-range single-channel power supply with Kelvin four-wire function - Google Patents
Double-range single-channel power supply with Kelvin four-wire function Download PDFInfo
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Abstract
The application discloses a dual-range single-channel power supply with Kelvin four-wire function, including ten nodes that are used for connecting, power source end series-parallel circuit, power output end connecting circuit, first acquisition circuit, second acquisition circuit and the same first power and the second power of parameter. The power source end serial-parallel circuit is used for connecting the first power source and the second power source in series or in parallel, and the power output end connecting circuit is used for establishing electric connection between the positive electrode and the negative electrode or the far-end voltage readback connection point of the first power source and the second power source and the first acquisition circuit and the second acquisition circuit through the first single-pole double-throw switch circuit, the second single-pole double-throw switch circuit and the third single-pole double-throw switch circuit so as to realize the Kelvin four-wire function of the double-range single-channel power source. Kelvin four-wire function of the double-range single-channel power supply can be realized through the series-parallel connection and switch connection circuit, and further, acquisition and calibration of double-power-supply voltage are realized, and the function is simple to realize and easy to operate.
Description
Technical Field
The application relates to the technical field of direct current power supplies, in particular to a double-range single-channel power supply with Kelvin four-wire function.
Background
The direct current power supply is mainly divided into a switching power supply and a linear power supply, wherein the switching power supply is small in size, high in efficiency and low in efficiency, and the linear power supply has good ripple. Kelvin four-wire method, which is commonly used for measuring small resistance with universal meter, can also be used for high-current DC power supply. The remote voltage is acquired through the additional double-line connection to the load equipment, and the voltage control loop ensures that the voltage received by the load equipment is equal to the power supply set value. The double-range output of high-voltage small current or low-voltage large current can widen the application range under certain power, specifically, two groups of identical transformer output coils are connected in series or in parallel, or two power modules with identical parameter settings are connected in series or in parallel, and the two power modules can equally divide voltage or current to a certain extent, equally divide pressure and improve efficiency. In the prior art, a dual direct current power supply with the same parameters is adopted, and a high-voltage small current or a low-voltage large current can be output in a serial or parallel mode, so that dual-range output is realized, but the dual-range output does not have a Kelvin four-wire function (sense function), and particularly, the voltage value received by load equipment cannot be well ensured to be equal to the set value of the power supply because of the existence of a resistor in a cable.
Disclosure of Invention
In a first aspect, an embodiment provides a dual-range single-channel power supply with a kelvin four-wire function, which includes a first node a, a second node B, a third node C, a fourth node D, a fifth node E, a sixth node F, a seventh node G, an eighth node H, a ninth node I, a tenth node J, a power source end serial-parallel circuit, a power output end connection circuit, a first acquisition circuit, a second acquisition circuit, and a first power supply and a second power supply with the same parameters;
the first node A, the sixth node F, the seventh node G, the eighth node H, the ninth node I and the tenth node J are connected with the power output end connecting circuit; the first node A and the sixth node F are used as a far-end voltage positive readback connection point and a far-end voltage negative readback connection point of the double-range single-channel power supply respectively;
the second node B and the third node C are respectively connected with the positive electrode and the negative electrode of the first power supply;
the fourth node D and the fifth node E are respectively connected with the positive electrode and the negative electrode of the second power supply;
the power source end serial-parallel circuit is used for connecting the first power source and the second power source in series or in parallel so as to realize dual-range output;
the power supply output end connecting circuit comprises a first single-pole double-throw switch circuit, a second single-pole double-throw switch circuit and a third single-pole double-throw switch circuit; the fixed end of the first single-pole double-throw switch circuit is connected with the seventh node G, the first movable end of the first single-pole double-throw switch circuit is connected with the first node A, and the second movable end of the first single-pole double-throw switch circuit is connected with the second node B; the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H and/or the ninth node I, the first movable end of the second single-pole double-throw switch circuit is connected with the third node C, the fourth node D and/or the ninth node I, and the second movable end of the second single-pole double-throw switch circuit is connected with the tenth node J; the fixed end of the third single-pole double-throw switch circuit is connected with the tenth node J, the first movable end of the third single-pole double-throw switch circuit is connected with the fifth node E, and the second movable end of the third single-pole double-throw switch circuit is connected with the sixth node F;
the first acquisition circuit is used for acquiring a voltage value between the seventh node G and the eighth node H;
the second acquisition circuit is used for acquiring a voltage value between the ninth node I and the tenth node J.
In one embodiment, the power source end serial-parallel circuit comprises a first switch circuit, a second switch circuit and a third switch circuit; the first switch circuit is connected between the third node C and the fourth node D; the second switch circuit is connected between the second node B and the fourth node D; the third switching circuit is connected between the third node C and the fifth node E.
In an embodiment, the first switch circuit, the second switch circuit and the third switch circuit respectively include a first switch K1, a second switch K2 and a third switch K3.
In an embodiment, the first single pole double throw switch circuit, the second single pole double throw switch circuit and the third single pole double throw switch circuit respectively comprise a first single pole double throw switch K4, a second single pole double throw switch K5 and a third single pole double throw switch K6.
In an embodiment, when the power source end serial-parallel circuit connects the first power source and the second power source in series, the first single-pole double-throw switch circuit is electrically connected to the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected to the fifth node E and the tenth node J, and the stationary end of the second single-pole double-throw switch circuit is connected to the first moving end of the second single-pole double-throw switch circuit.
In an embodiment, when the power source end serial-parallel circuit connects the first power source and the second power source in parallel, the first single-pole double-throw switch circuit is electrically connected to the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected to the fifth node E and the tenth node J, and the stationary end of the second single-pole double-throw switch circuit is connected to the second moving end of the second single-pole double-throw switch circuit.
In an embodiment, when the first single pole double throw switch circuit is electrically connected to the first node a and the seventh node G, and the third single pole double throw switch circuit is electrically connected to the sixth node F and the tenth node J, the double range single channel power supply turns on the kelvin four-wire function.
In an embodiment, the stationary end of the second single-pole double-throw switch circuit is connected to the eighth node H and the ninth node I, and the first movable end of the second single-pole double-throw switch circuit is connected to the third node C; or alternatively, the first and second heat exchangers may be,
the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H, and the first movable end of the second single-pole double-throw switch circuit is connected with the third node C and the ninth node I; or alternatively, the first and second heat exchangers may be,
the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H and the ninth node I, and the first movable end of the second single-pole double-throw switch circuit is connected with the fourth node D; or alternatively, the first and second heat exchangers may be,
the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H, and the first movable end of the second single-pole double-throw switch circuit is connected with the fourth node D and the ninth node I.
In an embodiment, the first acquisition circuit and the second acquisition circuit are an operational amplifier circuit and an analog-to-digital conversion circuit.
According to the double-range single-channel power supply of the embodiment, the Kelvin four-wire function of the double-range single-channel power supply can be realized through a simple power supply end serial-parallel circuit and a power supply output end connecting circuit, and further, the acquisition and calibration of double-power supply voltage are realized, the function is simple to realize, and the operation is easy.
Drawings
FIG. 1 is a block diagram of a dual range single channel power supply in one embodiment;
FIG. 2 is a schematic circuit diagram of a dual-range single-channel power supply in one embodiment;
FIG. 3 is a schematic diagram of a circuit connection when a dual-range single-channel power supply is serially output in one embodiment;
FIG. 4 is a schematic diagram of a circuit connection when a dual-range single-channel power supply is serially output in another embodiment;
FIG. 5 is a schematic diagram of a circuit connection of a dual-range single-channel power supply in another embodiment;
fig. 6 is a schematic circuit connection diagram of a dual-range single-channel power supply series output in another embodiment.
Detailed Description
The utility model will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
Embodiment one:
referring to fig. 1, a block diagram of a dual-range single-channel power supply in an embodiment is shown, where the dual-range single-channel power supply includes a first node a, a second node B, a third node C, a fourth node D, a fifth node E, a sixth node F, a seventh node G, an eighth node H, a ninth node I, a tenth node J, a power source serial-parallel circuit 30, a power output connection circuit 40, a first acquisition circuit 50, a second acquisition circuit 60, and a first power source 10 and a second power source 20 with the same parameters. The Kelvin four-wire function of the double-range single-channel power supply is a power supply which can provide high voltage and small current and can provide low voltage and large current. In one embodiment, the first acquisition circuit and the second acquisition circuit are both an operational amplifier circuit and an analog-to-digital conversion circuit.
Referring to fig. 2, a schematic circuit structure of a dual-range single-channel power supply in an embodiment is shown, where a first node a, a sixth node F, a seventh node G, an eighth node H, a ninth node I, and a tenth node J are connected to a power supply output end connection circuit 40, and the first node a and the sixth node F are used as a remote voltage positive readback connection point sense+ and a remote voltage negative readback connection point Sense-, respectively. The second node B and the third node C are connected to the positive and negative poles of the first power supply 10, respectively. The fourth node D and the fifth node E are connected to the positive and negative poles of the second power supply 20, respectively. The power source serial-parallel circuit is used for connecting the first power source 10 and the second power source 20 in series or in parallel so as to realize dual-range output. The power output connection circuit 40 includes a first single pole double throw switch circuit, a second single pole double throw switch circuit, and a third single pole double throw switch circuit. The fixed end of the first single-pole double-throw switch circuit is connected with a seventh node G, the first movable end of the first single-pole double-throw switch circuit is connected with a first node A, and the second movable end of the first single-pole double-throw switch circuit is connected with a second node B. The fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H and/or the ninth node I, the first movable end of the second single-pole double-throw switch circuit is connected with the third node C, the fourth node D and/or the ninth node I, and the second movable end of the second single-pole double-throw switch circuit is connected with the tenth node J. The fixed end of the third single-pole double-throw switch circuit is connected with a tenth node J, the first movable end of the third single-pole double-throw switch circuit is connected with a fifth node E, and the second movable end of the third single-pole double-throw switch circuit is connected with a sixth node F. The first acquisition circuit 50 is configured to acquire a voltage value between the seventh node G and the eighth node H. The second acquisition circuit 60 is configured to acquire a voltage value between the ninth node I and the tenth node J. The power source serial-parallel circuit 30 includes a first switch circuit, a second switch circuit, and a third switch circuit. The first switching circuit is connected between the third node C and the fourth node D. The second switching circuit is connected between the second node B and the fourth node D. The third switching circuit is connected between the third node C and the fifth node E. When the first switch circuit is closed and the second switch circuit and the third switch circuit are both opened, the series connection function of the first power supply and the second power supply is realized. When the first switch circuit is opened and the second switch circuit and the third switch circuit are closed, the parallel connection function of the first power supply and the second power supply is realized.
In one embodiment, the first switch circuit, the second switch circuit and the third switch circuit respectively include a first switch K1, a second switch K2 and a third switch K3. In one embodiment, the first single pole double throw switch circuit, the second single pole double throw switch circuit, and the third single pole double throw switch circuit include a first single pole double throw switch K4, a second single pole double throw switch K5, and a third single pole double throw switch K6, respectively.
In one embodiment, the first switch K1, the second switch K2, the third switch K3, the first single pole double throw switch K4, the second single pole double throw switch K5, and the third single pole double throw switch K6 are relay switches. In one embodiment, the relay type of the first switch K1, the second switch K2 and the third switch K3 is JQC-3FF/006-1ZS (551). In one embodiment, the relay type numbers of the first single-pole double-throw switch K4, the second single-pole double-throw switch K5 and the third single-pole double-throw switch K6 are UD2-4.5NU, and the relay of the type is two-way, and the same signal controls two paths of single-pole double throws. In one embodiment, the first single pole double throw switch K4 and the third single pole double throw switch K6 are controlled by the same signal, the on and off of the kelvin four wire function can share a relay with the model UD2-4.5NU, and the second single pole double throw switch K5 is a single relay, wherein two paths can be used in parallel.
Please refer to fig. 3, which is a schematic diagram of circuit connection when the dual-range single-channel power supply is serially output in an embodiment, when the power supply source serial-parallel circuit connects the first power supply v_ch1 and the second power supply v_ch2 in series (the first switch K1 is turned on, the second switch K2 and the third switch K3 are turned off), a high-voltage low-current power supply can be provided. The first single-pole double-throw switch circuit is electrically connected with the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected with the fifth node E and the tenth node J, the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H and the ninth node I, the first movable end of the second single-pole double-throw switch circuit is connected with the third node C, the second movable end of the second single-pole double-throw switch circuit is connected with the tenth node J, and the fixed end of the second single-pole double-throw switch circuit is connected with the first movable end. In an embodiment, when the power source end serial-parallel circuit connects the first power source v_ch1 and the second power source v_ch2 in parallel (the first switch K1 is turned off, the second switch K2 and the third switch K3 are turned on), a low-voltage high-current power source can be provided. The first single-pole double-throw switch circuit is connected with the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected with the fifth node E and the tenth node J, the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H and the ninth node I, the first movable end of the second single-pole double-throw switch circuit is connected with the third node C, the second movable end of the second single-pole double-throw switch circuit is connected with the tenth node J, and the fixed end of the second single-pole double-throw switch circuit is connected with the second movable end.
Referring to fig. 4, a schematic circuit connection diagram of a dual-range single-channel power supply in another embodiment is shown when the power supply source serial-parallel circuit connects the first power supply v_ch1 and the second power supply v_ch2 in series (the first switch K1 is turned on, the second switch K2 and the third switch K3 are turned off), the first single-pole double-throw switch circuit is electrically connected to the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected to the fifth node E and the tenth node J, the stationary end of the second single-pole double-throw switch circuit is connected to the eighth node H, the first moving end of the second single-pole double-throw switch circuit is connected to the third node C and the ninth node I, the second moving end of the second single-pole double-throw switch circuit is connected to the tenth node J, and the stationary end of the second single-pole double-throw switch circuit is connected to the first moving end. In one embodiment, when the power source end serial-parallel circuit connects the first power source v_ch1 and the second power source v_ch2 in parallel (the first switch K1 is turned off, and the second switch K2 and the third switch K3 are turned on). The first single-pole double-throw switch circuit is electrically connected with the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected with the fifth node E and the tenth node J, the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H, the first movable end of the second single-pole double-throw switch circuit is connected with the third node C and the ninth node I, the second movable end of the second single-pole double-throw switch circuit is connected with the tenth node J, and the fixed end of the second single-pole double-throw switch circuit is connected with the second movable end.
Referring to fig. 5, a schematic circuit connection diagram of a dual-range single-channel power supply in another embodiment is shown, when a power source serial-parallel circuit connects a first power source v_ch1 and a second power source v_ch2 in series (the first switch K1 is turned on, the second switch K2 and the third switch K3 are turned off), the first single-pole double-throw switch circuit is electrically connected to the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected to the fifth node E and the tenth node J, the inactive end of the second single-pole double-throw switch circuit is connected to the eighth node H and the ninth node I, the first active end of the second single-pole double-throw switch circuit is connected to the fourth node D, the second active end of the second single-pole double-throw switch circuit is connected to the tenth node J, and the inactive end of the second single-pole double-throw switch circuit is connected to the first active end. In an embodiment, when the power source end serial-parallel circuit connects the first power source v_ch1 and the second power source v_ch2 in parallel (the first switch K1 is turned off, the second switch K2 and the third switch K3 are turned on), the first single-pole double-throw switch circuit is electrically connected to the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected to the fifth node E and the tenth node J, the stationary end of the second single-pole double-throw switch circuit is connected to the eighth node H and the ninth node I, the first movable end of the second single-pole double-throw switch circuit is connected to the fourth node D, the second movable end of the second single-pole double-throw switch circuit is connected to the tenth node J, and the stationary end of the second single-pole double-throw switch circuit is connected to the second movable end.
Referring to fig. 6, a schematic circuit connection diagram of a dual-range single-channel power supply serial output in another embodiment is shown, when a power supply source serial-parallel circuit connects a first power supply v_ch1 and a second power supply v_ch2 in series (the first switch K1 is turned on, the second switch K2 and the third switch K3 are turned off), the first single-pole double-throw switch circuit is electrically connected to the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected to the fifth node E and the tenth node J, the stationary end of the second single-pole double-throw switch circuit is connected to the eighth node H, the first moving end of the second single-pole double-throw switch circuit is connected to the fourth node D and the ninth node I, and the second moving end of the second single-pole double-throw switch circuit is connected to the first moving end. In an embodiment, when the power source end serial-parallel circuit connects the first power source v_ch1 and the second power source v_ch2 in parallel (the first switch K1 is turned off, the second switch K2 and the third switch K3 are turned on), the first single-pole double-throw switch circuit is electrically connected to the second node B and the seventh node G, the third single-pole double-throw switch circuit is electrically connected to the fifth node E and the tenth node J, the stationary end of the second single-pole double-throw switch circuit is connected to the eighth node H, the first movable end of the second single-pole double-throw switch circuit is connected to the fourth node D and the ninth node I, the second movable end of the second single-pole double-throw switch circuit is connected to the tenth node J, and the stationary end of the second single-pole double-throw switch circuit is connected to the second movable end.
In one embodiment, the double-range single-channel power supply turns on the kelvin four-wire function when the first single-pole double-throw switch circuit is electrically connected to the first node a and the seventh node G, and/or the third single-pole double-throw switch circuit is electrically connected to the sixth node F and the tenth node J.
In an embodiment of the present application, the first power source v_ch1 and the second power source v_ch2 are voltage and current continuously adjustable dc power sources that work relatively independently, and the dual-range single-channel power source can collect and control output voltage and current, and its state is controlled by the system, so as to ensure balance. The positive and negative poles of the output of the first power supply V_CH1 and the second power supply V_CH2 are respectively connected with a second node B, a third node C, a fourth node D and a fifth node E. Kelvin four-wire function (sense function) of a dual range single channel power supply, supporting on or off. The positive and negative cables for remote voltage acquisition are sense+ and Sense-, and are connected with the first node A and the sixth node F respectively. The positive and negative ends of the single-channel external output of the whole machine are Vout+ and Vout-, and are respectively connected with the second node B and the fifth node E. The double-range single-channel power supply is realized by a system control relay for connecting a double first power supply V_CH1 and a double second power supply V_CH2 in series or in parallel, wherein a first switch K1 is connected with a third node C and a fourth node D in series, a second switch K2 is connected with a second node B and a fourth node D in parallel, and a third switch K3 is connected with the third node C and a fifth node E. These relay switches require small contact resistance and rated voltage currents greater than the maximum output voltage current. The voltage readback acquisition paths of the first power supply V_CH1 and the second power supply V_CH2 are designed to be two paths, and are represented by operation symbols U1 (a first acquisition circuit) and U2 (a second acquisition circuit), and positive and negative input ends of the operation symbols are respectively a seventh node G, an eighth node H, a ninth node I and a tenth node J. If the common terminal (the stationary terminal) of the first single pole double throw switch K4 is designated as K4.3, the other side is designated as K4.1 (the first movable terminal) and K4.2 (the second movable terminal), corresponding to the right side interface and the left side up/down interface in fig. 3, 4, 5 and 6, the respective terminals of the second single pole double throw switch K5 and the third single pole double throw switch K6, and so on.
When the four-wire function is disabled by the double-range single-channel power supply, the output acquisition point comprises Vout+/Vout, namely a second node B and a fifth node E; when the four-wire function is turned on, these two points are changed to the far-end voltage readback sense+/Sense-i.e., the two points of the first node A and the sixth node F. The first single-pole switch K4 and the third single-pole switch K6 are set to be controlled to disable/enable the four-wire function. K4.1 is connected to the first node A, K4.2 is connected to the second node B, K6.1 is connected to the fifth node E, and K6.2 is connected to the sixth node F.
When the first power supply V_CH1 and the second power supply V_CH2 are connected in series, the U1/U2 is designed to collect the first power supply V_CH1 and the second power supply V_CH2 respectively, and the voltage drop of the first switch K1 is included in U2 or U1, so that the U1+U2 is ensured to be equal to the collection voltage (Vout+/Vout-or sensor+ and sensor-) output in series. When the first power supply V_CH1 and the second power supply V_CH2 are connected in parallel, the U1 is designed to collect Vout+/Vout-or sense+/Sense-, and the U2 is not concerned. The design is that the single-channel acquisition highest voltage is always the single-module highest voltage, so that the circuit design is facilitated, and the utilization range and the precision of analog-digital/digital-analog conversion are improved. The second single-pole switch K5 is designed to switch the serial/parallel output between the modules.
When the voltage and the current of the whole single-channel power supply are calibrated, the voltage and the current of the first power supply V_CH1 and the second power supply V_CH2 need to be calibrated first. The method comprises the following steps:
1) Four-wire function is disabled, the serial output of the first power supply V_CH1 and the second power supply V_CH2 is set, the two power supplies are turned on, the external load is applied, the current of the two power supplies is equal, and the set current and the read-back current of the two power supplies are calibrated.
2) The first power supply V_CH1 and the second power supply V_CH2 are set to be output in parallel, the first power supply V_CH1 is only turned on, no load exists outside, and the set voltage of the first power supply V_CH1 and the read-back voltage of U1 are calibrated at the moment;
3) Setting the first power supply V_CH1 and the second power supply V_CH2 to be output in parallel, only opening the second power supply V_CH2, and calibrating the set voltage of the second power supply V_CH2 when no load exists outside;
4) The first power supply V_CH1 and the second power supply V_CH2 are arranged to be output in series, the two power supplies are turned on, no load exists outside, and the U2 read-back voltage is calibrated.
In one embodiment, the voltage and current of the whole single-channel power supply can be adjusted and calibrated slightly according to four (serial and parallel) different working states.
The dual-range single-channel power supply disclosed in the embodiment of the application comprises ten nodes used for connection, a power source end serial-parallel circuit, a power output end connecting circuit, a first acquisition circuit, a second acquisition circuit and a first power supply and a second power supply with the same parameters. The power source end serial-parallel circuit is used for connecting a first power source and a second power source in series or in parallel, and the power output end connecting circuit is used for establishing electric connection between the positive electrode and the negative electrode or the far-end voltage readback point of the first power source or the second power source and the first acquisition circuit and the second acquisition circuit through the first single-pole double-throw switch circuit, the second single-pole double-throw switch circuit and the third single-throw switch circuit so as to realize voltage detection of a double-range single-channel power source and start/disable Kelvin four-wire function. The dual output (high voltage small current or high voltage large current) and the on/off Kelvin four-wire function (namely sense function) of the single-channel power supply can be realized through the simple serial-parallel connection and switch connection circuit, and meanwhile, the acquisition and calibration of voltage and current are realized, so that the function is simple to realize, and the operation is easy.
The foregoing description of the utility model has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the utility model pertains, based on the idea of the utility model.
Claims (10)
1. The double-range single-channel power supply with the Kelvin four-wire function is characterized by comprising a first node A, a second node B, a third node C, a fourth node D, a fifth node E, a sixth node F, a seventh node G, an eighth node H, a ninth node I, a tenth node J, a power supply end serial-parallel circuit, a power supply output end connecting circuit, a first acquisition circuit, a second acquisition circuit, a first power supply and a second power supply with the same parameters;
the first node A, the sixth node F, the seventh node G, the eighth node H, the ninth node I and the tenth node J are connected with the power output end connecting circuit; the first node A and the sixth node F are used as a far-end voltage positive readback connection point and a far-end voltage negative readback connection point of the double-range single-channel power supply respectively;
the second node B and the third node C are respectively connected with the positive electrode and the negative electrode of the first power supply;
the fourth node D and the fifth node E are respectively connected with the positive electrode and the negative electrode of the second power supply;
the power source end serial-parallel circuit is used for connecting the first power source and the second power source in series or in parallel so as to realize dual-range output;
the power supply output end connecting circuit comprises a first single-pole double-throw switch circuit, a second single-pole double-throw switch circuit and a third single-pole double-throw switch circuit; the fixed end of the first single-pole double-throw switch circuit is connected with the seventh node G, the first movable end of the first single-pole double-throw switch circuit is connected with the first node A, and the second movable end of the first single-pole double-throw switch circuit is connected with the second node B; the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H and/or the ninth node I, the first movable end of the second single-pole double-throw switch circuit is connected with the third node C, the fourth node D and/or the ninth node I, and the second movable end of the second single-pole double-throw switch circuit is connected with the tenth node J; the fixed end of the third single-pole double-throw switch circuit is connected with the tenth node J, the first movable end of the third single-pole double-throw switch circuit is connected with the fifth node E, and the second movable end of the third single-pole double-throw switch circuit is connected with the sixth node F;
the first acquisition circuit is used for acquiring a voltage value between the seventh node G and the eighth node H;
the second acquisition circuit is used for acquiring a voltage value between the ninth node I and the tenth node J.
2. The dual-range single-channel power supply of claim 1, wherein the power supply source-side series-parallel circuit comprises a first switching circuit, a second switching circuit and a third switching circuit; the first switch circuit is connected between the third node C and the fourth node D; the second switch circuit is connected between the second node B and the fourth node D; the third switching circuit is connected between the third node C and the fifth node E.
3. The dual-range single channel power supply of claim 2, wherein the first, second and third switching circuits comprise a first switch K1, a second switch K2 and a third switch K3, respectively.
4. The dual-range single-channel power supply of claim 3, wherein the first single-pole double-throw switch circuit, the second single-pole double-throw switch circuit, and the third single-pole double-throw switch circuit comprise a first single-pole double-throw switch K4, a second single-pole double-throw switch K5, and a third single-pole double-throw switch K6, respectively.
5. The dual-range single-channel power supply of claim 4, wherein the first switch K1, the second switch K2, the third switch K3, the first single-pole double-throw switch K4, the second single-pole double-throw switch K5, and the third single-pole double-throw switch K6 are relay switches.
6. The dual-range single-channel power supply of claim 1, wherein when the power supply source side series-parallel circuit connects the first power supply and the second power supply in series, the first single-pole double-throw switch circuit electrically connects the second node B and the seventh node G, the third single-pole double-throw switch circuit electrically connects the fifth node E and the tenth node J, and a stationary end of the second single-pole double-throw switch circuit is connected with a first movable end of the second single-pole double-throw switch circuit.
7. The dual-range single-channel power supply of claim 1, wherein when the power supply source side series-parallel circuit connects the first power supply and the second power supply in parallel, the first single-pole double-throw switch circuit electrically connects the second node B and the seventh node G, the third single-pole double-throw switch circuit electrically connects the fifth node E and the tenth node J, and a stationary end of the second single-pole double-throw switch circuit is connected with a second movable end of the second single-pole double-throw switch circuit.
8. The dual-range single-channel power supply of claim 1, wherein the dual-range single-channel power supply turns on the kelvin four-wire function when the first single-pole double-throw switch circuit electrically connects the first node a and the seventh node G, and the third single-pole double-throw switch circuit electrically connects the sixth node F and the tenth node J.
9. The dual-range single channel power supply of claim 1, wherein the power supply comprises a power supply,
the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H and the ninth node I, and the first movable end of the second single-pole double-throw switch circuit is connected with the third node C; or alternatively, the first and second heat exchangers may be,
the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H, and the first movable end of the second single-pole double-throw switch circuit is connected with the third node C and the ninth node I; or alternatively, the first and second heat exchangers may be,
the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H and the ninth node I, and the first movable end of the second single-pole double-throw switch circuit is connected with the fourth node D; or alternatively, the first and second heat exchangers may be,
the fixed end of the second single-pole double-throw switch circuit is connected with the eighth node H, and the first movable end of the second single-pole double-throw switch circuit is connected with the fourth node D and the ninth node I.
10. The dual-range single channel power supply of claim 1, wherein the first acquisition circuit and the second acquisition circuit comprise an operational amplifier circuit and an analog-to-digital conversion circuit, respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322578252.XU CN220798082U (en) | 2023-09-22 | 2023-09-22 | Double-range single-channel power supply with Kelvin four-wire function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322578252.XU CN220798082U (en) | 2023-09-22 | 2023-09-22 | Double-range single-channel power supply with Kelvin four-wire function |
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