CN111884289B - Power supply for loop resistance test and loop resistance tester - Google Patents
Power supply for loop resistance test and loop resistance tester Download PDFInfo
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- CN111884289B CN111884289B CN202010717581.6A CN202010717581A CN111884289B CN 111884289 B CN111884289 B CN 111884289B CN 202010717581 A CN202010717581 A CN 202010717581A CN 111884289 B CN111884289 B CN 111884289B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The embodiment of the invention discloses a power supply for loop resistance test and a loop resistance tester, wherein the power supply comprises: the battery pack, the first capacitor, the charge-discharge circuit and the discharge circuit; the charging and discharging circuit is electrically connected with the battery pack and the first capacitor, and the first capacitor is also electrically connected with the discharging circuit; the charging and discharging circuit is used for transmitting the electric energy of the battery pack to the first capacitor to charge the first capacitor in the first stage; the charging and discharging circuit is also used for connecting the battery pack and the first capacitor in series in the second stage, and the discharging circuit is used for discharging and outputting the electric energy stored by the battery pack and the first capacitor together in the second stage. The technical scheme provided by the embodiment of the invention reduces the number of batteries, lowers the cost and weight, increases the selectivity of the charging capacitor, simplifies the circuit, and is convenient for controlling the charging and discharging circuits.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supply circuits, in particular to a power supply for loop resistance test and a loop resistance tester.
Background
At present, a loop resistance testing instrument adopts a mode of taking electricity from an overhaul power supply box, an overhaul power supply is an alternating current 220V power supply, the output current of the loop resistance testing instrument is generally one hundred amperes to several hundred amperes, the output voltage is usually very low, a transformer is required to be used for reducing the voltage, and a final low-voltage high-current output function is realized by combining an AC-DC (alternating current-direct current) and DC-DC conversion circuit.
The power supply scheme is complex, has heavier volume and weight, is not suitable for outdoor operation, needs to be pulled out from the overhaul power supply box, is inconvenient to operate, and has the risk of causing short circuit of the overhaul power supply, thereby causing potential safety hazards of personal electric shock. In view of this problem, a battery-powered circuit is proposed, fig. 1 is a block diagram of a power supply for loop resistance test provided in the prior art, and referring to fig. 1, the battery-powered circuit includes a battery pack B1, a charging capacitor C, a charging circuit 1 and a discharging circuit 20, the charging circuit 1 is electrically connected with the battery pack B1 and the charging capacitor C, and the charging capacitor C is also electrically connected with the discharging circuit 20. But only by the intermediate charge capacitor C during the discharge phase, whereas the battery pack is disconnected, the charge capacitor C needs to select a supercapacitor capable of providing a high current output capability. Because the battery cells in the battery pack B1 are typically 3-4.2V (polymer lithium battery) or 2.5V-3.7V (lithium iron phosphate battery), the actual output voltage Vo of the battery-powered circuit is often required to be high, the output voltage Vo may reach 0-20V, the discharge-side bus voltage needs to be greater than 10V, and the output current may reach 400A, which results in a larger number of batteries to be provided in the battery pack B1 and increases the cost and weight. In addition, the battery-powered circuit proposed in the related art is cumbersome in controlling the charging circuit 1 and the discharging circuit 20.
Disclosure of Invention
The embodiment of the invention provides a power supply for loop resistance test and a loop resistance tester, which are used for reducing the number of batteries, reducing the cost and weight, increasing the selectivity of a charging capacitor and simplifying a circuit.
In a first aspect, an embodiment of the present invention provides a power supply for loop resistance testing, including:
the battery pack, the first capacitor, the charge-discharge circuit and the discharge circuit;
the charging and discharging circuit is electrically connected with the battery pack and the first capacitor, and the first capacitor is also electrically connected with the discharging circuit;
the charging and discharging circuit is used for transmitting the electric energy of the battery pack to the first capacitor to charge the first capacitor in a first stage; the charging and discharging circuit is also used for connecting the battery pack and the first capacitor in series in a second stage, and the discharging circuit is used for discharging and outputting the electric energy stored by the battery pack and the first capacitor together in the second stage.
Optionally, the charge-discharge circuit includes a first single-pole double-throw switch, a second single-pole double-throw switch, a first semiconductor switch and a second semiconductor switch;
the positive terminal of the battery pack is electrically connected with the common terminal of the first single-pole double-throw switch, and the first end of the first single-pole double-throw switch is electrically connected with the first end of the first capacitor and the first end of the second single-pole double-throw switch; the second end of the first single-pole double-throw switch is electrically connected with the second end of the first capacitor and the second end of the second single-pole double-throw switch; the common end of the second single-pole double-throw switch is electrically connected with the first end of the first semiconductor switch; the second end of the first semiconductor switch is electrically connected with the first end of the second semiconductor switch, and the second end of the second semiconductor switch is electrically connected with the negative electrode end of the battery pack;
the control end of the first semiconductor switch and the control end of the second semiconductor switch are used for inputting control signals.
Optionally, the charge-discharge circuit further includes a diode and a third semiconductor switch, where a second end of the diode is electrically connected to the first end of the first capacitor; the first end of the diode is electrically connected with the first end of the first single-pole double-throw switch and the first end of the third semiconductor switch; the second end of the third semiconductor switch is electrically connected with the negative electrode end of the battery pack; the control end of the third semiconductor switch is used for inputting a control signal.
Optionally, the charge-discharge circuit further includes a first inductor, a first end of the first inductor is electrically connected to the first end of the first single pole double throw switch, and a second end of the first inductor is electrically connected to the first end of the diode and the first end of the third semiconductor switch.
Optionally, the duty cycle of the third semiconductor switch corresponds to the charging voltage of the first capacitor.
Optionally, the discharging circuit includes: a second capacitor, the first semiconductor switch, and the second semiconductor switch; the first end of the second capacitor is electrically connected with the common end of the second single-pole double-throw switch and the first end of the first semiconductor switch; a second end of the second capacitor is electrically connected with the negative end of the battery pack and a second end of the second semiconductor; the connection point of the second end of the first semiconductor and the first end of the second semiconductor is the positive output end of the power supply, and the second end of the second semiconductor is the negative output end of the power supply.
Optionally, the first semiconductor switch and the second semiconductor switch are turned on simultaneously in the first stage; the first semiconductor switch and the second semiconductor switch operate complementarily in the second phase and the duty cycle of the first semiconductor switch and the second semiconductor switch corresponds to the output voltage of the power supply.
Optionally, the discharging circuit further includes a filtering unit, where the filtering unit is configured to filter an ac signal in the power supply.
Optionally, the filtering unit includes a second inductor and a third capacitor;
the first end of the second inductor is electrically connected with the second end of the first semiconductor switch and the first end of the second semiconductor switch; the second end of the second inductor is electrically connected with the first end of the third capacitor, and the second end of the third capacitor is electrically connected with the second end of the second semiconductor switch.
In a second aspect, an embodiment of the present invention provides a loop resistance tester, including a loop resistance tester, and further including a power supply for loop resistance testing as described in any one of the first aspects; the power supply for loop resistance test provides working power for the loop resistance test instrument.
The embodiment of the invention provides a power supply for loop resistance test and a loop resistance tester, wherein the power supply comprises: the battery pack, the first capacitor, the charge-discharge circuit and the discharge circuit; the charging and discharging circuit is electrically connected with the battery pack and the first capacitor, and the first capacitor is also electrically connected with the discharging circuit; the charging and discharging circuit is used for transmitting the electric energy of the battery pack to the first capacitor to charge the first capacitor in the first stage; the charging and discharging circuit is also used for connecting the battery pack and the first capacitor in series in the second stage, and the discharging circuit is used for discharging and outputting the electric energy stored by the battery pack and the first capacitor together in the second stage. According to the technical scheme provided by the embodiment of the invention, the first capacitor is charged in the first stage through the charging and discharging circuit, and the battery pack and the first capacitor are connected in series in the second stage, so that the discharging circuit discharges and outputs the electric energy stored by the battery pack and the first capacitor together in the second stage. The number of batteries is reduced, the cost and the weight are reduced, the selectivity of the charging capacitor is increased, the circuit is simplified, and the charging and discharging circuit and the discharging circuit are conveniently controlled.
Drawings
FIG. 1 is a block diagram of a prior art power supply for loop resistance testing;
FIG. 2 is a block diagram of a power supply for loop resistance testing according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a power supply for loop resistance test according to a second embodiment of the present invention;
FIG. 4 is a circuit diagram of another power supply for loop resistance testing according to the second embodiment of the present invention;
FIG. 5 is a circuit diagram of another power supply for loop resistance testing according to the second embodiment of the present invention;
fig. 6 is a circuit diagram of a power supply for loop resistance test according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
The embodiment of the invention provides a power supply for loop resistance test, fig. 2 is a block diagram of a power supply for loop resistance test according to the first embodiment of the invention, and referring to fig. 2, the power supply includes:
a battery pack B1, a first capacitor C1, a charge-discharge circuit 10, and a discharge circuit 20;
the charge-discharge circuit 10 is electrically connected with the battery B1 and the first capacitor C1, and the first capacitor C1 is also electrically connected with the discharge circuit 20;
the charge-discharge circuit 10 is configured to transfer the electric energy of the battery B1 to the first capacitor C1 to charge the first capacitor C1 in the first stage; the charge-discharge circuit 10 is further configured to connect the battery B1 and the first capacitor C1 in series in the second stage, and the discharge circuit 20 is configured to discharge the electric energy stored in the battery B1 and the first capacitor C1 together in the second stage.
Specifically, the power supply for loop resistance test provided by the embodiment of the invention provides a working power supply for the loop resistance tester. The loop resistance tester stops working after the measured resistor is measured, the power supply does not need to provide energy outwards, the general working time of the loop resistance tester only needs a few seconds, and the intermittent stopping time is often a few minutes or even longer, so that the electric energy of the battery pack B1 can be transmitted to the first capacitor C1 to charge the first capacitor C1 in an intermittent period. The charge-discharge circuit 10 is electrically connected to the battery B1 and the first capacitor C1, and in the first stage, the charge-discharge circuit 10 is controlled to transmit the electric energy of the battery B1 to the first capacitor C1 to charge the first capacitor C1, i.e. the first stage is a charging stage of the first capacitor C1. The charge-discharge circuit 10 is further configured to connect the battery B1 and the first capacitor C1 in series in a second stage, and the discharge circuit 20 is configured to discharge the electric energy stored in the battery B1 and the first capacitor C1 together in the second stage, i.e. the second stage is a stage in which the first capacitor C1 and the battery B1 are discharged together. The battery B1 participates in the discharge, and increases the voltage output from the discharge-side bus bar in the discharge circuit 20, thereby increasing the output voltage Vo of the power supply source, and increasing the charging capacitance, i.e., the selectivity of the first capacitance C1. Meanwhile, the battery pack B1 and the first capacitor C1 participate in discharging together, and according to the principle of conservation of power, when the bus voltage at the discharging side is higher, the current provided from the battery pack B1 is smaller, so that the demand of batteries in the battery pack B1 is reduced, and in the battery pack B1 of this embodiment, a single battery or two batteries can be adopted, and the batteries are generally 3-4.2V (polymer lithium battery) or 2.5-3.7V (lithium iron phosphate battery). According to the power supply for loop resistance test, the battery pack charges the first capacitor C1 in the intermittent working period, and in the discharging stage, the battery pack B1 and the first capacitor C1 are connected in series to discharge a load together, so that the bus voltage on the discharging side is higher, the discharging current of the battery is further reduced, the required quantity of the battery in the battery pack B1 is reduced, the cost and the weight of the power supply for loop resistance test are reduced, and the control of a charging and discharging circuit and a discharging circuit is simplified.
The embodiment of the invention also provides a power supply for loop resistance test, which comprises: the battery pack, the first capacitor, the charge-discharge circuit and the discharge circuit; the charging and discharging circuit is electrically connected with the battery pack and the first capacitor, and the first capacitor is also electrically connected with the discharging circuit; the charging and discharging circuit is used for transmitting the electric energy of the battery pack to the first capacitor to charge the first capacitor in the first stage; the charging and discharging circuit is also used for connecting the battery pack and the first capacitor in series in the second stage, and the discharging circuit is used for discharging and outputting the electric energy stored by the battery pack and the first capacitor together in the second stage. According to the technical scheme provided by the embodiment of the invention, the first capacitor is charged in the first stage through the charging and discharging circuit, and the battery pack and the first capacitor are connected in series in the second stage, so that the discharging circuit discharges and outputs the electric energy stored by the battery pack and the first capacitor together in the second stage. The number of batteries is reduced, the cost and the weight are reduced, the selectivity of the charging capacitor is increased, the circuit is simplified, and the charging and discharging circuit and the discharging circuit are conveniently controlled.
Example two
The embodiment of the invention provides a power supply for loop resistance test, which supplements and refines a charge-discharge circuit on the basis of the first embodiment. Fig. 3 is a circuit diagram of a power supply for loop resistance test according to a second embodiment of the present invention, please refer to fig. 3.
Optionally, the charge-discharge circuit 10 includes a first single-pole double-throw switch S1, a second single-pole double-throw switch S2, a first semiconductor switch Q1, and a second semiconductor switch Q2;
the positive terminal of the battery pack B1 is electrically connected with the common terminal X1 of the first single-pole double-throw switch S1, and the first terminal A of the first single-pole double-throw switch S1 is electrically connected with the first terminal of the first capacitor C1 and the first terminal M of the second single-pole double-throw switch S2; the second end B of the first single-pole double-throw switch S1 is electrically connected with the second end N of the second single-pole double-throw switch S2; the common terminal X2 of the second single-pole double-throw switch S1 is electrically connected with the first terminal of the first semiconductor switch Q1; a second end of the first semiconductor switch Q1 is electrically connected with a first end of the second semiconductor switch Q2, and a second end of the second semiconductor switch Q2 is electrically connected with a negative end of the battery pack B1;
the control terminal of the first semiconductor switch Q1 and the control terminal of the second semiconductor switch Q2 are used for inputting control signals.
Specifically, the charge-discharge circuit 10 includes a first single-pole double-throw switch S1, a second single-pole double-throw switch S2, a first semiconductor switch Q1, and a second semiconductor switch Q2. The first and second single pole double throw switches S1 and S2 may be relays or contactors, etc., and the first and second semiconductor switches Q1 and Q2 may be metal-oxide semiconductor field effect transistors or insulated gate bipolar transistors, etc. When the charge-discharge circuit 10 transfers the electric energy of the battery B1 to the first capacitor C1 to charge the first capacitor C1 in the first stage, it controls to conduct the public switch end X1 of the first single-pole double-throw switch S1 with the first end a of the first single-pole double-throw switch S1, and controls to conduct the public switch end X2 of the second single-pole double-throw switch S2 with the second end N of the second single-pole double-throw switch S2. And a control signal is input through the control end of the first semiconductor switch Q1 and the control end of the second semiconductor switch Q2, so that the first semiconductor switch Q1 and the second semiconductor switch Q2 are conducted; thereby, the battery pack B1, the first capacitor C1, and the first single-pole double-throw switch S1, the second single-pole double-throw switch S2, the first semiconductor switch Q1 and the second semiconductor switch Q2 in the charge-discharge circuit 10 form a closed loop, so that the electric energy of the battery pack B1 is transmitted to the first capacitor C1 to charge the first capacitor C1. When the power supply for loop resistance test provides working power for the loop resistance tester, namely, in the second stage, the power supply controls to conduct the public switch end X1 of the first single-pole double-throw switch S1 and the second end B of the first single-pole double-throw switch S1, controls to conduct the public switch end X2 of the second single-pole double-throw switch S2 and the first end M of the second single-pole double-throw switch S2, and the charge and discharge circuit 10 connects the battery pack B1 and the first capacitor C1 in series in the second stage, so that the discharge circuit 20 discharges and outputs the electric energy stored by the battery pack B1 and the first capacitor C1 together in the second stage. Wherein the first and second semiconductor switches Q1 and Q2 are complementarily operated in the second stage, and the duty ratio of the first and second semiconductor switches Q1 and Q2 corresponds to the output power Vo of the power supply.
Alternatively, fig. 4 is a circuit diagram of another power supply for loop resistance test according to the second embodiment of the present invention, please refer to fig. 4. The charge-discharge circuit further comprises a diode D1 and a third semiconductor switch Q3, wherein the second end of the diode D1 is electrically connected with the first end of the first capacitor C1; a first end of the diode D1 is electrically connected to a first end of the first single pole double throw switch S1 and a first end of the third semiconductor switch Q3; a second terminal of the third semiconductor switch Q3 is electrically connected to the negative terminal of the battery B1; the control terminal of the third semiconductor switch Q3 is used for inputting a control signal.
Specifically, the third semiconductor switch Q3 may be a metal-oxide semiconductor field effect transistor or an insulated gate bipolar transistor, or the like. When the charge-discharge circuit 10 transfers the electric energy of the battery B1 to the first capacitor C1 to charge the first capacitor C1 in the first stage, the third semiconductor switch Q3 is in a high-frequency chopping state, and the control signal input by the control terminal of the third semiconductor switch Q3 makes the third semiconductor switch conduct at a set duty ratio. The duty ratio of the third semiconductor switch Q3 corresponds to the charging voltage of the first capacitor C1, and by adjusting the duty ratio of the third semiconductor switch Q3, the voltage of the first capacitor C1 can be adjusted. When the charge/discharge circuit 10 discharges the battery B1 and the first capacitor C1 in series in the second stage, the control signal input from the control terminal of the third semiconductor switch Q3 turns off the third semiconductor switch Q3. The diode D2 is used to prevent the first capacitor C1 from being discharged due to the connection with the negative electrode of the battery B1 in the first stage, thereby causing the failure of normal charge.
Alternatively, fig. 5 is a circuit diagram of another power supply for loop resistance test according to the second embodiment of the present invention, please refer to fig. 5. The charge-discharge circuit 10 further includes a first inductor L1, where a first end of the first inductor L1 is electrically connected to a first end of the first single pole double throw switch S1, a second end of the first inductor L1 is electrically connected to a first end of the diode D1 and a first end of the third semiconductor switch Q3, and the first inductor L1 is configured to increase a charging voltage of the battery B1 to the first capacitor C1, thereby increasing electric energy stored in the first capacitor C1 after the charging is completed, further enabling a bus voltage on a discharge side to be higher, reducing a discharge current of the battery, and reducing a number of batteries in the battery.
The embodiment of the invention provides a power supply for loop resistance test, which comprises a battery pack, a first capacitor, a charge-discharge circuit and a discharge circuit. The charge-discharge circuit comprises a first single-pole double-throw switch, a second single-pole double-throw switch, a first semiconductor switch and a second semiconductor switch; inputting control signals through the control end of the first semiconductor switch and the control end of the second semiconductor switch to control the conduction state of the charge-discharge circuit; and switching a first stage and a second stage of the power supply through the first single-pole double-throw switch and the second single-pole double-throw switch, namely switching a charging state and a power supply state of the power supply. The control of the charge-discharge circuit and the discharge circuit is simplified. The battery pack further comprises a third semiconductor switch, the voltage of the first capacitor C1 can be adjusted by adjusting the duty ratio of the third semiconductor switch, the bus voltage on the discharging side can be further higher, the discharging current of the battery is reduced, and the number of batteries in the battery pack is reduced.
Example III
The embodiment of the invention provides a power supply for loop resistance test, which is characterized in that a discharging circuit is supplemented and thinned on the basis of the second embodiment, and a filtering unit is added to the power supply for loop resistance test.
Alternatively, please refer to fig. 3-5; the discharging circuit 20 includes a second capacitor C2, a first semiconductor switch Q1, and a second semiconductor switch Q2; the first end of the second capacitor C2 is electrically connected with the common end X2 of the second single-pole double-throw switch S2 and the first end of the first semiconductor switch Q1; the second end of the second capacitor C2 is electrically connected with the negative end of the battery pack B1 and the second end of the second semiconductor Q2; the connection point between the second end of the first semiconductor Q1 and the first end of the second semiconductor Q2 is a positive output end of the power supply, and the second end of the second semiconductor Q2 is a negative output end of the power supply.
Specifically, the second capacitor C2 is a bus capacitor, that is, the voltage values at two ends of the second capacitor C2 are the bus voltage values at the discharge side, and the first end of the second capacitor C2 is electrically connected to the common end X2 of the second single-pole double-throw switch S2 and the first end of the first semiconductor switch Q1; a second terminal of the second capacitor C2 is electrically connected to the negative terminal of the battery B1 and the second terminal of the second semiconductor Q2. The connection point between the second end of the first semiconductor Q1 and the first end of the second semiconductor Q2 is a positive output end of the power supply, and the second end of the second semiconductor Q2 is a negative output end of the power supply. When the second stage, i.e. the power supply of the loop resistance test, supplies working power to the loop resistance tester, the public switch end X1 of the first single-pole double-throw switch S1 of the charge-discharge circuit 10 is conducted with the second end B of the first single-pole double-throw switch S1, the public switch end X2 of the second single-pole double-throw switch S2 is conducted with the first end M of the second single-pole double-throw switch S2, the battery pack B1 and the first capacitor C1 are connected in series, and the sum of electric energy supplied by the battery pack B1 and the first capacitor C1 is supplied to the first end of the second capacitor C2. At this time, the first semiconductor switch Q1 and the second semiconductor switch Q2 are complementarily operated at high frequency in the second stage, so that the power actually output by the power supply corresponds to the duty ratio of the first semiconductor switch Q1 and the second semiconductor switch Q2, that is, the duty ratio of the first semiconductor switch Q1 and the second semiconductor switch Q2 can adjust the voltage value output by the second capacitor C2.
The first semiconductor switch Q1 and the second semiconductor switch Q2 are turned on simultaneously in the first stage, and the charge/discharge circuit 10 is turned on to charge the first capacitor C1. The first and second semiconductor switches Q1 and Q2 complementarily operate in the second stage, and the adjustment of the output voltage Vo and the output current is achieved by adjusting the duty ratio of the first and second semiconductor switches Q1 and Q2. The charge-discharge circuit 10 and the discharge circuit 20 share the first semiconductor switch Q1 and the second semiconductor switch Q2, so that the number of devices in the power supply for loop resistance test is further reduced, the cost is reduced, and the control of the circuit is simplified.
Optionally, fig. 6 is a circuit diagram of a power supply for loop resistance test according to the third embodiment of the present invention, and referring to fig. 6, the discharging circuit 20 further includes a filtering unit 21, where the filtering unit 21 is configured to filter an ac signal in the power supply.
Optionally, the filtering unit 21 includes a second inductor L2 and a third capacitor C3; the first end in the second inductor is electrically connected with the second end of the first semiconductor switch Q1 and the first end of the second semiconductor switch Q2; the second end of the second inductor L2 is electrically connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is electrically connected to the second end of the second semiconductor switch Q2. The second inductor L2 and the third capacitor C3 may form a filter, to filter out secondary ripple generated when the first semiconductor switch Q1 and the second semiconductor switch Q2 work complementarily at high frequency in the second stage, so as to filter out an ac signal in the power supply, and obtain a dc output at the output side.
For example, referring to fig. 6, when the first capacitor C1 is charged in the first stage, the first semiconductor switch Q1 and the second semiconductor switch Q2 are both turned on, the first single-pole double-throw switch S1 communicates with the common terminal X1 and the first terminal a, the second single-pole double-throw switch S2 communicates with the common terminal X2 and the second terminal N, and the third semiconductor switch Q3 is in the high-frequency chopping state, and the voltage of the first capacitor C1 is determined based on the following steps:
VC 1=vb/(1-D1), where VC1 is the voltage of the first capacitor C1, vb is the voltage of the battery pack, and D1 is the duty ratio of the third semiconductor switch Q3.
When the second stage provides working power for the loop resistance testing instrument, the charging and discharging circuit and the discharging circuit work simultaneously, the first single-pole double-throw switch S1 is communicated with the common end X1 and the second end B, the second single-pole double-throw switch S2 is communicated with the common end X2 and the first end M, the third semiconductor switch Q3 is in an off state, the battery pack and the first capacitor C1 are in series connection, and the voltage of the second capacitor C2 is determined based on the following steps:
VC2＝(Vb+VC1)。
at this time, the first semiconductor switch Q1 and the second semiconductor switch Q2 work complementarily at high frequency, and the output voltage is determined based on the following steps after the second inductor L2 and the third capacitor C3 form a filter to filter out the secondary ripple of the high frequency switch and obtain the dc output at the output side:
vo=vc2×d2= (vb+vc1) ×d2; wherein the duty cycle of the D2 first semiconductor switch Q1 is that Vo is the output voltage of the power supply source for the loop resistance test.
By adjusting the duty ratio D2 of the first semiconductor switch Q1, the output voltage and the output current can be adjusted. From conservation of energy, the battery pack discharge current is determined based on:
ib=io×vo/vc2=io×vo/(vb+vc1); wherein I is b Discharging current for the battery.
As can be seen from this equation, the current of the battery pack during the discharging phase can be reduced by increasing the voltage of the first capacitor C1, and the initial voltage of the first capacitor C1 can be achieved by adjusting the duty ratio D1 of the third semiconductor switch Q3 during the charging phase of the first capacitor C1. For example, the output voltage of the power supply for loop resistance test is 10V at maximum and the output current is 200A at maximum. Two polymer lithium batteries are connected in series to form a battery pack (the voltage range is 6V-8.4V), and the second capacitor C2 voltage VC2 can be defined as: vc2=vo×io/ib=10×200/50 v=40v, the voltage of the first capacitor C1 is 31.6V to 34V. Since the voltage of the capacitor C1 will slightly drop during the discharging process, a certain margin is taken, so that the voltage of the first capacitor C1 can be set to be higher, the voltage of the second capacitor C2 can be ensured to be higher than 40V all the time during the discharging process, the voltage of the first capacitor C1 can be 36V-42V, and the voltage can be completely obtained by adjusting the duty ratio of the third semiconductor switch Q3 during the charging stage of the first capacitor. Therefore, the battery pack (the voltage range is 6V-8.4V, and the maximum discharge current is 50A) formed by the two batteries can realize the output of maximum output of 10V and maximum current of 200A through the circuit of the embodiment of the invention.
The embodiment of the invention provides a power supply for loop resistance test, which comprises the following components: the battery pack, the first capacitor, the charge-discharge circuit and the discharge circuit supplement and refine the discharge circuit, and a filter unit is added to a power supply for loop resistance test, so that alternating current signals in the power supply are filtered, and direct current output is obtained at an output side. The charge-discharge circuit and the discharge circuit share the first semiconductor switch and the second semiconductor switch, so that the number of devices in the power supply for loop resistance test is further reduced, the cost is reduced, and the control of the circuit is simplified.
Example IV
The embodiment of the invention provides a loop resistance tester, which comprises a loop resistance tester and a power supply for loop resistance testing, wherein the power supply comprises a power supply unit, a power supply unit and a power supply unit; the power supply for loop resistance test provides working power for the loop resistance test instrument, and has the same technical effects, and the description is omitted here.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. A power supply for loop resistance testing, comprising:
the battery pack, the first capacitor, the charge-discharge circuit and the discharge circuit;
the charging and discharging circuit is electrically connected with the battery pack and the first capacitor, and the first capacitor is also electrically connected with the discharging circuit;
the charging and discharging circuit is used for transmitting the electric energy of the battery pack to the first capacitor to charge the first capacitor in a first stage; the charging and discharging circuit is also used for connecting the battery pack and the first capacitor in series in a second stage, and the discharging circuit is used for discharging and outputting the electric energy stored by the battery pack and the first capacitor together in the second stage; the charge-discharge circuit comprises a first single-pole double-throw switch, a second single-pole double-throw switch, a first semiconductor switch and a second semiconductor switch;
the positive terminal of the battery pack is electrically connected with the common terminal of the first single-pole double-throw switch, and the first end of the first single-pole double-throw switch is electrically connected with the first end of the first capacitor and the first end of the second single-pole double-throw switch; the second end of the first single-pole double-throw switch is electrically connected with the second end of the first capacitor and the second end of the second single-pole double-throw switch; the common end of the second single-pole double-throw switch is electrically connected with the first end of the first semiconductor switch; the second end of the first semiconductor switch is electrically connected with the first end of the second semiconductor switch, and the second end of the second semiconductor switch is electrically connected with the negative electrode end of the battery pack;
the control end of the first semiconductor switch and the control end of the second semiconductor switch are used for inputting control signals;
the discharge circuit includes: a second capacitor, the first semiconductor switch, and the second semiconductor switch; the first end of the second capacitor is electrically connected with the common end of the second single-pole double-throw switch and the first end of the first semiconductor switch; the second end of the second capacitor is electrically connected with the negative end of the battery pack and the second end of the second semiconductor switch; the connection point of the second end of the first semiconductor switch and the first end of the second semiconductor switch is the positive output end of the power supply, and the second end of the second semiconductor switch is the negative output end of the power supply;
the first semiconductor switch and the second semiconductor switch are conducted and work simultaneously in the first stage; the first semiconductor switch and the second semiconductor switch operate complementarily in the second phase and the duty cycle of the first semiconductor switch and the second semiconductor switch corresponds to the output voltage of the power supply.
2. The power supply for loop resistance testing of claim 1, wherein the charge-discharge circuit further comprises a diode and a third semiconductor switch, the second end of the diode being electrically connected to the first end of the first capacitor; the first end of the diode is electrically connected with the first end of the first single-pole double-throw switch and the first end of the third semiconductor switch; the second end of the third semiconductor switch is electrically connected with the negative electrode end of the battery pack; the control end of the third semiconductor switch is used for inputting a control signal.
3. The power supply for loop resistance testing of claim 2, wherein the charge-discharge circuit further comprises a first inductor, a first end of the first inductor being electrically connected to the first end of the first single pole double throw switch, a second end of the first inductor being electrically connected to the first end of the diode and the first end of the third semiconductor switch.
4. A power supply for loop resistance testing according to claim 2 or 3, characterized in that the duty cycle of the third semiconductor switch corresponds to the charging voltage of the first capacitor.
5. The loop resistance test power supply of claim 1, wherein the discharge circuit further comprises a filter unit for filtering alternating current signals in the power supply.
6. The power supply for loop resistance testing according to claim 5, wherein the filter unit comprises a second inductor and a third capacitor;
the first end of the second inductor is electrically connected with the second end of the first semiconductor switch and the first end of the second semiconductor switch; the second end of the second inductor is electrically connected with the first end of the third capacitor, and the second end of the third capacitor is electrically connected with the second end of the second semiconductor switch.
7. A loop resistance tester, comprising a loop resistance tester, further comprising a power supply for loop resistance testing according to any one of claims 1-6; the power supply for loop resistance test provides working power for the loop resistance test instrument.
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