A circuit structure for automatically calibrating the positive and negative poles of a power supply

Abstract

The utility model discloses a circuit structure for automatically calibrating the positive and negative poles of a power supply, including a positive pole, a negative pole of a power supply, a load, a selection circuit, a signal flip circuit and a reset function circuit; the selection circuit includes a first switch chip and a second switch chip; the first switch chip and the second switch chip are both provided with CH1, CH0, SEL and COM, and have a power supply; the circuit in parallel with the SEL of the first switch chip and the second switch chip is provided with a relay KA1 normally closed switch and a normally open switch connected in parallel with 5V and the negative pole of the power supply respectively; the two levels of the load are respectively connected with the COM of the first switch chip and the second switch chip through the first circuit and the second circuit; the signal flip circuit includes a first comparison chip, a diode and a relay KA1; the reset function circuit includes a second comparison chip, a relay KA2, a reset switch assembly and a voltage divider circuit. The utility model can quickly and effectively complete the electrical test of the touch screen, with high process efficiency and long service life.

Description

Technical Field

[0001] The utility model relates to a circuit structure, in particular to a circuit structure for automatically calibrating positive and negative poles of a power supply. Background Art

[0002] When conducting electrical tests on conventional touch screen products, the positive pole of the product needs to be connected to the positive pole of the circuit, and the negative pole of the product needs to be connected to the negative pole of the circuit, so that the product can be tested normally.

[0003] However, in actual connection, when the positive pole of the product is connected to the negative pole of the circuit or the negative pole of the product is connected to the positive pole of the circuit, the positive and negative poles of the product do not match the positive and negative poles of the circuit, resulting in a short circuit in the circuit and failure to work normally. The product cannot perform normal electrical testing and needs to readjust the connection direction of the positive and negative poles of the product, which prolongs the electrical testing time and reduces the process efficiency. At the same time, after the positive and negative poles are connected, the positive and negative poles need to be reconnected again. Multiple plugging and unplugging affect the service life of the electrical testing fixture, which brings many inconveniences to the actual testing. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and to provide a circuit structure for automatically calibrating the positive and negative poles of a power supply, which can automatically adjust the positive and negative poles of the circuit to adapt to the positive and negative poles of the product, thereby increasing the service life of the electrical measuring fixture and making operation convenient and labor-saving.

[0005] To achieve the above object, the technical solution adopted by the utility model is: a circuit structure for automatically calibrating the positive and negative poles of a power supply, including a positive pole, a load, a selection circuit, a signal flip circuit and a reset function circuit;

[0006] The selection circuit includes a first switch chip and a second switch chip; the first switch chip and the second switch chip are both provided with CH1, CH0, SEL and COM, and have a power supply; the positive electrode is connected to the CH1 and CHO terminals of the first switch chip, and the CH1 and CH0 terminals of the second switch chip are respectively connected to the lines connecting CH0 and CH1 of the first switch chip and the positive electrode; the parallel SEL lines of the first switch chip and the second switch chip are provided with a relay KA1 normally closed switch and a relay KA1 normally open switch arranged in parallel; the relay KA1 normally closed switch and the relay KA1 normally open switch are respectively connected to 5V and the negative electrode of the power supply;

[0007] One pole of the load is connected to the COM of the first switch chip through a first circuit, and the other pole is connected to the COM of the second switch chip through a second circuit;

[0008] The signal flipping circuit includes a first comparison chip, a diode and a relay KA1; the positive pole of the input end of the first comparison chip is connected to the second circuit, and the output end of the first comparison chip is connected to the diode; the output end of the diode is connected to the relay KA1, and the other end of the relay KA1 is connected to the ground end of the first comparison chip;

[0009] The reset function circuit includes a second comparison chip, a relay KA2, a reset switch component and a voltage divider circuit; the negative electrode of the input end of the second comparison chip is connected to the second circuit; the output end of the second comparison chip is connected to the relay KA2, and the other end of the relay KA2 is connected to the ground end of the second comparison chip; the positive electrode of the input end of the second comparison chip is connected to the output end of the voltage divider circuit; the output end of the voltage divider circuit is connected to the reset switch component; the other end of the reset switch component is arranged between the diode and the circuit of the relay KA1;

[0010] The negative input terminal of the first comparison chip, the voltage divider circuit and the second comparison chip are all provided with voltage by the 5V of the first comparison chip.

[0011] Furthermore, the first switch chip and the second switch chip are both single-pole double-throw switch chips.

[0012] Furthermore, the first comparison chip and the second comparison chip are each composed of four groups of positive input terminals and negative input terminals.

[0013] Furthermore, the reset switch includes a normally open switch of relay KA1 and a normally closed switch of relay KA2 arranged in series; one end of the normally closed switch of relay KA2 is arranged between the diode and the line between relay KA1, and the normally open switch of relay KA1 is connected to the voltage divider circuit and samples from the first line.

[0014] Furthermore, the divided voltage includes two resistors connected in series.

[0015] Furthermore, the load is a touch screen.

[0016] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0017] The utility model discloses a circuit structure for automatically calibrating the positive and negative poles of a power supply, controls the opening and closing of relays KA1 and KA2 by setting a first comparison chip and a second comparison chip, and controls the SEL pins in the first switch chip and the second switch chip to select 5V or grounding by the opening and closing of the relays KA1 and KA2, thereby realizing the switching of different channels CH1 and CH2 in the first switch chip and the second switch chip, so that no matter whether the positive and negative poles of the product are connected together with the corresponding positive and negative poles of the circuit, the electrical test of the touch screen can be completed, and a circuit short circuit will not be caused, which greatly improves the process efficiency; at the same time, there is no need to repeatedly plug and unplug to change the connection direction, which improves the service life of the electrical testing fixture and meets the actual use needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0019] Figure 1 A circuit diagram of a circuit structure for automatically calibrating the positive and negative poles of a power supply in one embodiment of the utility model;

[0020] Figure 2 A circuit diagram of a selection circuit in an embodiment of the utility model;

[0021] Figure 3 This is a circuit diagram of a signal flipping circuit in an embodiment of the utility model;

[0022] Figure 4 This is a circuit diagram of a reset function circuit in an embodiment of the utility model;

[0023] Among them: 1. load; 2. selection circuit; 3. signal flip circuit; 4. reset function circuit; 5. positive pole; 10. first circuit; 11. second circuit; 21. first switch chip; 22. second switch chip; 31. first comparison chip; 32. diode; 40. second comparison chip; 41. voltage divider circuit; 60. relay KA1 normally closed switch; 61. relay KA1 normally open switch; 62. relay KA2 normally closed switch. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] The utility model provides a circuit structure for automatically calibrating the positive and negative poles of a power supply to solve the problem in the prior art that when the positive and negative poles of a product do not match the positive and negative poles of a circuit, the circuit short-circuit occurs and the product cannot work normally, and the product cannot perform normal electrical testing. It is necessary to readjust the connection direction of the positive and negative poles of the product, which prolongs the electrical testing time and reduces the process efficiency. At the same time, after the positive and negative poles are connected, the positive and negative poles need to be reconnected again, and repeated plugging and unplugging affects the service life of the electrical testing fixture.

[0026] For ease of understanding, the specific process in the embodiments of the present application is described below. Figure 1 A circuit structure for automatically calibrating the positive and negative poles of a power supply in an embodiment of the present application includes a positive pole 5, a load 1, a selection circuit 2, a signal flip circuit 3 and a reset function circuit 4.

[0027] based on Figure 1 and Figure 2 The selection circuit 2 includes a first switch chip 21 and a second switch chip 22; the first switch chip 21 and the second switch chip 22 are both provided with CH1, CH0, SEL and COM, and have a power supply; wherein SEL is a selection pin, when SEL is at a low level, CH0 and COM are turned on; when SEL is at a high level, CH1 and COM are turned on.

[0028] The positive electrode 1 is connected to the CH1 and CHO terminals of the first switch chip 21, and the CH1 and CH0 terminals of the second switch chip 22 are respectively connected to the circuits connecting CH0 and CH1 of the first switch chip 21 and the positive electrode 5; a relay KA1 normally closed switch 60 and a relay KA1 normally open switch 61 arranged in parallel are provided on the parallel circuit of SEL of the first switch chip 21 and the second switch chip 22; the relay KA1 normally closed switch 60 and the relay KA1 normally open switch 61 are respectively connected to 5V and the negative electrode of the power supply.

[0029] based on Figure 1 One pole of the load 1 is connected to the COM of the first switch chip 21 through the first line connection 10, and the other pole is connected to the COM of the second switch chip 22 through the second line 11. The load 1 is an electronic component connected to the positive pole and the negative pole and has a certain potential difference. It is a device for converting electrical energy into other forms of energy. The electronic component in this embodiment is a touch screen product.

[0030] based on Figure 1 and Figure 3The signal flip circuit 3 in this embodiment includes a first comparison chip 31, a diode 32 and a relay KA1; the first comparison chip 31 is composed of four groups of comparators and power supplies, 1IN+, 1IN-, 1OUT constitute the first group of comparators, 2IN+, 2IN-, 2OUT constitute the second group of comparators, 3IN+, 3IN-, 3OUT constitute the third group of comparators, 4IN+, 4IN-, 4OUT constitute the fourth group of comparators, GND and 5V constitute the power supply, wherein IN+ represents the positive pole of the input terminal, and IN- represents the negative pole of the input terminal; when IN+>IN-, the output is high level; when IN+<IN-, the output is low level.

[0031] In this embodiment, the positive pole of any input terminal of the first comparison chip 31 is connected to the second circuit 11, and the output terminal of the first comparison chip 31 is connected to the diode 32; the output terminal of the diode 32 is connected to the relay KA1, and the other end of the relay KA1 is connected to the ground terminal of the first comparison chip 31; when the relay KA1 is powered on, the normally open switch will be closed and the normally closed switch will be opened; the diode 32 plays a unidirectional conduction role, and only allows current to flow from the first comparison chip 31 to the relay KA1, so as to avoid damage to the first comparison chip 31 caused by backflow.

[0032] based on Figure 1 , Figure 3 and Figure 4 In this embodiment, the reset function circuit 4 includes a second comparison chip 40, a relay KA2, a reset switch component and a voltage divider circuit 41; the second comparison chip 40 has the same structure as the first comparison chip 31, and is also composed of four groups of comparators and power supplies, 1IN+, 1IN-, 1OUT constitute the first group of comparators, 2IN+, 2IN-, 2OUT constitute the second group of comparators, 3IN+, 3IN-, 3OUT constitute the third group of comparators, 4IN+, 4IN-, 4OUT constitute the fourth group of comparators, GND and 5V constitute the power supply, IN+ represents the positive pole of the input terminal, and IN- represents the negative pole of the input terminal.

[0033] The negative pole of the input end of the second comparison chip 40 is connected to the second circuit 11; the output end of the second comparison chip 40 is connected to the relay KA2, and the other end of the relay KA2 is connected to the ground end of the second comparison chip 40; the positive pole of the input end of the second comparison chip 40 is connected to the output end of the voltage divider circuit 41; the output end of the voltage divider circuit is connected to the reset switch component; the other end of the reset switch component is arranged between the diode and the circuit of the relay KA1.

[0034] Among them, the voltage dividing circuit 41 includes two resistors connected in series. The voltage dividing circuit continuously provides a voltage of approximately 5 * 1 / (1 + 10) = 0.45V for pin 7 of the second comparator chip. Pin 7 of the second comparator chip is the positive terminal of one of the inputs in the second comparator chip. Among them, the voltage of the voltage dividing circuit 41 is obtained from the 5V of the first comparator chip. When the relay KA2 is energized, the normally open switch will close and the normally closed switch will open; when IN+ > IN-, the second comparator chip 40 outputs a high level; when IN+ < IN-, the second comparator chip 40 outputs a low level.

[0035] Meanwhile, the negative terminal of the input of the first comparator chip 31, the voltage dividing circuit 41, and the second comparator chip 40 are all supplied with voltage by the 5V of the first comparator chip.

[0036] Furthermore, the reset switch includes the normally open switch 61 of the relay KA1 and the normally closed switch 62 of the relay KA2 connected in series; one end of the normally closed switch of the relay KA2 is arranged on the line between the diode and the relay KA1. The normally open switch of the relay KA1 is connected to the voltage dividing circuit and samples from the first line.

[0037] Based on Figures 1 to 4 , the specific working principle is as follows:

[0038] 1. When the circuit is unloaded, that is, there is no load and no current flows out of the load, then there is no current in the entire circuit.

[0039] At this time, the voltage of pin 6 of the second comparator chip 40 is 0V, and the voltage of pin 7 is provided by the voltage dividing circuit. Among them, pin 6 and pin 7 are respectively the negative terminal and the positive terminal of the input of the second comparator chip 40. The voltage dividing circuit is connected to the 5V voltage in the first comparator chip 31, so the voltage at pin 7 is 5 * 1 / (1 + 10) = 0.45V. Therefore, IN+ > IN-, and the 1 OUT of the second comparator chip 40 outputs a high level, and the relay KA2 starts. When the relay KA2 starts, the normally closed switch 62 of the relay KA2 becomes normally open.

[0040] The voltage of pin 6 of the first comparator chip 31 is 5V provided by the 5V voltage of the first comparator chip, and the voltage of pin 7 is 0V. Because the seventh pin is connected to the second line 11 and there is no current on the second line 11, it is 0V. So IN+ < IN-, then the 1 OUT of the first comparator chip 31 outputs a low level, the relay KA1 does not start, and the relay KA1 remains unchanged. The normally closed switch 60 of the corresponding relay KA1 in the selection circuit 2 is in the closed state, and the normally open switch 61 of the relay KA1 is in the open state. Then SEL in the first switch chip 21 is at a high level. When SEL is at a high level, CH1 and COM are conducted, and the positive electrode 5 is connected to CH1. The right - hand side line is unloaded and in a floating state.

[0041] 2. When the circuit is connected to the load with the correct polarity, the wiring is correct at this time.

[0042] At this time, the load current is not greater than 300 mA, the voltage at the 6th pin of the second comparator chip 40 is about 3 V, IN+ < IN-, 1OUT outputs a low level, and the relay KA2 does not start.

[0043] The voltage at the 7th pin of the first comparator chip 31 is about 3 V, IN+ < IN-, 1OUT outputs a low level, the relay KA1 does not start, the SEL pin of the first switch chip 1 still selects 5 V, and the channel CH1 remains valid. At this time, the COM in the first switch chip 21 serves as the positive power supply.

[0044] At the same time, the SEL of the second switch chip 22 also selects a high level. Therefore, similarly, the second switch chip 22 is valid for CH1. However, the CH1 channel in the second switch chip 22 is connected to the CHO channel in the first switch chip, and the CHO channel in the first switch chip is in the off state at this time. In this way, the COM in the second switch chip 22 at this time serves as the negative power supply.

[0045] 3. When the circuit is connected to the load with the wrong polarity, the wiring is incorrect at this time.

[0046] Due to the reverse connection, the current in the entire circuit becomes larger > 1 A at this time, the voltage at the 6th pin of the second comparator chip 40 > 10 V, IN+ < IN-, 1OUT outputs a low level, and the relay KA2 does not start.

[0047] The voltage at the 7th pin of the first comparator chip 31 > 10 V, IN+ > IN-, 1OUT outputs a high level, the relay KA1 starts, the normally closed switch of the relay KA1 opens, the normally open switch closes, the relay KA1 completes self-locking, the SEL of the first switch chip 21 disconnects 5 V and connects to GND, the CH1 channel fails, and the CH0 channel becomes valid, completing the flip of the CH1 channel and the CH0 channel in the second switch chip.

[0048] At this time, the first switch chip selects a low level, and the CHO and COM in the first switch chip are conducting; the CH0 and COM in the second switch chip are conducting. At the same time, the CH0 channel in the second switch chip is connected to the positive 5 V; in this way, the COM of the first switch chip serves as the negative power supply, and the COM of the second switch chip serves as the positive power supply.

[0049] The current in the circuit is normal at 300 mA, the second comparator chip 40 remains unchanged, the voltage at the 7th pin of the first comparator chip 31 is about 3 V, IN+ < IN-, 1OUT outputs a low level. Due to the presence of the diode, the current will not flow back into the second comparator chip 40. Since the relay KA1 has self-locked, it can maintain the starting state.

[0050] When the electrical test of the touch screen is completed, the touch screen product is removed, that is, it returns to the no-load state, the relay KA2 is started, the normally closed switch 62 of the relay KA2 is opened, the relay KA1 loses power, returns to the initial state, and the next touch screen product can be tested.

[0051] In summary, the circuit structure of the utility model that automatically calibrates the positive and negative poles of the power supply can complete the electrical test of the touch screen regardless of whether the product is connected to the positive pole of the circuit or the negative pole of the product is connected to the negative pole of the circuit, without causing a short circuit, thus greatly improving the process efficiency. At the same time, even if the positive pole of the touch screen product is connected to the negative pole of the circuit, the electrical test can be completed without repeatedly plugging and unplugging to change the connection direction, thus increasing the service life of the electrical test fixture and meeting the actual use needs.

[0052] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A circuit structure for automatically calibrating the positive and negative poles of a power supply, characterized in that: It includes a positive electrode, a load, a selection circuit, a signal flip circuit and a reset function circuit; The selection circuit includes a first switch chip and a second switch chip; the first switch chip and the second switch chip are both provided with CH1, CH0, SEL and COM, and have a power supply; the positive electrode is connected to the CH1 and CHO terminals of the first switch chip, and the CH1 and CH0 terminals of the second switch chip are respectively connected to the lines connecting CH0 and CH1 of the first switch chip and the positive electrode; the parallel SEL lines of the first switch chip and the second switch chip are provided with a relay KA1 normally closed switch and a relay KA1 normally open switch arranged in parallel; the relay KA1 normally closed switch and the relay KA1 normally open switch are respectively connected to 5V and the negative electrode of the power supply; One pole of the load is connected to the COM of the first switch chip through a first circuit, and the other pole is connected to the COM of the second switch chip through a second circuit; The signal flipping circuit includes a first comparison chip, a diode and a relay KA1; the positive pole of the input end of the first comparison chip is connected to the second circuit, and the output end of the first comparison chip is connected to the diode; the output end of the diode is connected to the relay KA1, and the other end of the relay KA1 is connected to the ground end of the first comparison chip; The reset function circuit includes a second comparison chip, a relay KA2, a reset switch component and a voltage divider circuit; the negative electrode of the input end of the second comparison chip is connected to the second circuit; the output end of the second comparison chip is connected to the relay KA2, and the other end of the relay KA2 is connected to the ground end of the second comparison chip; the positive electrode of the input end of the second comparison chip is connected to the output end of the voltage divider circuit; the output end of the voltage divider circuit is connected to the reset switch component; the other end of the reset switch component is arranged between the diode and the circuit of the relay KA1; The negative input terminal of the first comparison chip, the voltage divider circuit and the second comparison chip are all provided with voltage by the 5V of the first comparison chip.

2. The circuit structure for automatically calibrating the positive and negative poles of a power supply as claimed in claim 1, characterized in that: The first switch chip and the second switch chip are both single-pole double-throw switch chips.

3. The circuit structure for automatically calibrating the positive and negative poles of a power supply as claimed in claim 1, characterized in that: The first comparison chip and the second comparison chip are both composed of four groups of positive input terminals and negative input terminals.

4. The circuit structure for automatically calibrating the positive and negative poles of a power supply as claimed in claim 1, characterized in that: The reset switch includes a normally open switch of relay KA1 and a normally closed switch of relay KA2 arranged in series; one end of the normally closed switch of relay KA2 is arranged between the diode and the line between relay KA1, and the normally open switch of relay KA1 is connected to the voltage divider circuit and samples from the first line.

5. The circuit structure for automatically calibrating the positive and negative poles of a power supply as claimed in claim 1, characterized in that: The voltage divider includes two resistors arranged in series.

6. The circuit structure for automatically calibrating the positive and negative poles of a power supply as claimed in claim 1, characterized in that: The load is a touch screen.

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