Polarization test circuit and equipment

Abstract

The utility model relates to the technical field of integrated circuits, and further relates to a polarization test circuit and equipment. The circuit comprises a high-voltage test device which is connected with an ultrasonic transducer through a polarization circuit board and is used for carrying out a polarization test on the ultrasonic transducer; the anti-reverse-connection circuit is arranged on the polarized circuit board, the anti-reverse-connection circuit is connected with the high-voltage test equipment through an input port of the polarized circuit board, and the anti-reverse-connection circuit is connected with the ultrasonic transducer through an output port of the polarized circuit board; and when the high-voltage test equipment performs a polarization test on the ultrasonic transducers, the anti-reverse connection circuit is used for preventing the input reverse connection of the high-voltage test equipment, so that the polarities of the ultrasonic transducers of the same model are the same. According to the circuit, the consistency of polarization directions is ensured, so that the consistency and reliability of product performance are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of integrated circuits, and further relates to a polarization test circuit and device. BACKGROUND

[0002] At present, when an ultrasonic transducer is polarized, the piezoelectric material in the ultrasonic transducer is usually divided into array elements, and then a high-voltage test device is used to polarize the piezoelectric material. However, in actual operation, there is a potential risk. Since the step of connecting the electrode of the high-voltage test device to the input port (or polarity lead terminal) of the polarization circuit board is completed manually, human error may occur. Such an error may cause the same array element of the same type of ultrasonic transducer to have opposite polarities. Although the polarization operation can still be performed in this case, due to the inconsistency of the polarization direction, the consistency and reliability of the performance of the products are greatly reduced. CONTENT OF THE UTILITY MODEL

[0003] In order to solve the above technical problems, the present application provides a polarization test circuit and device, which ensures the consistency of the polarization direction, thereby improving the consistency and reliability of the performance of the products.

[0004] In a first aspect, the present application provides a polarization test circuit, comprising: a high-voltage test device, the high-voltage test device being connected to an ultrasonic transducer through a polarization circuit board, and being used to polarize the ultrasonic transducer; an anti-reverse connection circuit, the anti-reverse connection circuit being arranged on the polarization circuit board, and the anti-reverse connection circuit being connected to the high-voltage test device through an input port of the polarization circuit board, and being connected to the ultrasonic transducer through an output port of the polarization circuit board; when the high-voltage test device polarizes the ultrasonic transducer, the anti-reverse connection circuit is used to prevent the input of the high-voltage test device from being reversed, so that the polarities of the ultrasonic transducers of the same type are the same.

[0005] The above polarization test circuit, by arranging an anti-reverse connection circuit on the polarization circuit board, can prevent the input of the high-voltage test device from being reversed when the high-voltage test device polarizes the ultrasonic transducer, so that the polarities of the ultrasonic transducers of the same type are the same. The circuit ensures the consistency of the polarization direction, thereby improving the consistency and reliability of the performance of the products.

[0006] In one implementation, the input port of the polarization circuit board includes a first input port and a second input port, and the output port of the polarization circuit board includes a first output port and a second output port; when the high-voltage testing device performs the direct current polarization test on the ultrasonic transducer, the reverse connection prevention circuit includes a diode; the anode of the diode is connected to the high-voltage testing device through the first input port, and the cathode of the diode is connected to the ultrasonic transducer through the first output port; the second input port is connected to the high-voltage testing device, and the second output port is connected to the ultrasonic transducer.

[0007] In one implementation, the input port of the polarization circuit board includes a first input port and a second input port, and the output port of the polarization circuit board includes a first output port and a second output port; when the high-voltage testing device performs the direct current polarization test on the ultrasonic transducer, the reverse connection prevention circuit includes a diode and a fuse; one end of the fuse is connected to the high-voltage testing device through the first input port, and the other end of the fuse is connected to the ultrasonic transducer through the first output port; the cathode of the diode is connected to the fuse and the first output port respectively, the anode of the diode is connected to the high-voltage testing device through the second input port, and the anode of the diode is also connected to the ultrasonic transducer through the second output port.

[0008] The above polarization test circuit sets the reverse connection prevention circuit as a diode or a combination of a diode and a fuse when the high-voltage testing device performs the direct current polarization test on the ultrasonic transducer. The input reverse connection of the high-voltage testing device can be prevented, so that the polarity of ultrasonic transducers of the same model is the same, thereby improving the consistency and reliability of product performance. At the same time, due to the setting of the diode, damage to the rear-end circuit caused by the input reverse connection of the high-voltage testing device is effectively prevented.

[0009] In one implementation, the input port of the polarization circuit board includes a first input port and a second input port, and the output port of the polarization circuit board includes a first output port and a second output port; when the high-voltage testing device performs the direct current polarization test or the alternating current polarization test on the ultrasonic transducer, the reverse connection prevention circuit includes a diode, a fuse and a switch; one end of the fuse is connected to the high-voltage testing device through the first input port, and the other end of the fuse is connected to the ultrasonic transducer through the first output port; one end of the switch is connected to the fuse and the first output port through the diode, and the other end of the switch is connected to the second input port and the second output port respectively.

[0010] The above polarization test circuit is constructed by a diode, a fuse and a switch, and the switch is closed when the high-voltage test equipment is used to test the ultrasonic transducer in direct current polarization test, and the switch is opened when the high-voltage test equipment is used to test the ultrasonic transducer in alternating current polarization test, so that the circuit can meet the requirements of direct current polarization test and alternating current polarization test at the same time, and the compatibility of the circuit is improved. At the same time, the anti-reverse connection circuit can prevent the input of the high-voltage test equipment from being reversed, so that the polarities of ultrasonic transducers of the same type are the same, and the consistency and reliability of product performance are improved.

[0011] In one implementation, further comprising: a host computer, wherein the host computer is connected to the high-voltage test equipment and the switch respectively; when the high-voltage test equipment is used to test the ultrasonic transducer in direct current polarization test, the host computer controls the switch to be closed; and when the high-voltage test equipment is used to test the ultrasonic transducer in alternating current polarization test, the host computer controls the switch to be opened.

[0012] In one implementation, the input port of the polarization circuit board comprises a first input port and a second input port, and the output port of the polarization circuit board comprises a first output port and a second output port; when the high-voltage test equipment is used to test the ultrasonic transducer in direct current polarization test or alternating current polarization test, the anti-reverse connection circuit comprises a first diode, a second diode, a third diode and a fourth diode; the anode of the first diode is connected to the first input port, and the cathode of the first diode is connected to the first output port; the anode of the second diode is connected to the second input port and the cathode of the third diode respectively, and the cathode of the second diode is connected to the first output port and the cathode of the first diode respectively; the anode of the third diode is connected to the second output port and the anode of the fourth diode respectively, and the cathode of the third diode is connected to the second input port; and the anode of the fourth diode is connected to the second output port, and the cathode of the fourth diode is connected to the anode of the first diode and the first input port respectively.

[0013] In one implementation, the fuse is a self-recovery fuse.

[0014] In one implementation, the input port of the polarization circuit board and the output port of the high-voltage test equipment are both foolproof physical interfaces.

[0015] In one implementation, the anti-reverse connection circuit further comprises a rectifier bridge or a MOS tube.

[0016] In a second aspect, the application further provides a polarization test equipment comprising the polarization test circuit of any of the above implementations.

[0017] Compared with the prior art, the utility model has at least one of the following beneficial effects:

[0018] 1. By setting the reverse connection prevention circuit on the polarization circuit board, the input of the high-voltage test equipment can be prevented from being reversed, so that the polarities of the same type of ultrasonic transducers are the same. The consistency of the polarization direction is ensured, and the consistency and reliability of the product performance are improved.

[0019] 2. When the high-voltage test equipment performs DC polarization test on the ultrasonic transducer, the reverse connection prevention circuit is set as a diode or a combination of a diode and a fuse. The input of the high-voltage test equipment can be prevented from being reversed, so that the polarities of the same type of ultrasonic transducers are the same, and the consistency and reliability of the product performance are improved. At the same time, due to the setting of the diode, the damage to the rear-end circuit caused by the input of the high-voltage test equipment being reversed is effectively prevented.

[0020] 3. By constructing the reverse connection prevention circuit with a diode, a fuse and a switch, the switch is closed when the high-voltage test equipment performs DC polarization test on the ultrasonic transducer. The switch is opened when the high-voltage test equipment performs AC polarization test on the ultrasonic transducer. The circuit can meet the needs of DC polarization test and AC polarization test at the same time, and the compatibility of the circuit is improved. At the same time, the setting of the reverse connection prevention circuit can prevent the input of the high-voltage test equipment from being reversed, so that the polarities of the same type of ultrasonic transducers are the same, and the consistency and reliability of the product performance are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above-mentioned characteristics, technical features, advantages and implementation modes of the present application will be further described in the following preferred embodiments in a clear and easy-to-understand manner in combination with the accompanying drawings.

[0022] Figure 1 A structural block diagram of a polarization test circuit provided by an embodiment of the present application is shown;

[0023] Figure 2 A circuit diagram of a polarization test circuit provided by an embodiment of the present application is shown;

[0024] Figure 3 A circuit diagram of a polarization test circuit provided by an embodiment of the present application is shown;

[0025] Figure 4 A circuit diagram of a polarization test circuit provided by an embodiment of the present application is shown;

[0026] Figure 5 A circuit diagram of a polarization test circuit provided by an embodiment of the present application is shown;

[0027] Figure 6 A circuit diagram of another polarization test circuit provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, specific implementation manners of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0029] In order to make the drawing simple, only the parts related to the present application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the components with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0030] It should be further understood that the term "and / or" used in the specification and claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0031] In this paper, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0033] It should be noted that the above embodiments can be freely combined as needed. The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, some improvements and refinements can also be made, which should be regarded as the protection scope of the present application.

[0034] In the manufacturing process of ultrasonic transducer, the performance of piezoelectric material has a crucial influence on the overall performance of ultrasonic transducer. However, the complexity of the internal structure of piezoelectric material and the unevenness of the polarization electric field distribution may lead to incomplete polarization, and thus affect its performance. Therefore, in order to fully exert the performance of piezoelectric material, it is usually necessary to perform polarization treatment again after the piezoelectric material is divided into array elements.

[0035] Polarization is the process of applying a voltage to the two electrodes of a piezoelectric material to impart polarity. For example, the electrode lead plate of an ultrasonic transducer is connected to a polarization circuit board via a connector. The polarization circuit board connects the positive electrodes of all elements in the piezoelectric material in parallel and connects to one electrode of a high-voltage testing device through its input port. Simultaneously, it connects the negative electrodes of all elements in parallel and connects to the other electrode of the high-voltage testing device through its input port. Then, the high-voltage testing device is activated, and a voltage is applied between the two electrodes to complete the polarization operation. This embodiment of the application, by incorporating a reverse connection protection circuit, prevents reverse connection of the input of the high-voltage testing device during polarization testing of the ultrasonic transducer, ensuring that the polarity of the same element in ultrasonic transducers of the same model is identical, thereby improving the consistency and reliability of product performance.

[0036] The following explanation is based on the accompanying diagram:

[0037] Reference Appendix Figure 1 This illustrates a structural block diagram of a polarization test circuit provided in an embodiment of this application. Figure 1 As shown, it includes: a high-voltage testing device, a reverse connection protection circuit, and an ultrasonic transducer. The high-voltage testing device is connected to the ultrasonic transducer via a polarization circuit board and is used for polarization testing of the ultrasonic transducer; the reverse connection protection circuit is located on the polarization circuit board (see attached diagram). Figure 1 (not shown in the diagram), and the reverse connection protection circuit is connected through the input port of the polarization circuit board (see attached diagram). Figure 1 Input ports 1 and 2 are connected to the high-voltage testing equipment. The reverse connection protection circuit is connected through the output port of the polarization circuit board (see attached diagram). Figure 1 Output ports 1 and 2 are connected to the ultrasonic transducer. When the high-voltage testing equipment performs polarization testing on the ultrasonic transducer, the reverse connection protection circuit is used to prevent the input of the high-voltage testing equipment from being reversed so that ultrasonic transducers of the same model have the same polarity.

[0038] The connection between the ultrasonic transducer and the polarization circuit board is essentially the connection of the electrode lead-out plate (attached) from the ultrasonic transducer. Figure 1 (Not shown) sequentially passes through the output port of the polarization circuit board and the connector on the polarization circuit board (attached). Figure 1The polarization circuit board is connected to the polarization circuit board, and the polarization circuit board can connect the positive poles of all the elements in the piezoelectric material of the ultrasonic transducer in parallel and connect to one of the electrodes of the high-voltage test device through the input port of the polarization circuit board; at the same time, the negative poles of all the elements are connected in parallel and connected to the other electrode of the high-voltage test device through the input port of the polarization circuit board. Since the two electrodes of the high-voltage test device are divided into positive and negative electrodes, the input port of the polarization circuit board is also divided into positive and negative electrodes (for example, the input port 1 is positive, and the input port 2 is negative; or the input port 1 is negative, and the input port 2 is positive).

[0039] In the polarization test of the ultrasonic transducer by the high-voltage test device, the two electrodes of the high-voltage test device are connected to the corresponding input ports on the polarization circuit board, and the polarization test of the ultrasonic transducer is completed by controlling the high-voltage test device. If the two electrodes of the high-voltage test device are reversely connected to the corresponding input ports, the anti-reverse connection circuit can guide the input of the high-voltage test device to ensure that the polarities of the same elements in the ultrasonic transducers of the same type are the same. For example, two ultrasonic transducers of the same type both have an element A, and the anti-reverse connection circuit can ensure that the polarities of the element A in the two ultrasonic transducers of the same type are the same in the polarization test by the high-voltage test device.

[0040] The embodiment of the present application sets the anti-reverse connection circuit on the polarization circuit board, so that the input of the high-voltage test device can be prevented from being reversely connected in the polarization test of the ultrasonic transducer by the high-voltage test device, so that the polarities of the ultrasonic transducers of the same type are the same. The circuit ensures the consistency of the polarization direction, thereby improving the consistency and reliability of the product performance.

[0041] The polarization test includes direct current polarization test and alternating current polarization test. In the direct current polarization test, the connection of the two electrodes of the high-voltage test device to the input ports of the polarization circuit board is fixed (for example, the input port 1 is positive, and the positive electrode of the high-voltage test device is connected to the input port 1; the input port 2 is negative, and the negative electrode of the high-voltage test device is connected to the input port 2; similarly, the input port 1 is negative, and the negative electrode of the high-voltage test device is connected to the input port 1; the input port 2 is positive, and the positive electrode of the high-voltage test device is connected to the input port 2). In the alternating current polarization test, the connection of the two electrodes of the high-voltage test device to the input ports of the polarization circuit board is not fixed (for example, the positive electrode of the high-voltage test device can be connected to the input port 1 or the input port 2, and the negative electrode of the high-voltage test device can also be connected to the input port 1 or the input port 2).

[0042] Taking the direct current polarization test as an example, referring to the accompanying Figure 2 , which shows a circuit diagram of a polarization test circuit provided by an embodiment of the present application. As shown in Figure 2As shown, the reverse connection protection circuit includes a diode. The input ports of the polarization circuit board include a first input port (see attached diagram). Figure 2 Input port 1) and second input port (see attached) Figure 2 Input port 2), the output ports of the polarization circuit board include the first output port (see attached diagram). Figure 2 Output port 1) and second output port (see attached) Figure 2 Output port 2); The anode of the diode is connected to the high-voltage test equipment through the first input port, and the cathode of the diode is connected to the ultrasonic transducer through the first output port; the second input port is connected to the high-voltage test equipment, and the second output port is connected to the ultrasonic transducer.

[0043] A reverse connection protection circuit is constructed using diodes and connected in series between the first input port and the first output port. Utilizing the forward conduction and reverse cutoff characteristics of diodes, reverse connection of the high-voltage testing equipment's input is prevented. When the positive terminal of the high-voltage testing equipment is connected to the first input port (in this embodiment, the first input port is positive) and the negative terminal is connected to the second input port (in this embodiment, the second input port is negative), the circuit operates normally, and the positive and negative terminals of the high-voltage testing equipment are correctly transmitted to the first and second output ports. At this time, when the high-voltage testing equipment performs DC polarization testing on ultrasonic transducers of the same model, the polarity of the same element in the same ultrasonic transducer is the same.

[0044] When the positive terminal of the high-voltage testing equipment is connected to the second input port and the negative terminal is connected to the first input port, the input of the high-voltage testing equipment is reversed. At this time, the diode is cut off, the current cannot form a loop, and the high-voltage testing equipment cannot perform DC polarization testing on the ultrasonic transducer. This ensures that the polarity of the same element in ultrasonic transducers of the same model is the same. Furthermore, the forward conduction and reverse cutoff characteristics of the diode effectively prevent damage to the downstream circuitry caused by the reverse connection of the high-voltage testing equipment's input.

[0045] Taking DC polarization testing as an example, refer to the appendix. Figure 3 The diagram illustrates a polarization test circuit according to an embodiment of this application. Figure 3 As shown, the reverse polarity protection circuit includes a diode and a fuse. The input ports of the polarization circuit board include a first input port (see attached diagram). Figure 3 Input port 1) and second input port (see attached) Figure 3 Input port 2), the output ports of the polarization circuit board include the first output port (see attached diagram). Figure 3 Output port 1) and second output port (see attached) Figure 3The output port 2) is connected with the high-voltage testing device through the first input port at one end of the fuse, and is connected with the ultrasonic transducer through the first output port at the other end of the fuse; the cathode of the diode is connected with the fuse and the first output port respectively, the anode of the diode is connected with the high-voltage testing device through the second input port, and the anode of the diode is also connected with the ultrasonic transducer through the second output port.

[0046] The anti-reverse connection circuit is constructed by the diode and the fuse, and the input reverse connection of the high-voltage testing device is prevented by the cooperation of the diode and the fuse. When the positive pole of the high-voltage testing device is connected with the first input port (the first input port is the positive pole in the embodiment of the application), and the negative pole of the high-voltage testing device is connected with the second input port (the second input port is the negative pole in the embodiment of the application), the circuit operates normally, and the positive and negative poles of the high-voltage testing device are correctly transmitted to the first output port and the second output port. At this time, when the high-voltage testing device performs the direct current polarization test on the ultrasonic transducer of the same type, the polarities of the same array elements in the ultrasonic transducer of the same type are the same.

[0047] When the positive pole of the high-voltage testing device is connected with the second input port, and the negative pole of the high-voltage testing device is connected with the first input port, the input of the high-voltage testing device is reversed. At this time, the diode is turned on, and the current flows through the second input port, the diode, the fuse and the first input port in sequence, and the input is approximately short-circuited, so that the fuse is fused. The positive and negative poles of the high-voltage testing device cannot be correctly transmitted to the first output port and the second output port, that is, the high-voltage testing device cannot perform the direct current polarization test on the ultrasonic transducer, so that the polarities of the same array elements in the ultrasonic transducer of the same type are the same. Moreover, the cooperation of the diode and the fuse can also effectively prevent the damage to the rear-end circuit caused by the input reverse connection of the high-voltage testing device.

[0048] In the embodiment of the application, when the high-voltage testing device performs the direct current polarization test on the ultrasonic transducer, the anti-reverse connection circuit is set as the diode or the combination of the diode and the fuse. The input reverse connection of the high-voltage testing device can be prevented, so that the polarities of the ultrasonic transducers of the same type are the same, and the consistency and reliability of the product performance are improved. At the same time, due to the setting of the diode, the damage to the rear-end circuit caused by the input reverse connection of the high-voltage testing device is effectively prevented.

[0049] Taking that the high-voltage testing device can perform the direct current polarization test or the alternating current polarization test on the ultrasonic transducer as an example, reference is made to the accompanying drawings Figure 4 which shows a circuit diagram of a polarization test circuit provided by the embodiment of the application. As shown in Figure 4As shown, the reverse connection prevention circuit includes a diode, a fuse and a switch. The input ports of the polarization circuit board include a first input port and a second input port, and the output ports of the polarization circuit board include a first output port and a second output port; one end of the fuse is connected to the high-voltage test equipment through the first input port, and the other end of the fuse is connected to the ultrasonic transducer through the first output port; one end of the switch is connected to the fuse and the first output port through the diode, and the other end of the switch is connected to the second input port and the second output port, respectively.

[0050] When the high-voltage test equipment is used to perform direct current polarization test on the ultrasonic transducer, the switch is closed. When the positive pole of the high-voltage test equipment is connected to the first input port and the negative pole of the high-voltage test equipment is connected to the second input port (in the direct current polarization test, the first input port is the positive pole and the second input port is the negative pole in the embodiment of the application), the circuit operates normally, and the positive and negative poles of the high-voltage test equipment are correctly transmitted to the first output port and the second output port. At this time, when the high-voltage test equipment is used to perform direct current polarization test on the ultrasonic transducer of the same type, the polarities of the same element in the ultrasonic transducer of the same type are the same.

[0051] When the positive pole of the high-voltage test equipment is connected to the second input port and the negative pole of the high-voltage test equipment is connected to the first input port, the input of the high-voltage test equipment is reversed (in the direct current polarization test, the first input port is the positive pole and the second input port is the negative pole in the embodiment of the application). At this time, the diode is turned on, and the current flows through the second input port, the diode, the fuse and the first input port in turn, and the input is approximately short-circuited, so the fuse will be blown. The positive and negative poles of the high-voltage test equipment are correctly transmitted to the first output port and the second output port, that is, the high-voltage test equipment cannot perform direct current polarization test on the ultrasonic transducer, so that the polarities of the same element in the ultrasonic transducer of the same type can be ensured to be the same.

[0052] When the high-voltage test equipment is used to perform alternating current polarization test on the ultrasonic transducer, the switch is opened. At this time, the polarities of the first input port and the second input port are not determined, the first input port can be positive or negative, and the second input port can also be positive or negative. The positive and negative poles of the high-voltage test equipment can be connected to the first input port and the second input port, respectively, or can be connected to the second input port and the first input port, respectively, and the circuit can operate normally. The positive and negative poles of the high-voltage test equipment are correctly transmitted to the first output port and the second output port, and when the high-voltage test equipment is used to perform alternating current polarization test on the ultrasonic transducer of the same type, the polarities of the same element in the ultrasonic transducer of the same type are the same.

[0053] The diode, the fuse and the switch are used to construct the reverse connection prevention circuit, the switch is closed when the high-voltage test equipment carries out the direct current polarization test on the ultrasonic transducer, and the switch is opened when the high-voltage test equipment carries out the alternating current polarization test on the ultrasonic transducer, so that the circuit can meet the requirements of the direct current polarization test and the alternating current polarization test at the same time, and the compatibility of the circuit is improved. Meanwhile, the setting of the reverse connection prevention circuit can prevent the input of the high-voltage test equipment from being reversed, so that the polarities of ultrasonic transducers of the same type are the same, and the consistency and reliability of product performance are improved.

[0054] In one embodiment of the present application, reference is made to the accompanying drawings Figure 5 The host computer is further connected with the high-voltage test equipment and the switch. The host computer controls the switch to be closed when the high-voltage test equipment carries out the direct current polarization test on the ultrasonic transducer, and controls the switch to be opened when the high-voltage test equipment carries out the alternating current polarization test on the ultrasonic transducer.

[0055] In the embodiment of the present application, the host computer is added on the basis of the reverse connection prevention circuit constructed by the diode, the fuse and the switch. The host computer controls the switch to be closed and selects the direct current polarization test channel when the high-voltage test equipment carries out the direct current polarization test on the ultrasonic transducer, and controls the switch to be opened and selects the alternating current polarization test channel when the high-voltage test equipment carries out the alternating current polarization test on the ultrasonic transducer. Moreover, the host computer can be controlled to set the warning prompt information. The circuit principle of the embodiment of the present application is the same as that of the foregoing embodiment, and thus will not be described herein.

[0056] Taking that the high-voltage test equipment can carry out the direct current polarization test or the alternating current polarization test on the ultrasonic transducer as an example, reference is made to the accompanying drawings Figure 6 which shows a circuit diagram of a polarization test circuit provided by an embodiment of the present application. As shown in Figure 6 The reverse connection prevention circuit includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4. The anode of the first diode D1 is connected with a first input port, and the cathode of the first diode D1 is connected with a first output port; the anode of the second diode D2 is connected with a second input port and the cathode of the third diode D3 respectively, and the cathode of the second diode D2 is connected with the first output port and the cathode of the first diode D1 respectively; the anode of the third diode D3 is connected with a second output port and the anode of the fourth diode D4 respectively, and the cathode of the third diode D3 is connected with the second input port; the anode of the fourth diode D4 is connected with the second output port, and the cathode of the fourth diode D4 is connected with the anode of the first diode D1 and the first input port respectively.

[0057] In the embodiments of the present application, whether the high-voltage test equipment performs direct current polarization test or alternating current polarization test on the ultrasonic transducer, and whether the input of the high-voltage test equipment is reversed or not, the polarity of the same element in the ultrasonic transducers of the same type can be ensured to be the same.

[0058] For example, when the first input port is positive and the second input port is negative, the positive pole of the high-voltage test equipment is connected to the first input port, and the negative pole of the high-voltage test equipment is connected to the second input port. At this time, the first diode D1 and the third diode D3 are turned on, and the second diode D2 and the fourth diode D4 are turned off. The current flows through the first input port, the first diode D1, the first output port, the ultrasonic transducer, the second output port, the third diode D3, and the second input port in turn.

[0059] When the first input port is negative and the second input port is positive, the positive pole of the high-voltage test equipment is connected to the second input port, and the negative pole of the high-voltage test equipment is connected to the first input port, and the input of the high-voltage test equipment is reversed. At this time, the first diode D1 and the third diode D3 are turned off, and the second diode D2 and the fourth diode D4 are turned on. The current flows through the second input port, the second diode D2, the first output port, the ultrasonic transducer, the second output port, the fourth diode D4, and the first input port in turn. In the two cases, the current can be ensured to flow from the first output port to the ultrasonic transducer and then to the second output port. That is, the polarity of the same element in the ultrasonic transducers of the same type can be ensured to be the same.

[0060] In an embodiment of the present application, the fuse can be a self-recovery fuse.

[0061] In an embodiment of the present application, the input port of the polarization circuit board and the output port of the high-voltage test equipment (i.e., the positive and negative pole ports of the high-voltage test equipment) can be foolproof physical interfaces.

[0062] The setting of the foolproof physical interface can enable an operator to correctly connect the high-voltage test equipment and the polarization circuit board. Moreover, the foolproof physical interface can enable the operation to be repetitive, and different operators and different times can correctly connect the high-voltage test equipment and the polarization circuit board. Of course, the input interface of the polarization circuit board and the output interface of the high-voltage test equipment can also be in the form of a pad plus characters to ensure that the operator can correctly connect the high-voltage test equipment and the polarization circuit board.

[0063] In an embodiment of the present application, the anti-reverse connection circuit can further include a rectifier bridge or a MOS tube.

[0064] The embodiments of the present application also provide a polarization test equipment, which includes the polarization test circuit of any of the above embodiments.

[0065] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered within the scope of the present application.

Claims

1. A polarization test circuit, characterized by, The application relates to a high-voltage test device for ultrasonic transducers, which comprises the following components: a high-voltage test device for polarizing an ultrasonic transducer through a polarization circuit board; a reverse connection prevention circuit arranged on the polarization circuit board and connected to the high-voltage test device through an input port of the polarization circuit board and to the ultrasonic transducer through an output port of the polarization circuit board; when the high-voltage test device is used to polarize the ultrasonic transducer, the reverse connection prevention circuit prevents the input of the high-voltage test device from being reversed so that the polarity of the ultrasonic transducer of the same type is the same.

2. The polarization test circuit of claim 1, wherein, The input port of the polarization circuit board comprises a first input port and a second input port, and the output port of the polarization circuit board comprises a first output port and a second output port; when the high-voltage test device is used to polarize the ultrasonic transducer in a direct current mode, the reverse connection prevention circuit comprises a diode; the anode of the diode is connected to the high-voltage test device through the first input port, and the cathode of the diode is connected to the ultrasonic transducer through the first output port; the second input port is connected to the high-voltage test device, and the second output port is connected to the ultrasonic transducer.

3. The polarization test circuit of claim 1, wherein, The input port of the polarization circuit board comprises a first input port and a second input port, and the output port of the polarization circuit board comprises a first output port and a second output port; when the high-voltage test device is used to polarize the ultrasonic transducer in a direct current mode, the reverse connection prevention circuit comprises a diode and a fuse; one end of the fuse is connected to the high-voltage test device through the first input port, and the other end of the fuse is connected to the ultrasonic transducer through the first output port; the cathode of the diode is connected to the fuse and the first output port respectively, the anode of the diode is connected to the high-voltage test device through the second input port, and the anode of the diode is also connected to the ultrasonic transducer through the second output port.

4. The polarization test circuit of claim 1, wherein, The input port of the polarization circuit board comprises a first input port and a second input port, and the output port of the polarization circuit board comprises a first output port and a second output port; when the high-voltage test device is used to polarize the ultrasonic transducer in a direct current mode or an alternating current mode, the reverse connection prevention circuit comprises a diode, a fuse and a switch; one end of the fuse is connected to the high-voltage test device through the first input port, and the other end of the fuse is connected to the ultrasonic transducer through the first output port; one end of the switch is connected to the fuse and the first output port through the diode, and the other end of the switch is connected to the second input port and the second output port respectively.

5. The polarization test circuit of claim 4, wherein, The application further comprises the following components: a host computer connected to the high-voltage test device and the switch respectively; when the high-voltage test device is used to polarize the ultrasonic transducer in a direct current mode, the host computer controls the switch to be closed; when the high-voltage test device is used to polarize the ultrasonic transducer in an alternating current mode, the host computer controls the switch to be opened.

6. The polarization test circuit of claim 1, wherein, The input port of the polarization circuit board comprises a first input port and a second input port, and the output port of the polarization circuit board comprises a first output port and a second output port; when the high-voltage test equipment performs direct-current polarization test or alternating-current polarization test on the ultrasonic transducer, the reverse connection prevention circuit comprises a first diode, a second diode, a third diode and a fourth diode; The anode of the first diode is connected to the first input port, and the cathode of the first diode is connected to the first output port; The anode of the second diode is connected to the second input port and the cathode of the third diode respectively, and the cathode of the second diode is connected to the first output port and the cathode of the first diode respectively; The anode of the third diode is connected to the second output port and the anode of the fourth diode respectively, and the cathode of the third diode is connected to the second input port; The anode of the fourth diode is connected to the second output port, and the cathode of the fourth diode is connected to the anode of the first diode and the first input port respectively.

7. The polarization test circuit of claim 3, wherein, The fuse is a self-recovery fuse.

8. The polarization test circuit of any one of claims 1-7, wherein, The input port of the polarization circuit board and the output port of the high-voltage test equipment are foolproof physical interfaces.

9. The polarization test circuit of any one of claims 1-7, wherein, The reverse connection prevention circuit further comprises a rectifier bridge or a MOS tube.

10. A polarization test apparatus characterized by comprising: The polarization test circuit comprises the polarization test circuit according to any one of claims 1-9.

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