Multi-beam depth finder transmitting circuit

Abstract

The invention discloses a multi-beam depth sounder transmitting circuit, which comprises an isolating circuit, a driving circuit, an energy storage circuit and a power amplifier circuit, and is characterized in that the isolating circuit is an optical coupler, an external clock CLK and an enable signal EN are isolated to form an isolated enable signal HEN and an isolated clock signal HCLK, and the isolated enable signal HEN and the isolated clock signal HCLK are input into the driving circuit; dead time is set in the driving circuit, and a pair of differential signals is generated to drive the power amplifier circuit; the power amplifier circuit comprises five paths of power tubes, a pulse transformer and a matching circuit, under the drive of differential signals, alternate conduction is achieved in a push-pull mode, variable resistance processing is carried out through the pulse transformer, and finally tuning matching is carried out through the matching circuit, so that the power amplifier circuit is matched with the transducer, and the transducer is made to be close to a pure resistance state. According to the invention, the differential signal dead zone time is controllable, system faults caused by simultaneous conduction of power tubes can be effectively avoided, the problem of poor consistency of a transmitting circuit is solved, and the safety of a multi-beam sounding system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to a transmitting circuit for a multi-beam depth sounder. Background Art

[0002] The multi-beam echo sounder uses a transmitting circuit to drive the transducer array to transmit sound waves with wide sector coverage to the seabed. The narrow beam is received by the receiver and processed using signal processing technology to obtain the water depth values ​​of multiple measured points on the plane perpendicular to the heading, which greatly improves the echo sounding efficiency and is widely used in underwater topography measurement, underwater emergency rescue and other fields.

[0003] The current structure of the multi-beam depth sounder transmitting circuit is as follows Figure 1 As shown in the figure, it is mainly composed of isolation circuit, drive circuit, energy storage circuit and power amplifier circuit. In the process of drive circuit design, the following is usually used Figure 2 The RC resistor-capacitor circuit shown in the figure is designed with dead time or a two-way frequency division chip with built-in delay is used to design the driving circuit, such as UC2706. Due to the influence of factors such as the temperature characteristics of the resistor-capacitor components, the dead time is generally uncontrollable and needs to be measured using an oscilloscope. This not only affects the consistency of the transmitting circuit in the multi-beam echo sounder system, but also easily shortens the dead time due to the aging of the resistor-capacitor components, resulting in the phenomenon that the power tubes are turned on at the same time, thus affecting the safety of the multi-beam echo sounder system.

[0004] The transmitting circuit plays an important role in the multi-beam echo sounding system. The input clock and enable signal are output through the driving circuit to drive the power tube in the power amplifier circuit to alternately conduct, and then use the push-pull method through the pulse transformer to drive the transducer array to transmit sound waves. However, the dead time of the two-way differential signal in the transmitting circuit of the traditional multi-beam echo sounder is usually uncontrollable, and the power tube may be turned on at the same time, causing the echo sounding system to malfunction. Summary of the invention

[0005] The object of the present invention is to provide a multi-beam depth sounder transmitting circuit to solve the problems in the background technology.

[0006] In order to solve the above technical problems, the present invention provides a multi-beam echo sounder transmitting circuit, including an isolation circuit, a driving circuit, an energy storage circuit and a power amplifier circuit.

[0007] The isolation circuit is an optical coupler, which isolates the external clock CLK and the enable signal EN to form an isolated enable signal HEN and an isolated clock signal HCLK and inputs them into the drive circuit;

[0008] A dead time is set in the driving circuit to generate a pair of differential signals to drive the power amplifier circuit;

[0009] The power amplifier circuit includes five power tubes, a pulse transformer and a matching circuit. Under the drive of a differential signal, the five tubes are alternately turned on in a push-pull manner, and the pulse transformers are used to perform resistance changing processing. Finally, the matching circuit is used for tuning and matching to achieve matching between the power amplifier circuit and the transducer, so that the transducer is close to a pure resistance state.

[0010] In one embodiment, the driving circuit includes an inverter, a rising edge D flip-flop, a three-input AND gate, and a gate driving IC connected in sequence;

[0011] The inverter inverts the clock signal with a frequency of fkHz to obtain a frequency of The signal is used as the input of the rising edge D flip-flop;

[0012] The rising edge D flip-flop is used to input a pair of differential signals Q and

[0013] The enable signal HEN, the signal Q, the frequency fkHz signal HCLK and the enable signal HEN, the signal The frequency is fkHz signal HCLK input three input AND gate delay output a pair of differential signals;

[0014] The dead time t of the differential signal is as follows:

[0015]

[0016] Where: D is the duty cycle; f is the clock signal;

[0017] The differential signal is amplified by the gate drive IC, and the output differential signals OUTA and OUTB drive the 5 power tubes respectively to make them conduct alternately.

[0018] In one implementation, each power tube is connected in sequence to a pulse transformer and a matching circuit.

[0019] The multi-beam echo sounder transmitting circuit provided by the present invention has the following beneficial effects:

[0020] 1. The use of domestically produced components greatly reduces hardware costs and is conducive to improving the reliability of the multi-beam system;

[0021] 2. The designed multi-beam echo sounder driving circuit makes the differential signal dead time controllable, which can effectively avoid system failures caused by simultaneous conduction of power tubes, solve the problem of poor consistency of the transmitting circuit, and improve the safety of the multi-beam echo sounder system;

[0022] 3. In the multi-beam echo sounder power amplifier circuit, the push-pull output mode is used to reduce the conduction loss and increase the service life of the echo sounding system; the introduction of a multi-way selection switch to adjust the inductance can tune and match transducers with different operating frequencies, improve the transmission efficiency, and make the transmission circuit have better versatility and can be applied to the full-band echo sounding system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the current multi-beam echo sounder transmitting unit structure.

[0024] Figure 2 It is a schematic diagram of the RC resistor-capacitor circuit structure.

[0025] Figure 3 The present invention provides a schematic diagram of a transmitting circuit of a multi-beam depth sounder.

[0026] Figure 4 It is a schematic diagram of the driving circuit.

[0027] Figure 5 It is a timing diagram of the multi-beam depth sounder drive circuit.

[0028] Figure 6 It is a schematic diagram of the power amplifier circuit of a multi-beam depth sounder. DETAILED DESCRIPTION

[0029] The following is a further detailed description of a multi-beam depth sounder transmitting circuit proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0030] The present invention proposes a multi-beam depth sounder transmitting circuit, such as Figure 3 As shown, EN is the input enable signal; CLK is the input clock signal; HEN is the isolated enable signal; HCLK is the isolated clock signal. The components used in the circuit are all domestic components. The external clock and enable signal are input into the drive circuit after being isolated by optical coupling. In the drive circuit, by setting the dead time, a pair of differential signals are generated to drive the five power tubes, and the push-pull method is used to make them alternately turned on to reduce the conduction loss. The resistance is changed by the pulse transformer respectively, and finally the tuning and matching are performed to achieve the matching of the power amplifier circuit and the transducer, so that the transducer is close to the pure resistance state, thereby improving the transmission efficiency.

[0031] The driving circuit of the present invention is as follows Figure 4 As shown, it includes an inverter, a rising edge D flip-flop, a three-input AND gate and a gate drive IC connected in sequence. Figure 5Table 1 is the timing diagram of the multi-beam depth sounder driving circuit. Table 1 is the model of domestic components of the driving circuit. The circuit design method is as follows:

[0032] 1) Use an inverter to invert the clock signal with a frequency of fkHz to obtain a frequency of The signal is used as the input of the rising edge D flip-flop;

[0033] 2) Use a rising edge D flip-flop to input a pair of differential signals Q and

[0034] 3) Enable signal HEN, signal Q, frequency fkHz signal HCLK and enable signal HEN, signal The frequency is fkHz signal HCLK input three-input AND gate delay output a pair of differential signals; the dead time t of the differential signal is as follows:

[0035]

[0036] Where: D is the duty cycle; f is the clock signal.

[0037] 4) In order to improve the driving capability, the differential signal is amplified by the gate drive IC, and the output differential signals OUTA and OUTB drive the 5 power tubes respectively to make them alternately turned on.

[0038] Component name model Inverter RS1G04XF5 Positive-edge-triggered D flip-flop RS1G74XM Three-input AND gate RS3G11XQ Gate Driver IC SL27524

[0039] Table 1 Models of domestic components in driving circuit

[0040] Figure 6 The power amplifier circuit diagram of the multi-beam depth sounder is shown in Figure 2. The differential signal output by the driving circuit drives the two power tubes respectively, and the power is amplified by the transformer using the push-pull output method, and the transducer is driven by the LC series matching circuit. Since the equivalent resonant capacitance of the transducer is different at different operating frequencies, a multi-way selection switch K is introduced. p By connecting the inductor tap and adjusting the inductance, transducers with different operating frequencies can be tuned and matched, thereby improving the transmission efficiency and the versatility of the transmission circuit.

[0041] The circuit design method for domestic multi-beam echo sounder proposed in this paper uses domestic components, which greatly reduces the hardware cost; the designed driving circuit makes the dead time of the differential signal controllable, which can effectively avoid the phenomenon of simultaneous conduction of the power tubes, and can make the transmitting circuit have better consistency, thereby improving the safety of the multi-beam echo sounder system; the push-pull output method is used to reduce the conduction loss and increase the service life of the echo sounder system; the introduction of a multi-way selection switch in the matching circuit makes the transmitting circuit have better versatility and can be applied to the full-band echo sounder system.

[0042] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A multi-beam echo sounder transmitting circuit, comprising an isolation circuit, a driving circuit, an energy storage circuit and a power amplifier circuit, characterized in that: The isolation circuit is an optical coupler, which isolates the external clock CLK and the enable signal EN to form an isolated enable signal HEN and an isolated clock signal HCLK and inputs them into the drive circuit; A dead time is set in the driving circuit to generate a pair of differential signals to drive the power amplifier circuit; The power amplifier circuit includes five power tubes, a pulse transformer and a matching circuit. Under the drive of a differential signal, the five tubes are alternately turned on in a push-pull manner, and the pulse transformers are used to perform resistance changing processing. Finally, the matching circuit is used for tuning and matching to achieve matching between the power amplifier circuit and the transducer, so that the transducer is close to a pure resistance state.

2. The multi-beam depth sounder transmitting circuit according to claim 1, characterized in that: The driving circuit comprises an inverter, a rising edge D flip-flop, a three-input AND gate and a gate driving IC connected in sequence; The inverter inverts the clock signal with a frequency of fkHz to obtain a frequency of The signal is used as the input of the rising edge D flip-flop; The rising edge D flip-flop is used to input a pair of differential signals Q and The enable signal HEN, the signal Q, the frequency fkHz signal HCLK and the enable signal HEN, the signal The frequency is fkHz signal HCLK input three input AND gate delay output a pair of differential signals; The dead time t of the differential signal is as follows: Where: D is the duty cycle; f is the clock signal; The differential signal is amplified by the gate drive IC, and the output differential signals OUTA and OUTB drive the 5 power tubes respectively to make them conduct alternately.

3. The multi-beam depth sounder transmitting circuit according to claim 1, characterized in that: A pulse transformer and a matching circuit are connected in sequence after each power tube.

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