Low-power-consumption modulation method suitable for simultaneously transmitting signals and energy

Abstract

The invention belongs to the technical field of pulse transformers, and particularly relates to a low-power-consumption modulation method suitable for simultaneously transmitting signals and energy, which comprises a clock part, a signal sampling part and a modulation part. The clock part comprises an adjustable duty ratio low-frequency oscillator and a controlled high-frequency oscillator, the signal sampling part comprises a trigger, and the modulation part comprises a frequency division and phase separation logic circuit, a combinational logic circuit and an AND gate; compared with the prior art, the low-power-consumption switch driving circuit can transmit energy and also can transmit signals, and the magnitude of the transmitted energy can be controlled, so that the isolation effect is greatly enhanced while low-power-consumption switch driving is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of pulse transformers, and more particularly to a low-power modulation method suitable for transmitting signals and energy simultaneously. Background Art

[0002] The driving methods of the isolation switch mainly include photocouplers and pulse drive transformers. Existing photocoupler switches generally have slow switching speeds and large transmission delays, so they can only be used in low-frequency switching applications. In addition, photocouplers require independent power supplies, which undoubtedly increases the complexity and power consumption of the system.

[0003] Pulse transformer switches can not only achieve signal isolation, but also transfer energy at a fast transmission speed: Compared with optocouplers, pulse transformers have shorter transmission delays and better stability. The inductive devices have no aging effects, and the transmission delays and errors will not change during the life cycle. However, existing pulse transformer switches mainly transmit signals and do not transmit energy, which affects the isolation effect. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a modulation method suitable for a pulse transformer switch, which can transmit both energy and signals, and the amount of transmitted energy can be controlled, thereby achieving low-power switch driving while greatly enhancing the isolation effect.

[0005] To achieve the above object, the present invention provides the following technical solutions: A low-power modulation method suitable for transmitting signals and energy at the same time, comprising a clock part, a signal sampling part and a modulation part. The clock part comprises an adjustable duty cycle low-frequency oscillator and a controlled high-frequency oscillator, the signal sampling part comprises a trigger, and the modulation part comprises a frequency division and phase separation logic circuit, a combinational logic circuit and an AND gate; The square wave one generated by the low-frequency oscillator with adjustable duty cycle is used for signal sampling and for controlling the high-frequency OSC oscillation. The controlled high-frequency oscillator generates a high-frequency signal and forms a square wave two. The trigger completes the signal sampling of the square wave one generated by the low-frequency oscillator with adjustable duty cycle. The frequency division and phase separation logic circuit is used to divide the frequency and phase separate the high-frequency signal to obtain square waves three and four. Square wave three and the sampled square wave one are output through the AND gate and combined with square wave four to form square wave five through the combination logic circuit. Square wave two and square wave five are combined with square wave five to form square wave six through the combination logic circuit.

[0006] Furthermore, the controlled high-frequency oscillator is used to generate a high-frequency signal for modulating the EN signal, the oscillation time is controlled by square wave 1, and the frequency is 85-95 MHz.

[0007] Furthermore, the information sampling of the trigger is completed by the rising edge of square wave one.

[0008] Further, the high frequency signal generated by the controlled high frequency OSC is divided 256 times, and square wave three and square wave four are generated through the logical combination of different divided frequency signals.

[0009] Furthermore, square wave three carries EN information.

[0010] By sampling the above technical solution, the beneficial effects of the present invention are: 1. The modulation method of the present invention can transmit energy and signals at the same time, simplifying the external circuit. The external circuit only needs to provide a signal source, and the voltage application range can be very wide, and can widely use an input signal source of 3~60V.

[0011] 2. The method of the present invention makes the duty cycle of energy transmission adjustable, and the amount of energy transferred can be selected according to the application, thereby greatly reducing the power consumption of the driving application, and the average power consumption is at the uA level.

[0012] 3. Through narrow pulse modulation, the receiving end does not need power supply, which greatly enhances the isolation effect and achieves 3KvRMS isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the circuit structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] A low-power modulation method suitable for transmitting signals and energy at the same time includes a clock part, a signal sampling part and a modulation part. The clock part includes an adjustable duty cycle low-frequency oscillator and a controlled high-frequency oscillator, the signal sampling part includes a trigger, and the modulation part includes a frequency division and phase separation logic circuit, a combinational logic circuit and an AND gate.

[0017] The square wave generated by the low-frequency OSC with adjustable duty cycle is used for both signal sampling and controlling the high-frequency OSC oscillation. After obtaining the high-frequency signal, the high-frequency signal is divided and phase separated to generate the required square wave. After being ANDed with the sampling signal, it is modulated with the high-frequency signal to obtain the modulated signal, which can also transmit energy.

[0018] The adjustable duty cycle low-frequency OSC is a low-frequency OSC that mainly generates the total cycle of energy transmission. Its duty cycle is adjustable to ensure adjustable energy transfer. At the same time, it controls the switch of the high-frequency OSC to save energy in the gap when no energy is transferred, and realizes low power consumption functions, such as Figure 1 As shown, the generated square wave 1 samples the EN signal during the rising edge phase and also controls the high-frequency OSC.

[0019] The controlled high-frequency OSC mainly generates a high-frequency signal for modulating the EN signal. The oscillation time is controlled by square wave 1, and the typical frequency is about 89MHz.

[0020] In the signal sampling part, the rising edge of the square wave 1 model generated by the adjustable duty cycle low-frequency OSC is used to complete the sampling, thus ensuring that each energy transfer cycle can be completed completely.

[0021] In the modulation part, the high-frequency signal generated by the controlled high-frequency OSC is divided 256 times, and then the generation of square wave 3 and square wave 4 is completed through the logical combination of different divided signals. Square wave 3 and square wave 4 will be combined together through combinational logic, but square wave 3 will also perform AND logic with the signal sampled by EN, so that square wave 3 carries EN information.

[0022] In the modulation part, the output of gate L1 is combined with square wave 4 to generate square wave 5 through combinational logic, completing the sampling of EN information. EN=1 is a complete cycle, while when EN=0, the high level part is divided into a narrow pulse and a wide pulse.

[0023] In the modulation part, square wave 5 and square wave 2 are combined with logic to combine the waveform of the controlled high-frequency OSC and the square wave with EN information to generate a modulated square wave 6.

[0024] As shown in the figure, T0~T1 is a cycle, T1~T4 is also a cycle, and the time is completely equal, among which T1~T2 and T2~T3 are both 36TCK widths, TCK is the cycle of the high-frequency OSC, and T2~T3 is the key to demodulating EN=1 or EN=0; during demodulation, demodulation can be performed by counting the total time exceeding T1~T3 through the counter. In this way, whether EN=1 or EN=0, the high-frequency carrier in the T3~T4 time period can be responsible for not modulating the signal, but for transmitting energy. In this way, the difference in transmission energy between EN=1 and EN=0 is only in the very short time period of T2~T3.

[0025] From the above description, it can be seen that this modulation method uses a very narrow low pulse to complete the modulation of the EN signal, and whether EN is 1 or 0, it has no effect on the transferred energy, and the amount of transferred energy depends entirely on the high level width of the adjustable duty cycle low-frequency OSC.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-power modulation method suitable for transmitting signals and energy simultaneously, characterized in that: include The clock section includes an adjustable duty cycle low frequency oscillator and a controlled high frequency oscillator. The signal sampling part, including trigger, Modulation part, including frequency division and phase separation logic circuit, combinational logic circuit and AND gate; The square wave generated by the low frequency oscillator with adjustable duty cycle is used for both signal sampling and controlling the high frequency OSC oscillation. The controlled high frequency oscillator generates a high frequency signal and forms a square wave 2, The trigger completes the signal sampling of the square wave generated by the adjustable duty cycle low frequency oscillator. The frequency division and phase separation logic circuit is used to divide the frequency and phase separate the high frequency signal to obtain square wave three and square wave four. Square wave 3 and square wave 1 after sampling are output through the AND gate and combined with square wave 4 through the combination logic circuit to form square wave 5. Square wave two and square wave five are combined into square wave six through a combinational logic circuit.

2. A low-power modulation method suitable for transmitting signals and energy simultaneously according to claim 1, characterized in that: The controlled high-frequency oscillator is used to generate a high-frequency signal for modulating the EN signal, the oscillation time is controlled by square wave 1, and the frequency is 85-95 MHz.

3. A low-power modulation method suitable for transmitting signals and energy simultaneously according to claim 1, characterized in that: The information sampling of the trigger is completed by the rising edge of square wave one.

4. A low-power modulation method suitable for transmitting signals and energy simultaneously according to claim 1, characterized in that: The high-frequency signal generated by the controlled high-frequency OSC is divided 256 times, and square wave three and square wave four are generated through the logical combination of different divided frequency signals.

5. A low-power modulation method suitable for transmitting signals and energy simultaneously according to claim 4, characterized in that: The square wave three carries EN information.

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