1、重慶升降平臺/采用三角波發(fā)生電路來產(chǎn)生載波，載波頻率需同時考慮鋁合金升降機系統(tǒng)響應(yīng)性能和高速開關(guān)閥的壽命兩個因素，工程應(yīng)用中，頻率一般在幾個Hz到幾十個Hz之間，然后載波與輸入控制信號進行比較，得到PWM脈寬信號。
Hangzhou lifting platform triangular wave generating circuit to generate the carrier, the carrier frequency must be taking aluminum lift system response lifetime performance and high-speed switching valves on two factors, engineering applications, the frequency is generally between a few Hz to tens of Hz, then the carrier is compared with the input control signal to obtain a PWM pulse width signal.

2、當升降平臺PWM為高電平時，光耦芯片的輸入端為正，光耦導(dǎo)通工作，則引腳4輸出正電壓，使驅(qū)動芯片的引腳2輸出控制信號，驅(qū)動場效應(yīng)管工作，實現(xiàn)高空作業(yè)平臺高速開關(guān)閥的功率放大及驅(qū)動。當PWM脈沖為低電平時，光耦截止，沒有輸出信號，高速開關(guān)閥不工作。
When lifting platform Hangzhou PWM is high, the input of optocoupler chip is positive, the optocoupler conducting work, the pin 4 positive output voltage, the output pin 2 driver chip control signal, driving FET work aerial work platforms to achieve high-speed switching valve power amplifier and driver. When the PWM pulse is low, the optocoupler is off, there is no output signal, high-speed switching valve does not work.

3、電路中，由于采用了場效應(yīng)管來驅(qū)動高速開關(guān)閥，使得發(fā)熱量大大減小，降低了系統(tǒng)的功率損耗，并使工作更加穩(wěn)定可靠。同時，經(jīng)過升降平臺電阻阻值等特殊匹配，使輸出產(chǎn)生一個瞬間的高電壓脈沖，能夠迅速及時地打開高速開關(guān)閥。這對于提高升降平臺高速開關(guān)閥的快速響應(yīng)速度、克服躍過死區(qū)具有重要的作用。
Hangzhou lifting platform circuit, thanks to the FET to drive high-speed switching valve such that the heat is greatly reduced, reducing the power loss system, and make it more stable and reliable. At the same time, through a special matching resistor Hangzhou lifting platform, so that the output generates an instantaneous high voltage pulse that can quickly turn on the high-speed switching valve in a timely manner. This fast response speed for improving Hangzhou high-speed switching valve lifting platform, to overcome jumps over the dead zone has an important role.