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A wave loss detection circuit of a drive signal and a switch tube drive circuit

A technology for driving signals and detection circuits, applied in electronic switches, logic circuits using specific components, logic circuits using semiconductor devices, etc., can solve the problems of high sensor prices and high costs, and achieve the effect of reducing costs

Active Publication Date: 2017-06-06
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the price of the sensor is usually relatively high, the cost of this detection method through the sensor is relatively high

Method used

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  • A wave loss detection circuit of a drive signal and a switch tube drive circuit
  • A wave loss detection circuit of a drive signal and a switch tube drive circuit
  • A wave loss detection circuit of a drive signal and a switch tube drive circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] see figure 1 , the embodiment of the present invention provides the first embodiment of the wave loss detection circuit of the drive signal. This embodiment specifically includes: a diode D, a first resistor R1, a first energy storage unit C1, a second resistor R2, and a comparison unit U .

[0065] The anode of the diode D is used to receive the first driving signal. In other words, the anode of the diode is the input terminal of the circuit of this embodiment. Wherein, the first driving signal may be used to drive an electronic device such as a switch tube, and the switch tube refers to a device such as a triode, a MOS tube, and an IGBT for realizing a switch function. The first driving signal may also be a periodic driving signal.

[0066] The cathode of the diode D is connected to the first terminal of the first resistor R1.

[0067] The second terminal of the first resistor R1 is connected to the first terminal of the first energy storage unit C1 , the first te...

Embodiment 2

[0101] see Figure 4 , the embodiment of the present invention also provides a second embodiment of the wave loss detection circuit of the driving signal, and this embodiment includes: a first OR gate OR1, a third resistor R3 and a second energy storage unit C2.

[0102] The two input terminals of the first OR gate OR1 are respectively used to receive the complementary first driving signal and the second driving signal.

[0103] The output end of the first OR gate OR1 is connected to the first end of the third resistor R3; the second end of the third resistor R3 is connected to the first end of the second energy storage unit C2.

[0104] exist Figure 4 In the above, the second energy storage unit C2 is specifically a capacitor as an example. In fact, the second energy storage unit C2 can also be a plurality of series or parallel capacitors, or other energy storage devices. This is not limited.

[0105] The second terminal of the second energy storage unit C2 is connected t...

Embodiment 3

[0126] see Figure 7 , the embodiment of the present invention also provides a third embodiment of the wave loss detection circuit of the drive signal, this embodiment includes: a first OR gate OR1, a second OR gate OR2, a third resistor R3, a fourth resistor R4, a second The energy storage unit C2, the third energy storage unit C3 and the AND gate AND.

[0127] The two input terminals of the first OR gate OR1 are respectively used to receive the complementary first driving signal and the second driving signal.

[0128] The output end of the first OR gate OR1 is connected to the first end of the third resistor R3; the second end of the third resistor R3 is connected to the first end of the second energy storage unit C2.

[0129] exist Figure 7 In the above, the second energy storage unit C2 is specifically a capacitor as an example. In fact, the second energy storage unit C2 can also be a plurality of series or parallel capacitors, or other energy storage devices. This is ...

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Abstract

The embodiment of the present invention provides a wave detection circuit and the switch -driven driving circuit for driving signals.At the first end of the first drive signal, the negative electrode connects the first end of the first resistor; the second end of the first resistance connects the first end of the first energy storage unit, the first end of the second resistance, and the first input end of the comparison unit; The second ends of the first energy storage unit and the second terminal of the second resistance of the second resistance; the resistance value of the first resistance is less than the resistance value of the second resistance;If the voltage signal received at the first input terminal is less than the threshold voltage, the output of the first voltage signal indicates that the first drive signal is lost; the threshold voltage is the high -level critical critical voltage of the first drive signal.It can be seen that the embodiment of this invention has achieved wave loss detection through basic components, and does not require sensors to reduce costs.

Description

technical field [0001] The invention relates to the field of electronic control, in particular to a wave loss detection circuit of a drive signal and a switch tube drive circuit. Background technique [0002] The driving signal is generally transmitted to the control terminal of the electronic device through the transmission line, and is used to drive the electronic device to work. [0003] However, due to transmission line failure and other reasons, the driving signal will lose wave phenomenon, and the electronic device cannot be driven normally, resulting in potential safety hazards. For example, when two driving signals are used to drive parallel IGBTs, if one of the driving signals loses wave phenomenon, the IGBT driven by the other driving signal will bear a larger current, which is likely to cause device overstress failure . [0004] In order to solve this potential safety hazard, in the prior art, a sensor is used to detect the output signal of the electronic device...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/74H03K19/08H02M1/088G01R31/50
CPCH03K17/08122H03K17/122H03K17/162H03K17/18H03K7/08G01R31/54G01R31/52G01R31/50H03B28/00H03K4/085H03K17/567G01R31/44
Inventor 曹震刘云峰张彦忠
Owner HUAWEI DIGITAL POWER TECH CO LTD