能量泄放电路及电源设备

Abstract

本申请实施例公开一种能量泄放电路及电源设备，能量泄放电路包括电源检测电路、放电控制电路及放电电路，电源检测电路采样系统电源，得到采样电压。放电控制电路响应采样电压小于或等于预设电压阈值，输出第一控制信号，响应采样电压大于预设电压阈值，输出第二控制信号。放电电路在接收到第一控制信号时，泄放母线电容存储的能量，在接收到第二控制信号，停止泄放母线电容存储的能量。本申请实施例采用被动泄放方式对母线电容的能量进行泄放，无需做软件逻辑分析，仅依赖电源检测电路、放电控制电路及放电电路的硬件架构，采用硬件方式泄放母线电容的能量，硬件方式的泄放速率比软件方式的泄放速率快，有利于提高母线电容的能量的泄放效率。

Claims

1. An energy discharge circuit, characterized by, include: The power supply detection circuit is configured as the power supply for the sampling system to obtain the sampled voltage. A discharge control circuit, electrically connected to the power detection circuit, is configured to output a first control signal in response to the sampling voltage being less than or equal to a preset voltage threshold, or to output a second control signal in response to the sampling voltage being greater than the preset voltage threshold, wherein the level type of the first control signal is different from the level type of the second control signal. The discharge circuit, electrically connected to the discharge control circuit and also electrically connected to an external bus capacitor, is configured to operate based on the electrical energy of the bus capacitor when the first control signal is received, to discharge the energy stored in the bus capacitor, or to stop discharging the energy stored in the bus capacitor when the second control signal is received.

2. The energy discharge circuit of claim 1, wherein, The discharge control circuit includes: An enabling circuit, electrically connected to the power detection circuit, is configured to output a first driving signal in response to the sampled voltage being less than or equal to a preset voltage threshold, or to output a second driving signal in response to the sampled voltage being greater than the preset voltage threshold, wherein the level type of the first driving signal is different from the level type of the second driving signal. The driving circuit, which is electrically connected to the enabling circuit and the discharging circuit respectively, is configured to output a first control signal in response to the first driving signal, or to output a second control signal in response to the second driving signal.

3. The energy discharge circuit of claim 2, wherein, The enabling circuit includes: A voltage conversion circuit, electrically connected to the power detection circuit, is configured to output a first conversion signal in response to the sampled voltage being less than or equal to a preset voltage threshold, or to output a second conversion signal in response to the sampled voltage being greater than the preset voltage threshold. The first switching circuit is electrically connected to the voltage conversion circuit and the driving circuit respectively, and is configured to enter the cut-off state to output the first driving signal in response to the first conversion signal, or to enter the on state to output the second driving signal in response to the second conversion signal.

4. The energy discharge circuit of claim 3, wherein, The voltage conversion circuit includes: The first voltage regulator circuit is electrically connected to the power detection circuit and is configured to output a first conversion signal in response to the sampled voltage being less than or equal to a preset voltage threshold, or to output a second conversion signal in response to the sampled voltage being greater than the preset voltage threshold. The first filtering circuit, electrically connected between the first voltage regulator circuit and the power supply detection circuit, is configured to filter the sampled voltage.

5. The energy discharge circuit of claim 3, wherein, The first switching circuit includes a first switching transistor, which is electrically connected to the voltage conversion circuit and the driving circuit respectively. It is configured to enter a cutoff state to output a first driving signal in response to the first conversion signal, or to enter a conduction state to output a second driving signal in response to the second conversion signal.

6. The energy discharge circuit of claim 2, wherein, The driving circuit includes: An impedance matching circuit is electrically connected to the enabling circuit and the bus capacitor, respectively. The second voltage regulator circuit is electrically connected to the impedance matching circuit and the discharge circuit, respectively, and is configured to output a first control signal in response to the first drive signal and clamp the voltage of the first control signal within a safe voltage range, or to output a second control signal in response to the second drive signal.

7. The energy discharge circuit according to any one of claims 2 to 6, characterized by, The discharge circuit includes: A current limiting circuit is used to electrically connect to the first terminal of the bus capacitor, and the second terminal of the bus capacitor is grounded; The second switching circuit, which is electrically connected to the current limiting circuit and the driving circuit respectively, is configured to release the energy stored in the bus capacitor through the current limiting circuit in response to the first control signal, or to stop releasing the energy stored in the bus capacitor in response to the second control signal.

8. The energy discharge circuit of claim 7, wherein, The second switching circuit includes a second switching transistor, which is electrically connected to the current limiting circuit and the driving circuit respectively. It is configured to respond to the first control signal, enter a conducting state to allow the energy stored in the bus capacitor to be discharged through the current limiting circuit and the second switching transistor, or to respond to the second control signal to stop discharging the energy stored in the bus capacitor.

9. The energy discharge circuit according to any one of claims 1 to 6, characterized in that, The power detection circuit includes: A power supply winding is used to couple the primary winding of the system power supply to obtain the power supply voltage; A rectifier circuit, electrically connected to the power supply winding, is configured to rectify the power supply voltage to obtain a shaped current; A current sampling circuit, electrically connected between the rectifier circuit and the discharge control circuit, is configured to sample the rectified current to obtain a sampled voltage.

10. A power supply device characterized by comprising: Includes the energy discharge circuit as described in any one of claims 1-9.

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