Intermittent charging circuit of high-voltage capacitor

Abstract

The utility model discloses an intermittent charging circuit of a high-voltage capacitor. The intermittent charging circuit comprises a first filter rectifier module, a first switch module, a power management module, a transformer, a switch tube Q2 and an output module, the first output end of the first filtering and rectifying module, the first switch module and the power management module are electrically connected with the grid electrode of the switch tube Q2 in sequence, the first end of a primary coil of the transformer is electrically connected with the second output end of the first filtering and rectifying module, and the second end of the primary coil of the transformer is electrically connected with the drain electrode of the switch tube Q2. The output end of the transformer is electrically connected with the output module, and the source electrode of the switch tube Q2 is grounded; the first switch module is used for controlling on and off of power supply of the power management module; the power management module is used for converting the direct current output by the second output end of the first filtering and rectifying module into alternating voltage; the power supply control module is switched on and switched off through the first switch module, so that the power supply control module is converted between a normal working state and a working stopping state in unit time, intermittent high-voltage output is further realized, the output time is short, the impact on the high-voltage capacitor is relatively small, and the high-voltage capacitor is not damaged. Therefore, the intermittent and low-impact-current charging requirements are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-voltage capacitor charging, in particular to an intermittent charging circuit for a high-voltage capacitor. Background Art

[0002] High-voltage capacitors are specifically designed to withstand high voltages. They are used to store and release electrical energy in high-voltage environments and feature high dielectric strength and high-voltage resistance. High-voltage capacitors are widely used in power electronics, pulse circuits, radio frequency, and microwave circuits.

[0003] Most traditional high-voltage capacitor intermittent charging circuits use an AC-DC step-down and then DC-DC step-up solution, such as the "A high-voltage pulse capacitor charging device" disclosed in the patent document "CN110190659B". Its technical solution battery and charging module includes parallel battery modules and bidirectional DC / DC modules. The voltage across the battery and charging units in n battery and charging modules is applied to the pulse capacitor through a connecting switch. When the connecting switch is disconnected, the cascaded bidirectional DC / DC controls the rectifier power supply to charge the battery module. When the connecting switch is closed, the cascaded bidirectional DC / DC controls the battery module to charge the pulse capacitor.

[0004] In this patent, the use of a large number of components leads to high costs, and the operating frequency of the DC-DC circuit part in this type of circuit is often high, generally above 100KHz, which makes the product's EMC poor. Designers need to spend a lot of time and energy to make corrections. In addition, the output of this type of circuit is continuous. When charging the high-voltage capacitor, the inrush current lasts for a long time, which has a great impact on the high-voltage capacitor. Utility Model Content

[0005] The purpose of the present utility model is to provide an intermittent charging circuit for a high-voltage capacitor to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An intermittent charging circuit for a high-voltage capacitor includes a first filtering and rectifying module, a first switching module, a power management module, a transformer, a switching tube Q2, and an output module;

[0008] The first output end of the first filtering and rectifying module, the first switching module, and the power management module are electrically connected to the gate of the switching tube Q2 in sequence. The first end of the primary coil of the transformer is electrically connected to the second output end of the first filtering and rectifying module. The second end of the primary coil of the transformer is electrically connected to the drain of the switching tube Q2. The output end of the transformer is electrically connected to the output module. The source of the switching tube Q2 is grounded.

[0009] The first filtering and rectifying module is used to rectify and filter the external AC power into DC power;

[0010] The first switch module is used to control the power supply of the power management module to be turned on and off;

[0011] The power management module outputs a PWM signal to the gate of the switch tube Q2 to control the on and off of the switch tube Q2;

[0012] The PWM signal drives the switch tube Q2 to be turned on and off, so as to convert the direct current outputted from the second output terminal of the first filtering and rectifying module into an alternating voltage.

[0013] According to a further technical solution, the first switch module includes a resistance unit, a switch unit and an enabling unit;

[0014] The first output end of the first filtering and rectifying module is connected in series with the resistance unit and the switch unit, and the other end of the switch unit is electrically connected to one end of the power management module;

[0015] The enabling unit is used to control the switch unit to be turned on and off.

[0016] According to a further technical solution, the switch unit includes a capacitor C1, a resistor R1, a sensing transistor PC1, a voltage-stabilizing diode D2, a voltage-stabilizing diode D3 and a transistor Q1;

[0017] One end of the capacitor C1 is electrically connected to the resistance unit, and the other end of the capacitor C1 is grounded. The voltage-stabilizing diode D3 is connected in parallel with the capacitor C1, and the cathode of the voltage-stabilizing diode D3 is electrically connected to the resistance unit, and the anode of the voltage-stabilizing diode D3 is grounded. One end of the resistor R1 is electrically connected to the collector of the sensing transistor PC1, and the other end of the resistor R1 forms a first node with the resistance unit and the collector of the transistor Q1. The emitter of the sensing transistor PC1, the cathode of the voltage-stabilizing diode D2, and the base of the transistor Q1 are electrically connected. The anode of the voltage-stabilizing diode D2 is grounded, and the emitter of the transistor Q1 is electrically connected to the power management module.

[0018] The enabling unit is used to control the on and off of the sensing transistor PC1.

[0019] According to a further technical solution, the enabling unit includes a resistor R25 and a light emitting diode PC2, one end of the resistor R25 is electrically connected to the enabling end, the other end of the resistor R25 is electrically connected to the anode of the diode PC2, and the cathode of the diode PC2 is grounded.

[0020] According to a further technical solution, the power management module includes a power management chip U1 and a capacitor C6, the emitter of the transistor Q1, the VDD pin of the power management chip U1, and the capacitor C6 form a second node, and the other end of the capacitor C6 is grounded;

[0021] The GATE pin of the power management chip U1 is electrically connected to the gate of the switch tube Q2.

[0022] According to a further technical solution, the gate of the switch tube Q2 is electrically connected to a resistor R20 , and the other end of the resistor R20 is electrically connected to the source of the switch tube Q2 .

[0023] A further technical solution is that the CS pin of the power management chip UI is electrically connected to a resistor R11, the resistor 11 is electrically connected to a resistor R23, one end of the resistor R23 forms a node with one end of the resistor 11 and the resistor 20, the other end of the resistor R23 is grounded, the resistor R23 is electrically connected to a resistor R24, and the resistor R23 is connected in parallel with the resistor R24.

[0024] According to a further technical solution, the output module includes a rectifier unit, a protection unit and a filter unit;

[0025] The rectifier unit is electrically connected to the output end of the transformer, and the rectifier unit is connected in series with the filter unit;

[0026] The rectifier unit is used to rectify the AC signal output from the output end of the transformer into DC power;

[0027] The protection unit is used to absorb reverse voltage; the filtering unit is used to filter clutter.

[0028] According to a further technical solution, the rectifier unit includes a diode D6, an anode of the diode D6 is electrically connected to the output end of the transformer, and a cathode of the diode D6 is electrically connected to the filter unit.

[0029] According to a further technical solution, the protection unit includes a capacitor C11 and a resistor R26, the capacitor C11 is electrically connected to the resistor R26, the other end of the capacitor C11 is electrically connected to the anode of the diode D6, and the other end of the resistor R26 is electrically connected to the filter unit.

[0030] Beneficial effects of the utility model:

[0031] The utility model includes a first filter and rectifier module, a first switch module, a power management module, a transformer, a switch tube Q2 and an output module; the first output end of the first filter and rectifier module, the first switch module, and the power management module are electrically connected to the gate of the switch tube Q2 in sequence; the first filter and rectifier module can rectify external AC power into DC power output; the first switch module can control the opening and closing of the power supply of the power management module, that is, the first switch module can control the working state of the power management module; when the power management module is working, it outputs a PWM signal to the gate of the switch tube Q2, which can control the conduction and closing of the switch tube Q2; the first input end of the transformer is electrically connected to the second output end of the first filter and rectifier module, the second input end of the transformer is electrically connected to the drain of the switch tube Q2, and can drive the conduction and closing of the switch tube Q2 by the PWM signal to convert the DC power output from the second output end of the first filter and rectifier module into an AC voltage; the AC voltage is transmitted to the output signal through the energy of the transformer and output to the high-voltage capacitor;

[0032] The utility model turns on and off the power management module through the first switch module, so that the power management module switches between normal working and stopped working states per unit time, thereby realizing intermittent high voltage output. Since the output time is short, the impact on the high-voltage capacitor is relatively small, thereby meeting the intermittent charging requirements with small impact current.

[0033] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 : Circuit diagram of the first filtering and rectifying module of the present utility model.

[0035] Figure 2 : Circuit diagram of the enabling unit of the present utility model.

[0036] Figure 3 : Output module circuit diagram of the utility model.

[0037] Figure 4 : Circuit diagram of the present utility model. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0039] Please refer to Figure 1-4 ;

[0040] An intermittent charging circuit for a high-voltage capacitor includes a first filtering and rectifying module, a first switching module, a power management module, a transformer, a switching tube Q2, and an output module;

[0041] The first output terminal of the first filter and rectifier module, the first switch module, the power management module, and the gate of the switch tube Q2 are electrically connected in sequence; the second output terminal of the first filter and rectifier module is electrically connected to the first input terminal of the transformer, and the second input terminal of the transformer is electrically connected to the drain of the switch tube Q2; the source of the switch tube Q2 is grounded; and the output terminal of the transformer is electrically connected to the output module;

[0042] In this embodiment, the first filtering and rectifying module is externally connected to an AC power source, and is used to rectify and filter the external AC power and convert it into DC power. The branch of the DC power passes through the first switching module to supply power to the power management module, and the first switching module can be used to control the on and off of the power supply of the power management module. When the power management module is powered and operates normally, the power management module can output a PWM signal to the gate of the switch tube Q2. The PWM signal can send a high-level signal or a low-level signal, thereby controlling the conduction and off of the switch tube Q2, thereby converting the DC power output from the second output end of the first filtering and rectifying module into an AC voltage.

[0043] The alternating voltage is output to the output module through the energy transfer of the transformer, thereby charging the high-voltage capacitor.

[0044] Specifically, the external power supply outputs an AC voltage to the first filtering and rectifying module. The first filtering and rectifying module rectifies the AC voltage signal output by the external power supply into a DC voltage signal, performs filtering processing, and then outputs the signal to the first switching module. After receiving the voltage signal from the first filtering and rectifying module, if the first switching module is in an open state, the first switching module can output a DC voltage signal to the power management module to supply power to the power management module, so that the power management module can output a PWM signal to the gate of the transistor Q2 after receiving the voltage signal and processing it, thereby turning on the transistor Q2. The second output end of the first filtering and rectifying module can output the voltage signal to the drain of the switch tube Q2 through the transformer. Since the source of the switch tube Q2 is grounded, the switch tube Q2 is turned on.

[0045] In this embodiment, when the power management module is working normally, the power management module can output a PWM signal to the gate of the transistor Q2. When the PWM signal is a low-level signal, Q2 is turned off and the transformer T1 stores energy. When the PWM signal is a high-level signal, Q2 is turned on and the transformer T1 releases energy. At this time, the output module can receive the voltage signal. Within a unit time, the operator can control the conduction and closing of the first switch module to control the power management module to send a driving PWM signal, thereby achieving intermittent high voltage output. Since the output time is short, the impact on the high-voltage capacitor is relatively small, thereby meeting the intermittent charging requirements with small impact current.

[0046] In this embodiment, the first switch module includes a resistance unit, a switch unit and an enabling unit; the first output end of the first filter and rectifier module is connected in series with the resistance unit and the switch unit, the other end of the switch unit is electrically connected to one end of the power management module, and the enabling unit is used to control the switch unit to be turned on and off. More specifically, the switch unit includes a capacitor C1, a resistor R1, an inductive transistor PC1, a Zener diode D2, a Zener diode D3 and a transistor Q1, the resistance unit includes a resistor R9 and a resistor R10, and the resistor R9 is connected in series with the resistor R10; one end of the capacitor C1 is electrically connected to the resistor R9, and the other end of the capacitor C1 is grounded, the Zener diode D3 is connected in parallel with the capacitor C1, and the Zener diode The cathode of D3 is electrically connected to the resistor R9, the anode of the Zener diode D3 is grounded, one end of the resistor R1 is electrically connected to the collector of the sensing transistor PC1, the other end of the resistor R1 forms a first node with the resistor R9 and the collector of the transistor Q1, the emitter of the sensing transistor PC1, the cathode of the Zener diode D2 and the base of the transistor Q1 are electrically connected, the anode of the Zener diode D2 is grounded, and the emitter of the transistor Q1 is electrically connected to the power management module; the enabling unit includes a resistor R25 and a light-emitting diode PC2, one end of the resistor R25 is electrically connected to the enable end, the other end of the resistor R25 is electrically connected to the anode of the light-emitting diode PC2, and the cathode of the light-emitting diode PC2 is grounded.

[0047] Specifically, the operator controls the enable terminal to turn the power on and off per unit time, thereby turning on and off the light source of the light-emitting diode PC2 per unit time, thereby turning on and off the sensing transistor PC1 per unit time, thereby turning on and off the transistor Q1 per unit time, and thus the power management module receives and stops power supply per unit time. When the power management module receives power, the power management module can output a PWM signal to the gate of the switch tube Q2. The PWM signal can send a high-level signal or a low-level signal, thereby controlling the conduction and shutdown of the switch tube Q2, thereby converting the direct current output from the second output terminal of the first filter and rectifier module into an alternating voltage. The alternating voltage is output to the output module through energy transfer of the transformer, thereby charging the high-voltage capacitor. Correspondingly, when the power management module stops supplying power, the power management module cannot output a PWM signal to the gate of the switch tube Q2, causing the switch tube Q2 to remain in the off state. That is, the direct current output from the second output terminal of the first filter and rectifier module cannot be converted into an alternating voltage, causing the output module to be unable to output a high voltage, thereby making it difficult to charge the high-voltage capacitor. In this way, intermittent charging of the high-voltage capacitor is achieved by switching the light-emitting diode PC1 on and off.

[0048] In this embodiment, the power management module includes a power management chip U1 and a capacitor C6. The emitter of the transistor Q1 forms a second node with the VDD pin of the power management chip U1 and the capacitor C6. The other end of the capacitor C6 is grounded. The GATE pin of the power management chip U1 is electrically connected to the gate of the switch tube Q2. When the power management chip U1 is powered, the GATE pin of the power management chip U1 will output a PWM signal to the gate of Q2. Since the PWM signal is a continuously switching high-level signal and a low-level signal, the switch tube Q2 is continuously turned on and off, thereby causing the first filter rectifier to The direct current output from the second output end of the module is converted into an alternating voltage signal and transmitted to the transformer, and then output to the high-voltage capacitor to charge the high-voltage capacitor; further, the gate of the switch tube Q2 is electrically connected to the resistor R20, and the other end of the resistor R20 is electrically connected to the source of the switch tube Q2; the CS pin of the power management chip UI is electrically connected to the resistor R11, and the resistor 11 is electrically connected to the resistor R23, one end of the resistor R23 forms a node with one end of the resistor 11 and the resistor 20, and the other end of the resistor R23 is grounded, and the resistor R23 is electrically connected to the resistor R24, and the resistor R23 and the resistor R24 ​​are connected in parallel.

[0049] In this embodiment, the output module includes a rectifier unit, a protection unit and a filter unit; the rectifier unit is electrically connected to the output end of the transformer, and the rectifier unit and the filter unit are connected in series; the rectifier unit is used to rectify the AC signal output from the output end of the transformer into DC power; the protection unit is used to absorb reverse voltage; the filter unit is used to filter out clutter; more specifically, the rectifier unit includes a diode D6, the anode of the diode D6 is electrically connected to the output end of the transformer, and the cathode of the diode D6 is electrically connected to the filter unit; the protection unit includes a capacitor C11 and a resistor R26, the capacitor C11 is electrically connected to the resistor R26, the other end of the capacitor C11 is electrically connected to the anode of the diode D6, and the other end of the resistor R26 is electrically connected to the filter unit.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0051] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. An intermittent charging circuit for a high-voltage capacitor, characterized in that: It includes a first filtering and rectifying module, a first switching module, a power management module, a transformer, a switching tube Q2 and an output module; The first output end of the first filtering and rectifying module, the first switching module, and the power management module are electrically connected to the gate of the switching tube Q2 in sequence. The first end of the primary coil of the transformer is electrically connected to the second output end of the first filtering and rectifying module. The second end of the primary coil of the transformer is electrically connected to the drain of the switching tube Q2. The output end of the transformer is electrically connected to the output module. The source of the switching tube Q2 is grounded. The first filtering and rectifying module is used to rectify and filter the external AC power into DC power; The first switch module is used to control the power supply of the power management module to be turned on and off; The power management module outputs a PWM signal to the gate of the switch tube Q2 to control the on and off of the switch tube Q2; The PWM signal drives the switch tube Q2 to be turned on and off, so as to convert the direct current outputted from the second output terminal of the first filtering and rectifying module into an alternating voltage.

2. The intermittent charging circuit of a high-voltage capacitor according to claim 1, characterized in that: The first switching module includes a resistance unit, a switch unit and an enabling unit; the first output end of the first filtering and rectifying module is connected in series with the resistance unit and the switch unit, and the other end of the switch unit is electrically connected to one end of the power management module; the enabling unit is used to control the switching unit to be turned on and off.

3. The intermittent charging circuit of a high-voltage capacitor according to claim 2, characterized in that: The switch unit includes a capacitor C1, a resistor R1, a sensing transistor PC1, a voltage stabilizing diode D2, a voltage stabilizing diode D3 and a transistor Q1; One end of the capacitor C1 is electrically connected to the resistance unit, and the other end of the capacitor C1 is grounded. The voltage-stabilizing diode D3 is connected in parallel with the capacitor C1, the cathode of the voltage-stabilizing diode D3 is electrically connected to the resistance unit, and the anode of the voltage-stabilizing diode D3 is grounded. One end of the resistor R1 is electrically connected to the collector of the sensing transistor PC1, and the other end of the resistor R1 forms a first node with the resistance unit and the collector of the transistor Q1. The emitter of the sensing transistor PC1, the cathode of the voltage-stabilizing diode D2, and the base of the transistor Q1 are electrically connected, the anode of the voltage-stabilizing diode D2 is grounded, and the emitter of the transistor Q1 is electrically connected to the power management module. The enabling unit is used to control the conduction and shutdown of the sensing transistor PC1.

4. The intermittent charging circuit for a high-voltage capacitor according to claim 3, characterized in that: The enabling unit includes a resistor R25 and a light emitting diode PC2 . One end of the resistor R25 is electrically connected to the enabling end, the other end of the resistor R25 is electrically connected to the anode of the diode PC2 , and the cathode of the diode PC2 is grounded.

5. The intermittent charging circuit for a high-voltage capacitor according to claim 3, characterized in that: The power management module includes a power management chip U1 and a capacitor C6. The emitter of the transistor Q1, the VDD pin of the power management chip U1, and the capacitor C6 form a second node. The other end of the capacitor C6 is grounded. The GATE pin of the power management chip U1 is electrically connected to the gate of the switch tube Q2.

6. The intermittent charging circuit for a high-voltage capacitor according to claim 5, characterized in that: The gate of the switch tube Q2 is electrically connected to a resistor R20 , and the other end of the resistor R20 is electrically connected to the source of the switch tube Q2 .

7. The intermittent charging circuit for a high-voltage capacitor according to claim 5, characterized in that: The CS pin of the power management chip UI is electrically connected to a resistor R11, the resistor 11 is electrically connected to a resistor R23, one end of the resistor R23 forms a node with one end of the resistor 11 and the resistor 20, and the other end of the resistor R23 is grounded. The resistor R23 is electrically connected to a resistor R24, and the resistor R23 is connected in parallel with the resistor R24.

8. The intermittent charging circuit for a high-voltage capacitor according to claim 1, characterized in that: The output module includes a rectifier unit, a protection unit and a filter unit; the rectifier unit is electrically connected to the output end of the transformer, and the rectifier unit and the filter unit are connected in series; the rectifier unit is used to rectify the AC signal output from the output end of the transformer into DC power; the protection unit is used to absorb reverse voltage; and the filter unit is used to filter out clutter.

9. The intermittent charging circuit for a high-voltage capacitor according to claim 8, characterized in that: The rectifier unit includes a diode D6 , an anode of the diode D6 is electrically connected to the output end of the transformer, and a cathode of the diode D6 is electrically connected to the filter unit.

10. The intermittent charging circuit for a high-voltage capacitor according to claim 9, characterized in that: The protection unit includes a capacitor C11 and a resistor R26 . The capacitor C11 is electrically connected to the resistor R26 . The other end of the capacitor C11 is electrically connected to the anode of the diode D6 . The other end of the resistor R26 is electrically connected to the filter unit.

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