High-precision high-voltage voltage-regulating charging circuit

Abstract

The application relates to a high-precision high-voltage voltage-regulating charging circuit, which comprises a phase angle acquisition module, a switching module and a high-voltage transformer connected in sequence, the switching module comprises a first optocoupler, one end of a first current-limiting resistor is connected with the first optocoupler, the other end of the first current-limiting resistor is connected with the phase angle acquisition module, the first optocoupler is connected with the base of a first triode, the base of a second triode and a first power supply voltage, the collector of the first triode is connected with a second power supply voltage, the emitter of the first triode is connected with one end of a second current-limiting resistor and the emitter of the second triode, the other end of the second current-limiting resistor is connected with the gate of a mos tube, the source of the mos tube is connected with the positive pole of an input voltage, the drain of the mos tube is connected with the collector of the second triode, and the first transformer is connected with a charging resistor, a first diode and a charging capacitor. Compared with the prior art, the application adopts voltage regulation in the rear stage, and the voltage regulation precision is improved compared with voltage regulation in the front stage through a voltage regulator.

Description

TECHNICAL FIELD

[0001] The present application relates to transformer, especially to a high-precision high-voltage regulating charging circuit. BACKGROUND

[0002] The existing common linear charging method is to adjust the voltage through a voltage regulator, then connect a high-voltage transformer, and charge the required capacitor through rectification. This method not only occupies a large space, but also has a minimum step voltage limited by the mechanical voltage regulator. With the development trend of miniaturization and high precision of some test equipment, the high-voltage module needs to be improved and upgraded.

[0003] The principle of the existing high-voltage power supply is shown in Figure 2

[0004] The deficiencies of the existing linear high-voltage power supply module are as follows:

[0005] 1: The front stage is adjusted by a voltage regulator, and the minimum voltage step is about 220V / 240=0.91V. Assuming that the transformer in the rear stage is 100 times, the minimum step is 128.6V, and the regulating precision is poor.

[0006] 2: Because the voltage regulator is used for voltage regulation, the volume of the voltage regulator and the high-voltage transformer will be very large when the charging power is considered. Assuming that the power is 2000W, the volume of the voltage regulator and the high-voltage transformer will be very large. SUMMARY

[0007] The purpose of the present application is to overcome the defects of the prior art and provide a high-precision high-voltage regulating charging circuit. The present application has high regulating precision and small transformer volume.

[0008] The purpose of the present application can be achieved by the following technical solutions:

[0009] ​The application discloses a high-precision high-voltage voltage-regulating charging circuit, which comprises a phase angle acquisition module, a switch module and a high-voltage transformer connected in sequence, wherein the high-voltage transformer comprises an input voltage, a dummy load resistor and a first transformer; the switch module comprises a first optocoupler; one end of the first optocoupler is connected with one end of a first current-limiting resistor; the other end of the first current-limiting resistor is connected with the phase angle acquisition module; the light-receiving end of the first optocoupler is connected with the base of a first triode, the base of a second triode and a first power supply voltage; the first triode is an NPN triode; the second triode is a PNP triode; the base of the first triode is connected with a protection resistor; the protection resistor is grounded; the collector of the first triode is connected with a second power supply voltage; the emitter of the first triode is connected with one end of a second current-limiting resistor and the emitter of the second triode; the other end of the second current-limiting resistor is connected with the gate of a MOS transistor; the source of the MOS transistor is connected with the positive pole of the input voltage; the drain of the MOS transistor is connected with the collector of the second triode; the dummy load resistor is connected between the drain of the MOS transistor and the negative pole of the input voltage; the dummy load resistor is connected with the first transformer in parallel; the first transformer is connected with a charging resistor, a first diode and a charging capacitor.

[0010] The phase angle acquisition module comprises a second transformer connected with the input voltage; the second transformer is connected with a third current-limiting resistor and connected with the two ends of a second diode and a third diode in reverse parallel; one end of the diode in reverse parallel is connected with the positive input end of a comparator; the other end of the diode in reverse parallel is connected with the negative input end of the comparator; the output end of the comparator is connected with one end of a fourth current-limiting resistor; the other end of the fourth current-limiting resistor is connected with the light-emitting end of a second optocoupler; the light-receiving end of the second optocoupler is connected with one end of a recognition resistor; one end of the recognition resistor is connected with the first input end of a CPU main control module; the output end of the CPU main control module is connected with the first current-limiting resistor; the other end of the recognition resistor is connected with a third power supply voltage.

[0011] Further, the light-emitting end of the first optocoupler is a light-emitting diode; one end of the light-emitting diode is connected with one end of the first current-limiting resistor; the cathode of the light-emitting diode is grounded.

[0012] Further, the light-receiving end of the first optocoupler is a photoresistor; one end of the photoresistor is connected with the first power supply voltage; the other end of the photoresistor is connected with the base of the first triode and the base of the second triode.

[0013] Further, the light-emitting end of the second optocoupler is a light-emitting diode; one end of the light-emitting diode is connected with the other end of the fourth current-limiting resistor; the cathode of the light-emitting diode is grounded.

[0014] Further, the light-receiving end of the second optocoupler is a photoresistor; one end of the photoresistor is connected with one end of the recognition resistor; the other end of the photoresistor is grounded.

[0015] Further, the input voltage is 220V.

[0016] Further, the CPU master module comprises a single-chip microcomputer, the first input end of the CPU master module is an input end of the single-chip microcomputer, and the output end of the CPU master module is an output end of the single-chip microcomputer.

[0017] Further, the second input end of the CPU master module is connected with the output end of the touch screen control module.

[0018] Further, the mos tube is an N-channel mos tube.

[0019] Further, one end of the charging resistor is connected with the first transformer, the other end of the charging resistor is connected with the anode of the first diode, and the cathode of the first diode is connected with the charging capacitor.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] (1) By setting the phase angle acquisition module, the switch module and the high-voltage transformer, the signal output by the phase angle acquisition module controls the on-off of the triode and the mos tube of the switch module, and the required voltage is output, thereby improving the precision of voltage regulation, and the precision of voltage regulation can be doubled compared with the existing voltage regulator mode.

[0022] (2) The present application adopts the phase angle acquisition module to realize the acquisition of analog quantity, and compared with the existing several-kilowatt voltage regulator, the phase angle acquisition module can be integrated on a PCB board, thereby reducing the volume. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the main circuit structure diagram of the present application;

[0024] Figure 2 It is the existing graph transformer charging principle diagram;

[0025] Figure 3 It is the phase angle acquisition module circuit diagram of the present application;

[0026] Figure 4 It is the connection structure diagram of each module of the present application;

[0027] In the figure, R1 is a first current-limiting resistor, R2 is a second current-limiting resistor, R3 is a third current-limiting resistor, R4 is a dummy load resistor, R5 is a charging resistor, R6 is a fourth current-limiting resistor, R7 is a recognition resistor, R8 is a protection resistor, Q1 is a first triode, Q2 is a second triode, Q3 is a mos tube, U1 is a first optocoupler, U2 is a comparator, and U3 is a second optocoupler. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings of the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0030] Embodiment 1

[0031] The present application provides a high-precision high-voltage voltage-regulating charging circuit. The main circuit diagram of the circuit is shown in Figure 1 The circuit includes a phase angle acquisition module, a switch module and a high-voltage transformer connected in sequence.

[0032] The high-voltage transformer includes an input voltage, a dummy load resistor R4 and a first transformer T1. The switch module includes a first optocoupler U1, one end of the first optocoupler U1 is connected to one end of a first current-limiting resistor R1, the other end of the first current-limiting resistor R1 is connected to the phase angle acquisition module, the light receiver end of the first optocoupler U1 is connected to the base of a first triode Q1, the base of a second triode Q2 and a first power supply voltage, the first triode Q1 is an NPN triode, the second triode Q2 is a PNP triode, the base of the first triode Q1 is connected to a protection resistor R8, the protection resistor R8 is grounded, the collector of the first triode Q1 is connected to a second power supply voltage, the emitter of the first triode Q1 is connected to one end of a second current-limiting resistor R2 and the emitter of the second triode Q2, the other end of the second current-limiting resistor R2 is connected to the gate of a mos tube Q3, the source of the mos tube Q3 is connected to the positive pole of the input voltage, the drain of the mos tube Q3 is connected to the collector of the second triode Q2, the dummy load resistor R4 is connected between the drain of the mos tube Q3 and the negative pole of the input voltage, the dummy load resistor R4 is connected in parallel with the first transformer T1, the first transformer T1 is connected to a charging resistor R5, a first diode D1 and a charging capacitor C1. The mos tube Q3 is an N-channel mos tube.

[0033] The circuit diagram of the phase angle acquisition module is shown in Figure 3The phase angle acquisition module includes a second transformer T2 connected to the input voltage, the second transformer T2 is connected to a third current-limiting resistor R3, and is connected to both ends of a second diode D2 and a third diode D3 connected in anti-parallel, one end of the diode connected in anti-parallel is connected to a positive input end of a comparator U2, the other end of the diode connected in anti-parallel is connected to a negative input end of the comparator U2, an output end of the comparator U2 is connected to one end of a fourth current-limiting resistor R6, the other end of the fourth current-limiting resistor R6 is connected to a light emitter of a second optocoupler U3, a light receiver of the second optocoupler U3 is connected to one end of a discrimination resistor R7, one end of the discrimination resistor R7 is connected to a first input end of a CPU main control module, an output end of the CPU main control module is connected to a first current-limiting resistor R1, and the other end of the discrimination resistor R7 is connected to a third power supply voltage.

[0034] The light emitter of the first optocoupler U1 is a light emitting diode, one end of the light emitting diode is connected to the first current-limiting resistor R1, and the other end of the light emitting diode is grounded.

[0035] The light receiver of the first optocoupler U1 is a photoresistor, one end of the photoresistor is connected to a first power supply voltage, and the other end of the photoresistor is connected to a base of a first triode Q1 and a base of a second triode Q2.

[0036] The light emitter of the second optocoupler U3 is a light emitting diode, one end of the light emitting diode is connected to the other end of the fourth current-limiting resistor R6, and the other end of the light emitting diode is grounded.

[0037] The light receiver of the second optocoupler U3 is a photoresistor, one end of the photoresistor is connected to one end of the discrimination resistor R7, and the other end of the photoresistor is grounded.

[0038] The input voltage is 220V.

[0039] The CPU main control module includes a single-chip microcomputer, the first input end of the CPU main control module is an input end of the single-chip microcomputer, and the output end of the CPU main control module is an output end of the single-chip microcomputer.

[0040] The second input end of the CPU main control module is connected to an output end of the touch screen control module.

[0041] One end of the charging resistor R5 is connected to the first transformer T1, the other end of the charging resistor R5 is connected to an anode of a first diode D1, and a cathode of the first diode D1 is connected to a charging capacitor C1.

[0042] In the application, the first current-limiting resistor R1, the second current-limiting resistor R2, the third current-limiting resistor R3 and the fourth current-limiting resistor R6 are used for current limiting and protection of diodes. The dummy load resistor R4 is used as a dummy load to accelerate the turn-off of the mos tube Q3, and is used as a discharge resistor of the first transformer T1 to ensure safety during power-off. The charging resistor R5 is used for adjusting the charging parameters. The identification resistor R7 is used to ensure that the square wave output by the second optocoupler U3 can be identified by the single-chip microcomputer. The protection resistor R8 is a pull-down resistor for the first triode Q1 and the second triode Q2, and is used for protection of the triodes. The emitter of the second triode Q2 in the application is connected to the emitter of the first triode Q1, and the second triode Q2 can be quickly turned off. The working voltage of the comparator U2 in the application is ±12V. The third power supply voltage is less than the working voltage of the comparator U2, and the third power supply voltage can be 5V. Through the identification resistor R7 and the third power supply voltage, the square wave of 0-5V output by the second optocoupler U3 can be identified by the single-chip microcomputer.

[0043] The connection structure diagram of each module of the application is shown in Figure 4

[0044] The working process of the application is as follows:

[0045] The CPU master control module receives the target voltage output by the touch screen control module. The CPU master control module calculates the conduction angle corresponding to the alternating current according to the target voltage, and controls the conduction angle of the phase angle acquisition module. The phase angle acquisition module acquires the input voltage AC. After the input voltage AC is reduced in voltage by the first transformer T1, it is reduced to within 0.7V by two diodes D2 and D3 connected in reverse parallel, and a high-low square wave is output by a comparator U2. The output of the comparator U2 is connected to a second optocoupler U3 for square wave isolation, and the identifiable square wave output by the second optocoupler U3 is transmitted to a single-chip microcomputer for acquisition of the phase angle. After the single-chip microcomputer completes the acquisition of the phase angle, a control signal TTL is sent to the switch module according to the calculation result. The acquired phase angle is divided into within the conduction angle and not within the conduction angle. When within the conduction angle, the first optocoupler U1 is actuated, the first triode Q1 is turned on, the second triode Q2 is turned off, and the first triode Q1 is turned on to drive the mos tube Q3 to be turned on. At this time, the input voltage AC can be input to the high-voltage transformer in the rear stage, and the input voltage AC is charged to the charging capacitor C1 through the first transformer T1, the charging resistor R5 and the first diode D1. When not within the conduction angle, the first optocoupler U1 is turned off, the first triode Q1 is turned off, the second triode Q2 is turned on, and the second triode Q2 is turned on to accelerate the turn-off of the mos tube Q3. After the mos tube Q3 is turned off, the input voltage AC is disconnected, and the charging of the charging capacitor C1 is stopped. Through switching within the conduction angle and not within the conduction angle, the voltage of the charging capacitor C1 eventually reaches the target voltage.

[0046] ​The preferred embodiments of the present application have been described above in detail. It should be understood that modifications and variations to the preferred embodiments could be made by those skilled in the art in light of the teachings above without departing from the spirit of the present application. It is therefore to be understood that what is desired to be protected by letters patent is defined by the scope of the claims that follow and that on behalf of which the summary of the application is intended to serve.

Claims

1. A high-precision high-voltage voltage-regulated charging circuit, characterized by comprising: The circuit comprises a phase angle acquisition module, a switch module and a high-voltage transformer connected in sequence, the high-voltage transformer comprises an input voltage, a dummy load resistor (R4) and a first transformer (T1), the switch module comprises a first optocoupler (U1), one end of the first current-limiting resistor (R1) is connected to the light emitter of the first optocoupler (U1), the other end of the first current-limiting resistor (R1) is connected to the phase angle acquisition module, the light receiver of the first optocoupler (U1) is connected to the base of the first transistor (Q1), the base of the second transistor (Q2) and the first power supply voltage, the first transistor (Q1) is an NPN transistor, the second transistor (Q2) is a PNP transistor, the base of the first transistor (Q1) is connected to a protection resistor (R8), the protection resistor (R8) is grounded, the collector of the first transistor (Q1) is connected to a second power supply voltage, the emitter of the first transistor (Q1) is connected to one end of a second current-limiting resistor (R2) and the emitter of the second transistor (Q2), the other end of the second current-limiting resistor (R2) is connected to the gate of a mos transistor (Q3), the source of the mos transistor (Q3) is connected to the positive pole of the input voltage, the drain of the mos transistor (Q3) is connected to the collector of the second transistor (Q2), the dummy load resistor (R4) is connected between the drain of the mos transistor (Q3) and the negative pole of the input voltage, the dummy load resistor (R4) is connected in parallel with the first transformer (T1) at both ends, and the first transformer (T1) is connected to a charging resistor (R5), a first diode (D1) and a charging capacitor (C1); The phase angle acquisition module comprises a second transformer (T2) connected to the input voltage, the second transformer (T2) is connected to a third current-limiting resistor (R3), and the two ends of the second transformer (T2) are connected to a second diode (D2) and a third diode (D3) connected in anti-parallel, one end of the diode connected in anti-parallel is connected to the positive input end of a comparator (U2), the other end of the diode connected in anti-parallel is connected to the negative input end of the comparator (U2), one end of a fourth current-limiting resistor (R6) is connected to the output end of the comparator (U2), the other end of the fourth current-limiting resistor (R6) is connected to the light emitter of a second optocoupler (U3), one end of a recognition resistor (R7) is connected to the light receiver of the second optocoupler (U3), one end of the recognition resistor (R7) is connected to the first input end of a CPU main control module, the output end of the CPU main control module is connected to the first current-limiting resistor (R1), and the other end of the recognition resistor (R7) is connected to a third power supply voltage.

2. The high-precision high-voltage voltage-regulating charging circuit according to claim 1, characterized in that, The light emitter of the first optocoupler (U1) is a light-emitting diode, one end of the first current-limiting resistor (R1) is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is grounded.

3. The high-precision high-voltage voltage-regulating charging circuit according to claim 1, characterized in that, The light receiver of the first optocoupler (U1) is a photoresistor, one end of the photoresistor is connected to the first power supply voltage, and the other end of the photoresistor is connected to the base of the first transistor (Q1) and the base of the second transistor (Q2).

4. The high-precision high-voltage voltage-regulating charging circuit according to claim 1, characterized in that, The light emitter of the second optocoupler (U3) is a light-emitting diode, the anode of the light-emitting diode is connected to the other end of the fourth current-limiting resistor (R6), and the cathode of the light-emitting diode is grounded.

5. The high-precision high-voltage voltage-regulated charging circuit according to claim 1, characterized in that, The light receiver of the second light coupling (U3) is a photoresistor, one end of the photoresistor is connected with one end of a recognition resistor (R7), and the other end of the photoresistor is grounded.

6. The high-precision high-voltage voltage-regulated charging circuit according to claim 1, characterized in that The input voltage is 220V.

7. The high-precision high-voltage voltage-regulated charging circuit according to claim 1, characterized in that, The CPU main control module comprises a single-chip microcomputer, the first input end of the CPU main control module is an input end of the single-chip microcomputer, and the output end of the CPU main control module is an output end of the single-chip microcomputer.

8. The high-precision high-voltage voltage-regulated charging circuit according to claim 1, characterized in that The second input end of the CPU main control module is connected with the output end of the touch screen control module.

9. The high-precision high-voltage voltage-regulated charging circuit according to claim 1, characterized in that The mos tube (Q3) is an N-channel mos tube.

10. The high-precision high-voltage regulated charging circuit according to claim 1, wherein, One end of a charging resistor (R5) is connected with the first transformer (T1), the other end of the charging resistor (R5) is connected with the anode of the first diode (D1), and the cathode of the first diode (D1) is connected with the charging capacitor (C1).

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