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Switch circuit, selection circuit, and voltage measurement device

A technology for switching circuits and power supply voltages, which is applied to measuring devices, measuring current/voltage, and testing electrical devices in transportation, etc., which can solve problems such as cost, deterioration of measurement accuracy, and increased power consumption.

Active Publication Date: 2014-01-01
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the switching element near the lowest position must pass a small current to generate the on-voltage, so the resistance element for generating the on-voltage of the drive circuit (for example, with Figure 19 and Figure 20 The resistance element equivalent to the resistance R) becomes high resistance, resulting in an increase in the area of ​​the voltage measuring device
[0033] The second problem is that the voltage measurement accuracy deteriorates due to the voltage drop caused by the resistance component of the switching element and the signal path, and the driving current of the switching element.
In addition, in order to implement this method with a voltage measuring device, a capacitor element with a large area has to be used, resulting in an increase in circuit scale
[0034] The third problem is that measurement accuracy deteriorates due to an unexpected current leakage path (leak path) occurring in the switching element in the off state
[0035] The fourth issue is the occurrence of measurement errors caused by devices due to the parasitic capacitance of switching elements and offset errors of OP amplifiers in the flying capacitor method voltage measuring device.
In either of Patent Document 5 and Patent Document 9, the processing for correcting errors is complicated, resulting in an increase in circuit scale.
In particular, when an OP amplifier is added as a buffer between the capacitor and the ADC in the flying capacitor circuit as in Patent Document 9, or a sample-and-hold circuit using the OP amplifier is used, the bias of the OP amplifier itself The main factor of the error is the setting voltage, etc.
There are various ways to correct this error, but it may take a lot of work and lead to increased measurement time and power consumption
[0036] In addition, none of the techniques disclosed in Patent Documents 10 to 12 can solve the above problems

Method used

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  • Switch circuit, selection circuit, and voltage measurement device
  • Switch circuit, selection circuit, and voltage measurement device
  • Switch circuit, selection circuit, and voltage measurement device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0152] figure 1 It is a block diagram showing an example of the voltage measuring device according to the first embodiment.

[0153]The voltage measurement device 2 shown in the figure is for each battery composed of one or more battery cells (VCL_1 to VCL_n) connected in series (in the case of collectively called battery cells, only indicated as VCL). A group of cells (hereinafter, also referred to as a “block”) measures the voltage across them. Here, as an example, the block described above is regarded as one battery cell. That is, the voltage measuring device 2 selects one battery cell at a time from the plurality of battery cells VCL connected in series to measure the voltage. In addition, the plurality of battery cells VCL connected in series is not limited to a battery cell row connected in series in a single row, but also includes a battery cell row in which a plurality of battery cell rows connected in series are connected in parallel. In addition, it also shows a ...

Embodiment approach 2

[0196] Figure 10 It is a circuit diagram showing another example of a switching circuit using a bidirectional switching element of a P-type MOS transistor. right with Figure 5 Components that are the same as those in the switching circuit are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0197] Figure 10 The switch circuit shown has a turn-off acceleration unit 407 controlled by an turn-off signal (OFF) corresponding to an enable signal (ENABLE) instead of the turn-off acceleration unit 403 in which a constant current I flows. The above-mentioned off-acceleration unit 407 is composed of the following parts: N-type MOS transistor MN7 inputting an off signal (OFF) at the gate terminal; a resistance element for adjusting the current value provided between the source terminal of MN7 and the GND terminal R3; a resistance element R4 that converts a current flowing in the MN7 into a voltage with reference to the power supply VCC; an...

Embodiment approach 3

[0202] Figure 12 It is a circuit diagram showing another example of a switching circuit using a bidirectional switching element of a P-type MOS transistor. right with Figure 5 and Figure 10 Components that are the same as those of the switching circuit are given the same reference numerals and will be omitted and described in detail.

[0203] Figure 12 The switch circuit shown has a turn-off acceleration unit 408 controlled by an turn-off signal (OFF) corresponding to an enable signal (ENABLE) instead of the turn-off acceleration unit 403 having a configuration in which a constant current I flows. The above-mentioned off-acceleration unit 408 is composed of the following parts: N-type MOS transistor MN8 and P-type MOS transistor MP9 constituting a logic circuit for inputting an off signal (OFF); The P-type MOS transistor MP8 that shares the gate terminal with the bidirectional switching element. The inverter circuit described above is driven between the power supply V...

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PUM

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Abstract

Provided is a technology that contributes to improving voltage measurement accuracy in voltage measurement devices, and to equalizing current consumption in batteries. Switch circuits (SWP, SWN) are provided with: switch elements (MP1 and MP2, MN1 and MN2) that are provided between input terminals and output terminals; and switch driving units (401 to 409) that are driven between the first power supply voltage (VCC or GND) and second power supply voltage (GND or VCC) having different phases, with the input voltage therebetween. The switch driving units comprise: source follower circuits (401, 404) in which a drain side is connected to a first power supply terminal to which a first power supply voltage is fed, and that input voltage according to the input voltage, and supply the voltage generated on the output side to the switch element as a drive voltage for driving the switch element; and current control units (402, 405) that open and close the current path between the output side of the source follower circuit and the second power supply terminal to which the second power supply voltage is supplied, according to the control signal (ENABLE).

Description

technical field [0001] The present invention relates to a switching circuit, a selection circuit, and a voltage measurement device, and particularly relates to an effective technology for a voltage measurement device that selects and measures one voltage from a plurality of voltages. Background technique [0002] Currently, electric vehicles (EV: electric vehicle) and hybrid electric vehicles (HEV: hybrid electric vehicle) that use electric motors as a driving source for vehicle travel are being researched and developed by many companies and groups regardless of automobile manufacturers. In order to drive these motors, a vehicle-mounted power supply having a high voltage of several hundred volts is required. The vehicle-mounted power supply described above can be realized by a battery pack in which a plurality of single cells (also referred to as “battery cells”) generating a voltage of about several volts are connected in series. [0003] In electric vehicles, etc., it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00H03K17/687
CPCH03K17/6871G01R31/3658G01R31/362G01R31/396G01R31/007G01R31/3835H03K17/04H03K17/693
Inventor 牧野良成早川博彦
Owner RENESAS ELECTRONICS CORP
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